汶川地震诱发滑坡与地震动峰值加速度对应关系研究  

RESEARCH ON RELATIONSHIP BETWEEN LANDSLIDES AND PEAK GROUND ACCELERATIONS INDUCED BY WENCHUAN EARTHQUAKE

作　　者：王秀英[1] 聂高众[2] 王登伟[3] 

机构地区：[1]中国地震局地壳应力研究所,北京100085 [2]中国地震局地质研究所,北京100029 [3]四川省地震局西昌地震中心台,四川西昌615022

出　　处：《岩石力学与工程学报》2010年第1期82-89,共8页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(40872209)

摘　　要：利用汶川地震获得的地震动记录及峰值加速度数据和收集整理的近3000个崩滑点数据,对汶川地震诱发滑坡与地震动峰值加速度之间的对应关系进行研究,得到如下认识:(1)地震动峰值加速度与地震诱发崩滑之间存在非常明显的正相关性,随峰值加速度增加,地震滑坡灾害也逐渐严重。(2)在龙门山震区存在0.2g的峰值加速度分界线,大于此值时,地震滑坡灾害比较严重。(3)整个区域峰值加速度的下限为0.05～0.07g,小于此值时,诱发滑坡的可能性很小。(4)不同地质区域对应斜坡临界加速度有所不同,一般在0.05～0.15g之间变化,平均为0.1g,说明震区斜坡承受地震的水平较差;峰值加速度超过局部场地斜坡临界加速度后,诱发滑坡的可能性增加。得到的峰值加速度研究结果与其他研究结果较为一致,表明利用地震动参数研究地震滑坡具有很好的一致性。依据峰值加速度与地震滑坡的对应关系,可以对震后滑坡灾害作快速评估,也可以将其应用到地震滑坡灾害预测/区划工作中,与地震动峰值加速度区划形成很好的衔接。Based on the data of strong motion records of the corresponding peak ground acceleration（PGA） and data collected from almost 3 000 landslides induced by Wenchuan earthquake, the studies of earthquake-induced landslide and PGA are carried out and some conclusions are obtained as following： （1） There is a positive correlation between PGA and earthquake-induced landslides, and the higher the PGA is, the more serious the earthquake-induced landslides hazards are. （2） A 0.2 g PGA boundary is shown in the regional scale analysis in Longmenshan area; and earthquake-induced landslides hazards are more serious in the locations where PGAs are greater than this value. （3） The lower limit of PGA which can trigger landslides is 0.05 - 0.07 g, and there is rarely opportunity to induce landslides when PGA is less than this threshold. （4） Different critical accelerations are presented in different strata with the variation ranging from 0.05 g to 0.15 g; and the average PGA is about 0.1 g, which shows the slopes＇ proneness to earthquake excitation in the disaster areas. When PGA exceeds the critical acceleration of the local site, the probability to trigger landslide will increase. Results achieved from this study are in accord with results of other researchers, which gives a good consistency when earthquake-induced landslide is measured by ground motion parameters. The relationship between PGA and earthquake-induced landslide can be used to evaluate earthquake-induced landslides hazards quickly. Moreover, it can be applied to the work of earthquakeinduced landslide forecasting or zonation, in which the achievement of PGA zonation can be adopted with the practical application.

关 键 词：边坡工程 汶川地震 地震滑坡 峰值加速度 触发下限 临界加速度 

分 类 号：P642.22[天文地球—工程地质学]