In-Situ Shear Wave Velocity Measurements at Municipal Solid Waste Landfill Facilities

1993年10月9日生效的《资源保护和回收法》副标题D为城市固体废物填埋设施规定了新的最低设计标准；要求对这些设施进行设计，以适应250年内超过10%的峰值水平地面加速度。MSWLF的地震响应研究很少，认识也很差。对于工程师来说，在强烈的地面震动中这些设施的性能几乎没有指导。随着这些联邦标准的引入，垃圾填埋场的抗震设计变得越来越重要。该项目的目的是利用表面波频谱分析（SASW）技术，在洛杉矶盆地的6个MSWLF站点测量25至30米深度的小应变剪切波速剖面。选择这些地点是为了提供在实践中可能遇到的条件的代表性范围。SASW是一种非侵入式地球物理测量技术，非常适合用于垃圾填埋场，因为它消除了传统的跨孔和井下剪切波速测量所需要的与土壤钻孔相关的健康和安全问题。在这项研究中，将使用一种独特的大质量控制表面波源光谱分析（CSSASW）设备。本研究项目所得到的横波速度曲线将为工程师和科学家分析MSWLF的地震反应提供宝贵的帮助。

Subtitle D of the Resource Conservation and Recovery Act (RCRA), effective 9 October 1993, sets new minimum design standards for Municipal Solid Waste Landfill Facilities (MSWLF); requiring design of these facilities for a peak horizontal ground acceleration with a probability of exceedance of 10 percent in 250 years. The seismic response of MSWLF has received very little study and is poorly understood. Little guidance is available for an engineer on the performance of these facilities during strong ground shaking. With the introduction of these Federal standards, the seismic design of landfills has taken on increased significance. The objective of this project is to measure insitu the small strain shear wave velocity profile at MSWLF to depths of 25 to 30 meters, at 6 MSWLF sites in the Los Angeles basin, using the spectral analysis of surface waves (SASW) technique. The sites are chosen to provide a representative spectrum of the conditions likely to be encountered in practice. SASW is a non-intrusive geophysical measurement technique which is ideal for use at landfills, as it eliminates the health and safety problems associated with the soil borings required for conventional cross hole and down hole shear wave velocity measurements. For this research, a unique large mass Controlled Source Spectral Analysis of Surface Waves (CSSASW) device will be used. The shear wave velocity profiles that result from this research program will be an invaluable aid to engineers and scientists analyzing the seismic response of MSWLF.