长江科学院院报2018，Vol.35Issue(6)：81-85,91,6.DOI:10.11988/ckyyb.20160801
弱膨胀土干湿循环直剪强度试验研究
Direct Shear Test on Strength of Weak Expansive Soil under Dry-wet Cycles
边加敏1
作者信息
- 1. 南京交通职业技术学院路桥与港航工程学院,南京 211188
- 折叠
摘要
Abstract
Direct shear test was conducted on weak expansive soil specimens of two different dry densities under dry-wet cycles.The test soils were collected from the bank slope of Xuhe River in Nanjing.The shear stress,cohe-sion and internal friction angle of soil after dry-wet cycles were analyzed,and the variation rules of direct shear strength were investigated.Test results indicated that cracks of expansive soil expanded and widened irreversibility with the increase of dry-wet cycles;cohesion of soil of different densities decreased with the increasing of dry-wet cycles,and tended to be uniform;internal friction angle showed no obvious change.Moreover,overburden pressure during the direct shear had an apparent influence on shear stress decay.Larger overburden pressure resulted in smaller decay.In conclusion,shear strength parameters under low stress is recommended for stability analysis of ex-pansive soil slope.关键词
弱膨胀土/干湿循环/直剪强度/强度衰减/上覆压力Key words
weak expansive soil/dry-wet cycles/direct shear strength/strength decay/overburden pressure分类
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边加敏..弱膨胀土干湿循环直剪强度试验研究[J].长江科学院院报,2018,35(6):81-85,91,6.
