基于Newmark法的设定地震滑坡危险性评估  

Assessment of landslide risk based on Newmark and preset earthquake

作　　者：林高聪 潘书华[1] 叶振南[1] LIN Gao-cong;PAN Shu-hua;YE Zhen-nan(Center for Hydrogeology and Environmental Geology Survey,China Geology Survey,Baoding 071051,China)

机构地区：[1]中国地质调查局水文地质环境地质调查中心,河北保定071051

出　　处：《桂林理工大学学报》2021年第3期525-532,共8页Journal of Guilin University of Technology

基　　金：中国地质调查局地质调查项目(DD20190639,12120114035501)。

摘　　要：基于野外调查和滑坡填图的成果,将评价单元划分为滑坡单元与栅格单元,赋予不同的滑块厚度及岩土体强度,开展滑坡易发性评价;结合历史地震重现的设定地震方法和地震动衰减经验公式对研究区场地地震危险性进行评价,利用Arias强度I_(A)、临界加速度a_(c)和滑块位移间的经验式计算滑坡体与斜坡体的累积位移量,实现对潜在震区地震诱发滑坡的危险性评价。结果表明,研究区河岸两侧及支沟与黄土地区为潜在地震作用下滑坡高危险区,局部已有处于稳定状态的滑坡单元在评价结果中显示出整体位移,可以反映出地震作用下滑坡的复活情况。在尚未开展局地-场地尺度的地震危险性区划时,可以采用Newmark模型结合设定地震法对潜在震区地震诱发滑坡进行危险性评价。In the past landslide risk assessment,little attention was paid to the assessment of existing landslide units.In the case of local scale and potential large earthquakes,there were few landslide risk assessments based on preset earthquakes.According to the survey results and landslides mapping,the evaluation unit is divided into landslide unit and grid unit,based on different strength parameters and slide thickness for the Landslide susceptibility assessment.Combined with the established seismic method and the empirical formula of ground motion attenuation,the seismic risk of the site in the study area was evaluated,and the cumulative displacement of the landslide and the slope was calculated by statistical relation of Arias intensity I_(A),critical acceleration a_(c)and slide block displacement,so as to realize the risk evaluation of the earthquake-induced landslide in the potential earthquake area.The results show that both sides of the river bank,branch ditch and loess area in the study area are high risk areas of landslide under potential earthquake action.Some landslide units in stable state show overall displacement in the evaluation results,which can reflect the revival of the landslide under the action of earthquake.The Newmark model can be used to evaluate the risk of the earthquake-induced landslide in the potential earthquake area in combination with the preset seismic method.

关 键 词：地震滑坡 设定地震 Newmark模型 滑坡单元 危险性 

分 类 号：P642.22[天文地球—工程地质学]