Effect of the moisture content and dry density on the shear strength parameters of collapsing wall in hilly granite areas of South China  

作　　者：Xiaoyang Wang Xiaoxing Qin Jiahao Tan Linxi Yang Lixing Ou Xiaoqian Duan Yusong Deng 

机构地区：[1]Guangxi Key Laboratory of Forest Ecology and Conservation,College of Forestry,Guangxi University,Nanning,530004,China [2]Guangxi Key Laboratory of Agricultural environment and Agricultural products safety,College of Agriculture,Guangxi University,Nanning,530004,China

出　　处：《International Soil and Water Conservation Research》2024年第3期697-713,共17页国际水土保持研究（英文）

基　　金：the financial support for the Special Projects of the Central Government Guiding Local Science and Technology Development in China(Guike.ZY21195022);the research provided by Guangxi Natural Science Foundation(2021GXNSFBA075017);the National Natural Science Foundation of China(No.42007055 and 42107350);the Guangxi Training Program of Innovation and Entrepreneurship for Undergraduates(No.S202210593236).

摘　　要：The changes in the mechanical properties of collapsing walls under the influence of natural factors in the hilly area of southern China need to be determined.We systematically studied the influence of the interaction of dry densityρ(1.0,1.1,1.2,1.3,1.4 g/cm3)and moisture content w(0.05,0.1,0.15,0.2,0.25 g/g)on the stability of four soil layers in a collapsing wall.The soil cohesion decreased with increasing soil depth.The cohesion force initially increased and then decreased with increasingωand increased with increasingρ;the internal friction angle was mainly affected byωand decreased with increasingω.The cohesion could be used to effectively characterize the stability of the collapsing wall.The shear strength index was modeled based on interaction between the dry density and moisture content(R2>0.95).The optimal combination of moisture content and dry density was obtained,and the collapsing wall was in the most stable state at a moisture content of 0.12-0.19 g/g and a dry density of 1.40 g/cm3.Based on the analysis of the critical height and safety factor(FS),the FS values of the sandy layer(C)was 0.53 and 0.57 forωvalues of 0.25 g/g and 0.05 g/g,respectively.In the alternating process of soil wetting and drying,the basic properties of the soil changed;caused traceback erosion,and thereby affected the stability of the collapsing wall.Our study provides a theoretical basis for the investigation of the factors influencing the stability of collapsing walls.

关 键 词：Benggang Shear strength Cohesion force Internal friction angle Safety coefficient 

分 类 号：S15[农业科学—土壤学]