岩土力学2018，Vol.39Issue(4)：1191-1196,6.DOI:10.16285/j.rsm.2017.1808
高庙子膨润土强度时效性试验研究
Experimental study on ageing effect on shear strength of Gaomiaozi bentonite
摘要
Abstract
The ageing effect on the shear strength of Gaomiaozi (GMZ07) bentonite with different water contents were investigated in this paper.Water contents of 10％,18％ and 24％ (saturated) of compacted bentonite specimens were kept constant during curing periods of 0,5,15,30 and 90 days under constant volume conditions.Then,the shear tests on the aged specimens were performed at vertical pressures of 400,800 and 1 600 kPa by using the shear testing apparatus.At the same time,the microstructure features of the aged bentonite specimens were characterized by means of mercury intrusion porosimetry (MIP) test.The test results show that the shear strength of Gaomiaozi bentonite decreases with the ageing time.The shear strength significantly decreases at the early ageing days and then tends to stabilize when the curing time is over certain days.According to the failure envelopes of three specimens with different water contents,the internal friction angles slightly reduce and the cohesion changes little for saturated specimens with the increase in curing time.For the specimens with water contents of 10％ and 18％,the cohesion evidently decreases but the friction angles remain almost unchanged.According to the effective stress of unsaturated soils proposed by Alonso et al and the pore-size distribution,it is considered that the increment in the intra-aggregate pore is the reason for the decrease in the shear strength of the unsaturated bentonite with ageing time.关键词
高庙子膨润土/剪切强度/时效性/黏聚力/内摩擦角Key words
Gaomiaozi bentonite/shear strength/ageing effect/cohesion/internal friction angle分类
建筑与水利引用本文复制引用
孙德安,张乾越,张龙,朱赞成..高庙子膨润土强度时效性试验研究[J].岩土力学,2018,39(4):1191-1196,6.基金项目
国家自然科学基金(No.11672172) （No.11672172）
台州市科技计划项目(No.1702gy09).This work was supported by the National Natural Science Foundation of China (11672172) and the Taizhou Science and Technology Planning Project(1702gy09). （No.1702gy09）
