TIME-DEPENDENT DEFORMATION ANALYSIS OF SURROUNDING ROCK OF LARGE-SCALE CAVERNS SUBJECT TO COMPLEX GEOSTRESS CONDITION AND ITS MECHANICAL SIMULATION
LIU Huibo1，2，XIAO Ming1，2，ZHAO Chen1，2，CHEN Juntao1，2
(1. State Key Laboratory of Water Resources and Hydropower Engineering Science，Wuhan University，Wuhan，Hubei 430072，China；2. Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering，Ministry of Education，Wuhan University，
Wuhan，Hubei 430072，China)
Abstract：The time-dependent deformation mechanism of surrounding rock of large-scale underground caverns subjected to blast excavation and complex geostress condition is analyzed and a mechanical simulation method is proposed. Based on the analysis of monitored displacements and rockmass mechanics theory，it is identified that the high geostress mechanism and spatial effect of excavation damaged zone are two main affecting factors for the time-dependent behavior of surrounding rock of underground cavern in complex high geostress environment. With excavation process simulated by the stress release finite element method，time-dependent identification functions of excavation release loads and excavation damaged zones are established. Thus，a partition method for sequential excavation loads release based on the monitored curve of displacement vs. time and a deterioration model for deformation modulus on the basis of partial concept of excavation damaged zones are presented. Illustrated with engineering application to deformation analysis of large-scale underground powerhouse of Xiluodu hydropower plant，it is shown that，by coupling calculation of the excavation release load and spatial damaged zone，the simulation method is rational and effective for time-dependent behavior analysis of surrounding rock of large- scale caverns on the whole excavation process，which is of applicability and practical reference for the interpretation and control of deformation and damage effect of surrounding rock under complex geostress condition subjected to blast excavation，for optimizing the construction and supporting，and effective monitoring feedback analysis.
刘会波1，2，肖 明1，2，赵 辰1，2，陈俊涛1，2. 复杂地应力环境大型地下洞室围岩时效变形机制及力学模拟[J]. 岩石力学与工程学报, 2013, 32(s2): 3565-3574.
LIU Huibo1，2，XIAO Ming1，2，ZHAO Chen1，2，CHEN Juntao1，2. TIME-DEPENDENT DEFORMATION ANALYSIS OF SURROUNDING ROCK OF LARGE-SCALE CAVERNS SUBJECT TO COMPLEX GEOSTRESS CONDITION AND ITS MECHANICAL SIMULATION. , 2013, 32(s2): 3565-3574.
黄润秋，黄 达，段绍辉，等. 锦屏I级水电站地下厂房施工期围岩变形开裂特征及地质力学机制研究[J]. 岩石力学与工程学报，2011，30(1)：23-35.(HUANG Runqiu，HUANG Da，DUAN Shaohui，et al. Geomechanics mechanism and characteristics of surrounding rock mass deformation failure in construction phase for underground powerhouse of Jinping I hydropower station[J]. Chinese Journal of Rock mechanics and Engineering，2011，30(1)：23-35.(in Chinese))
[2]
魏进兵，邓建辉，王俤剀，等. 锦屏一级水电站地下厂房围岩变形与破坏特征分析[J]. 岩石力学与工程学报，2010，29(6)：1 198-1 205. (WEI Jinbing，DENG Jianhui，WANG Dikai，et al. Characterization of deformation and fracture for rock mass in underground powerhouse of Jinping I hydropower station[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(6)：1 198-1 205.(in Chinese))
<body>Your browse does not support frame!</body>
2013, Vol. 32 
