Controlled Blasting Technology of Liner Demolition and Ezpanding Ezcavation for Shallowly Buried Tunnel Being Changed from Single-track to Double-track Railway Line under Complez Conditions
When the Yichang-Wanzhou railway tunnels under complicated geological conditions in China were construtted from single-track to double-track railway line, in order to ensure the stability of wall rock and support structure,and safety and good effect of expanding excavation, controlled pre-splitting blasting technology was used for segmental and divisional demolition of the liner structure. At the same time, the technology of controlled weak smooth blasting was used in the expanding excavation of bench and full-face type. By a series of technical measures of controlling the quantities of explosives, establishing a number of the free faces, improving the transmission and application of non-electric millisecond detonator network, the purpose of reducing blasting vibration was reached according to the dates of real-time monitoring. Practices have proved that the results of the monitoring data were in accordance with the requirement of the process and objective control and the engineering got good results. The successful construction following the subsequence of single-track tunnel first, after double-track tunnel by demolition and expanding excavation blasting was achieved for the new tunnel under the bad conditions of crush rock, developed carst, shallow depth of burial and etc. in the Yichang and Wanzhou district of China.
Yichang-Wanzhou railway shallowly buried tunnel construction from single-track to double-track railway line demolition blasting ezpanding ezcavation blasting
HU Guowei HAO Siwang CHENG Wenbing ZHANG Junbing
The Third Engineering Group Co., Ltd.of China Railway, Taiyuan, China
国际会议
The Second Asian-Pacific Symposium on Blasting Techniques(第二届亚太地区爆破技术研讨会)
大连
英文
290-295
2009-07-01（万方平台首次上网日期，不代表论文的发表时间）