G213线都江堰～映秀段边坡崩塌统计分析

Study and Analysis of Statistical Law of Slope Collapse Based on the Dujiangyan to Yingxiu Section of National Highway G213

基于实测数据对Zhao模型进行修正,得到汶川地震衰减模型。通过MATLAB编程计算了G213线都江堰～映秀段公路边坡崩塌工点的峰值加速度,并对崩塌工点的数据进行统计分析,得出以下结论：（1）崩塌方量V与崩塌深度H间存在明显的正相关关系、相关系数R^2=0.868,lgV与lg H相关系数R^2=0.736、也存在较明显的相关关系;（2）崩塌方量和崩塌深度主要由岩体的性质所决定,与峰值加速度不存在明显相关关系;（3）崩塌灾害点数目N与地震峰值加速度PGA存在显著的指数正相关关系,其相关系数R^2=0.923;（4）地震作用下硬质岩最容易发生崩塌失稳。

The Zhao attenuation model is modified based on measured data of Wenchuan earthquake,and peak acceleration PGA for slope collapse hazard point which is located on the state highway G213 from Dujiangyan to Yingxiu section is computed by program.After that,some conclusions are drawn from Statistical Analysis：（1）There is a positive correlation between collapse volume V and collapse depth H,the correlation coefficient R^2=0.868 and for the correlation coefficient between lgV and lgH,R^2=0.736,which also has a comparatively positive correlation;（2）Volume and depth of collapse induced by Wenchuan earthquake are mainly decided by the properties of rock mass itself,and there is no obvious correlation with the peak acceleration;（3）There is obvious exponential relationship between the number of collapse N and the seismic peak acceleration of PGA,the correlation coefficient R^2=0.923;and（4）It is most likely to collapse for the rock mass under the action of earthquake when the lithology of rock is hard.