水利水电技术2017，Vol.48Issue(5)：142-147,6.DOI:10.13928/j.cnki.wrahe.2017.05.022
干湿循环作用下砂岩的劣化及破坏特性研究
Study on deterioration and failure characteristics of sandstone under effect of wet-dry cycle
摘要
Abstract
Aiming at the problem from the strength reduction of sandstone mass at water-level-fluctuation zone that is prone to cause the instability of sandstone slope,the wet-dry cycle process of the rock is simulated with the treatment mode of soaking and drying by taking the sandstone samples taken from the typical reservoir bank slope at Shazhenxi Town of Zigui County within the area of the Three Gorges Reservoir as the study objective,for which the uniaxial compression test and the direct shear test are made on the samples in groups,and then the failure process is analyzed from the aspect of deformation through the relevant numerical simulation.The result shows that the effect from the wet-dry cycle on the deterioration of the sandstone appears strongly at the initial period of the cycle and then is gradually reduced along with the increase of the number of the cycle.Under the same cyclic conditions,the ultimate shear strength of the sandstone is increased along with the increase of the normal stress,while it is decreased along with the increase of the wet-dry cycles under the same effects of the normal stress.Moreover,the cohesion and internal friction angle are gradually decreased along with the increase of the number of wet-dry cycle.Meanwhile,the total degree of deterioration is increased gradually as well.The test result has a better reference value for the analysis made on the stability of reservoir sandstone slope.关键词
干湿循环/单轴压缩试验/直接剪切试验/数值模拟Key words
wet-dry cycle/uniaxial compression test/direct shear test/numerical simulation分类
建筑与水利引用本文复制引用
向力,王乐华,陈招军,李洁,马云彪..干湿循环作用下砂岩的劣化及破坏特性研究[J].水利水电技术,2017,48(5):142-147,6.基金项目
国家自然科学基金重点项目(51439003) （51439003）
国家自然科学基金项目(51679128) （51679128）
水利部公益性行业科研专项经费项目(201401029) （201401029）
2016三峡大学研究生科研创新基金(SDYC2016016) （SDYC2016016）
