ANALYSIS OF INTERFACIAL SLIP MESOMECHANICS IN ANCHORAGE SECTION OF PRESTRESSED ANCHOR CABLE
YOU Chun¢an1,ZHAN Yubao2
(1. College of Civil Engineering and Architecture,Shandong University of Science and Technology,Qingdao,Shandong 266510,China;2. Department of Resources and Civil Engineering,Shandong University of Science and Technology,Tai¢an,Shandong 271019,China)
Abstract:Based on the test of interfacial mechanics of prestressed anchorage segment,the interfacial deformation laws and the failure conditions under different loads are studied. The test results show that anchoring strength is related to anchorage length but not with proportion relationship. When anchorage length reaches a constant value,the increase of anchoring strength is limited although with further increase of anchorage length. Under the condition,the strength of sand pulp is fixed,and the higher the sand-bearing capacity in the anchorage body is,the larger the anchoring strength is. The process from elastic deformation to plastic slip and up to debonding failure is studied on the mesoscopic level. It is demonstrated that anchorage body interfacial layer is a material with a certain thickness and special mechanical properties,whose mechanical properties are related to property of rock-soil body and closely to the material fabric of grouting body. So the mechanical properties of interfacial body will be effectively promoted based on the research on composition and mixture ratio of grouting materials,by which the anchoring strength will be improved. Deformation of one point on interface of anchorage body can be divided into three stages,i.e. elastic deformation,plastic-slipping deformation and debonding deformation. Because of the debonding effect of interface layer of anchorage body,the nearer it is to proximal end of load,the larger shear stress the anchorage body will bear. Within the whole anchorage system,the main stressed area is plastic-slipping zone;and the stresses born by elastic zone and debonding zone are relatively smaller.