Analysis of In-Situ Geo-Stress and Rockburst at No.2 Ventilation Shaft Tunnel of oft-com:office:smarttags" />
详细信息
- 责任者：Xu Shiliang (Department of Geotechnical Engineering ; Anhui Institute of Architecture and Industry ; Hefei 230022 ; China) ; Cui Zhendong
- 刊名：Journal of Engineering Geology
- 出版年：2010
- 卷期：18(3)
- 关键词：隧道 ; tunnels ; 竖井 ; shaft ; 地应力 ; geostress ; 岩爆 ; rock bursts ; 秦岭 ; Qinling Mountains
- 页码：p.407-412
- 图表：illus., 4 tables, 15 refs.
- 分类号：1702
- issnNo：ISSN1004-9665
- isbnNo：CN11-3249/P
摘要
The paper examined the engineering geology of the shaft and the geo-stress measurement results of nearby engineering by hydraulic fracturing method. Then, the geo-stress field in the shaft area is calculated and regressed with 3D finite element method. It is shown that the geo-stress in the shaft area has a high horizontal geological structure stress and is distributed in zones. The maximum horizontal geo-stress is 28.7 MPa. The vertical geo-stress is controlled by weight of rockmass. Based on the geo-stress field, the rockburst prediction in the shaft is made according to the Tao’s rockburst criteria. The depth of rockburst failure area is estimated with the constant-deviatoric-stress-criterion of brittle rock mass. The results show that there are high possibilities of occurring weak and moderate rockbursts. The maximum depth of failure is 0.6 m in the surrounding rocks of the shaft. The results from the geo-stress and rockburst analysis are well compared with the actual situations of rockbursts after shaft excavation.