双排抗滑桩桩顶连接方式的优化设计

 采用有限元程序ANSYS建立双排抗滑桩有限元模型，分析桩顶连接方式对抗滑桩的侧向位移分布和内力分布的影响，找出最优的桩顶连接方式。桩顶的连接方式可分为无连接、同排相连、前后排相连和全连接等4种方式。通过对比这4种桩顶连接方式可知，前后排相连和全连接均可以使双排抗滑桩的变形相协调，弯矩和剪力分布更加的合理，能更好地发挥前后2排桩的抗滑效果，但是全连接增加抗滑桩的成本。选取同排相连和前后排相连2个工程实例，监测分析发现，同排相连时前排桩的侧向位移和弯矩均远小于后排桩，前后排相连时前后2排桩的位移和弯矩比较接近，这与有限元分析结果相吻合。在双排抗滑桩的设计中，建议采用前后排相连的桩顶连接方式。

OPTIMIZATION DESIGN OF CONNECTION METHODS OF DOUBLE-ROW ANTI-SLIDE PILES TIP

Based on the finite element program ANSYS，a finite element model with double-row anti-slide piles was established. The piles tip connection methods for the lateral displacement are analyzed，including bending moment and shear stress of piles，and the optimal piles tip connection. Piles tip connection methods include no connection，the row connection，the front-and-back rows connection and all connection. Compared with the four methods，it can seen that the front-and-bank rows connection is optimal. Using the front-and-bank rows connection and all connection methods，the double-row piles have better anti-slide effect. But using the all connection，the cost of anti-slide piles will increase. Two engineering examples which are respectively the row connection and the front-and-back rows connection，are simulated. Through monitoring and analysis of the stresses and displacements of the piles，it is found that the results are consistent with that of finite element analysis. So the front-and-bank rows connection of piles tip joint in the design can be suggested.