摘要
为探求含水率和干密度对黄土边坡稳定性的影响,通过室内抗剪试验获得黄土在不同含水率和干密度下的力学参数。结合力学参数,对均质黄土边坡的稳定性进行有限元模拟,得到不同含水率和干密度下黄土边坡的安全系数和滑动面随含水率和干密度的变化趋势。结果表明:黄土边坡的安全系数随含水率的增大呈幂函数形式下降,随干密度的增大呈线性函数形式上升;在黄土边坡中存在某一临界含水率,当边坡的含水率低于临界含水率时,边坡的安全系数受含水率影响较大;当边坡的含水率高于临界含水率时,边坡的安全系数受含水率影响较小;在数学角度上确定了含水率和干密度对黄土边坡的安全系数均有显著影响,但含水率对安全系数影响更大;含水率的增大促使滑动面向边坡表面发展,干密度的增大促使滑动面向边坡深处发展。研究结果可为黄土边坡治理提供一定的参考价值。
In order to explore the influence of water content and dry density on the stability of loess slope,the mechanical parameters of loess under different water content and dry density were obtained by indoor shear test.Based on the mechanical parameters,the finite element simulation of the stability of homogeneous loess slope is carried out.The safety factor and sliding surface of loess slope under different water content and dry density are obtained.Then the safety coefficient of loess slope and the sliding surface with water content and dryness are analyzed.The trend of density changes.The results show that the safety factor of loess slope decreases with the increase of water content as a power function,and increases linearly with the increase of dry density.There is a certain critical water content in the loess slope.When the water content in the slope is lower than the critical water content,the safety factor of the slope is greatly affected by the water content;when the water content of the slope is higher than the critical water content,the safety factor is less affected by the water content;the two-factor analysis of variance is used to mathematically determine that the water content and dry density have significant effects on the safety factor of the loess slope,but the water content has a greater impact on the safety factor of the slope;The increase in the rate promotes the development of the sliding surface facing the slope,and the increase in the dry density causes the sliding to develop deeper into the slope.The research results provide a certain reference value for the treatment of loess slope.
作者
牛文龙
徐鹏飞
李浩
秦景
NIU Wenlong;XU Pengfei;LI Hao;QIN Jing(China Institute of Water Resources and Hydropower Research,Beijing 100044,China;Beijing IWHR Corporation,Beijing 100048,China)
出处
《水利水电技术（中英文）》
北大核心
2022年第S02期380-385,共6页
Water Resources and Hydropower Engineering
基金
科技部国家重点研发计划(2018YFC1508203)
关键词
黄土边坡
含水率
干密度
安全系数
滑动面
loess slope
water content
dry density
safety factor
slip surface
