摘要
采用有限差分法和考虑实体-结构相互作用的方法对泵站基坑开挖支护桩进行数值模拟,研究桩长、桩排距和桩径对桩身位移的影响,开挖步数对支护桩变形和受力情况的影响,得出以下结论为减小支护桩的变形,增强其稳定性,可以通过增大桩长,减小桩排距的方法改善上述问题。采用有限差分法计算的支护桩水平位移大于采用考虑实体-结构相互作用法计算的支护桩水平位移。当第一步开挖时,曲线的变化趋势较为平缓,支护桩所受的弯矩较小。大部分第四步开挖时,曲线的变化趋势显著,支护桩所受的弯矩最大。前排桩和后排桩的剪力—深度曲线具有一定的差异性,主要体现在第一步开挖的剪力-深度曲线。在工程实际中,应增大前排桩的抗剪强度,提高其抗剪性能,以维持结构的稳定性。
Finite difference method and entity-structure interaction method are used to conduct the numeric simulation of the pumping station foundation pit excavation.The influence of pile length,pile spacing and pile diameter on pile displacement are studied.The influence of excavation step number on the deformation and stress of retaining piles is analyzed.The conclusion is that the deformation of retaining piles can be reduced and the stability of retaining piles can be improved by increasing the length of piles and decreasing the distance between piles.The horizontal displacement of retaining pile calculated by finite difference method is larger than that calculated by considering the entity-structure interaction method.When the first excavation step is in progress,the curve change trend is relatively gentle,and the supporting pile by the bending moment is smaller.Most of the time,during the fourth step excavation,the change trend of the curve is obvious,and the bending moment of the retaining pile is the biggest.There are some differences between the shear-depth curves of the front piles and the back piles,which are mainly reflected in the shear-depth curves of the first excavation.In order to maintain the stability of the structure,the shear strength of the front row piles should be increased in engineering practice.
作者
张义
ZHANG Yi(Wenzhou Water Conservancy&Electric Power Survey&Design Institute CO.LTD.,Wenzhou 325000,China)
出处
《河南水利与南水北调》
2023年第1期83-84,共2页
Henan Water Resources & South-to-North Water Diversion
关键词
群桩支护
有限差分法
基坑变形
group pile support
finite difference method
foundation pit deformation
作者简介
张义(1986.3—),男,高级工程师,主要从事水利工程设计与施工
