期刊论文

Effect of acid rain infiltration on shear strength of expansive soil and its microscopic test

Yang, Heping(cscuyang@163.com)

中文

中南大学学报(自然科学版)

1672-7207

2019

50

1

206-213

10.11817/j.issn.1672-7207.2019.01.026

国家自然科学基金资助项目（51608053,51678073,51838001）； 湖南省自然科学基金资助项目（2017JJ3335）； 湖南省研究生科研创新项目（CX2017B458）~~；

本校为第一且通讯机构

为探究酸雨入渗对膨胀土抗剪强度的影响,以广西酸雨重灾区的百色原状膨胀土为研究对象,根据干湿循环影响区土体的实际状态及边界条件,模拟不同酸雨入渗情况(pH为3,5和7)进行抗剪强度试验研究,探究膨胀土抗剪强度变化规律;结合微观试验,研究其微观结构和矿物成分变化特性,揭示酸雨入渗对膨胀土的微观作用机理。研究结果表明:随酸液pH减小,试样抗剪强度不断衰减,黏聚力降幅明显,内摩擦角出现小幅度下降,且在2次干湿循环作用后,黏聚力出现最大降幅;上覆压力越小,抗剪强度衰减越明显;酸雨入渗作用下土体中游离的胶结物呈不同程度溶蚀和淋滤,微孔隙体积和数目均增大,入渗酸液pH越小,该变化趋势愈明显...

In order to explore the effect of acid rain infiltration on the shear strength of expansive soils, the original expansive soil of Baise in the acid rain-affected areas in Guangxi was studied. According to the actual state and boundary conditions of soils in the dry-wet cycle affected area, the different conditions of acid rains infiltration were simulated pH=3, 5, 7) to investigate the evolution law of shear strength of expansive soils. The shear strength tests were conducted under different acid rain infiltration conditions to explore the chan...