ANALYSIS OF DYNAMIC AND FRACTURED PHENOMENA FOR EXCAVATION PROCESS OF DEEP TUNNEL
LI Shuchen1，2，QIAN Qihu2，ZHANG Dunfu1，LI Shucai1
(1. School of Civil and Hydraulic Engineering，Shandong University，Jinan，Shandong 250061；2. PLA University of Science and Technology，Nanjing，Jiangsu 210007，China)
Abstract：Tension-compression alternating regions can be formed around the rock mass during excavation process. The zonal disintegration phenomena may be brought when the geostress is too large. In order to interpret the tension-compression alternating and zonal disintegration phenomena，the dynamic mechanical model and calculation model of tunnel excavation are presented based on dynamic characteristics of tunnel excavation unloading. And the equilibrium physical equation，geometric equation and boundary condition equation are derived，which are satisfied by the disturbance stress，disturbance strain and disturbance displacement caused by the excavation unloading. Trial function of displacement is assumed considering the practical displacement constraints condition，and integral-variational equation group of the surrounding rock；and its modal matrix is induced by Hamilton time-domain variation principle considering time-domain variation and constraint conditions. The steady-state response of discrete vibration equation group is obtained using Duhamel integral in setting excavation unloading path and zero initial condition. By matrix transformation，the solutions of surrounding rocks disturbance stress，strain and displacement are obtained. The analyses of examples show that the theory and method can correctly reflect the dynamic process caused by excavation；and they effectively simulate the zonal disintegration phenomena of the rock mass.
李树忱,钱七虎，张敦福，李术才. 深埋隧道开挖过程动态及破裂形态分析[J]. 岩石力学与工程学报, 2009, 28(10): 2104-2112.
LI Shuchen1，2，QIAN Qihu2，ZHANG Dunfu1，LI Shucai1. ANALYSIS OF DYNAMIC AND FRACTURED PHENOMENA FOR EXCAVATION PROCESS OF DEEP TUNNEL . , 2009, 28(10): 2104-2112.
