地震诱发黄土滑坡的滑距估测

Slippage Estimation of the Loess Landslide Triggered by Earthquake

摘要:

认为用坡体波动振荡效应来解释地震滑坡的形成是合理的,地震动使坡体波动振荡产生的启程剧发速度会直接影响到滑后行程速度和整个滑动土体的滑移距离。最大滑距可分为地震时坡体波动振荡产生的位移和地震波动停止后滑坡的滑移距离两部分,先采用Newmark有限滑动位移分析模型计算前者的永久地震位移,再进一步计算后者。经海原地震滑坡实例计算,文中地震滑坡滑距计算公式实用有效。

Abstract:

It is a reasonable explanation that the slope mass vibrating process makes the slope deformed and failed during earthquake, and initial violent-slide velocity of the slope mass will affect the sliding velocity and all the slippage later. The maximum slippage could be divided into two parts for calculation, which are the slope displacement during earthquake vibration and the sliding distance after earthquake. The former will be computed by Newmark analytical method, and the later will be done further when permanent displacement has occurred. A landslide formed in Haiyuan earthquake in 1920 is taken as an example. The calculating result proves that the formulae are practical and effective.