复杂地形边坡精细化建模及数值模拟分析  

Refined Modeling and Numerical Simulation Analysis of Slope in Complex Terrain Conditions

作　　者：昝文博 王宁[1] 张文接 杨谦[1] 赵春晨 ZAN Wenbo;WANG Ning;ZHANG Wenjie;YANG Qian;ZHAO Chunchen(School of Civil Engineering,Shaanxi Polytechnic Institute,Xianyang 712000,China;School of Highway,Chang'an University,Xi'an 710064,China)

机构地区：[1]陕西工业职业技术学院土木工程学院,陕西咸阳712000 [2]长安大学公路学院,陕西西安710064

出　　处：《甘肃科学学报》2023年第4期40-45,共6页Journal of Gansu Sciences

基　　金：陕西省教育厅科技项目(20JK0501);陕西工业职业技术学院科研基金资助项目(2022YKZD-007)。

摘　　要：针对复杂地形条件下边坡稳定性分析遇到的一些问题,以关中地区白鹿塬某黄土边坡为例,基于无人机倾斜摄影测量与地面三维激光扫描数据融合构建了复杂地形高精度DEM模型,同时利用多种软件互相转换快速建立复杂边坡精细化数值模型,进一步选取凹型、凸型、凹凸型以及凸凹型4种边坡进行了稳定性分析。结果表明:(1)经过滤波处理、ICP算法反复迭代配准的DEM模型精度可以达到0.2 m,同时结合地层分布扩展、切割建立复杂边坡精细化模型的思路是合理可行的;(2)天然状态下凹凸型边坡安全系数最大,凸凹型边坡安全系数最小,单一的凹型或凸型边坡安全系数介于上述两者之间,4种坡型滑动面形态均接近圆弧型且安全系数大于1.05;(3)4种坡型对降水强度的敏感性排序为凹凸型>凸型>凹型>凸凹型,对地震作用和坡顶堆载的敏感性排序均为凹凸型>凸凹型>凹型>凸型。研究结果对于复杂地形边坡数值模拟分析与评估具有重要的参考价值。Aiming at some problems encountered in slope stability for complex terrain,a high-precision DEM model was established by the UAV tilt photogrammetry and ground three-dimensional laser scanning based on a loess slope in Bailuyuan,Guanzhong region.Meanwhile,multiple softwares were used to establish the refined numerical model of complex slope,and the concave,convex,concave-convex and convex-concave slopes were further chosen for stability analysis.The results show that:(1)After filtering and iterative registration of ICP algorithm repeatedly,the accuracy of DEM model can reach 0.2m and it is feasible to establish a refined model of complex slope combined with stratum distribution by expanding and cutting.(2)Under natural conditions,the safety factor of concave-convex combined slope is the largest and that of convex-concave combined slope is the smallest.The safety factor of single concave or convex slope is between the above two patterns.The sliding surfaces of the four typical slopes are close to circular-arc and the safety factors are greater than 1.05.(3)The sensitivity of four representative slopes to rainfall intensity is concave-convex>convex>concave>convex-concave,and the sensitivity to seismic action and surcharge on the top of the slope is concave-convex>convex-concave>concave>convex.The research results have great value for the analysis and evaluation of numerical simulation in complex terrain slope.

关 键 词：复杂地形边坡 建模技术 数值模拟 安全系数 滑移变形 

分 类 号：TU43[建筑科学—岩土工程]