Evolution Characteristics of Cracks in Benggang Soil Under Controlled Thickness

WANG Na; WANG Jiani; ZHANG Xiaoming; DUAN Xiaoyang

doi:10.13870/j.cnki.stbcxb.2021.06.024

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Evolution Characteristics of Cracks in Benggang Soil Under Controlled Thickness

更新时间：2025-03-12

- Evolution Characteristics of Cracks in Benggang Soil Under Controlled Thickness
- Vol. 35, Issue 6, Pages: 175-182(2021)
- 作者机构：
  
  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.2021.06.024
  CLC： TU443
- Published：2021
- 稿件说明：
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WANG Na, WANG Jiani, ZHANG Xiaoming, et al. Evolution Characteristics of Cracks in Benggang Soil Under Controlled Thickness[J]. 2021, 35(6): 175-182.
DOI：

WANG Na, WANG Jiani, ZHANG Xiaoming, et al. Evolution Characteristics of Cracks in Benggang Soil Under Controlled Thickness[J]. 2021, 35(6): 175-182. DOI： 10.13870/j.cnki.stbcxb.2021.06.024.

摘要

裂隙发育降低土体承载力、抗剪强度、凝聚力等力学特性，促使崩壁崩塌。在控制土体厚度（0.8，1.6，2.2 cm）条件下，对崩岗4层土体进行室内脱湿试验，通过相机定时定点拍照，并结合数字图像处理技术分析崩岗土体的裂隙演化特征。结果表明：（1）脱湿过程中土体变形均先产生核心收缩，后产生裂隙，且4层土中过渡层最早产生核心收缩与裂隙发育现象；（2）4层土之间，裂隙发育程度呈现为过渡层>红土层>表土层>砂土层，过渡层与砂土层的较大差异会破坏土体的稳定性，加速崩壁崩塌；（3）随着土体厚度的增加，裂隙发育现象减弱，核心收缩现象逐渐增强。对于直径为12 cm的崩岗土体，当厚度为2.2 cm时，无裂隙发育，仅产生核心收缩现象。研究结果可为研究崩壁崩塌机理、提高崩岗稳定性提供科学依据。

Abstract

The development of crack reduces soil bearing capacity

shear strength

cohesion and other mechanical properties

promotes wall collapse. Under the condition of controlling soil thickness (0.8 cm

1.6 cm and 2.2 cm)

the indoor dehumidification test was carried out on the four layers of Benggang soil. The crack evolution characteristics of Benggang soil were analyzed by taking photos at fixed time and fixed points with a camera sand combined with digital image processing technology. The results showed that: (1) During the dehumidification process

the soil deformation first produced radial shrinkage and then the cracks developed

and the transition layer of four layers soil first produced radial shrinkage and cracks. (2) Among the four layers of soil

the degree of crack development followed the order of transition layer > laterite layer > topsoil layer > sandy layer. The large difference between transition layer and sandy layer would destroy the stability of Benggang soil and accelerate wall collapse. (3) With the increasing of soil thickness

crack development gradually weakened

and the core shrinkage phenomenon increased gradually. For the Benggang soil with a diameter of 12 cm

when the thickness was 2.2 cm

there was no crack development and only core shrinkage. The research results could provide scientific bases for studying the collapse mechanism and improving the stability of Benggang soil.

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