狭长土岩组合基坑支护结构变形与受力变化规律的现场测试  

Field Test of Deformation Behavior and Stress Mechanism for Long-narrow Type and Soil-rock Composition Excavation

作　　者：杨金华[1,2] 夏元友[1] 刘毅[3] 裴尧尧[1] 

机构地区：[1]武汉理工大学土木工程与建筑学院,武汉430070 [2]云南交通职业技术学院建筑工程学院,昆明650101 [3]江苏省交通规划设计院股份有限公司,南京210005

出　　处：《武汉理工大学学报》2012年第12期78-82,共5页Journal of Wuhan University of Technology

摘　　要：以武汉某地铁车站土岩组合的狭长形超大深基坑为依托,结合现场工程测试,对支护结构支撑轴力和桩身位移进行了分析,总结了该类基坑支护结构变形与受力变化规律:由于基坑狭长型的特点,相对于基坑端头井部分,基坑标准段受荷载影响大,由于其地层为土岩组合地层,基坑的变形和轴力在上部土层部分均较大。并在此基础上对该类基坑支护结构的设计和施工提供了有用的建议。A super deep excavation of a subway station in Wuhan is long-narrow type and soil-rock composition.The deformation behavior and stress mechanism of the support structure is systematic analyzed by testing the supports axial force and the deformation of the retaining piles.Results show that the surcharge has a considerate influence on the deformation of the standard section of the excavation pit.The pile deformation profile presents bottle shape when the medial struts are installed timely;otherwise the profile shows triangular shape.Due to the special geologic condition,larger deformation and axial force appear at the top of the soil layers.The useful suggestions of design and construction of this kind deep excavation are proposed for the latter counterpart constructions.

关 键 词：土岩组合基坑 狭长型 轴力特点 变形规律 

分 类 号：TU463[建筑科学—结构工程]