CAJ | 학술논문

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。
위연구심부동실위암적분구파열화궤제，건립료후벽통삼유선탄성해석모형。축보감소후벽통균포내압，모의동실정력개알。축보증가후벽통축향균포압력，모의동실개알도치동실축향응력집중。축보증가후벽통외주비균포압력계수，모의동실개알도치동실수평응력적중분포화집중효응。근거탄성역학지식화변계조건，학정동실개알인기적탄성응력장、응변장급위이장。종랍압역、응변제도급경향압랍축능등3개방면입수，분별연구료내압정력사하、수평응력중분포、위압균균부분급축압대심부동실위암분구파렬적작용궤제。결과표명：경향탄성랍신능화경향탄성압축능적상대변화반영료위암능량석방속솔화석방량。수평응력중분포화축압시위암출현분구파렬현상적주요인소，단량자작용궤제불동。해모형가위연구고지응력심부동실위암파배제공일개교통일적이론공구，야위심부공정설계제공료이론의거。
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.