一种考虑曲面地形效应的流动性滑坡运动模型  

A NUMERICAL MODEL FOR SIMULATION OF FLOWSLIDE ON CURVED TOPOGRAPHY

作　　者：郭剑 李同录[1] 李萍[1] 蔺晓燕 沈伟[1] 翟张辉 GUO Jian;LI Tonglu;LI Ping;LIN Xiaoyan;SHEN Wei;ZHAI Zhanghui(Department of Geological Engineering,Chang an University,Xi an 710054;School of Earth Sciences and Engineering,Xi an Shiyou University,Xi an 710065)

机构地区：[1]长安大学地质工程系,西安710054 [2]西安石油大学地球科学与工程学院,西安710065

出　　处：《工程地质学报》2018年第2期319-324,共6页Journal of Engineering Geology

基　　金：国家自然科学基金项目(211026130189;41402274);国家重点基础研究发展计划(973计划)项目(2014CB744701);中央高校基本科研业务费专项资金(310826172001)资助

摘　　要：流动性滑坡在流经曲面地形时会产生附加的离(向)心作用,而以往的研究并未充分考虑这种作用。本文以LS_RAPID模型为基础,补充了在曲面地形下滑体运动所受离(向)心力,修正LS_RAPID模型的控制方程,得到考虑曲面地形效应的流动性滑坡运动模型——LSD_T(Landslide Dynamic_Terrain)模型。运用该模型对一典型流动性滑坡——天水市大沟滑坡进行模拟,并与相同参数下LS_RAPID模型的模拟结果进行对比。结果表明:LS_RAPID模型中曲面地形对滑体运动的限制作用不明显,体现为弯道处滑体冲出沟道,不符合滑坡的实际运动情况;而LSD_T模型则能够较好的反映弯道离(向)心作用的影响,滑体在弯道处顺沟滑动,运动轨迹与实际堆积过程基本一致。The movement of the flowslide is complex due to the centrifugal force and centripetal force of curved topography.However,it was not fully considered in the past.Based on the LS_RAPID model,this paper puts forward a new method to calculate centrifugal force and centripetal force of flowslide mass due to surface topography.The control equations of the LS_RAPID are revised to a new model which considers the influence of surface topography,which is named as LSD_T(Landslide Dynamic_Terrain)model.This new model is used to simulate a typical flowslide-Dagou landslide in Tianshui city.The simulation result is compared with that of LS_RAPID model using the same parameters.Results show that the surface topography s effect on the movement of sliding mass is not obvious in the LS_RAPID model.The sliding mass rushes out of the channel at the corner,which is not conform to the actual movement of the flowslide.However,the LSD_T model can reflect the influence of the centripetal force from curve topography better.The sliding mass moves along the channel.The trajectory is basically consistent with the actual accumulation process.

关 键 词：流动性滑坡 运动模型 数值模拟 有限差分法 

分 类 号：P642.22[天文地球—工程地质学]