CN-122010519-A - Modified material for repairing soil site diseases and repairing effect evaluation method thereof

CN122010519ACN 122010519 ACN122010519 ACN 122010519ACN-122010519-A

Abstract

The invention discloses a modified material for repairing soil-site diseases and a repairing effect evaluation method thereof, which relate to the technical field of soil-site repairing and comprise a silicon-calcium-based modified material based on metakaolin (A), calcium hydroxide (C) and micro silicon powder (S) and an optimal proportion thereof, wherein the feasibility of the silicon-calcium-based modified material in the soil-site diseases repairing is verified through a comprehensive engineering performance test, and the optimal proportion of ACS modified soil is finally obtained as follows: and C, S=1:2:4, and the addition of the ACS modified material can generate obvious volcanic ash reaction with the site soil, so that the anti-erosion performance and long-term durability of the original site soil are improved.

Inventors

ZHAO WEI
LIU YUAN
XIE HAO
XU JIANJIAN
JIAO LIN
ZHU CAIHUI
PENG SEN

Assignees

陕西省水利电力勘测设计研究院(集团)有限公司
西安理工大学

Dates

Publication Date: 20260512
Application Date: 20260129

Claims (10)

1. The modified material for repairing the soil site diseases is characterized by being silicon-calcium-based modified soil; the modified material comprises metakaolin, calcium hydroxide and micro silicon powder modified soil; The metakaolin comprises 44% Al 2 O 3 、52%SiO 2 ; in the modified material, the material mass ratio phi M1 of metakaolin A, calcium hydroxide modified soil C and micro silicon powder modified soil S is A: C: S=1:2:4; wherein, the mass ratio phi of the modified soil is defined as follows: ; wherein M 1 is the mass of the modified material, M 2 is the mass of plain soil, and when the modified material is more than 1, the mass ratio between the modified materials is represented as phi M1 .
2. The modified material for repairing the soil site diseases according to claim 1, wherein in the configuration process, the modified material is firstly mixed and stirred uniformly, then added into plain soil and stirred uniformly, and finally water with required quality is added; When modified soil with a certain water content is prepared, the preparation is carried out according to the following expression: ; ; Wherein m w is the mass of water required by the soil, m 0 is the mass of air-dried soil, omega 0 is the water content of the air-dried soil, omega ́ is the water content required by the soil sample, m is the mass of the soil required by the sample preparation, rho d is the dry density required during the sample preparation, and V is the volume of the sample preparation device.
3. The modified material for repairing an earthen site disease according to claim 2, wherein the weather resistance of the modified material is obtained by a performance test to obtain a test physical index; determining a risk weight coefficient of the physical index by adopting an analytic hierarchy process; Performing questionnaire investigation based on risk weight coefficients of physical indexes to determine final scoring conditions to obtain index weights, and further evaluating comprehensive performance; The physical indexes comprise capillary lifting height, disintegration rate under the action of still water soaking, degradation ratio under natural environment, degradation rate under natural environment, mass loss rate under the action of dynamic water erosion, compressive strength improvement coefficient and shear strength improvement coefficient.
4. The modified material for repairing an earthen site disease and the method for evaluating the repairing effect thereof according to claim 3, wherein the specific content of the risk weight coefficient of the physical index determined by using the analytic hierarchy process comprises the following steps: Based on the relation of the factors which are explicitly influenced by the test physical indexes, constructing a risk evaluation hierarchical analysis structure model; Pre-arranged elements The risk factors are analyzed according to the risk degree by referring to the importance scale table, and the influence of each factor of the same layer on the weather resistance index is compared in pairs to form a pair-to-pair judgment matrix ; Calculating importance weights of elements relative to criteria of the elements by using a single judgment matrix, adopting a square root method, and obtaining the maximum eigenvalue of the judgment matrix A after constructing the judgment matrix A ; And normalizing the feature vector W to obtain the importance weight of each factor.
5. The modified material for repairing an earthen site disease and the repairing effect evaluation method thereof according to claim 4, wherein the risk evaluation analytic hierarchy process model comprises a target layer, a criterion layer, an index layer and a state layer; The target layer is the weather resistance comprehensive index of the calcium silicate-based modified soil; The criterion layer is a physical index and a mechanical index; the index layer comprises: Capillary rise under physical index, disintegration rate under still water soaking, degradation ratio under natural environment, degradation rate under natural environment, mass loss rate under dynamic water erosion; compressive strength improvement coefficient and shear strength improvement coefficient under mechanical index; the state layer comprises a grade A, a grade B, a grade C and a grade D.
6. The modified material for repairing an earthen site disease and the method for evaluating the repairing effect thereof according to claim 5, wherein the expression of the judgment matrix is: ; In the matrix of the matrix, , 。
7. The modified material for repairing an earthen site disease and the method for evaluating the repairing effect thereof according to claim 6, wherein the expression for normalizing the feature vector W thereof is: ; wherein A is a judgment matrix; The weight vector is the feature vector corresponding to the maximum feature value lambda max of the judgment matrix.
8. The modified material for earthen site disease repair and the repair effect evaluation method thereof according to claim 7, wherein the consistency test expression is: ; In the formula, The method is characterized in that the method comprises the steps of judging the maximum eigenvalue of a matrix A, n is the order of the matrix A, CR is the random consistency proportion, CI is the consistency index, and RI is the average random consistency index.
9. A method for evaluating the repair effect of a modified material for repairing the soil-site diseases, wherein the modified material for repairing the soil-site diseases is adopted in the repair process of the method according to any one of claims 1 to 8, and the method is characterized in that the construction of collapse diseases, denudation diseases and crack disease models is firstly carried out; According to the size of the remains, a steel plate model box with dimensions of bottom width, top width, height, longitudinal length, thickness=0.375 m×0.225m×0.6m×0.4m×10mm is developed; the model and the repairing effect recording method of the three diseases are as follows: (1) Repairing a collapse disease model, namely ramming and shaping original site soil, forming a collapse part by adopting an artificial excavation mode, repairing by adopting a repair method, adopting ACS modified material slurry as mortar between bricks, and recording a model 1.0 year after disease repair; (2) Repairing the erosion disease model, after ramming original site soil, adopting a blower to sand inclusion for blowing erosion, then adopting ACS slurry to spray and repair the surface erosion disease, and recording the effect 1.0 years after repairing; (3) Repairing the crack disease model, preparing a plain soil model, cutting into 2 cracks with the area of 1cmx20cm, repairing the cracks by adopting ACS slurry, and recording the effect 1.0 year after repairing.
10. The method for evaluating the repair effect of a modified material for repairing an earthen site disease according to claim 9, wherein the preparation process of the model comprises the steps of: Selecting soil around the earthen site, rolling, airing and sieving, tamping and forming 6 layers, wherein each layer is 10cm, 3 TDR sensors are respectively embedded at the interface of each layer, and 3 layers of 9 sensors are arranged.

Description

Modified material for repairing soil site diseases and repairing effect evaluation method thereof Technical Field The invention relates to the technical field of earthen site repair, in particular to a modified material for repairing earthen site diseases and a repair effect evaluation method thereof. Background The cultural relics are symbols of human civilization and have important historical, scientific, artistic, social, cultural and emotional values. With the acceleration of the progress of human civilization, many sites of human civilization are dying. The variety of disease repair materials for the earthen site is various, the repair effects of different modified materials are different, the short-term effect of the modified materials in repairing the earthen site is more focused in the past, the difficulty of carrying out a test on the earthen site body is higher due to the characteristics of the cultural relics protection industry and the importance of the earthen site, and the exploration of the long-term weather resistance of the modified materials on the earthen site body is still lacking. Therefore, a silicon-calcium-based composite modified repair material is urgently needed, the optimal proportion and comprehensive engineering performance of the silicon-calcium-based composite modified repair material are obtained through an indoor test, and feasibility of the silicon-calcium-based modified material in repairing an earthen site is further verified based on a model test and an earthen site test section, so that scientific reference is provided for disease repair materials similar to the earthen site. Disclosure of Invention In order to solve the problems, the application provides a modified material for repairing the soil site diseases, wherein the modified material is silicon-calcium-based modified soil; the modified material comprises metakaolin, calcium hydroxide and micro silicon powder modified soil; The metakaolin comprises 44% Al 2O3、52%SiO2; in the modified material, the material mass ratio phi M1 of metakaolin A, calcium hydroxide modified soil C and micro silicon powder modified soil S is A: C: S=1:2:4; wherein, the mass ratio phi of the modified soil is defined as follows: ; Wherein M 1 is the mass (g) of the modified material, M 2 is the mass (g) of plain soil, and when the modified material is more than 1, the mass ratio between the modified materials can be represented as phi M1. Preferably, in the preparation process, the modified materials are firstly mixed and stirred uniformly, then added into plain soil and stirred uniformly, and finally water with the required mass is added; When modified soil with a certain water content is prepared, the preparation is carried out according to the following expression: ; ; Wherein m w is the mass of water to be added to the soil (g), m 0 is the mass of air-dried soil (g), ω 0 is the water content (%) of air-dried soil, ω ́ is the water content (%) required for the soil sample, m is the mass of the soil to be used for sample preparation (g), ρ d is the dry density required for sample preparation (g/cm 3), and V is the volume of the sample preparation device (cm 3). In summary, the modified material for repairing the soil site diseases and the repairing effect evaluation method thereof have the following advantages compared with the prior art: 1. The microstructure test shows that the ACS modified soil contains ettringite, calcite and other new cementing substances, the compactness of the soil body is enhanced, the pores are reduced, and the mechanical property of the modified soil is improved; 2. The addition of the ACS modified material increases the optimal water content by 4.5%, reduces the maximum dry density by 22%, improves the cohesive property by 3.4 times, improves the anti-denudation performance by 40 times, has the disintegration rate and the disintegration rate of only 2.7% and 6.8% of the site soil, has the unconfined compressive strength of 6.1 times of the site soil, has more obvious cohesive effect, has the capillary water lifting height of about 61% of the site soil, has obvious volcanic ash reaction with the site soil along with the increase of the freeze-thawing cycle times, improves the cohesive strength among soil particles, reduces inter-particle pores, enhances the cohesive strength of the soil particles, and has further improved freeze-thawing resistance, thereby being more beneficial to the long-term stability of the structure of the site soil; 3. a model test of the repair effect of the soil site diseases and a crack-based repair effect evaluation method are constructed. The technical process of the present invention will be described in further detail by means of the accompanying drawings and examples. Drawings FIG. 1 shows a pre-crack repair test procedure, wherein (a) in FIG. 1 is 45 degrees, (b) in FIG. 1 is 0 degrees, (c) in FIG. 1 is 90 degrees, (d) in FIG. 1 is a compression mold, and (e) in FIG. 1 is crack