Open AccessExperiment study on mechanical properties of sand-doped bentonite
Author(s) -
Yupeng Cao,
Rui Zhang,
Guangyu Xu,
Shuai Zhang,
Jianwen Xu
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/768/3/032046
Subject(s) - bentonite , compaction , cohesion (chemistry) , shrinkage , materials science , permeability (electromagnetism) , water content , atterberg limits , direct shear test , geotechnical engineering , composite material , shear (geology) , geology , chemistry , biochemistry , organic chemistry , membrane
Bentonite is a special soil with water expansion and water loss shrinkage properties, which is widely used as backfill material. In order to explore the effect of sand content on the properties of Bentonite, compaction test, w L (liquid limit) and w P (plastic limit) test, direct shear test and permeability test were taken to analyse the compaction, hydrophilic, shear characteristics and permeability of sand-blended bentonite. The results show that as the amount of bentonite increases, w op (the optimal water content), w L , w P and I P (plastic index) of sand-doped bentonite increase, the Pdmax (the maximum dry density) and cohesion increase first and then decrease, the angle of internal friction decreases gradually. When bentonite content is less than 20%, increasing the content of bentonite has significant effect on reducing coefficient of permeability.