拉力型锚杆锚固段拉拔受力非线性全历程分析_黄明华_周智_欧进萍.pdfVIP

33 11 Vol.33 No.11 2014 11 Chinese Journal of Rock Mechanics and Engineering Nov .2014 1 2 12 (1. 150090 2. 116024) 2 TU 43 A 2014 NONLINEAR FULL-RANGE ANALYSIS OF LOAD TRANSFER IN FIXED SEGMENT OF TENSILE ANCHORS 1 2 12 HUANG Minghua ZHOU Zhi OU Jinping (1. School of Civil EngineeringHarbin Institute of Technology Harbin Heilongjiang 150090China2. School of Civil Engineering Dalian University of Technology Dalian Liaoning 116024China) Abstract A novel nonlinear shear-slipping model(named as biexponential model) as well as the load transfer solutions was firstly developed for predicting the full-range interfacial behavior of the tensile anchor. The features of the load transfer and the load-displacement curve during the full-range process of pullout were studied in detail. The measured results from the laboratory and in-situ experiments were used to verify the load transfer solutions and the above predicted features of the tensile anchor. The biexponential model was found to describe reasonably the nonlinear and softening behavior of the anchoring interface of tensile anchor. The axial forces and displacements calculated from the load transfer solutions agree well with the measured values. During the full-range pullout processthe load transfer in the fixed segment of the tensile anchor exhibits a loading and a sliding stage. During the loading stagethe shear stress distribution evolves from a monotone decaying curve with the maximum value at the pull end into a single peak curveand then further