预应力作用下深基坑桩锚支护结构整体稳定性分析研究  

ANALYSIS OF GLOBAL STABILITY OF PRESTRESSED PILE-ANCHOR SUPPORTING STRUCTURES IN DEEP EXCAVATION

作　　者：李元勋[1] 朱彦鹏[1] 王邓峮 

机构地区：[1]兰州理工大学西部土木工程防灾减灾教育部工程研究中心,兰州730050 [2]合肥工业大学建筑设计研究院,合肥230009

出　　处：《工程力学》2017年第11期167-174,239,共9页Engineering Mechanics

基　　金：教育部创新团队发展计划项目(IRT13068)

摘　　要：深基坑桩锚支护结构中诸多研究是基于预应力锚杆或基坑稳定性的,对锚杆预应力与基坑稳定性之间的相互影响、相互作用的系统研究并不多见。以此出发,分析桩锚支护结构受力性能,引入附加应力法,将施加于锚杆上的预应力等效为土体中的附加应力,建立考虑预应力作用的深基坑桩锚支护结构整体稳定性计算模型,推导计算公式。并应用于工程实例,与不同方法相对比,结果表明:该文方法能较好地反映出预应力的变化对基坑整体稳定性安全系数的影响,可实时掌握不同施工阶段中基坑安全性的动态变化情况,同时也说明该方法是合理的、可行的。Most studies on pile-anchor supporting structures of deep excavation focus on the prestressed anchors and the stability of excavation. However, investigation on the mutual influence and the interaction between the prestress in anchors and the stability of excavation is relatively rare. The object of this paper is to analyze the mechanical performance of pile-anchor supporting structures by using additional stress method and transforming the prestress of anchors to additional stress from soil. A numerical model with prestressing effect of global stability is established for deep excavation pile-anchor supporting structure in this paper and calculation formulas are derived. The results show that the proposed method demonstrates that the variation of prestress has an effect on the global stability safety coefficient of excavation. Furthermore, changes of safety conditions of excavation in each construction stage is also under control, indicating that this method is reasonable and feasible.

关 键 词：深基坑 桩锚支护结构 预应力锚杆 附加应力法 整体稳定性 

分 类 号：TU473.2[建筑科学—结构工程]