深基坑拉锚方案变更对其稳定性的影响分析

发布时间：2018-04-02 05:37

本文选题：基坑围护　切入点：方案变更　出处：《兰州理工大学学报》2017年05期

【摘要】：针对基坑围护结构设计过于保守,运输通道处施工滞后问题,以某深基坑工程为背景,提出相应的支护变更方案.运用ABAQUS有限元软件建立三维模型,同时考虑车辆荷载乘以冲击系数转化为静载时的影响,模拟分析围护墙的拉锚支撑方案局部变更后对结构的受力变形影响,并与实测数据对比.结果表明:原方案设计过于保守,变更方案后基坑的稳定性仍满足要求,且能加快施工进度;锚索层数适当调整减少后,围护墙位移、弯矩以及锚索应力变化较小;第一层锚索的位置对围护墙墙顶位移以及围护结构受力的影响较大,离墙顶距离越大,围护结构变形越大;当车辆荷载距离基坑一定时,车辆荷载会对围护结构的受力变形产生一定影响.
[Abstract]:In view of the problem that the design of foundation pit enclosure is too conservative and the construction of transportation passage is lagging behind, the corresponding support modification scheme is put forward in the background of a deep foundation pit project. The three-dimensional model is established by using ABAQUS finite element software. At the same time, considering the influence of vehicle load multiplied by impact coefficient to static load, the influence of structural deformation caused by the local change of bracing scheme of retaining wall is simulated and analyzed. The results show that the original scheme design is too conservative, the stability of foundation pit can still meet the requirements after changing the scheme, and the construction progress can be accelerated. The position of the first layer anchor cable has great influence on the displacement of the wall top and the stress of the retaining structure. The larger the distance from the top of the wall, the greater the deformation of the surrounding structure; when the vehicle load distance from the foundation pit is constant, The vehicle load will have certain influence on the stress deformation of the enclosure structure.
【作者单位】：江西省岩土工程基础设施安全与控制重点实验室;中铁二院贵阳勘测设计研究院有限责任公司;
【基金】：江西省岩土工程基础设施安全与控制重点实验室资助项目(20161BCD40002)的资助
【分类号】：TU753

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