文献类型：期刊文献

英文题名：Relationships between shear strength parameters and microstructure of alkaline-contaminated red clay

作者：Wang, Qi Chen, Jun Liu, Jiankun Yu, Mingyuan Geng, Weijuan Wang, Pengcheng Wu, Zhonghu

第一作者：Wang, Qi

通信作者：Liu, JK[1];Liu, JK[2];Liu, JK[3]

机构：[1]Beijing Jiaotong Univ, Sch Civil Engn, Beijing 100044, Peoples R China;[2]Guizhou Inst Technol, Guiyang 550007, Peoples R China;[3]Sun Yat Sen Univ, Sch Civil Engn, Guangzhou 510006, Peoples R China;[4]Southern Marine Sci & Engn Guangdong Lab, Zhuhai, Peoples R China;[5]China Acad Railway Sci Corp Ltd, Railway Engn Res Inst, Beijing 100081, Peoples R China;[6]Guizhou Univ, Coll Civil Engn, Guiyang 550025, Peoples R China

第一机构：Beijing Jiaotong Univ, Sch Civil Engn, Beijing 100044, Peoples R China

通信机构：corresponding author), Beijing Jiaotong Univ, Sch Civil Engn, Beijing 100044, Peoples R China;corresponding author), Sun Yat Sen Univ, Sch Civil Engn, Guangzhou 510006, Peoples R China;corresponding author), Southern Marine Sci & Engn Guangdong Lab, Zhuhai, Peoples R China.

年份：2020

卷号：27

期号：27

起止页码：33848-33862

外文期刊名：ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH

收录：;Scopus(收录号：2-s2.0-85086411482);WOS:【SCI-EXPANDED(收录号:WOS:000539847700002)】；

基金：This research was supported by National Natural Science Foundation of China (No. 41731281) (No. 41801055), the project funded by China railway Corporation under Grant (No. 2017G002-S), the Guizhou Science and Technology Fund (No. [2019]1142), the Startup Fund of Sun Yat-sen University (No. 76140-18841212) and the Fundamental Research Funds for the Central Universities (No. 2020YJS122).

语种：英文

外文关键词：Alkaline-contaminated red clay; Cohesion; Friction angle; Microstructure; Rock engineering systems

摘要：The leachate (pH = 14) from alumina production changes the mechanical properties of red clay, and the shear strength parameters of the system vary due to the multiple-dimensional interactions of the microscopic parameters. In this paper, the alumina production liquid and the concentrations of the NaOH solution were designed to contaminate the red clay during 80 days. The cohesion and friction angle of the alkaline-contaminated red clay were obtained from direct shear tests. Through qualitative and quantitative analyses using scanning electron microscopy (SEM), the microstructure was observed. Based on the rock engineering systems (RES) theory, interactions among microscopic parameters were analysed, and the relationships between shear strength parameters and microscopic parameters of alkaline-contaminated red clay were established. Results show that both of the cohesion and friction angle of alkaline-contaminated red clay are increased in general; the adsorption in alumina production liquid and dispersing effect of 0.7% NaOH concentration are noticeable, and the interactions of the microscopic parameters are intense; the ratio of the intra-aggregate pore number, the probability distribution index and the number of particles can significantly influence cohesion; the particle morphology fractal dimension, aspect and probability entropy have a severe effect on friction angle. This work is expected to serve as a reference for future research on the relationship between macroscopic properties and microcosmic structure of soil.