CN-117904912-B - Highway super-hydrophobic soft rock high-performance roadbed structure and construction method

CN117904912BCN 117904912 BCN117904912 BCN 117904912BCN-117904912-B

Abstract

The invention belongs to the technical field of highway construction, and particularly relates to a super-hydrophobic soft rock high-performance roadbed structure of an expressway and a construction method. The soft rock filling core comprises a foundation, a bottom water-proof area is paved on the foundation, soft rock filling core areas are paved on the bottom water-proof area, super-hydrophobic soft rock edge-covering hydrophobic areas are arranged on two sides of the soft rock filling core areas, super-hydrophobic soft rock cover hydrophobic areas are paved on the soft rock filling core areas, a rigidity constant area is paved on the soft rock super-hydrophobic cover areas, a pavement structure layer is paved on the rigidity constant area, a slope surface is jointly formed by the bottom water-proof area, the super-hydrophobic soft rock edge-covering hydrophobic areas, the super-hydrophobic soft rock cover hydrophobic areas and the outer side faces of the rigidity constant area, and a slope surface protection area is paved on the slope surface. The roadbed structure has the advantages of good stability, stable rigidity and small settlement after construction, and can avoid cracking, settlement and the like of the soft rock roadbed, prolong the service life of the roadbed pavement and improve the travelling comfort of the pavement.

Inventors

SONG CHANGJUN
SUN YANFEI
LIU JIANGXIN
WANG GUHONG
PENG BO
HAN ZHIJIE
LIU ZHENGRONG
WU LIJIAN
SONG YONGSHENG
LIU WENJIE
YANG FEI
BIAN XIAOLIN
CHAO WANLI
LI PENG

Assignees

交通运输部公路科学研究所
湖南省衡永高速公路建设开发有限公司
湖南省交通科学研究院有限公司
疏科纳米疏水科技(嘉兴)有限公司

Dates

Publication Date: 20260512
Application Date: 20240117

Claims (9)

1. The highway super-hydrophobic soft rock high-performance roadbed structure is characterized by comprising a foundation, wherein a bottom water isolation area is paved above the foundation, a soft rock filling area is paved above the bottom water isolation area, super-hydrophobic soft rock edging hydrophobic areas are arranged on two sides of the soft rock filling area, a super-hydrophobic soft rock sealing cover hydrophobic area is paved above the soft rock filling area, a rigidity constant area is paved above the super-hydrophobic soft rock sealing cover hydrophobic area, a pavement structure layer is paved above the rigidity constant area, and the bottom water isolation area, the super-hydrophobic soft rock edging hydrophobic area and the outer side face of the super-hydrophobic soft rock sealing cover hydrophobic area jointly form a slope surface, and a slope surface protection area is paved on the slope surface; The roadbed drainage system comprises a slope rapid trough, a platform intercepting trough and a slope foot drainage ditch, wherein the platform intercepting trough and the slope rapid trough are arranged on a slope surface, the slope foot drainage ditch is arranged on a foundation close to the slope foot of the slope surface of the slope, the platform intercepting trough and the slope foot drainage ditch are communicated with the slope rapid trough, and the top end of the slope rapid trough is communicated with a water outlet of the road surface drainage system; The filler of the bottom water-proof area is hard rock, stone slag or broken stone of medium hard rock, the thickness of the bottom water-proof area is not less than 50cm, and the maximum particle size of the stone in the bottom water-proof area is not more than 2/3 of the layer thickness; The soft rock core filling area is filled with soft rock, the soft rock comprises softer rock, soft rock and extremely soft rock, the paving layer thickness of an upper embankment of the soft rock core filling area is not more than 30cm, the paving layer thickness of a lower embankment of the soft rock core filling area is not more than 40cm, and the maximum particle size of the filling material of the soft rock core filling area is smaller than the layer thickness; The filler of the super-hydrophobic soft rock edging hydrophobic region is super-hydrophobic soft rock, the paving layer thickness of the upper embankment of the super-hydrophobic soft rock edging hydrophobic region is not more than 30cm, the paving layer thickness of the lower embankment of the super-hydrophobic soft rock edging hydrophobic region is not more than 40cm, and the maximum particle size of the filler of the super-hydrophobic soft rock edging hydrophobic region is not more than 10cm; The filler of the super-hydrophobic soft rock cover hydrophobic region is super-hydrophobic soft rock, the thickness of the super-hydrophobic soft rock cover hydrophobic region is not less than 30cm, and the maximum particle size of the filler of the super-hydrophobic soft rock cover hydrophobic region is not more than 10cm; the super-hydrophobic soft rock is soft rock permeated with super-hydrophobic solution; the filler of the rigidity constant area is hard rock or medium hard rock, the thickness of the rigidity constant area is not less than 80cm, the paving layer thickness of the rigidity constant area is not more than 30cm, and the maximum particle size of the filler of the rigidity constant area is less than 10cm.
2. The highway super-hydrophobic soft rock high-performance roadbed structure according to claim 1, wherein the slope protection area adopts a framework grass planting structure, the framework of the framework grass planting structure adopts an arched concrete framework, a water blocking belt and a drainage groove are arranged on the arched concrete framework, and the minimum soil covering layer thickness of the slope protection area is not less than 15cm.
3. The construction method of the super-hydrophobic soft rock high-performance roadbed structure of the expressway according to any one of claims 1 to 2, which is characterized by comprising the following steps: s1, construction preparation, including construction measurement, test, foundation treatment and construction of a test road section; s2, compacting before filling and detecting compactness of the foundation surface layer; s3, constructing a bottom water isolation area; S4, controlling the loose paving thickness in a manner of arranging square grids, inserting rods and hanging wires, and synchronously feeding, paving, leveling and crushing the ultra-grain-size lump stones in the core filling area of the first layer of soft rock and the edge-covering and water-repellent area of the ultra-hydrophobic soft rock; S5, calculating the amount of the super-hydrophobic emulsion and water to be mixed in the first layer super-hydrophobic soft rock-covered hydrophobic region according to the soft rock amount of the first layer super-hydrophobic soft rock-covered hydrophobic region and the optimal mixing ratio and the optimal water-emulsion ratio determined by the test in the step S1; s6, diluting and mixing the super-hydrophobic emulsion and water in the step S5 according to the super-hydrophobic solution preparation process determined by the test section in the step S1, and preparing the super-hydrophobic solution required by the first layer of super-hydrophobic soft rock edge-covering hydrophobic area; s7, spraying the super-hydrophobic emulsion in the range of the first layer super-hydrophobic soft rock edge-covering hydrophobic area, mixing the emulsion with the soft rock and carrying out the construction of the turning-on and the turning-off and the drying according to the technological parameters of the super-hydrophobic solution spraying, the mixing of the solution and the soft rock and the turning-on and the drying determined in the test section in the step S1; S8, carrying out rough leveling construction on the first layer of super-hydrophobic soft rock edge-covering hydrophobic area; S9, performing fine leveling construction on the first layer of super-hydrophobic soft rock edge-covering hydrophobic area and the first layer of soft rock core-filling area synchronously; S10, synchronously compacting construction of the first layer of super-hydrophobic soft rock edge-covering hydrophobic area and the first layer of soft rock core-filling area according to compaction process parameters determined by the test section in the step S1; s11, synchronously detecting compaction quality of the first layer of super-hydrophobic soft rock edge-covering hydrophobic area and the first layer of soft rock core-filling area according to the compaction quality detection method, indexes and standards determined by the test section in the step S1, wherein the compaction quality is qualified, and the construction of the first layer of super-hydrophobic soft rock edge-covering hydrophobic area and the first layer of soft rock core-filling area is completed; s12, sequentially repeating the construction steps from S4 to S11, and constructing other layers until the layers are filled to the top surface elevation of the soft rock core filling area; S13, referring to the step S4, feeding, paving, leveling and crushing the super-hydrophobic soft rock cover hydrophobic area, referring to the method in the step S5, calculating the amount of the super-hydrophobic emulsion and water to be mixed, referring to the method in the step S6, preparing the super-hydrophobic solution, referring to the method in the step S7, spraying the super-hydrophobic solution, mixing the solution with soft rock, turning over and airing, referring to the methods in the steps S8 to S11, and carrying out rough leveling, fine leveling, rolling and quality detection construction of the first layer super-hydrophobic soft rock cover hydrophobic area; S14, constructing the rest layers of the hydrophobic area of the super-hydrophobic soft rock cover according to the method of the step S13 until filling is carried out to the top surface elevation of the hydrophobic area of the super-hydrophobic soft rock cover; s15, loading, paving, leveling, rolling and quality detection construction are carried out in the rigidity constant area until the height of the top surface of the roadbed is filled; s16, constructing a slope protection area and a slope rapid trough; S17, performing roadbed renovation and intersection acceptance; s18, after the road bed intersection is qualified, constructing a road surface structural layer.
4. The construction method of the super-hydrophobic soft rock high-performance roadbed structure of the expressway according to claim 3, wherein the test in the step S1 is a sampling test of the roadbed foundation soil, soft rock to be used as roadbed filler, medium hard rock and slag or broken stone of the hard rock before roadbed construction; the test soil sample comprises roadbed base undisturbed soil, soft rock, super-hydrophobic soft rock, medium hard rock and rock slag or broken stone of hard rock; The test items of the foundation bed undisturbed soil comprise a natural water content test, a liquid limit test, a plastic limit test, a particle analysis test and a compaction test, and the engineering classification and the characteristics of the foundation bed undisturbed soil are defined; The test items of the soft rock comprise a natural water content test, a liquid limit test, a plastic limit test, a particle analysis test, a compaction test, a CBR test and a saturated uniaxial compressive strength test, and the road characteristics, classification and application range of the soft rock are defined; the test items of the super-hydrophobic soft rock comprise a compaction test, a CBR test, a super-hydrophobic test and a water resistance test, the road characteristics of the super-hydrophobic soft rock are defined, and the optimal blending ratio of the super-hydrophobic soft rock and the optimal water-emulsion ratio of the super-hydrophobic solution are provided; The test items of the hard rock and the slag or broken stone of the hard rock comprise compaction test, CBR test and saturated uniaxial compressive strength test, and the road characteristics and the application range of the slag or broken stone are clear.
5. The construction method of the highway super-hydrophobic soft rock high-performance roadbed structure according to claim 3, wherein 4% of drainage transverse slopes are arranged on the top surface of the super-hydrophobic soft rock cover hydrophobic area in the step S14.
6. The construction method of the highway super-hydrophobic soft rock high-performance roadbed structure according to claim 3 is characterized in that the permeability coefficient of the super-hydrophobic soft rock edge-covering hydrophobic area and the super-hydrophobic soft rock cover hydrophobic area is less than or equal to 10ml/min, the super-hydrophobic performance detection method of the super-hydrophobic soft rock edge-covering hydrophobic area and the super-hydrophobic soft rock cover hydrophobic area adopts a visual inspection method, water splashing is carried out after a super-hydrophobic soft rock compaction layer is dried, whether lotus leaf effect is formed or not is visually inspected, the water absorption rates of the super-hydrophobic soft rock edge-covering hydrophobic area and the super-hydrophobic soft rock cover hydrophobic area are sampled on site, a part and a bubble water test are carried out, the water absorption rate is less than or equal to 2%, and the water absorption rate calculation formula of the test piece is as follows: Wherein, w is the water absorption (%) of the test piece, m 1 is the combined mass (g) of the test tube and the test piece after soaking, m 2 is the combined mass (g) of the test tube and the test piece, and m is the mass (g) of the test tube.
7. The construction method of the highway super-hydrophobic soft rock high-performance roadbed structure according to claim 4, wherein the specific steps of the compaction test of the super-hydrophobic soft rock are as follows: A1, preparing test soil, namely crushing soft rock, sieving with a 40mm round hole sieve, taking the sample dosage of a compaction test, drying by adopting a drying method, and weighing the weight of dry soil; a2, preparing a superhydrophobic solution, namely diluting the superhydrophobic emulsion according to water-emulsion ratios of 1:4, 1:6, 1:8 and 1:10 respectively to prepare the superhydrophobic solution; A3, preparing samples according to a quarter method, preparing at least 5 samples for each water-emulsion ratio super-hydrophobic solution, respectively adding the super-hydrophobic solution according to a principle of increasing 1% -3%, uniformly mixing soil samples, and sealing the choke plug for one day and night; A4, performing the product and the test according to the related requirements of the compaction test; a5, finishing data, namely obtaining the optimal water content and the maximum dry density of different super-hydrophobic solution pairs; the specific steps of the CBR test of the super-hydrophobic soft rock are as follows: B1, preparing test soil, namely crushing soft rock, sieving with a round hole sieve with 20mm, sieving the sample dosage of a CBR test, drying by adopting a drying method, and weighing the weight of dry soil; B2, preparing a superhydrophobic solution, namely diluting the superhydrophobic emulsion according to the water-emulsion ratios of 1:4, 1:6, 1:8 and 1:10 respectively to prepare the superhydrophobic solution; preparing a sample according to a quartering method, adding the super-hydrophobic solution of each water-emulsion ratio into the weighed and dried soil sample according to the standards of the optimal water content of +2%, the optimal water content of +4% and the optimal water content of +6%, uniformly mixing the soil sample, and sealing the soil sample for four days and nights for later use; And B4, carrying out smoldering drying treatment, namely carrying out natural airing or drying treatment in a 50 ℃ oven on the smoldering soil sample after the smoldering is finished, carrying out water content treatment to the optimal water content, and carrying out surface drying; b5, performing the work-piece and test according to the related requirements of the CBR test; b6, finishing data, namely obtaining the bearing ratio and the expansion rate of different super-hydrophobic solution pairs; the specific steps of the superhydrophobic test of the superhydrophobic soft rock are as follows: crushing soft rock, sieving with a round hole sieve of 20mm, taking the sample dosage of a CBR test, drying by adopting a drying method, and weighing the weight of dry soil; Preparing a superhydrophobic solution, namely diluting the superhydrophobic emulsion according to the water-emulsion ratios of 1:4, 1:6, 1:8 and 1:10 respectively to prepare the superhydrophobic solution; Preparing a sample according to a quartering method, adding the superhydrophobic solution of each water-emulsion ratio into the weighed and dried soil sample according to the standards of the optimal water content of +2%, the optimal water content of +4% and the optimal water content of +6%, uniformly mixing the soil sample, and sealing the mixture for four days and nights for later use; C4, carrying out smoldering drying treatment, namely carrying out natural airing or drying treatment in a 50 ℃ oven on the smoldering soil sample after the smoldering is finished, carrying out water content treatment to the optimal water content, and carrying out surface drying; carrying out the product according to the related requirements of the bearing ratio test, and carrying out demoulding after the product is manufactured; C6, performing a dripping superhydrophobic test, namely dripping water on the upper end face, the lower end face and the side face of the test piece, and visually observing the superhydrophobic effect of the test piece; The water resistance of the super-hydrophobic soft rock is characterized by decay conditions of uniaxial compressive strength before and after soaking, and the specific steps of the uniaxial compressive strength test are as follows: Preparing a test piece for a test, namely preparing a soft rock cylinder sample by adopting a dry method, wherein the size of the cylinder sample is phi 50mm multiplied by 100mm, and drying in an oven; D2, preparing a superhydrophobic solution, namely diluting the superhydrophobic emulsion according to the water-emulsion ratios of 1:4, 1:6, 1:8 and 1:10 respectively to prepare the superhydrophobic solution; D3, soaking the test piece, namely respectively putting the test piece into super-hydrophobic solutions with different water-emulsion ratios, and then taking out, sealing and soaking the test piece for standby; D4, drying the test piece, namely naturally airing or drying the test piece in a 50 ℃ oven until the surface of the test piece is dried after the sealing piece is finished; Soaking the test piece in water, namely soaking the dried test piece in water for four days, and visually observing the superhydrophobic and disintegration conditions of the test piece; D6, testing, namely referring to relevant regulations of the uniaxial compressive strength test, and respectively testing the drying test piece in the D1 and the soaking test piece in the D5; d7, finishing data, namely analyzing the water resistance of the super-hydrophobic soft rock; the specific steps of the disintegration resistance test of the super-hydrophobic soft rock are as follows: e1, preparing test pieces, namely selecting a round block-shaped test piece with the mass of 40-60 g, wherein the number of each group of test pieces is not less than 10, and drying in an oven; e2, preparing a superhydrophobic solution, namely diluting the superhydrophobic emulsion according to the water-emulsion ratios of 1:4, 1:6, 1:8 and 1:10 respectively to prepare the superhydrophobic solution; E3, infiltrating the test piece, namely respectively putting the test piece into super-hydrophobic solutions with different water-emulsion ratios, and then taking out, sealing and infiltrating the test piece for standby; e4, starting the test, namely after the sealing part is finished, testing according to the test steps of the disintegration resistance test; and E5, finishing data, namely calculating the disintegration resistance index of the super-hydrophobic soft rock.
8. The construction method of the super-hydrophobic soft rock high-performance roadbed structure for expressways according to claim 3, wherein the high-performance roadbed is subjected to at least one complete rainy season or a natural settlement stabilization period of 6 months before the pavement structure layer is paved in step S18.
9. The construction method of the super-hydrophobic soft rock high-performance roadbed structure for expressways according to claim 3, wherein in the step S18, the pavement structure layer is paved after settlement is stabilized, and the average value of roadbed settlement rate of 3 months before the pavement structure layer begins to be paved is not more than 2 mm/month.

Description

Highway super-hydrophobic soft rock high-performance roadbed structure and construction method Technical Field The invention belongs to the technical field of highway construction, and particularly relates to a super-hydrophobic soft rock high-performance roadbed structure of an expressway and a construction method. Background The soft rock has the engineering characteristics of disintegration, softening and even mud formation when meeting water, rapid increase of deformation and rapid attenuation of strength, and is a poor roadbed filler. Currently, green highway construction is steadily advancing, and a highway subgrade filling method of 'few borrowers and zero abandons' is a necessary requirement. The soft rock is used as highway subgrade filler for large-scale utilization. In the practical engineering, the method of improving and treating the inorganic binder or sealing the cohesive soil is adopted to build the soft rock roadbed, so that a certain effect is obtained. But at the same time, the defects such as cracking, subsidence and the like of the soft rock roadbed pavement are more frequent than those of other roadbed fillers. The root causes of the problems are that the soft rock roadbed is large in sedimentation deformation and strong in attenuation, and water is a main cause of the soft rock roadbed is large in sedimentation deformation and strong in attenuation. Obviously, the technical problem of constructing the soft rock roadbed is not solved. The realization of stable humidity, stable rigidity and small post-construction settlement of the soft rock roadbed is a key of high-quality construction of the soft rock roadbed. Therefore, the super-hydrophobic soft rock high-performance roadbed structure of the expressway and the construction method are provided. Disclosure of Invention Aiming at the problems in the prior art, the invention discloses a highway super-hydrophobic soft rock high-performance roadbed structure and a construction method, and particularly discloses the following technical scheme: The utility model provides a highway super-hydrophobic soft rock high performance roadbed structure, includes the ground, the bottom water proof area has been laid to the top of ground, soft rock fills the core district has been laid to the top of bottom water proof area, soft rock fills the both sides of core district and is provided with super-hydrophobic soft rock and bordures the hydrophobic district, soft rock fills the top of core district and has laid super-hydrophobic soft rock closing cap hydrophobic district, super-hydrophobic soft rock closing cap hydrophobic district's top has laid the steady district of rigidity, road surface structural layer has been laid to the top of steady district of rigidity, bottom water proof district super-hydrophobic soft rock bordures the hydrophobic district of soft rock closing cap hydrophobic district and the lateral surface of steady district of rigidity jointly constitutes the slope, slope protection area has been laid on the slope. Still include road bed drainage system and road surface drainage system, road bed drainage system includes domatic chute, platform intercepting ditch, toe escape canal, the platform intercepting ditch with domatic chute all sets up on the slope of side slope, toe escape canal sets up on the ground that is close to the toe department of side slope face, the platform intercepting ditch with toe escape canal all with domatic chute intercommunication, the top of domatic chute communicates with the outlet of road surface drainage system. Further, the filler of the bottom water-proof area is hard rock, slag or broken stone of medium hard rock, the thickness of the bottom water-proof area is not less than 50cm, and the maximum grain size of the stone of the bottom water-proof area is not more than 2/3 of the layer thickness; The soft rock core filling area is filled with soft rock, the soft rock comprises softer rock, soft rock and extremely soft rock, the paving layer thickness of an upper embankment of the soft rock core filling area is not more than 30cm, the paving layer thickness of a lower embankment of the soft rock core filling area is not more than 40cm, and the maximum particle size of the filling material of the soft rock core filling area is smaller than the layer thickness; The filler of the super-hydrophobic soft rock edging hydrophobic region is super-hydrophobic soft rock, the paving layer thickness of the upper embankment of the super-hydrophobic soft rock edging hydrophobic region is not more than 30cm, the paving layer thickness of the lower embankment of the super-hydrophobic soft rock edging hydrophobic region is not more than 40cm, and the maximum particle size of the filler of the super-hydrophobic soft rock edging hydrophobic region is not more than 10cm; The filler of the super-hydrophobic soft rock cover hydrophobic region is super-hydrophobic soft rock, the thickness of the super-hydrophobic soft rock cover