地裂缝场地地脉动响应特征初探——以西安F_6地裂缝为例  

PRELIMINARY RESEARCH ON DYNAMIC RESPONSE CHARACTERISTICS OF MICROTREMOR AT GROUND FISSURE SITES——ILLUSTRATED WITH F_6 GROUND FISSURE IN XI'AN

作　　者：张磊刚[1] 邓亚虹[1,2] 薛捷[1] 王晗[1] 刘庆[1] 杨洋[1] 

机构地区：[1]长安大学地质工程系,西安710054 [2]国土资源部岩土工程开放研究实验室,西安710054

出　　处：《工程地质学报》2017年第3期784-793,共10页Journal of Engineering Geology

基　　金：国家自然基金项目(41372327);国土资源部公益性科研专项(201411096-02)资助

摘　　要：地裂缝灾害是西安市主要的环境地质灾害问题,严重地制约着城市建设用地的有效利用和规划。为研究地裂缝对场地动力响应的影响,本文以西安F_6地裂缝场地为研究对象,基于现场地脉动测试及其频谱分析,分析了地裂缝场地地脉动响应的加速度幅值、卓越频率、放大效应等动力响应特征。研究表明,测试场地卓越频率大小与测点位置无明显关系,其中傅里叶谱卓越频率为2.79Hz左右,反应谱卓越频率为4.17Hz左右;靠近地裂缝区域,场地动力响应具有明显放大效应,上下盘影响范围基本一致,约为15m左右;地裂缝上盘放大倍数大于下盘,其中傅里叶谱峰值放大倍数分别为1.92和1.81,反应谱峰值放大倍数分别为1.68和1.63。Ground fissure disaster is one of the main environmental geological hazards in Xi＇an,which influence the using and planning of land in the urban construction. In order to research the characteristics of the dynamic effects of ground fissures,this paper chooses the F6 ground fissure site as the research object. After finishing the field test and the spectrum analysis of micro-tremors, we analyze the acceleration amplitude, excellent frequency,amplification effect and other dynamic response characteristics of the ground fissures. The research shows that there is no obvious relationship between the frequency of the test site and the position of the measuring point. The excellent frequency of the Fourier spectrum is around 2. 79 Hz,and the excellent frequency of the response spectrum is around 4. 17 Hz. Nearby the ground fissure region,the dynamic response of ground fissure site has obviousamplification effect. The influence range of hanging wall and footwall is around 15 m. The amplification factor of hanging wall is greater than that of footwall,in which the amplification ratios of the Fourier peak are 1. 92 and1. 81,the amplification ratios of the response spectrum peak are 1. 68 and 1. 63.

关 键 词：地裂缝 地脉动 频谱分析 放大效应 

分 类 号：P642[天文地球—工程地质学]