寒区路堤边坡稳定性的力学分析

区路堤边坡,特别是由冻结的砾石填筑的路堤或含冻结的砂砾层的路堤边坡的破坏准则具有极高的非线性.假定冻土为理想弹塑性体,且符合相关联的流动法则,基于极限分析的上限理论,对非线性破坏准则的寒区路堤边坡稳定性问题,提出了一个既考虑了相关的非线性效应,又易于工程计算,且不失必要分析精度的实用方法.在实际工程应用时,可以利用已有的线性问题的分析结果或依据我们提出的方法使问题简化.

Mechanical Analysis on the Stability of Frozen Embankments

In many practical problems,such as the frozen gravel or the frozen gravel-fill embankments,it has been illustrated that the frozen porous material obeys a highly non-linear failure criterion.Based on the upper bound theory of limit equilibrium analysis,a formula is obtained for the plastic work rate that takes place in a frozen embankment consisting of a perfectly plastic material obeying the non-linear failure criterion with an associative flow rule in the plane strain regime.The non-linear failure criterion is reduced to a linear one that is the tangent line of the former in the stress space in order to simplify the procedure of the stability analysis.The advantage of the presented method lies in its incorporation of the related non-linear effects and yielding results of high accuracy with simple calculation procedure.The analyses indicate that the results for the slope stability obtained by using the linear failure criterion in the existing literatures can be applied to the cases with the nonlinear failure criterions in engineering practice.