岩土力学Issue(9)：2673-2684,12.
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
Mechanism of zonal disintegration within surrounding rock of deep tunnel based on 3D analytical model of thick-walled cylinder
摘要
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.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Key words
rock mechanics/thick-walled cylinder/3D analytical model/deep rock mass/zonal disintegration分类
交通工程引用本文复制引用
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,(9):2673-2684,12.基金项目
科技部国际科技合作计划项目 （）
