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排土场比自然边坡要复杂的多,在稳定性评价中有必要利用多种方法共同分析。采用FLAC3D方法和刚体极限平衡法对某排土场进行稳定性评价。极限平衡法计算结果表明,排土场在地震工况下存在沿面滑动的可能性;FLAC3D方法模拟结果表明,排土场整体处于基本稳定状态,但是局部在降雨和地震工况下均有发生沿面滑动的危险性。分析结果的差异性是因为FLAC3D评价的是排土场整体的稳定性,而刚体极限平衡法计算的只是可能滑动面上的稳定性系数,并且在计算过程中无法考虑土体应力应变关系。极限平衡法通过简单计算就能得到排土场稳定性系数,但是不能反映排土场破坏过程;FLAC3D方法能直观反映出排土场破坏机制但是其计算边界的确定和单元网格的划分均有很大的随意性,给后续工作带来一定难度。所以在复杂排土场稳定性评价过程中有必要同时利用两种方法共同分析。
Dumps are more complicated than natural slopes, and it is necessary to use multiple methods in the stability assessment. Using FLAC3D method and rigid body limit equilibrium method to evaluate the stability of a dump. The results of the limit equilibrium method show that there is a possibility of surface slip in the dumping site under seismic conditions. The simulation results of FLAC3D show that the dumping site is in a basically stable state, but the occurrence of local creeping surface under rainfall and earthquake conditions Danger of sliding. The difference between the analysis results is that FLAC3D evaluates the overall stability of the dump, while the rigid body limit equilibrium method only calculates the stability coefficient of the sliding surface, and the soil stress-strain relationship can not be considered in the calculation. The limit equilibrium method can get the stability coefficient of the dump site by simple calculation, but it can not reflect the dumping process. The FLAC3D method can directly reflect the dump site failure mechanism but the calculation boundary and the grid division are A lot of randomness, to the follow-up work to bring some difficulty. Therefore, it is necessary to analyze both the two methods in the process of complex dumping site stability evaluation.