RESEARCH ON STRESS DISTRIBUTION ALONG BOLTS WITH SINGLE BOREHOLE AND MULTIPLE ANCHORS
单孔复合型锚杆锚固体应力分布特征研究

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.