深基坑桩锚支护中横梁及粘滞效应的影响分析  

Influence Analysis of Beam and Viscosity Effect in Pile-Anchor Supporting of Deep Foundation Pit

作　　者：沙成满[1] 杨慧敏 王星 Sha Chengman;Yang Huimin;Wang Xing(School of Resources&Civil Engineering,Northeastern University,Shenyang 110819,P.R.China)

机构地区：[1]东北大学资源与土木工程学院,沈阳110819

出　　处：《地下空间与工程学报》2023年第4期1270-1280,共11页Chinese Journal of Underground Space and Engineering

基　　金：“十三五”国家重点研发计划项目(2016YFC0801603,2017YFC1503105)。

摘　　要：在深基坑排桩支护设计中常将土的粘滞效应忽略,但对粘土分布较为广泛地区这并不符合工程实际,对于锚索施工后出现的意外脱锚现象也并未有具体研究。基于Kelvin粘弹性地基模型,对具体的深基坑排桩支护过程进行有限元模拟,分析了考虑粘滞效应的情况下支护结构中脱锚效应对支护桩的变形时效影响,以及考虑横梁和不考虑时横梁锚索失效的影响范围。结果表明,粘滞效应能够在支护桩变形、内力变化、锚索力变化过程中起到一定的延缓作用;考虑横梁也可有效抑制结构在水平方向的变形发展,且可有效提高支护桩体的抗弯性能,当发生脱锚后对结构变形等具有明显保护作用。The viscous effect of soil is often neglected in deep foundation pile support design,which is not consistent with the engineering reality in the area where the clay soil is widely distributed.There is no specific study on the accidental deanchoring phenomenon after the anchor cable construction.Based on the Kelvin viscoelastic foundation model,finite element simulation of the particular deep foundation pile support process was carried out to analyze the influences of deanchoring effect on the deformation time effect of the support pile in the support structure under the consideration of viscous hysteresis effect,and the influence range of anchor cable failure with and without considering the crossbeam.The results show that the dense hysteresis effect can play a specific role in delaying the deformation,internal force change,and anchor cable force change of the supporting pile;considering the crossbeam can also effectively inhibit the development of the deformation of the structure in the horizontal direction,and can effectively improve the bending resistance of the supporting pile body,and has a significant protective effect on the structural deformation when the deanchoring occurs.

关 键 词：桩锚支护 深基坑 粘滞效应 脱锚效应 横梁 

分 类 号：TU473.1[建筑科学—结构工程]