框架预应力锚杆柔性支护结构坡面水平位移影响因素  

Influencing factors of horizontal displacement of wall facing of grillage flexible supporting structure with prestressed anchors

作　　者：周勇[1,2] 朱彦鹏[1,2] 

机构地区：[1]兰州理工大学土木工程学院,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

出　　处：《岩土工程学报》2011年第3期470-476,共7页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(50978129);兰州理工大学博士科研基金项目(BS04200902)

摘　　要：框架预应力锚杆柔性支护结构由于其诸多优点在基坑开挖支护工程中得到了广泛应用,但是目前的设计多注重于强度设计,而对支护结构水平位移问题很少讨论。随着基坑开挖深度和规模的增大,其位移和稳定问题日益成为工程界关注的焦点。考虑基坑开挖过程的影响,基于某工程实例分析讨论了框架预应力锚杆柔性支护结构的坡面水平位移的影响因素,包括开挖深度、基坑坡角、地面施工荷载、土体物理力学性质、超开挖深度、锚杆设计参数和框架立柱抗弯刚度。经过分析对部分参数的影响得出了定性的结论,而对其余参数的影响给出了定量的结果,这些结论不仅可以为进一步认识框架预应力锚杆柔性支护结构的作用机理提供依据,同时可供工程技术人员设计时参考。Grillage flexible supporting structure with prestressed anchors has been widely used in foundation excavation engineering because of its many advantages.The present design mainly focuses on the strength design,and there is little study about the horizontal displacement of supporting structure.But with the increase of excavation depth and scale,the displacement and stability problem is becoming a focus in engineering world.Considering the influence of excavation process,based on an engineering example,the influencing factors of the horizontal displacement of wall facing of grillage flexible supporting structure with prestressed anchors are analyzed.These factors include excavation depth,slope angle,construction load above ground,physico-mechanical properties of soil,supper-excavation depth,design parameters of anchors as well as the bending stiffness of grillage vertical columns.Through analysis,some qualitative conclusions are drawn for the influences of partial factors,and some quantitative results are given for the influences of the rest factors.In general,the above conclusions provide some reasons for further understanding the work mechanism of grillage flexible supporting structure with prestressed anchors and are useful references for engineers.

关 键 词：深基坑工程 框架预应力锚杆柔性支护结构 坡面水平位移 影响因素 开挖过程 

分 类 号：TU470.1[建筑科学—结构工程]