旋喷桩加固新建桥墩软基稳定性分析

新建丽香铁路某大桥桥墩软土地基,采用旋喷桩对其加固。用极限平衡法分别对大桥#8,#9桥墩软土地基加固前后的稳定性进行检算,同时运用FLAC3D构建三维地质模型,进行数值模拟,研究软土地基的应力及位移分布特征,分析评价软基稳定性;结果表明:采用旋喷柱加固该大桥桥墩软基的措施是可行、有效的。

Stability Analysis of Chemical Churning Pile-reinforced Soft Foundation of New Pier Adjacent to Existing Highway

Due to its safety problem, the soft soil of the existing highway adjacent to a bridge of Lijiang-Shangrila nyilha Railway is reinforced by chemical churning piles, and the stability is respectively verified for the piers #8 and #9 before and after reinforcement of the soft soil prier foundation of the bridge in a limit equilibrium method to evaluation the stability of the soft soil foundation after the reinforcement; a 3D geologic model is established based on FLAC3D platform to numerically simulate stress. After replacement of the equivalent soil layer with the chemical churning piles, the stress and displacement distribution characteristics of the soft soil foundation is researched to analyze and evaluate slope stability; meanwhile, the method and program for calculation and analysis of the stability of the soft soil foundation based on FLAC3D numerical computation software is proposed, that is to say, 3D numerical simulation is performed to better calculate the stability of the soft soil foundation, and intuitively reflect the stress distribution of geologic body.