微型钢管桩复合土钉支护工作性能现场测试研究  

Field Test and Analysis of Performance of Composite Soil Nail Retaining with Miniature Steel Tube Stake

作　　者：葛燕锋[1] 王志伟 

机构地区：[1]北方工业大学建筑工程学院,北京100041 [2]鑫诚建设监理咨询有限公司,北京100814

出　　处：《建筑科学》2008年第1期57-60,共4页Building Science

基　　金：北京市教育委员会科技发展计划面上项目资助(2002KJ030)

摘　　要：通过对基坑复合土钉支护的坑壁水平位移和土钉应力现场测试,数据分析表明:土体最大水平位移发生于基坑顶部;基坑深度范围内中部土钉受力最大;土钉布置宜上长下短,下部土钉适当加密,以抵抗基坑底部存在的剪应力集中;重要区段基坑采用复合土钉支护,可提高基坑支护整体刚度,减小基坑变形,提高基坑安全度。The field test of the horizontal displacement of foundation pit wall with soil nailing and the soil nailing stress has been carried out. The results indicate that the maximum horizontal displacement occurs on the top of foundation pit and the maximum soil nailing stress within the range of whole depth occurs in the middle. The length of soil. nails should be long at the upper row and short at the lower row, where the soil nails should be dense, so as to resist the concentrated shear stress at the bottom of foundation pit. The composite soil nailing is utilized in the important section of foundation excavation to improve do the integral stiffness of foundation pit, to decrease the deformation and to upgrade the safety.

关 键 词：复合土钉支护 现场测试 水平位移 土钉应力 

分 类 号：TU472[建筑科学—结构工程] TU472.34[建筑科学—土工工程]