水利水电技术（中英文）2024，Vol.55Issue(2)：148-155,8.DOI:10.13928/j.cnki.wrahe.2024.02.013
酸碱环境下泥岩土石混合体剪切特性研究
Study on shear characteristics of mudstone soil-rock mixture under acid-alkali environment
摘要
Abstract
[Objective]The distribution of mudstone soil-rock mixtures in the central and western strata of China is common,and its shear strength characteristics determine the safety and stability of mudstone foundation engineering and slope.The shear strength characteristics of mudstone soil-rock mixture are easily affected by the external acid-base environment.In order to explore the influence of acid-base concentration on the shear strength characteristics of mudstone soil-rock mixture,[Methods]in this paper,the samples were soaked in different concentrations of HCl and NaOH solutions,and the indoor triaxial shear tests were carried out under confining pressures of 100,200,300 kPa,respectively.The internal structure characteristics were ob-served and analyzed by scanning electron microscopy.[Results]The result show that the triaxial stress-strain curve of mudstone soil-rock mixture is obviously different from that of pure mudstone and soil.With the increase of acid-base concentration,the peak shear strength and residual strength of mudstone soil-rock mixture decrease,the cohesion decreases linearly,and the internal friction angle does not change significantly.The decrease of peak shear strength,residual strength and cohesion of sam-ples in acidic environment is greater than that in alkaline environment.[Conclusion]The result show that the mudstone blocks constitute a new skeleton system;the shear strength degradation effect of mudstone soil-rock mixture in acidic environment is more significant than that in alkaline environment,which can provide reference for the stability analysis and disaster prevention engineering of mudstone soil-rock mixture foundation and slope.关键词
泥岩/土石混合体/酸碱浓度/抗剪强度/力学性能/变形/影响因素Key words
mudstone/soil-rock mixture/acid and alkali concentration/shear strength/mechanical properties/deformation/influence factor分类
地质学引用本文复制引用
段国勇,徐广超,罗文庆,李森..酸碱环境下泥岩土石混合体剪切特性研究[J].水利水电技术（中英文）,2024,55(2):148-155,8.基金项目
国家自然科学基金项目(U2034203) （U2034203）
