摘要
数值模拟是研究高速远程滑坡的重要手段。本文以茂县新磨村滑坡为例,提出一种三维大规模滑坡离散元建模与数值模拟方法。基于离散元法宏微观转换公式和数值模拟测试,快速得到与滑坡体砂岩力学性质类似的离散元堆积模型。并结合滑坡数字高程数据和地层信息,建立起符合滑坡实际地层条件和岩体力学性质的三维离散元薄壳模型,模拟了新磨村滑坡启动、高速下滑和堆积的全过程。模拟结果与实际的滑坡堆积体在形态和分布上非常相似,并且模拟的滑坡速度场变化特点和时间范围与理论估算与实测地震信号较为一致,验证了数值模拟结果的可靠性和方法的有效性。论文共享了数值模拟源代码,可快速构建三维滑坡数值模型,为高速远程滑坡的数值模拟研究和相应灾害范围评估提供一个可选的方法。
Numerical simulation is an important tool in the investigation of high-speed long-runout landslides.Taking the Xinmocun landslide in Maoxian as an example,this paper proposes a 3-dimensional discrete element modeling and numerical simulation method of large-scale landslide. On the basis of the micro-macro conversion formulas and numerical tests of discrete element method,it is able to get a discrete element deposition model that has similar mechanical properties as the sandstone of the landslide. Combined with the digital elevation model data and strata information,a 3-dimensional discrete element shell model is built,which follows the actual strata condition and rock mechanical properties. The initiation,high-speed sliding and accumulation process of Xinmocun landslide is simulated. The simulation results and the actual landslide accumulation are very similar in pattern and distribution,and the characteristics of velocity variation and time scale of simulated landslide coincide with the theoretical values and the measured seismic signal,which validate the reliability of the numerical simulation results and the effectiveness of the method. Source code of the numerical simulation is shared online(http: ∥ matdem.com),with which a three-dimensional model can be built quickly. This paper provides an alternative approach for the study of mechanism of high-speed long-runout landslide and the evaluation of corresponding disaster effects.
作者
刘春
范宣梅
朱晨光
施斌
LIU Chun;FAN Xuanmei;ZHU Chenguang;SHI Bin(School of Earth Sciences and Engineering,Nanjing University,Nanjing 210023;Nanjing University High-tech Institute at Suzhou,Suzhou 215123;State Key Laboratory of Geohazards Prevention and Environment Protection,Chengdu University of Technology,Chengdu 610059)
出处
《工程地质学报》
CSCD
北大核心
2019年第6期1362-1370,共9页
Journal of Engineering Geology
基金
国家自然科学基金项目(41761134089,41977218)
江苏省自然科学基金(BK20170393)
青岛海洋科学与技术国家实验室开放基金项目(QNLM2016ORP0110)资助~~
关键词
离散元
滑坡
三维
数值模拟
MatDEM
Discrete element
Landslide
3-Dimensional
Numerical simulation
Mat DEM
