Kettleman Hills填埋场三维稳定性极限上限分析

发布时间：2019-03-25 15:00

【摘要】：1988年3月失稳破坏的美国Kettleman Hills填埋场是一个典型的复杂"山谷"型填埋场,众多学者研究表明仅采用二维截面分析难以对该填埋场整体稳定性进行评价。目前Kettleman Hills填埋场三维稳定性分析多采用极限平衡法,但是由于极限平衡法对破坏模式没有严格的要求(如速度相容),无法确定其所得到的解是偏于安全还是偏于危险,甚至不能确定该破坏模式是否合理。因此本文基于极限分析上限法,构造二维、拟三维及三维破坏机构进行分析,并通过与已有的文献及数值模拟结果进行对比验证方法的合理性及有效性。分析表明,二维和拟三维破坏机构类似,构建容易计算方便,适用于填埋场初步快速分析。而三维多个块体破坏机构构建复杂,计算量大,但能够反映实际填埋场的破坏情况,适用于填埋场的详细稳定性分析。
[Abstract]:The United States Kettleman Hills landfill, which failed in March 1988, is a typical complex "valley" landfill. Many scholars have shown that it is difficult to evaluate the overall stability of the landfill by two-dimensional cross-section analysis. At present, the limit equilibrium method is mostly used in the three-dimensional stability analysis of Kettleman Hills landfill. However, because the limit equilibrium method has no strict requirements on the failure mode (such as velocity compatibility), it is impossible to determine whether the solution obtained by the method is too safe or dangerous. It is not even certain whether the failure pattern is reasonable. Therefore, based on the upper limit method of limit analysis, two-dimensional, quasi-three-dimensional and three-dimensional failure mechanisms are constructed, and the rationality and effectiveness of the method are verified by comparing with the existing literature and numerical simulation results. The analysis shows that the two-dimensional failure mechanism is similar to the pseudo-three-dimensional one, and it is easy to calculate and suitable for the preliminary and rapid analysis of landfill site. However, the construction of three-dimensional block failure mechanism is complex and the calculation is large, but it can reflect the failure of actual landfill, and it is suitable for the detailed stability analysis of landfill site.
【作者单位】：同济大学地下建筑与工程系;同济大学岩土及地下工程教育部重点实验室;上海市城市建设设计研究总院;
【基金】：国家重点基础研究发展计划(973计划)课题项目(2012CB719803)
【分类号】：TU43;TU993

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