利用强震记录分析汶川地震诱发滑坡

 根据Newmark方法提出一种在已知强震记录和滑坡数据的情况下，推导斜坡临界加速度的方法。采用这种方法，利用汶川地震中理县的3组强震记录数据和地震滑坡数据，得到沙坝台，桃坪台，木卡台附近区域的临界加速度估计值分别为40，50和70 gal。计算结果与灾区实际比较脆弱的地质情况一致。斜坡临界加速度可以作为利用地震动参数判定斜坡在地震作用下是否破坏变形的定量依据，为地震滑坡的定量研究提供一种思路。利用所提出的方法和汶川地震得到的大量强震记录，对龙门山地区的临界加速度进行评估，为震后恢复重建中的工程应用和地震滑坡灾害预测、区划工作提供定量参考信息。研究方法和结果有助于推动我国地震滑坡的定量化研究。

ANALYSIS OF LANDSLIDE INDUCED BY WENCHUAN EARTHQUAKE BY STRONG MOTION RECORDS

Based on the Newmark analysis,a method is introduced to deduce critical acceleration with the data of strong motion records and landslides. With this method,critical accelerations are calculated with the data of earthquake-induced landslide and strong motion records obtained from 3 stations in Lixian County during Wenchuan earthquake. The estimated critical accelerations of Shaba,Taoping and Muka stations are 40,50 and 70 gal respectively. The results are in accord with the vulnerable geologic situations in the earthquake-hit area. The critical acceleration can be regarded as a quantitative criterion for judging the failure strain of a slope under earthquake excitations by ground motion parameters. It provides a new way to study earthquake-induced landslides with quantitative method. With the recommended method and the large number of strong motion records obtained from Wenchuan earthquake,critical accelerations in the Longmenshan region can be estimated;and it can provide quantitative reference information for the reconstruction work such as the engineering application,earthquake-induced landslides forecasting and localization in the earthquake-hit region. The research method and its results are helpful to promote the quantitative research on earthquake-induced landslides in China.