涪陵江东边坡治理方案有限元分析

Finite Element Analysis of Slope Treatment Scheme in Eastern Fuling River

边坡失稳易导致山体滑坡,抗滑桩被广泛应用于边坡治理工程中。依托于涪陵江东边坡治理工程,结合群桩承台基础、扶臂式挡墙及斜坡护岸结构体系对边坡进行治理。选取典型剖面建立计算模型,采用有限元程序CORE3D针对边坡在结构体系作用下的变形与稳定性进行了计算,对比分析了4排桩与5排桩体系作用下滑坡体与抗滑桩的变形与受力特性,为工程实践提供参考。研究结果表明:与5排桩结构体系相比,4排桩体系作用下边坡、挡墙的竖向与水平向位移较大;抗滑桩最大主拉应力与压应力亦较大。抗滑桩表现出明显的“S形”变形,并形成土拱效应。滑坡体单宽推力自后缘起逐渐增加,至抗滑群桩前推力达到峰值。推荐采用4排桩方案,注意在节点处加强纵向受力钢筋与箍筋作用。

Slope instability is easy to cause landslides, and anti-sliding piles are widely used in slope treat-ment. Based on the slope treatment project of the eastern Fuling River, the slope was treated by the system which coupled the pile groups, retaining wall and the slope revetment structure. The calculation model of the typical profile was established, and the finite element program CORE3D was used for calculating the deformation and stability of slope, and the deformation and stress characteristics of landslide and anti-sliding piles were compared between 4 piles and 5 piles sys-tem, which provide a reference for engineering practice. The results show that compared with the 5 piles system, the vertical and horizontal displacement of the slope and the retaining wall of the 4 piles system were larger, and the main tensile stress and compressive stress of anti-sliding pile were larger too. The anti-sliding piles showed “s-shaped” deformation, and the soil arching effect was formed. The single wide thrust of the slope increases gradually from the post, and attained the peak before the anti-sliding piles. It is recommended that 4 pile system is better, and the longitudinal rebar and stirrup at the nodes should be reinforced..