关键词: 深部巷道, 围岩破坏, 数值分析, 弹塑性分析, 岩石力学

Abstract: Based on the field engineering geological survey and rock mechanics experiment of deep roadway surrounding rock in Tengjia mining area of Xincheng Gold Mine， the rock mass quality of roadway surrounding rock is classified as Grade III， poor or general level， by RMR， Q and GSI methods respectively. Based on rock mass quality classification， Hoek-brown criterion and empirical formula are used to estimate rock mass mechanical parameters. Elastic-plastic mechanics is adopted to analyze the failure range of plastic zone of roadway surrounding rock， and Phase 2 is used to analyze the stability of surrounding rock of roadway. The results show that the plastic failure range of roadway roof is 0.598 m， the plastic failure range of two sides is 0.84 m and 0.695 m respectively. The displacement of roadway roof is 7.2 mm， and the displacement of two sides is 7.6 mm and 6.8 mm， respectively. From the stress analysis of roadway surrounding rock， it can be seen that the stress concentration produced by deep roadway excavation exceeds the strength of rock mass. So， it can be judged that the damage of deep roadway surrounding rock is mainly caused by stress of excavation disturbance on jointed rock mass， resulting in the failure and destroy of roadway surrounding rock. This study provides a basis for supporting surrounding rock of deep roadway.

Key words: Deep drift, Surrounding rock failure, Numerical analysis, Elastic-plastic analysis, Rock mechanics