岩土力学2024，Vol.45Issue(4) ：1039-1050,1080.DOI:10.16285/j.rsm.2023.0560

黏聚力随机场波动范围的各向异性对流态性滑坡滑动距离的影响

Influence of anisotropy of fluctuation scale of cohesion random field on the run-out distance of flow-like landslides

张卫杰 张炜 陈宇 杜颖 姬建 高玉峰
岩土力学2024，Vol.45Issue(4) ：1039-1050,1080.DOI:10.16285/j.rsm.2023.0560
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  • 万方数据

黏聚力随机场波动范围的各向异性对流态性滑坡滑动距离的影响

Influence of anisotropy of fluctuation scale of cohesion random field on the run-out distance of flow-like landslides

张卫杰 1张炜 2陈宇 3杜颖 2姬建 1高玉峰1
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作者信息

  • 1. 河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京 210024;河海大学土木与交通学院,江苏南京 210024
  • 2. 河海大学土木与交通学院,江苏南京 210024
  • 3. 江苏筑森建筑设计有限公司,江苏常州 213022
  • 折叠

摘要

流态性滑坡的大变形运动过程受到诸多因素的影响,其中一个重要因素便是岩土体的强度参数.由于现场测试和室内试验的局限性,强度参数往往呈现出明显的空间变异性,同时在不同方向上具有不同的波动范围,即随机场波动范围具有各向异性.针对黏聚力随机场波动范围的各向异性对流态性滑坡滑动距离的影响问题,引入基于乔列斯基分解的中心点法实现了各向异性随机场的离散,采用摩尔-库仑破坏准则和非牛顿流体模型相结合的光滑粒子流体动力学(smoothed particle hydrodynamtcs,SPH)分析方法模拟了流态性滑坡的滑动距离,在蒙特卡洛模拟框架上提出了流态性滑坡的随机分析方法.然后,通过羊宝地滑坡和水平地层模型的模拟,验证了流态性滑坡确定性分析方法和随机场离散方法的适用性.最后,根据汶川地震中王家岩滑坡的地形资料构建了概念性的滑坡分析算例,讨论了黏聚力随机场中各向异性波动范围影响下滑坡运动过程的变化,分析了滑动距离的概率分布规律.结果表明:竖直波动范围的增加会增大滑坡滑动距离的分布范围,使其表现出更强的离散性;在黏聚力参数符合对数正态分布的前提下,滑动距离的分布也符合对数正态分布,说明流态性滑坡滑动距离的概率分布与强度参数的不确定性具有一定的联系.

Abstract

This study investigates the influence of many factors,specifically the strength parameters of geotechnical materials,on the run-out distance of flow-like landslides.Due to the limitations of field tests and laboratory experiments,strength parameters of soils usually exhibit significant spatial variability with different scales of fluctuation(SOF)in different directions,which is the anisotropy of SOF.Aiming at the influence mechanism of anisotropic SOF of the cohesion random field on the run-out distance of flow-like landslides,this study introduced the mid-point method based on the Cholesky decomposition to generate the anisotropic random field.The smoothed particle hydrodynamics(SPH)analysis method,combined with the Mohr-Coulomb failure criterion and the non-Newtonian fluid model,was used to simulate the sliding process and run-out distance of landslides.A stochastic analysis method for the flow-like landslide motion process was established within Monte Carlo simulation framework.Then,by simulating the Yangbaodi landslide and the horizontal strata model,the applicability of the SPH method and the random field discretization method was validated.Finally,a conceptual landslide case was constructed based on the topographic data of the Wangjiayan landslide that was triggered by the Wenchuan earthquake.The study discussed the movement process under the anisotropic SOF in the random field of cohesion and analyzed the probability distribution characteristics of run-out distances.The results show that an increase in the vertical fluctuation range results in a wider range of variation in run-out distance,and the sliding distances exhibit a discrete nature;on the premise that the cohesion parameter conforms to the lognormal distribution,the distribution of the run-out distance also conforms to the same lognormal distribution,which proves that the run-out distance distribution of flow-like landslides is closely related to the distribution characteristics of inputted parameters.

关键词

黏聚力/波动范围/各向异性/流态性滑坡/滑动距离/光滑粒子流体动力学/随机分析

Key words

cohesion/scale of fluctuation/anisotropy/flow-like landslide/run-out distance/smoothed particle hydrodynamics(SPH)/stochastic analysis

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基金项目

国家自然科学基金(52278344)

国家自然科学基金(51890912)

江苏省优秀青年基金(BK20211575)

出版年

2024
岩土力学
中国科学院武汉岩土力学研究所

岩土力学

CSTPCD北大核心
影响因子：1.614
ISSN：1000-7598
参考文献量43
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