复合土钉墙大型现场测试及变形性状分析研究  

STUDY ON LARGE-SCALE IN-SITU TEST ON COMPOUND SOIL NAILING WALL AND DEFORMATION PROPERTY ANALYSIS

作　　者：吴忠诚[1] 汤连生[1] 刘晓纲[2] 张庆华[1] 刘允文[1] 

机构地区：[1]中山大学地球科学系 [2]重庆大学土木工程学院,重庆400045

出　　处：《岩石力学与工程学报》2007年第A01期2974-2980,共7页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(50279056);广东省自然科学基金资助项目(031601);广东省科技计划项目(2003C33301;2004B32801002)

摘　　要：通过对深圳假日广场深基坑复合土钉支护结构全过程内力和变形的观测与分析,探讨地下水和土压力变化对土–土钉耦合体力学性能的影响效应,研究爆破振动荷载下土的特性及复合土钉支护体系力学性能变化对基坑安全的作用规律,揭示复合土钉支护结构的变形特征。结果表明:(1)预应力锚索复合土钉支护结构的变形具有渐进性,每层开挖完成后,应尽快构筑支护结构以减小被支护边坡的总体水平位移,同时该支护结构还具有空间效应,靠近边坡上部布置的锚索对减小坡顶水平位移更有实际意义;(2)在桩锚式复合土钉支护结构中,土体沉降呈"勺"状分布,最大沉降值发生在最佳优势滑裂面附近,水平位移随基坑开挖不断增加,最后稳定在基坑边坡中偏下位置。Based on the in-situ test and analysis of Holiday Square deep foundation pit with the compound soil nailing support structure in Shenzhen City,the internal force and deformation of the supported structure are measured.Then the capability of soil and soil-nailing is studied;and the deformation characteristics of soil and compound soil nailing support structure are pointed out.The following analytical results can be drawn.（1） The deformation of the compound soil-nailing support structure increases gradually;and the support structure on the top of the slope is more important in prevention of the slope from horizontal deformation.（2） In compound soil nailing support structure,the maximal settlement spot lies in the slide face;and the horizontal deformation increases when the foundation pit is excavated deeper,finally,the maximal horizontal deformation spot lies in the underside of the foundation pit.

关 键 词：土力学 深基坑 复合土钉支护 内力 变形 

分 类 号：TU43[建筑科学—岩土工程]