单孔复合型锚杆锚固体应力分布特征研究

结合某工程深基坑边墙单孔复合型锚杆施工,选取4根锚杆作为试验锚杆,通过在锚固体范围埋设多个应变测试元件,对锚固体在不同张拉载荷条件下的应力分布状态进行了现场测试研究.根据单孔复合型锚杆的结构特点,对代表性锚固体建立有限元数值模型,并对锚固体的应力-应变特征进行了数值分析.根据现场测试和数值分析结果,对单孔复合型锚杆锚固体的应力分布规律和锚固机理进行了研究.

RESEARCH ON STRESS DISTRIBUTION ALONG BOLTS WITH SINGLE BOREHOLE AND MULTIPLE ANCHORS

In the light of installation construction of bolts with new type of single borehole and multiple anchors to support a deep excavation foundation pit wall,four bolts are selected for experimental bolts to study the stress distribution characteristic along bolts by measuring strain of bolts during process of applying tension loads to the bolts. For each bolt,there are several anchors,and for each anchor section,several strain cells are installed. The variation of strain along bolts is measured in field by strain cells during the process of different steps of tension loads. In addition,numerical modeling technique is used to simulate the stress-strain status of typical anchor sections according to the structure of this new type of bolts. At last,the mechanical properties in term of stress-strain distribution characteristic along the bolts with single borehole and multiple anchors are analyzed based on measuring of strain in situ and numerical modeling of stress-strain by FEM.