深基坑支护桩竖向横撑设计方案优化研究  

Optimization Study on the Design Scheme of Vertical Cross Bracing of Deep Foundation Support Pile

作　　者：杨吉新[1] 黄小刚 YANG Jixin;HUANG Xiaogang(School of Transportation and Logistics Engineering,Wuhan University of Technology,Wuhan 430063,China)

机构地区：[1]武汉理工大学交通与物流学院,武汉430063

出　　处：《武汉理工大学学报（交通科学与工程版）》2023年第4期699-704,共6页Journal of Wuhan University of Technology（Transportation Science & Engineering）

摘　　要：针对深基坑支护体系中的横撑在竖直方向上的布置数量过于富余从而造成工程成本、工期以及施工难度增加的问题进行支护体系优化研究.采用朗肯土压力模型,求解支护桩内、外侧所受到的地基反力与主动土压力,对支护桩进行单元划分,建立支护桩单元水平方向平衡微分方程,利用有限差分法求解桩身在任何一种横撑布置情况下的桩身水平位移,利用Java语言编程,循环求解横撑在支护桩竖直方向上的最优布置方案.结果表明:原设计优化后,可以减少一层横撑的架设,采用在桩顶冠梁处架设一根钢支撑和距离桩顶7.43 m处架设第二根钢支撑的方案,优化后的桩身最大水平变形是原设计的0.59倍.若不减少钢支撑层数,可采用在桩顶冠梁处以及距离桩顶4.68和10.17 m处进行横撑的架设,优化后的桩身最大水平变形是原设计的45%.Rankine earth pressure model was used to solve the foundation reaction and active earth pressure on the inside and outside of retaining piles,and the retaining piles were divided into elements,and the horizontal equilibrium differential equation of retaining piles was established.The finite difference method was used to solve the horizontal displacement of the pile under any kind of cross brace arrangement,and then the Java language was used to program and solve the optimal arrangement scheme of the cross brace in the vertical direction of the supporting pile circularly.The results show that after the original design is optimized,the erection of a horizontal brace can be reduced.The scheme of erecting a steel support at the crown beam of the pile top and a second steel support at a distance of 7.43 m from the pile top is adopted.The maximum horizontal deformation of the optimized pile body is 0.59 times of the original design.If the number of steel bracing layers is not reduced,cross braces can be erected at the crown beam of the pile top and 4.68 m and 10.17 m away from the pile top.The maximum horizontal deformation of the optimized pile is 0.45 times of the original design.

关 键 词：深基坑 朗肯土压力 横撑 支护体系优化 有限差分法 

分 类 号：U414[交通运输工程—道路与铁道工程]