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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 U.S. Kettleman Hills Landfill, which was damaged by instability in March 1988, is a typical complex “valley” landfill. Many scholars have found that it is difficult to evaluate the overall stability of the landfill using only two-dimensional cross-section analysis . At present, the limit equilibrium method is mostly used in the three-dimensional stability analysis of Kettleman Hills landfills. However, the limit equilibrium method has no strict requirements (such as speed compatibility) on failure modes, so it can not be determined whether the solution it obtains is safer or biased , Can not even determine the damage mode is reasonable. Therefore, based on the upper bound method of limit analysis, this paper constructs two-dimensional, three-dimensional and three-dimensional destruction mechanism for analysis, and compares with the existing literature and numerical simulation results to verify the rationality and effectiveness of the method. The analysis shows that the two-dimensional and quasi-three-dimensional damage mechanism is similar, the construction is easy to calculate and is suitable for the preliminary rapid analysis of landfills. The three-dimensional multi-block failure mechanism is complex and has a large amount of calculation, but it can reflect the actual destruction of the landfill and is suitable for the detailed stability analysis of the landfill.