强度指标影响下滑坡运动特征及参数反分析  

Post-failure movement characteristics and parameter back-analysis for landslides considering effect of strength parameters

作　　者：张卫杰 余瑞华 陈宇 高玉峰[1,2] 黄雨[3] ZHANG Wei-jie;YU Rui-hua;CHEN Yu;GAO Yu-feng;HUANG Yu(Key Lab of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing 210024,China;College of Civil and Transportation Engineering,Hohai University,Nanjing 210024,China;Department of Geotechnical Engineering,Tongji University,Shanghai 200098,China)

机构地区：[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 [2]河海大学土木与交通学院,江苏南京210024 [3]同济大学地下建筑与工程系,上海200098

出　　处：《岩土工程学报》2022年第12期2304-2311,F0004,共9页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(51808192,51890912,41630638);江苏省优秀青年基金项目(BK20211575);中央高校基本科研业务费专项资金资助项目(B210202039)。

摘　　要：滑坡滑动距离、滑动速度等动力特征对滑坡灾害防治有着重要的意义。已有的滑坡模拟研究,通常以再现滑坡大变形运动过程、揭示参数影响规律为主,缺乏滑坡过程中的参数反分析,难以为灾害防治提供详细的参数支持。对此,在SPH方法的基础上,利用等效黏度概念和宾汉姆流体模型在强度指标和黏度系数之间建立了联系,形成了滑坡大变形运动过程的数值分析方法。结合强度折减,对比滑坡的堆积坡形和波及范围,实现了滑坡滑动过程中强度指标的反分析。通过香港翡翠道滑坡的模拟对比,验证了分析方法的适用性。在此基础上,以四川省盐源县玻璃村“7·19”滑坡为研究案例,分析了不同强度折减系数下滑坡的滑动距离和滑动速度,探讨了强度指标影响下滑坡滑动距离、峰值速度等动力特征的演化规律,最后将模拟结果与滑坡的实际波及范围进行对比,确定了滑坡体在滑动过程中的强度指标。The dynamic characteristics of flow process of landslides such as the sliding distance and the expanding velocity are of great significance to the prevention and control of landslide hazards.The current studies on landslide simulations usually focus on the reappearance of flow process and the influence mechanism of parameters,and with the absence of parameter inversion analysis,they are insufficient to provide detailed data support for the prevention of landslide disasters.Based on the SPH method,the relationship between the strength parameters and the viscosity parameter is established using the equivalent viscosity and the Bingham fluid model so as to form the flow-process simulation method for landslides.The inversion analysis is realized by the combination of the strength reduction technique and the flow profile comparison.Through the simulation and comparison of the Fei Tsui Road landslide in the Hong Kong SAR,the applicability of the proposed method is validated.On this basis,taking the 7·19 landslide in the Boli Village,Yanyuan County of Sichuan Province as the study case,the sliding distance and the expanding velocity under different strength-reduction coefficients are analyzed,and the evolution law of dynamic characteristics such as the sliding distance and the peak velocity are discussed.Comparing with the survey data of topography after the landslide,the strength parameters in the flow process can be preliminaryly determined,which is beneficial to the prevention and control of landslide hazards.

关 键 词：强度指标 滑坡 演化规律 反分析 光滑粒子流体动力学方法 

分 类 号：TU43[建筑科学—岩土工程]