外有堆载的深基坑桩锚支护结构性状

Characters of pile-anchor retaining structures in deep foundation pit under heaped load

为研究坑边堆载对桩锚支护结构的内力和位移的影响,采用有限元数值模拟方法,运用Adina软件对实际基坑工程的开挖支护过程进行模拟,得到了支护结构分别在不同堆载大小、堆载宽度和堆载距坑边距离作用下的位移值和弯矩值的变化曲线.研究结果表明:堆载对支护结构的内力位移影响较大,不同堆载作用形式对支护结构的影响规律不同,减小堆载大小、增大堆载宽度和距坑边距离可有效减小支护结构的位移,使桩身弯矩分布更合理.

In order to investigate the impact of foundation pit edge under heaped load on the internal force and displacement of pile-anchor retaining structures, this paper simulated the excavation and support process, based on practical foundation pit, by using finite element numerical simulation method and software Adina. The curves of displacement and bending moment, in the different loading levels or the width of loading or the distance between loading face edge and foundation pit edge, are attained. The results of study indicate that the heaped load on the pit edge has a great impact on the internal force and deformation of the retaining structures. Furthermore, the impact on retaining structures is different in the different form of heaped load. The results show that bending moment distribution in the pile should be reasonable, in that the displacement of retaining structures are reduced by less heaped load or wider space of the heaped load or wider distance of foundation pit edge.