地震条件下危岩崩塌运动特性的初步探讨

发布时间：2018-04-07 14:53

本文选题：危岩崩塌　切入点：地震荷载　出处：《岩土力学》2017年02期

【摘要】：危岩崩塌是一种常见且破坏性极大的地质灾害,而地震是导致危岩崩塌的主要因素之一。数值模拟是研究危岩崩塌的重要手段。以概念危岩为例,运用非连续变形分析(DDA)法研究了地震荷载对危岩体崩塌块体运动特性的影响。对无地震荷载和3种不同地震荷载输入方式的4种工况进行了模拟。研究结果表明:地震荷载对危岩崩塌破坏有促进作用,不同的地震荷载输入方式对崩塌块体的运动特性有着显著的差异。从算例来看,竖向地震动对崩塌块体运动距离的影响程度甚至比水平地震动对其的影响程度更大,这与人们的传统观念不同,在今后的地震危岩崩塌防治措施设计中,应对竖向地震荷载给予足够的重视。
[Abstract]:Dangerous rock collapse is a common and destructive geological hazard, and earthquake is one of the main factors leading to dangerous rock collapse.Numerical simulation is an important method to study the collapse of dangerous rock.Taking the concept of dangerous rock as an example, the effect of earthquake load on the movement characteristics of collapse block of dangerous rock mass is studied by using the method of discontinuous deformation analysis (DDA).In this paper, four working conditions with no seismic load and three different modes of seismic load input are simulated.The results show that the earthquake load can promote the collapse failure of dangerous rock, and the different input modes of earthquake load have significant difference on the movement characteristics of collapse block.From the example, the influence of vertical ground motion on the movement distance of collapse block is even greater than that of horizontal ground motion, which is different from traditional people's idea.Adequate attention should be paid to vertical seismic loads.
【作者单位】：西南交通大学土木工程学院;中铁隧道集团有限公司勘测设计研究院;九州大学土木与建筑工程学院;
【基金】：国家自然科学基金(No.51408511,No.41672286) 日本学术振兴会特别研究员奖励费(No.16F16056) 中央高校基本科研业务费专项资金资助(No.2682014RC19,No.2682015CX080,No.2682016CY11)~~
【分类号】：P642.2

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