局部荷载作用下风积砂路基边坡稳定性研究  

Study on Stability of Aeolian Sand Subgrade Slope Under Local Load

作　　者：杜晨妍 李学丰 DU Chenyan;LI Xuefeng(School of Physics and Electronic-Electrical Engineering,Ningxia University,Yinchuan 750021,China;Laboratory of Solid Mechanics,Ningxia University,Yinchuan 750021,China)

机构地区：[1]宁夏大学物理与电子电气工程学院,宁夏银川750021 [2]宁夏大学固体力学研究所,宁夏银川750021

出　　处：《宁夏工程技术》2022年第3期207-211,共5页Ningxia Engineering Technology

基　　金：国家自然科学基金资助项目(1216020092);宁夏科技创新领军人才计划项目(KJT2019001)。

摘　　要：为了对风积砂路基边坡的失稳破坏过程进行分析,根据砂土三轴试验的微观参数模拟以及土工离心模型试验原理,采用PFC2D颗粒流软件建立风积砂路基边坡模型,通过施加不同大小、不同范围的局部荷载,从位移场、能量转化等多个角度深入分析了路基边坡的稳定性。结果表明:同一位置的局部荷载越大,坡面沉降量越大,滑裂面高度越低;同一大小的局部荷载分布范围小于临界值时,滑动破坏面范围小,大于临界值时,滑裂面延伸到坡面,造成边坡失稳破坏;边坡的稳定性可以用能量转化来描述,滑坡体越大,重力做功、摩擦做功等能量转换也就越大。The unstable failure process of aeolian sand subgrade slope was analyzed based on discrete element method(DEM).According to the micro-parameter simulation of the sand triaxial test and the principle of geotechnical centrifuge model test, a model of aeolian sand subgrade slope was established by PFC2D. By applying local loads of different sizes and ranges, the stability of the subgrade slope was analyzed from perspectives of displacement field and energy conversion. The results show that the greater the local load at the same position, the greater the slope settlement and the lower the height of the slip surface.When the local load distribution range of the same size is less than the critical value, the range of the sliding failure surface is small;when it is greater than the critical value, the sliding failure surface would extend to the slope surface, resulting in the slope unstable failure. The energy conversion can be used to describe the stability of the slope. The larger the landslide,the greater the energy conversion such as gravity work and friction work.

关 键 词：边坡稳定性 离散元 功能转化 

分 类 号：TU432[建筑科学—岩土工程]