黄土崩塌体的地震稳定性评价——以陕西咸阳为例  

Evaluation on Seismic Stability of Loess Landslide Body——Taking Shaanxi Xianyang as an Example

作　　者：聂忠权[1,2] 范文[1] 陈党民[3] 刘玉洁[2] 

机构地区：[1]长安大学地质工程与测绘工程学院,陕西西安710054 [2]四川交通职业技术学院,四川成都611130 [3]陕西省地震局,陕西西安710068

出　　处：《灾害学》2014年第4期93-97,共5页Journal of Catastrophology

基　　金：国家自然科学基金项目(40972181);国家自然科学基金项目(41302251);陕西省自然科学基金项目(2013JQ5005);长安大学中央高校基金项目(2013G3262011);陕西省咸阳市防震减灾"十一五"重点项目之一"咸阳市地震小区划项目"

摘　　要：由于黄土节理密集、裂隙发育,地震在黄土分布区往往诱发大量大规模的崩滑灾害。为了查明咸阳市崩塌体的地震稳定性,采用现场调查和统计分析方法,查明了咸阳市崩塌地质灾害受构造和地震作用控制,主要发育在黄土陡崖地带,呈带状分布于渭河二级阶地后缘与三级阶地前缘交接处,具有在特定区域范围内群发的空间分布特征;而且,多集中发生于每年的7-9月份,还具有雨季周期性突发的时间分布特征;经力学分析和"块体平衡理论"计算得知,在50年超越概率2%的情况下,咸阳市区的崩塌体容易发生失稳破坏。Due to the concentrated joints and developed fracture of loess,earthquake happened in the loess ar-ea often causes large-scale landslides.Field survey and statistical analysis methods are used to find out the seismic stability of the collapse in Xianyang city.It is shown that disasters are controlled by tectonic and seismic effects, mainly developed in loess cliffs zone.It distributed at the trailing edge of Weihe two terraces and three terrace edge junction with the spatial distribution characteristics of group in the specific region.Most of the disasters concentrat-ed occurred in July to September of each year and are of statistical distribution characteristic as periodic burst in rainy season.According to mechanical analysis and calculation by Mass Balance Theory,in the case of 2%proba-bility of exceedance in 50 years,body collapses in Xianyang city are prone to failure.

关 键 词：地震地质灾害 崩塌 地震 稳定性评价 块体平衡理论 黄土 陕西省咸阳市 

分 类 号：P642.22[天文地球—工程地质学] X43[天文地球—地质矿产勘探]