复合土钉支护中土钉内力实验  

Testing of soil nailing tension in compound soil nailing

作　　者：赵延林[1] 景海河[1] 曹洋[1] 

机构地区：[1]黑龙江科技学院建筑工程学院,哈尔滨150027

出　　处：《黑龙江科技学院学报》2009年第5期380-383,共4页Journal of Heilongjiang Institute of Science and Technology

基　　金：黑龙江省教育厅科学技术研究项目(11521255);哈尔滨市科技创新人才研究专项资金项目(2008RFQXS109)

摘　　要：为了解土钉-预应力锚杆-微型桩复合土钉支护体系中土钉的受力情况,对北京市某复合土钉支护的深基坑工程中的土钉轴力进行现场原位实验,分析土钉轴力变化规律。结果表明:土钉受力具有时间效应与瞬时开挖效应,锚杆的张拉锁定可有效减缓上层土钉轴力的增长速度;土钉轴力的分布表现为两头小、中间大的特点,其峰值沿深度呈上下小、中间大的分布形式,最大峰值点位于基坑边坡中部;在坡脚附近,土钉最大轴力峰值点未出现在坡脚,而与坡脚有一定距离;喷射混凝土面层承受的侧向土压力较小,并随深度呈上下小、中间大的分布规律。In order to cropile supporting system, situ tension test of soil investigate the stress of soil nailing in soil nailing-prestressed soil anchor-mithis paper analyzes the changing rules of tension of soil nailing through the in nailing of a deep foundation pit supported with compound soil nailing in Beijing Analytical results show that soil nailing under stress gives time effect and instant excavation effect. The stretching and locking of soil anchor allows the increment speed of tension of upper soil nailing to be effectively released, Soil nailing exhibits the tension distribution, characterized by small size in double-end and large one in the middle and the tension peak of soil nailing tends to be large in middle and small in top and bottom, as determined by depth direction, with the maximum peak is occurring in the middle of foundation pit slope. In the zone near the base of slope, the maximum peak of tension of soil nailing dose not occur in the base of slope, but a given distance away. The shotcrete surface is subjected to smaller lateral soil pressure, with distributioin tending to be large in the middle and small in top and bottom depending on depth direction.

关 键 词：复合土钉 预应力锚杆 微型桩 土钉 原位实验 

分 类 号：TU473.2[建筑科学—结构工程]