某基坑框架预应力锚杆柔性支护结构的数值模拟分析

周勇; 朱彦鹏

某基坑框架预应力锚杆柔性支护结构的数值模拟分析 English Version

周勇^1,2,
朱彦鹏^1,2

(1. 兰州理工大学甘肃省土木工程防灾减灾重点实验室，甘肃兰州 730050；2. 西部土木工程防灾减灾教育部工程研究中心，甘肃兰州 730050)

详细信息

作者简介:
周勇(1978– )，男，湖北宣恩人，博士，副教授，硕士研究生导师，国家一级注册结构工程师，主要从事深基坑开挖支护与边坡加固方面的教学和研究工作。

中图分类号: TU473
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出版历程
- 收稿日期: 2012-11-12
- 发布日期: 2012-11-12

Numerical simulation of grillage flexible supporting structure with prestressed anchors for an excavation

ZHOU Yong^1,2,
ZHU Yan-peng^1,2

(1. Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology, Lanzhou 730050, China; 2. Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou University of Technology, Lanzhou 730050, China)

摘要

摘要: 框架预应力锚杆柔性支护结构是当前基坑工程中常采用的一种支护方式，但是对其进行数值模拟分析目前未见报道。结合工程算例，运用有限元软件ADINA，选择合理本构模型，对某基坑框架预应力锚杆柔性支护结构进行了数值模拟。结果表明：基坑最终水平位移最大值出现在基坑顶部，锚杆预应力值和作用位置对坑壁水平位移影响显著；基坑地表沉降和坑底隆起均随基坑开挖深度的增加而增大；锚杆轴力随基坑开挖深度增加而增大，且沿长度方向呈曲线分布，其最大轴力作用点连线近似于基坑滑移面曲线，锚杆轴力最大值沿基坑深度方向呈“弓形”分布。数值模拟表明框架预应力锚杆柔性支护结构在深基坑支护工程中控制变形的效果显著，值得进一步推广应用。
- 岩土工程 /
- 深基坑 /
- 框架预应力锚杆 /
- 柔性支护结构 /
- 位移与内力 /
- 数值模拟
Abstract: Grillage flexible supporting structure with prestressed anchors is commonly adopted in the projects of deep excavation, but there is no report for its numerical simulation analysis till today. Based on an engineering example, by using the FEM software ADINA and choosing reasonable constitutive models, the numerical simulation for grillage flexible supporting structure with prestressed anchors for an excavation is performed. The results show that the final maximum horizontal displacement appears at the top of excavation, and the prestress values as well as the action positions of the prestressed anchors have significant influences on the horizontal displacement of wall facing. With the increase of excavation depth, the ground surface settlement and the bottom uplift of excavation increase at the same time. The axial forces of anchors increase with the increase of excavation depth, which are on curve distribution along the length direction. The connection line of the points of the maximum axial forces is similar to the slipping surface curve of excavation, and the maximum values of the axial forces of anchors appear bow-shaped distribution along the direction of excavation depth. The numerical simulation shows that the grillage flexible supporting structure with prestressed anchors has obvious effect on the deformation control for deep excavation, and it is worthy of further promotion and application.
- geotechnical engineering /
- deep excavation /
- grillage with prestressed anchors /
- flexible supporting structure /
- displacement and internal force /
- numerical simulation

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参考文献(13)

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