CALCULATION OF THE SHOTCRETE UTILIZATION FOR LINING WITH INTEGRATED YIELDING ELEMENTS Paper No.262
作者单位：Institute for Rock Mechanics and Tunnelling Graz University of Technology
会议名称：《ISRM-Sponsored International Symposium on Rock Mechanics:"Rock Characterisation,Modelling and Engineering Design Methods"(SINOROCK2009)》
会议日期：2009年
学科分类：081406[工学-桥梁与隧道工程] 08[工学] 0814[工学-土木工程] 082301[工学-道路与铁道工程] 0823[工学-交通运输工程]
关 键 词：Shotcrete yielding elements tunneling in weak ground squeezing conditions utilization ratio
摘 要：When dealing with tunnels in weak rock mass and with high overburden,the high displacements imposed on the lining dictate the application of ductile yielding elements with controllable stiffness and yield *** properties are chosen with two goals in mind:the time-dependent strength of the shotcrete shell must not be exceeded;however the support pressure must be kept reasonably high and *** attainable load-displacement lines of the ductile support elements are almost *** are almost countless possible combinations of their stiffness and yield load,thus enabling the development of custom-tailored support systems and leaving considerable room for adapting to the encountered ground conditions. Tunneling in weak ground should be accompanied by increased efforts on monitoring the system behavior,best by a dense pattern of absolute displacement measurements.A simple technique for calculating the shotcrete utilization ratio has been *** applies a Newton-Raphson root-finding algorithm to determine the interpolation parameters while obeying the requirements of force equilibrium and fitting the measured *** influence of nonsymmetrical displacement behavior caused by heterogeneity and anisotropy of the rock mass,on the lining loading can be quantified and used for support system optimization.