摘要
灾难性地震难以预料、波及面广,地震引发边坡失稳破坏造成的地震地质灾害危害严重,已引起不同学科的广泛关注。如何综合考虑地震作用的不确定性和边坡地震破坏的不确定性,估算边坡地震失稳概率,仍是一个尚未解决的问题。在深入剖析边坡地震稳定性物理力学基础上,区分强度储备稳定性和动力超载稳定性两种边坡地震稳定性涵义,提出边坡对场地地震作用临界抗力概念。采用边坡临界地震动加速度为边坡临界抗力特征参数,架起边坡地震失稳与边坡场地地震作用间桥梁,建立以场地地震作用参数和边坡临界地震抗力为依据的边坡地震失稳概率分析评价体系。从场地地震作用不确定性分析、边坡抗震能力及不确定性分析和边坡地震失稳概率分析3方面介绍边坡地震失稳概率分析方法。该方法对单体边坡地震稳定性分析预测具重要意义。
Catastrophic earthquakes are difficult to predict and affect a wide area.The seismic geological disasters of slopes caused by earthquakes have triggered serious harms,and have aroused extensive attention and in-depth research in different disciplines.How to comprehensively consider the uncertainty of seismic action and the uncertainty of slope seismic damage and estimate the probability of slope seismic instability is still a problem that has not been solved yet.Based on an in-depth analysis of the nature of the physics and mechanics of slope seismic stability,this paper distinguishes the two meanings of slope seismic stability,strength reserve stability and dynamic overload stability,and then proposes the concept of the critical resistance of the slope to the site seismic action.The critical ground motion acceleration of the slope is used as the characteristic parameter of the critical resistance of the slope.Therefore,the bridge between the seismic instability of the slope and the seismic action of the slope site is built,and a probabilistic analysis and evaluation system for slope seismic instability based on site seismic action parameters and slope critical seismic resistance is established.This article introduces the slope seismic instability probabilistic analysis method from three aspects:the uncertainty analysis of the seismic action in the field,the seismic resistance of the slope and its uncertainty analysis,and the probability analysis of the slope seismic instability.This method is of great significance to the analysis and prediction of seismic stability of single slope.
作者
孙进忠
韩赛超
熊峰
李高
Sun Jinzhong;Han Saichao;Xiong Feng;Li Gao(China University of Geosciences,Beijing,100083,China;Key Laboratory of Geological Hazard Prevention of Xinjiang(Xinjiang Institute of Engineering),Urumqi,Xinjiang,830023,China;Beijing Builder’s GardenInternational Co.Ltd.,Beijing,100088,China;Hefei University of Technology,Hefei,Anhui,230009,China;China Non-ferrous Metals Resource Geological Survey,Beijing,100012,China)
出处
《新疆地质》
CAS
CSCD
北大核心
2020年第2期262-268,共7页
Xinjiang Geology
基金
国家自然科学基金项目:边坡地震动力响应特性及失稳临界加速度研究(41272338)
地震波入射方向对边坡地震响应的超声模拟研究(41472277)
地质灾害防治与地质环境保护国家重点实验室开放基金项目:岩土边坡地震稳定性临界加速度分析方法研究(SKLGP2012K020)
地震波入射方向对边坡地震响应影响的超声模拟研究(SKLGP2014K010)
新疆地质灾害重点实验室(新疆工程学院)开放基金项目地震波入射方向对边坡地震响应影响的超声模拟研究共同资助。
关键词
边坡
场地地震作用
边坡地震抗力
边坡地震稳定性
边坡地震失稳概率
Slope
Site seismic action
Slope seismic resistance
Slope seismic stability
Slope seismic instability probability
