Energy release process of surrounding rocks of deep tunnels with two excavation methods

• Published in: Journal of Rock Mechanics and Geotechnical Engineering Vol. 4; no. 2; pp. 160 - 167
• Main Authors: Yan, Peng, Lu, Wenbo, Chen, Ming, Shan, Zhigang, Chen, Xiangrong, Zhou, Yong
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 25.06.2012; Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of Ministry of Education, Wuhan University, Wuhan, 430072, China; Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of Ministry of Education, Wuhan University, Wuhan, 430072, China%HydroChina Huadong Engineering Corporarion, Hangzhou, 310014, China; HydroChina Huadong Engineering Corporarion, Hangzhou, 310014, China%State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, 430072, China; State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, 430072, China
• Subjects: drill-and-blast (D&B) excavation; energy release; rockbursts; TBM法; tunnel boring machine (TBM) excavation; 开挖方法; 开挖过程; 数值分析; 能量释放率; 释放过程; 锦屏二级水电站; 隧道围岩; rockbursts; energy release; tunnel boring machine (TBM) excavation; drill-and-blast (D&B) excavation
• ISSN: 1674-7755
• DOI: 10.3724/SP.J.1235.2012.00160

Numerical analysis of the total energy release of surrounding rocks excavated by drill-and-blast （D＆B） method and tunnel boring machine （TBM） method is presented in the paper. The stability of deep tunnels during excavation in terms of energy release is also discussed. The simulation results reveal that energy release during blasting excavation is a dynamic process. An intense dynamic effect is captured at large excavation footage. The magnitude of energy release during full-face excavation with D＆B method is higher than that with TBM method under the same conditions. The energy release rate （ERR） and speed （ERS） also have similar trends. Therefore, the rockbursts in tunnels excavated by D＆B method are frequently encountered and more intensive than those by TBM method. Since the space after tunnel face is occupied by the backup system of TBM, prevention and control of rockbursts are more difficult. Thus, rockbursts in tunnels excavated by TBM method with the same intensity are more harmful than those in tunnels by D＆B method. Reducing tunneling rate of TBM seems to be a good means to decrease ERR and risk of rockburst. The rockbursts observed during excavation of headrace tunnels at Jinping II hydropower station in West China confirm the analytical results obtained in this paper.