NUMERICAL SIMULATION OF CUIHUA ROCK AVALANCHE WITH DISCRETE ELEMENT METHOD
NUMERICAL SIMULATION OF CUIHUA ROCK AVALANCHE WITH DISCRETE ELEMENT METHOD
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发表时间：
2013
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通讯作者：
Wang Genlong
中科院分区：
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作者：
Wang Genlong
地质遗迹景观调查是城市地质工作的重要内容。翠华岩石雪崩是中国地震雪崩的奇观。基于动力离散元法，模拟了典型自然地震荷载作用下结构的动力响应和破坏过程。通过数值模拟再现了翠化岩崩的破坏过程。得到如下结果：首先，速度和加速度的放大效应是地震惯性力产生的原因。斜坡顶部的放大系数最大可达2.0。其次，高速度、长落差是岩崩的特点。结果表明：岩崩前缘最大水平速度可达44m·s-1，部分岩石水平移动距离达460m；第三，整个失效过程包括启动阶段、加速阶段、减速阶段和积累阶段四个阶段。
It is very important to investigate geological relics landscapes for urban geological work.The Cuihua rock avalanche is a marvellous spectacle of seismic avalanches in China.Based on dynamic discrete element method,the dynamic response and failure process are simulated under a typical natural earthquake loading.The failure process of Cuihua rock avalanche is reproduced with the numerical simulation.The following results are obtained.Firstly,the amplification effect of velocity and acceleration is the reason of earthquake inertia force.The maximum magnification factor reaches 2.0 on the top of slope.Secondly,high speed and long run out are the characteristic of the rock avalanche.The results shown the maximum horizontal velocity reaches up to 44m·s-1 and the horizontal movement distance for some rocks reaches 460m at the front of the rock avalanche.Thirdly,the whole failure process include four stages: starting up stage,accelerating stage,decelerating stage and accumulation stage.