抗滑结构对渠坡增稳效应的有限元分析

Finite Element Analysis of Effects of Anti-sliding Structures on Canal Slope Stabilization

采用有限元强度折减法,对南水北调工程某渠坡在仅考虑重力荷载作用下进行了三维有限元稳定性计算,讨论了衬砌、抗滑桩等抗滑措施对渠坡的增稳效果,对渠坡稳定计算中抗滑结构与土体之间有无接触进行了对比分析.结果表明:衬砌明显提高了渠坡的抗滑稳定性,而抗滑桩的增稳效果不明显,原因在于抗滑桩并没有阻断塑性贯通区;抗滑结构与土体土之间考虑接触后,渠坡稳定安全系数明显降低,塑性贯通区表现出明显的变化,接触分析可以较为真实地反映抗滑结构和周围土体之间的接触效应.

Strength reduction FEM is used to calculate the stability of 3D FEM of the canal slope in the South-to-North Water Diversion Proj ect.The stabilization effects of lining and anti-slide piles,etc.are discussed. At the same time,the comparison of contact and non-contact are made in this canal slope stability calculation. The results show that the anti-sliding stability of this canal slope is improved obviously by using lining than u-sing anti-slide piles,for the plastic penetration area is not blocked by the piles.Safety coefficient decreases obviously when taking contact effect between anti-sliding structures and the soil into consideration,plastic transfixion area changes evidently;and the contact effect of anti-sliding structure-soil can be truly reflected by the contact analysis.