汾渭盆地典型地裂缝动力场地效应对比研究

Fenwei Basin is one of the typical area with most developed, destructive and reginal ground fissrures in China and even the world. The reserach on the dynamic response characteristics and reasonable engineering protection distance and seismic fortification criterion of ground fissure sites is always the weakest segment in ground fissure study. Based on the previous works on ground fissure investigation, exploration and mechanism research in Fenwei Basin, systematic microtremors testing and analysis will be made for selected typical ground fissrues. Combined with numerical analysis rsults of site's ground motion response, the dynamics response feature, influence factor, ground motion amplification effect, influence scope, engineeering protection distance and seismic fortification criterion of ground fissure sites will be revealed and proposed, and will provide technical support to disaster prevention and mitigation of similar sites.

汾渭盆地是我国乃至全世界地裂缝最为发育、破坏性和区域性最强的典型地区之一。有关汾渭地区地裂缝场地的动力响应特征以及场地工程建设的合理避让距离和抗震设防标准一直是地裂缝研究的薄弱环节。本项目在前期汾渭盆地地裂缝调查、勘探和成因机理研究等工作基础上，选取典型地裂缝开展系统的地脉动测试及其分析工作，结合场地地震动响应数值分析结果，揭示汾渭盆地典型地裂缝场地的动力响应特征和影响因素，揭示地裂缝场地的地震动“放大效应”和“影响范围”，提出地裂缝场地工程建、构筑物的合理避让和合理抗震设防标准，为类似场地的工程防灾减灾提供技术支撑。

汾渭盆地是我国乃至全世界上地裂缝最为发育、破坏性和区域性最强的典型地区之一。有关汾渭地区地裂缝场地的动力响应特征以及场地工程建设的合理避让距离和抗震设防标准一直是地裂缝研究的薄弱环节。本项目在前期汾渭盆地地裂缝调查、勘探和成因机理研究等工作基础上，选取了31条典型地裂缝开展系统的地脉动测试及其分析工作。结合地脉动分析结果和场地地震动响应数值分析结果，揭示了汾渭盆地典型地裂缝场地的动力响应特征和影响因素，揭示了地裂缝场地的地震动“放大效应”和“影响范围”。依据地裂缝场地地下隧道、地铁车站和地表框架结构的常见结构动力响应分析，进一步提出了地裂缝场地工程建、构筑物的合理避让和合理抗震设防标准，并为类似场地的工程防灾减灾提供技术支撑。