Crack Evolution and Shrinkage Deformation Rules of Benggang Soil Under Dry-Wet Cycles

WANG Jiani; ZHANG Xiaoming; DING Shuwen; WANG Yunqi; DUAN Xiaoyang; YANG Qingjie

doi:10.13870/j.cnki.stbcxb.2022.02.015

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Crack Evolution and Shrinkage Deformation Rules of Benggang Soil Under Dry-Wet Cycles

更新时间：2024-11-07

- Crack Evolution and Shrinkage Deformation Rules of Benggang Soil Under Dry-Wet Cycles
- Vol. 36, Issue 2, Pages: 114-121(2022)
- 作者机构：
  
  1. 北京林业大学水土保持学院,北京,100083
  2. 华中农业大学资源与环境学院,武汉,430070
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2022.02.015
  CLC： TU443
- Published：2022
- 稿件说明：
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WANG Jiani, ZHANG Xiaoming, DING Shuwen, et al. Crack Evolution and Shrinkage Deformation Rules of Benggang Soil Under Dry-Wet Cycles[J]. 2022, 36(2): 114-121.
DOI：

WANG Jiani, ZHANG Xiaoming, DING Shuwen, et al. Crack Evolution and Shrinkage Deformation Rules of Benggang Soil Under Dry-Wet Cycles[J]. 2022, 36(2): 114-121. DOI： 10.13870/j.cnki.stbcxb.2022.02.015.

摘要

为提高崩岗土体稳定性

抑制崩壁崩塌。试验共设计6次干湿循环

利用工业相机对脱湿过程中崩岗4层土进行定时定点拍照并结合数字图像处理技术

研究干湿效应下崩岗土体的裂隙演化及收缩变形规律。结果表明:(1)脱湿过程中土体形态变化顺序为轴向收缩、径向收缩和裂隙发育;(2)表面裂隙率与液限、塑性指数、黏粒含量呈显著正相关关系

4层土中表面裂隙率最大值为过渡层18.78%

最小值为砂土层5.41%

崩岗土体剖面上两者为相邻土层

较大差异性会严重破坏崩岗的稳定性;(3)随干湿循环的进行

径向收缩不再发生

轴向收缩、表面裂隙率、裂隙平均宽度逐渐减小

裂隙总长度、裂隙总条数、裂隙交点个数、被分割的土块个数先增加后减小

各参数均在第3次干湿循环后趋于稳定

4层土中过渡层受干湿循环影响最大

砂土层最小。研究结果可为在降雨-蒸发反复交替过程中崩岗发生机理研究提供科学依据。

Abstract

In order to improve the stability of Benggang soil

prevent Benggang wall collapse

an experiment was conducted to study the crack evolution rules and shrinkage deformation rules of Benggang soil under the effect of Dry-Wet (D-W) cycles. A total of six D-W cycles were designed for the experiment

in which the four layers of soil were photographed at a fixed time and fixed site by using industrial cameras during the dehumidification process and in combination of digital image processing technology. Results showed as follows:(1) In the process of dehumidification

the sequence of soil morphology changes was:axial shrinkage

radial shrinkage

and crack development. (2) There was an obvious positive correlation between shrinkage cracking degree and liquid limit

plastic index and clay content. The maximum value of shrinkage cracking degree in the four layers of soil was 18.78% for the transition layer

and the minimum value was 5.41% for the sandy layer. The two soil layers were adjacent to each other on the section of the Benggang

and their great difference caused the terrible influence on the stability of Benggang. (3) As the D-W cycles

the radial shrinkage phenomenon no longer occurred. The rate of axial shrinkage

the rate of surface cracks

and the average width of the cracks gradually decreased. The total length of the cracks

the total number of crack strips

the number of crack intersections

and the number of lumps initially increased

then decreased

all parameters stabilized after the 3rd D-W cycles. Among the four soil layers

the transition layer was the most affected by D-W cycles

and the sandy layer was the smallest. These results could provide a scientific basis for the study on the mechanism of Benggang occurrence during the rain-evaporation cycles.

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