RESEARCH ON BLASTING STABILITY CONTROL TECHNOLOGY OF LARGE-SPAN HIGHWAY TUNNEL WITH SUPER-SMALL CLEAR SPACING AT HIGHWAY EXPANSION PROJECT
LIN Congmou1，CHEN Libiao2，JIANG Lili3，ZHENG Hongli4
(1. Research Institute of Geotechnical Engineering，Huaqiao University，Quanzhou，Fujian 362021，China； 2. Expressway Construction Headquarters of Fujian Provincial，Fuzhou，Fujian 350001，China； 3. Coal Industry Jinnan Design and Research Co.，Ltd.，Jinan，Shandong 250031，China； 4. China Railway 16 Bureau Group 4th Branch，Beijing 101400，China)
Abstract：Based on the uncommon tunnel—Damaoshan tunnel，the stability control technology of tunnel is studied when blasting construction on new-built tunnel，combining with the current study results and codes. According to the modern information construction theory，and the field monitoring technique is used to obtain the blasting vibration velocity and regression analysis result，the critical value of particle vibration velocity of existing tunnel is defined as 20 cm/s，then the blasting parameters are optimized. The final monitoring result indicates that the operation of the railway is not influenced by the construction of tunnels obviously. At the same time，the numerical simulation is employed to get the law of vibration velocity in disturbanced rock and exiting tunnel wall rock variation with time. The largest blasting velocity of rock can be proved to be accordance with the criterion，which validates that this kind of control technique about blasting stabilization is reasonable. Through data analysis，some results are obtained：vibration velocity at tunnel shoulder is that at the bottom 1.19–3.99 times，vibration velocity at tunnel waist is that at bottom 1.10–3.11 times，vibration at head-burst side is that at back side 5–10 times. The research result offers the theoretical and methodological experiences to the similar engineering.
林从谋，陈礼彪，蒋丽丽，郑宏利. 高速公路扩建大断面特小净距隧道爆破稳定控制技术研究[J]. 岩石力学与工程学报, 2010, 29(07): 1371-1378.
LIN Congmou1，CHEN Libiao2，JIANG Lili3，ZHENG Hongli4. RESEARCH ON BLASTING STABILITY CONTROL TECHNOLOGY OF LARGE-SPAN HIGHWAY TUNNEL WITH SUPER-SMALL CLEAR SPACING AT HIGHWAY EXPANSION PROJECT. , 2010, 29(07): 1371-1378.
