【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。更多还原

【Abstract】 Due to the concentrated joints and developed fracture of loess,earthquake happened in the loess area 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 concentrated 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% probability of exceedance in 50 years,body collapses in Xianyang city are prone to failure.更多还原