干湿交替环境下粉质粘土边坡稳定性分析
首发时间:2013-10-21
摘要:为了研究干湿交替循环环境作用下土质边坡的稳定性,本文通过室内干湿循环试验模拟边坡土体的干湿循环作用过程。然后利用三轴剪切试验,得到了边坡土体的抗剪强度及强度参数随干湿循环作用次数的衰减规律。此外,在试验研究成果的基础上,推导出干湿交替循环环境下粉质粘土边坡的安全系数计算理论。通过应用改进的边坡失稳判据和试验研究成果对粉质粘土边坡工程进行了数值模拟分析,获得其安全系数,为类似土质边坡工程稳定性分析提供理论基础和工程参考价值。
关键词: 岩土工程 粉质粘土 试验 干湿循环 土质边坡 安全系数
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Stability analysis of silty clay slope in wetting-drying alternate environment
Abstract:To study the stability of soil slopes in wetting-drying alternate environment, a laboratory simulation of wetting-drying cycles on silty clay slope is conducted in this paper. The law of shear strength and its parameters of silty clay varying with the number of wetting-drying cycles is investigated by triaxial compression test. Based on this, a theory for calculating safety factor of silty clay slope in wetting-drying alternate environment is derived. Then this theory and a modified instability criterion of slope are both applied in the stability analysis of a silty clay slope by numerical simulation. Its safety factor is obtained. It can supply the basic theory and provide engineering reference for the stability analysis of similar soil slope engineering.
Keywords: geotechnical engineering silty clay test wetting-drying cycles soil slope safety factor
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