复合土钉支护结构水平位移分析研究  

Analysis on Horizontal Displacement of Composite Soil Nailing Supporting Structure

作　　者：金清平[1,2] 李小青[1] 胡斌[1] 

机构地区：[1]华中科技大学土木工程与力学学院,武汉430070 [2]武汉科技大学城建学院,武汉430065

出　　处：《武汉理工大学学报》2010年第1期131-134,142,共5页Journal of Wuhan University of Technology

基　　金："十一五"国家科技支撑计划(编号:2008BAJ06B03)

摘　　要：复合土钉支护技术在我国基坑工程中得到了广泛应用,结构的水平位移对工程有着至关重要的作用。目前对水平位移还没有完善和统一的设计与计算标准,施工控制也没有明确的规定。结合某复合土钉支护基坑工程,通过合理布点测得开挖中桩体水平位移。通过位移变化曲线分析,发现水平位移变形具有渐进性;对上部几层开挖比较敏感,特别是前两层开挖对桩身的水平位移影响较大;靠近上部布置的锚索更有利于减小基坑边坡的变形;支护结构水平位移与墙体长度有着明显的关系等规律。通过实际比较后认为规范对水平位移规定值可以适当放宽。土钉或预应力锚索的使用也影响着水平位移。Composite soil nailing supporting technology is applied widely in our country,the horizontal displacement of the structure is very important.At present,the perfect standard of the design and the calculation and the construction control cannot be determined for the horizontal displacement.According to the composite soil nailing supporting foundation pit,the pile body horizontal displacement is measured by reasonable measuring point.Some conclusions are drawn by displacement curves： the horizontal displacement is progressive and sensitive to upper several layers digging,and is affected greatly by upper two layers;the anchor cables arranged in near upper layers are advantageous to reducing deformation of foundation pit slope;the horizontal displacement of supporting structure is affected obviously by structure dimension.It is thought that the defined value about the horizontal displacement in the code may be properly relaxed by practical comparison.The horizontal displacement is also affected by soil nailing or pre-stressed anchor cable.

关 键 词：基坑 复合土钉 预应力锚索 支护结构 水平位移 

分 类 号：TU433[建筑科学—岩土工程]