粘性河岸稳定性计算模型对比

Comparison of Calculating Models of Cohesive Riverbank Stability

在考虑了孔隙压力与静水压力的前提下 ,经适当优化提出了三个典型粘性河岸稳定性计算模型 ,并用这三个计算模型对一实测河岸稳定性进行了计算对比 .结果表明 ,对天然河岸而言 ,简化模型比较简单、实用 ,但精度稍差 ;采用概率模型可较好地预测河岸崩塌后的形态 ;采用分层模型计算精度更高 ,但计算量相对较大 .三模型均适用于以类似于平面崩塌方式发生崩塌的粘性河岸的稳定性计算 .

In this paper, by taking the pore water pressure and the hydrostatic confining pressure into consideration, three typical calculating models of cohesive riverbank stability were presented via suitable optimization and were then applied to a practical stability measurement. The corresponding results were finally compared, with the conclusion that, for natural riverbanks, the predigesting model is simpler and more applicable, but is less precise, while for the prediction of riverbank shape after failure, the probability model is better, and the precision of the layered model is the highest in the three models, although its calculating load is the greatest. These three models are all applicable to the stability calculation of cohesive riverbanks with a plane-like failure.