| 基于厚壁筒三维解析模型的深部洞室围岩分区破裂化机制研究 |
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| 引用本文： | 鲁建荣.基于厚壁筒三维解析模型的深部洞室围岩分区破裂化机制研究[J].岩土力学,2014,35(9):2673-2684. |
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| 作者姓名： | 鲁建荣 |
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| 作者单位： | 中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室，武汉 430071 |
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| 基金项目： | 科技部国际科技合作计划项目（No. 2012DFG61510） |
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| 摘 要： | 为研究深部洞室围岩的分区破裂化机制,建立了厚壁筒三维线弹性解析模型。逐步减小厚壁筒均布内压,模拟洞室静力开挖。逐步增加厚壁筒轴向均布压力,模拟洞室开挖导致洞室轴向应力集中。逐步增加厚壁筒外周非均布压力系数,模拟洞室开挖导致洞室水平应力的重分布和集中效应。根据弹性力学知识和边界条件,确定洞室开挖引起的弹性应力场、应变场及位移场。从拉压域、应变梯度及径向压拉蓄能等3个方面入手,分别研究了内压静力卸荷、水平应力重分布、围压均匀部分及轴压对深部洞室围岩分区破裂的作用机制。结果表明:径向弹性拉伸能和径向弹性压缩能的相对变化反映了围岩能量释放速率和释放量。水平应力重分布和轴压是围岩出现分区破裂现象的主要因素,但两者作用机制不同。该模型可为研究高地应力深部洞室围岩破坏提供一个较统一的理论工具,也为深部工程设计提供了理论依据。
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| 关 键 词： | 岩石力学 厚壁筒 三维解析模型 深部岩体 分区破裂化 |
| 收稿时间： | 2013-01-03 |
Mechanism of zonal disintegration within surrounding rock of deep tunnel based on 3D analytical model of thick-walled cylinder |
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| LU Jian-rong.Mechanism of zonal disintegration within surrounding rock of deep tunnel based on 3D analytical model of thick-walled cylinder[J].Rock and Soil Mechanics,2014,35(9):2673-2684. |
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| Authors: | LU Jian-rong |
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| Institution: | State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China |
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| Abstract: | In order to investigate the zonal disintergration of surrounding rock in deep tunnel, a 3D linear elastic model is built based on linear elastic theory of thick-walled cylinder. The internal wall of model is subjected to decreasing uniform pressure to simulate the processes of cavern static excavation. The end of model is subjected to increasing uniform pressure to simulate the stress concentration effect which causes by cavern static excavation. The external wall of model is subjected to increasing pressure to simulate the stress concentration effect and stress redistribution which caused by cavern static excavation. Based on the elasticity theory and boundary conditions, the stress field, strain field and displacement field around circular opening induced by excavation are determined. We address the following features of the model: tension-compression region, strain gradient, elastic energy of compression and tension from decreasing uniform internal pressure, increasing stress redistribution and increasing uniform external pressure and axial pressure. The results show that the relative change between elastic energy of tension and elastic energy of compression would like to reflect energy release rate and quantity during the processes of cavern static excavation. The stress redistribution and axial pressure are the main factors leading to zonal disintegration. The model provides theoretical basis to study failure of surrounding rock in deep tunnel. |
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| Keywords: | rock mechanics thick-walled cylinder 3D analytical model deep rock mass zonal disintegration |
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