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填埋场的沉降和容量分析对其填埋期及封场后的运营有着重要意义。综合比较了不同的填埋场沉降分析模型,总结了各种填埋体压缩试验和现场沉降监测结果。如果生物降解被抑制,蠕变引起的压缩量相对较小,大部分力学压缩将在较短时间内完成;完善并改进了生物降解压缩模型,并通过案例分析与现场孔隙比沿深度的变化进行了比较。该模型能用于描述常压力下的试样压缩,也能分析分层堆填填埋场的容量分析和封场后沉降,尤其适用于降解条件适宜的情况。模型中采用的参数可以通过压缩试验或反分析沉降资料的方法获得。通过案例分析发现,改善填埋期间填埋体的降解条件能够有效地提高填埋场的容量,减少封场后沉降的潜力。如果不考虑填埋过程、填埋高度、初始有机质含量、填埋场降解条件,即使有了一定的沉降观测资料,单纯采用经验公式去分析封场后沉降也并不合理。
Landfill settlement and capacity analysis are of great significance for the landfill and post-closure operations. Different landfill settlement analysis models are compared and the results of various landfill compression tests and on-site settlement monitoring are summarized. If the biodegradation is inhibited, the compression caused by creep is relatively small, most of the mechanical compression will be completed in a relatively short period of time. The biodegradation compression model is improved and improved, and the case analysis is used to analyze the variation along the depth of the pore ratio A The model can be used to describe the sample compression under normal pressure, as well as to analyze the capacity of the stratified landfill and the subsidence after the landfill. It is especially suitable for the suitable degradation conditions. The parameters used in the model can be obtained by compressing the test or by inverse analysis of sedimentation data. Through case analysis, it is found that improving landfill degradation conditions during landfilling can effectively increase landfill capacity and reduce the potential for subsidence after landfill closure. If we do not consider the landfill process, landfill height, initial organic matter content and landfill degradation conditions, it is not reasonable to simply use empirical formulas to analyze the subsidence after closure.