论文部分内容阅读
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。“,”The Kettleman Hills landfill, which had a slope-stability failure in March 1988, is a typical complex (“Valley”type) landfill, and the two-dimensional analysis is difficult to evaluate its stability. At present, the limit equilibrium method is mostly adopted in the three-dimensional stability analysis of the Kettleman Hills landfill. However, since the conduction of the failure mode does not need to satisfy the strict conditions (kinematically admissible), it is unable to identify whether the results are safe or risky, and even whether the failure mode is reasonable. Thus, based on the upper-bound limit analysis method, the two-dimensional, quasi-three-dimensional and three-dimensional failure mechanisms are conducted and verified though the comparisons with the results of the existing literatures and numerical simulations. The two-dimensional and quasi-three-dimensional failure mechanisms are similar and easy to conduct, so they are convenient for rapid preliminary stability analysis of the landfill. The three-dimensional multiple-block failure mechanism is difficult to conduct and needs large computation, but it can reflect the actual destruction of the landfill and is suitable for a detailed analysis of the landfill.