CN-121976550-A - Expansive soil slope intelligent response self-adaptive anchor rod supporting structure and construction method

CN121976550ACN 121976550 ACN121976550 ACN 121976550ACN-121976550-A

Abstract

The invention relates to the technical field of geotechnical engineering slope support, in particular to an intelligent response self-adaptive anchor rod support structure of an expansive soil slope and a construction method, comprising a support anchor rod and a slope protection structure; the slope protection structure sequentially comprises an intelligent response water sealing layer paved on a slope and a slope protection drainage layer covered on the slope from inside to outside, wherein the support anchor rod sequentially comprises an anchor rod head, an anchor rod yielding device, an anchor rod free section and an anchor rod anchoring section, the anchor rod free section and the anchor rod anchoring section are integrally formed rod bodies, in the scheme, a distributed humidity adjusting system formed by a water expansion rubber sleeve and a rubber ring is used for realizing dynamic following and regulation of the humidity of a slope soil body, and secondly, an intelligent working cycle of rigid locking, flexible yielding and automatic resetting of the support system is realized by integrating a constant resistance yielding device, so that the prestress can be precisely controlled, the excessive deformation energy can be safely released, and the safety and durability of the support system under repeated expansion and shrinkage loads are remarkably improved.

Inventors

HE TIANQIN
WANG QIDA
JIAO YONGPING
HAN HUIFENG
MA GUOGANG
CHENG SHENGPING
WU PING
JIA RUI
ZHAO HAO
MA XIAOBAO
Ma Tianbin
LI WENDONG
LI SHENGPENG
QI JIE
ZHANG WEIQIANG

Assignees

中国市政工程西北设计研究院有限公司

Dates

Publication Date: 20260505
Application Date: 20260409

Claims (6)

1. The intelligent response self-adaptive anchor rod supporting structure for the expansive soil slope is characterized by comprising a supporting anchor rod and a slope protection structure, wherein the slope protection structure sequentially comprises an intelligent response water sealing layer (6) paved on a slope and a slope protection drainage layer (5) covered on the slope from inside to outside, the supporting anchor rod sequentially comprises an anchor rod head (1), an anchor rod yielding device (2), an anchor rod free section (3) and an anchor rod anchoring section (4), and the anchor rod free section (3) and the anchor rod anchoring section (4) are integrally formed rod bodies; The anchor rod head (1) is connected with the rod body through an anchor rod yielding device (2), the anchor rod yielding device (2) comprises a cylindrical connecting sleeve (201), a shaft force transmission rod (202) is connected inside the connecting sleeve (201) in a sliding manner, one end of the shaft force transmission rod (202) penetrates through the connecting sleeve (201) and is in threaded connection with the upper anchor rod (103), the other end of the shaft force transmission rod is fixedly connected with a conical plug (203), and a friction assembly (206) formed by three arc friction blocks (209) which are annularly arranged is arranged between the conical plug (203) and the connecting sleeve (201); The outside fixedly connected with that is annular design of axial force transmission pole (202) is pushed away dish (204) with the taper plug, has integrated on the taper plug pushes away dish (204) and has become pre-compaction adjustment mechanism (208) by a plurality of pretension screws, is provided with pre-compaction spring (207) respectively between taper plug pushing away dish (204) and three friction blocks (209), and the outside of axial force transmission pole (202) is equipped with reset spring (205).
2. An expansive soil slope intelligent response self-adaptive anchor bolt supporting structure as claimed in claim 1, characterized in that the intelligent response water sealing layer (6) is formed by mixing and compacting SAP particles, bentonite and sand, and the slope protection drainage layer (5) is formed by assembling EPS modules with mortises.
3. An expansive soil slope intelligent response self-adaptive anchor bolt supporting structure as claimed in claim 1, characterized in that the outer of the rod body of the anchor bolt free section (3) is wrapped with a water expansive rubber sleeve (302).
4. An expansive soil slope intelligent response self-adaptive anchor bolt support structure according to claim 1, characterized in that the anchor bolt anchoring section (4) is provided with a plurality of water expansion rubber rings (403) at equal intervals, so that the anchor bolt anchoring section (4) is divided into a plurality of segmented anchoring units (402).
5. The intelligent response self-adaptive anchor bolt supporting structure of the expansive soil slope according to claim 1, wherein the anchor bolt head (1) comprises a lock nut (101), an anchor plate (102) and an upper anchor bolt (103), and the anchor plate (102) is a galvanized steel plate with anti-slip teeth arranged at the bottom.
6. A method of constructing an expansive soil slope intelligent response adaptive anchor support structure embodying the expansive soil slope intelligent response adaptive anchor support structure of any of claims 1 to 5, the method comprising the steps of: S1, constructing an intelligent response water sealing layer (6), namely uniformly dry-mixing SAP particles, bentonite and medium coarse sand according to a designed proportion, adding water, wet-mixing, layering, paving on a slope surface, and tamping; s2, splicing the slope protection drainage layer (5), namely splicing the EPS module with the mortise on the intelligent response water sealing layer (6); s3, drilling and cleaning holes; s4, installing the rod body, namely installing a supporting anchor rod body with a water expansion rubber sleeve (302) and a spacer sleeve with a water expansion rubber ring (403) into a drill hole; s5, sectional pressure grouting, namely carrying out graded pressurizing grouting on each sectional anchoring unit (402) from bottom to top through a grouting pipe and a sectional grouting valve at the bottom of the anchor rod body, wherein the steps are as follows: The method comprises the steps of firstly setting initial pressure, gradually lifting the initial pressure to target pressure according to a set pressurizing value by taking the initial pressure as a starting point, and completing grouting after stabilizing the pressure when the grouting rate is smaller than a threshold value under the target pressure; s6, installing an anchor rod yielding device (2) and an anchor rod head (1), and tensioning and locking, wherein the anchor rod yielding device is specifically as follows: the method comprises the following steps of pre-installing, namely assembling a reset spring (205), a conical plug pushing disc (204), a conical plug (203), a friction assembly (206), a pre-compression spring (207) and a pre-compression adjusting mechanism (208) in a connecting sleeve (201) in a factory, adjusting and locking the pre-compression amount of the pre-compression spring (207) through the pre-compression adjusting mechanism (208), ensuring that the yielding threshold value of each anchor rod is strictly consistent with a design value, and sealing the connecting sleeve (201) after calibration is completed to form an independent anchor rod yielding device (2); The anchor rod yielding device (2) is installed, wherein a middle anchor rod (301) is in threaded connection with a connecting sleeve (201), an anchor plate (102) is arranged at a drilling hole head, an upper anchor rod (103) passes through a through hole of the anchor plate (102) to be in threaded connection with a shaft force transmission rod (202), and a locking nut (101) is rotated to squeeze the anchor plate (102); and (3) pressure locking, namely connecting tensioning equipment with an upper anchor rod (103), tensioning in a grading manner, stabilizing for 5-10 minutes after each stage of tensioning, and finally locking through a locking nut (101).

Description

Expansive soil slope intelligent response self-adaptive anchor rod supporting structure and construction method Technical Field The invention relates to the technical field of geotechnical engineering slope support, in particular to an intelligent response self-adaptive anchor bolt support structure for an expansive soil slope and a construction method. Background The expansive soil is rich in clay minerals with strong hydrophilicity such as montmorillonite and illite, has obvious water absorption expansion and water loss shrinkage cracking characteristics, and the repeated expansion and shrinkage of the expansive soil form serious potential safety hazards to engineering construction, especially slope engineering stability. During rainfall, the water infiltrates to expand the soil body and generate huge expansion stress, and during drought period, the water evaporates to shrink the soil body and form criss-cross stretching cracks. The dry-wet circulation effect not only remarkably attenuates the soil intensity, but also forms a vicious circle, wherein shrinkage cracks provide a convenient channel for deep infiltration of the next rainfall, so that more severe deep expansion deformation is caused, and finally unstable damage such as shallow slump and deep sliding of the side slope is initiated. The anchor rod is used as a common slope prevention and treatment measure, the anchor rod is embedded into stable rock soil through an anchoring section, and the measures such as net-hanging sprayed concrete, frame grid beams, concrete panels and the like are adopted on the slope surface to be matched with the anchor rod for use, so that surface protection and deep reinforcement are realized. However, for the expansive soil slope protected by the traditional anchor rod, the expansive soil absorbs water and expands in the rainy season slope, the stress of the anchor rod is increased rapidly due to the constraint of the anchor rod on the deformation of the expansive soil, the expansive force can be generated on the anchor rod due to the expansion deformation of the expansive soil, and the grouting body of the anchor section can be pulled out or the anchor rod body is damaged by pulling resistance, so that the anchor rod is invalid and the slope is damaged. During drought, the expansive soil is dehydrated and contracted, a gap is formed between the soil body and the grouting body of the anchoring section, the anchoring resistance of the anchor rod can be lost and cannot be recovered, the anchoring force of the anchor rod is reduced, the safety coefficient of slope stability is affected, and the landslide risk is increased. And the expansion soil is dehydrated and contracted to form a channel for rainwater infiltration along with the generation of a tensioning crack, so that the damage of the expansion soil expansion deformation to the anchor rod structure is increased. In a word, the expansive soil side slope adopts the traditional anchor rod protection measure, and the anchor rod is easy to lose efficacy under the action of the dry and wet circulation of the external environment, so that the side slope is unstable and damaged. Therefore, the invention provides an intelligent response self-adaptive anchor bolt supporting structure of an expansive soil slope and a construction method, and the distributed humidity adjusting system formed by the water expansion rubber sleeve and the rubber ring is arranged on the anchor bolt body, so that dynamic following and adjusting of the humidity of the soil body of the side slope are realized, the water absorption in rainy seasons is reduced, the water is released in dry seasons to compensate the soil body to inhibit shrinkage cracks, and the vicious cycle of shrinkage-seepage-wet expansion which leads to instability of the side slope is cut off. Secondly, through integrating the constant resistance yielding device, the intelligent working cycle of 'rigid locking-flexible yielding-automatic resetting' of the support system is realized, the prestress can be precisely controlled, the excessive deformation energy is safely released, and the safety and durability of the support system under repeated expansion and contraction loads are obviously improved. Disclosure of Invention The technical problem to be solved is that the anchor rod is easy to fail under the action of the dry-wet circulation of the external environment by the traditional anchor rod protection measures, so that the side slope is unstable and damaged. Aiming at the defects of the prior art, the invention provides an intelligent response self-adaptive anchor bolt supporting structure for an expansive soil slope and a construction method, and further solves the technical problems in the background art. In order to achieve the above purpose, the invention is realized by the following technical scheme: The intelligent response self-adaptive anchor rod supporting structure for the expansive soil slope comprises a supporting a