Seismic Performance of Solid Waste Landfill

1993年10月9日，新的联邦城市固体废物填埋设施最低设计标准（MSWLF）发布，这对填埋设施的抗震设计产生了影响。然而，这些新标准结合了很少的信息，几乎没有建立垃圾填埋场抗震性能的指导方针。1994年1月17日，北岭地震首次记录了OII垃圾填埋场的强加速度，这是美国唯一一个装有强震记录仪的垃圾填埋场，因此提供了一个难得的机会来分析记录良好的案例历史，并制定垃圾填埋场的抗震性能指导方针。本研究的目的是分析1994年北岭地震后OII堆填区的强震记录和实测位移。几种类型的动力分析将用于计算地面加速度和永久地面位移。具体目标是确定模拟垃圾填埋场响应的垃圾填埋材料的波速和阻尼特性。这些反向拟合数据将与地球物理和表面波测量技术测量的波速进行比较，以评估波速测量在极端非均质介质中的适用性。分析方法将包括传统的工程方法（如等效线性方法，如QUAD4）和更先进的塑性模型和有限元模型，如LINOS。综合模型将被开发，包括垃圾填埋材料的非线性行为，二维几何，和波的传播和反射。本文将提出监测堆填区抗震性能的最佳方法。在这项研究中收集和产生的数据将以数字格式存入南加州大学南加州地震中心的数据库。＊＊＊

9416240 Hushmand On October 9, 1993, new Federal minimum design standards for Municipal Solid waste landfill Facilities (MSWLF) were released which impacted the seismic design of landfills. However, these new standards combined little information and almost no guidelines for establishing the seismic performance of landfills. On January 17, 1994, the Northridge earthquake provided the first recorded set of strong accelerations in the OII landfill, the only landfill in the United States which is instrumented with strong-motion recorders, thus providing a rare opportunity to analyze a well-documented case history, and to develop guidelines for the seismic performance of landfills. The objective of the proposed research is to analyze the strong motion recordings and the surveyed displacements at the OII landfill after the 1994 Northridge earthquake. Several types of dynamic analyses will be used to calculate the ground accelerations, and the permanent ground displacements. The specific objectives are to determine the wave velocity and the damping properties of landfill materials that simulate the landfill response. These backfitted data will be compared to the wave velocities that are measured from geophysical and surface wave measurement techniques, in an effort to assess the applicability of the wave velocity measurements in extremely heterogeneous media. The method of analysis will include conventional engineering methods (e.g. equivalent linear methods such as QUAD4) and more advanced plasticity models and finite element models such as LINOS. Comprehensive models will be developed that include nonlinear behavior of landfill materials, two dimensional geometries, and wave propagation and reflection. Recommendations will be made for the optimal way to monitor the seismic performance of landfills. The data collected and generated during this research will be in digital format to the database of the Southern California Earthquake Center at the University o f Southern California. ***