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为研究渠河河堤跨河大桥桩基工程对河堤稳定性的影响,采用有限元方法对河堤边坡加固方案及施工过程进行稳定性计算分析。对渠河大桥处渠堤断面图进行概化,构建二维平面应变有限元计算模型;利用有限元强度折减法,借助PLAXIS软件实现对设计坝体加宽和桩基桩孔施工情况下边坡的稳定性分析。计算结果表明,当坝坡坡度调整为1.00∶3.00时,最小稳定安全系数达到1.179,满足规范要求值1.150;桩孔开挖过程中,边坡稳定安全系数均大于1.150,坝坡稳定性可以得到保证,但是桩孔孔壁存在渗透变形和塑性变形的安全隐患,需采取防护措施。
In order to study the influence of the pile foundation project of the canal river embankment bridge on the stability of the river embankment, the stability calculation and analysis of the reinforcement scheme and construction process of the river bank dike are carried out by using the finite element method. The section drawing of canal embankment at Canal Bridge is generalized and the two-dimensional plane strain finite element model is established. By means of finite element strength reduction method and PLAXIS software, Stability analysis. The results show that when the slope gradient is 1.00: 3.00, the minimum stable safety factor reaches 1.179, which meets the specification requirement of 1.150. During the excavation of the pile hole, the safety factor of slope stability is greater than 1.150, and the stability of the dam slope can be obtained However, there is a hidden danger of perforation and plastic deformation in the hole wall of the pile hole, and protective measures must be taken.