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尽管场地响应现象已是全球都公认的,然而对澳大利亚的许多地区,之前并没有研究过风化层属性对地震动的影响。为了描述风化层能改变地震动的特性,本文通过验证研究评估了为一级地震危害性和灾害风险评估的应用而编制的澳大利亚全国场地分类图。在缺乏风化层厚度和基本周期数据的情况下,场地类别根据在加利福尼亚研制的利用地质材料与地层上部30m的剪切波速度(VS30)的关系的方法进行归类。随后将这一分类方案调整到适合澳大利亚的地质环境,包括对这一稳定地质构造中通常碰到的原地风化表层土存在的校正。本文所得结果用纽卡斯尔、悉尼和珀斯市区各种第四纪沉积环境和横跨澳大利亚各种场地基岩优势环境的地球物理数据和岩土数据进行了验证。这些分析的结果说明了在地震危险性评估的场地类别中应用限定深度的剪切波速度方法的有效性,但同时也突出了局限性。
Although the response to the site response is recognized globally, the impact of the properties of the formation on the earthquake has not been studied in many parts of Australia. In order to describe the behavior of weathering layers that can alter ground motion, a validation of the study assessed the Australian site map compiled for the application of Level 1 seismic hazard and disaster risk assessments. In the absence of weathering layer thickness and basic period data, the site classification is based on a methodology developed in California that uses the relationship of geological materials to shear wave velocities (VS30) of 30 m above the top of the formation. The classification scheme was subsequently adapted to the Australian geological environment, including the correction of the in situ weathered topsoil normally encountered in this stable geological formation. The results obtained in this paper are validated by various Quaternary sedimentary environments in Newcastle, Sydney and Perth, and geophysical and geotechnical data of the dominant environments of bedrock across various sites in Australia. The results of these analyzes illustrate the effectiveness of applying depth-limited shear-wave velocity methods in the site classification of seismic hazard assessments, but also highlight the limitations.