Rockburst Prediction of Penyinla Tunnel in Brahmaputra Valley Section
详细信息
- 责任者：Wang Xihua (School of Resources and Environment ; Southwest Petroleum University ; Chengdu 610500 ; China) ; Zhao Zhiming
- 刊名：Journal of Earth Sciences and Environment
- 出版年：2013
- 卷期：35(2)
- 关键词：隧道 ; tunnels ; 岩爆 ; rock bursts ; 雅鲁藏布江 ; Yarlung Zangbo River
- 页码：p.115-119
- 图表：illus., 3 tables, 17 refs.
- 分类号：1702
- issnNo：ISSN1672-6561
- isbnNo：CN61-1423/P
摘要
Penyinla tunnel is located in Brahmaputra valley section with high ground stress.In order to ensure construction safety,ground stress was measured in Penyinla tunnel by hydro-fracturing method;distribution characteristics of stress field of the surrounding rock were analyzed by linear regression method;the critical depth of tunnel rockburst was calculated by Russenes criterion and HOU Fa-liang critical depth criterion,and the rockburst tendency in different depths of section was predicted.The results showed that the maximum horizontal principal stress was 24.7-27.4MPa,the direction was about NE 35°,the ground stress was extremely high,and the average of lateral pressure coefficient was 1.7;the possibility of rockburst was low when the depth of tunnel was less than 200m,but weak rockburst happened partly,weak-medium rockburst happened possibly when the depth was 200-400m,and strong rockburst happened possibly when the depth was more than 400m;the theoretical critical depth of rockburst was 325m,but the actual minimum depth of rockburst was 300m.Therefore,reasonable excavation and necessary engineering measures should be adopted for the tunnel construction to avoid rockburst disaster.