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| Optimization and Study of Allocation of Drill and Blast Excavation Equipment for High - speed Railway Tunnels |
| ZHOU Rong |
| (Qianjiang - Zhangjiajie - Changde ( Huailiua - Shaoyang - Hengyang) Railway Company，Changsha，Hunan 410008， China) |
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Abstract Abstract : Research purposes : In recent years，more and more high - speed railway tunnels have been built in China. However，these high - speed railway tunnels are basically constructed by drill and blast method assisted by hand - held pneumatic drills and multi - purpose operation platforms. Such equipment allocation mode has the following disadvantages : high laborer working strength，poor working environment， requiring many laborers and high energy consumption. As the tunneling mechanization level develops，China Railway Corporation requires that long tunnels with Grade II and Grade III surrounding rocks taking a large proportion of the total must be constructed by mechanized means represented by heavy - duty equipment such as rock - drilling jumbos，so as to ensure the quality and safety of the high -speed railwaRtunnels. Research conclusions :( 1) For tunnels with 200 km/h train running speed or high - speed railway tunnels，the drill and blast excavation by one single rock - drilling jumbo can achieve the excavation speed matching the invert and lining construction speed (180 ?200m/month )，and it can meet the requirements of ChinaRailway Corporation on the distance between excavation and lining, therefore it is the best and most rational tunneling equipment allocation scheme. As the demographic dividend in China decreases and more and more rock - drilling jumbos are manufactured in China, the cost of drill and blast by hand - held pneumatic drills is increasing, while that by rock - drilling jumbos is reducing. In the near future, the cost of tunnel excavation by one single rock - drilling jumbo will be lower tlian that by hand - held pneumatic drills. (3) Due to the shortcomings of the rock - drilling jumbos, at present rock - drilling jumbos may cause overbreaks. However, after some modifications to the rock - drilling jumbos, they can meet the overbreak requirements of tunnel construction in China, which creates good conditions for the wide application of the rock - drilling jumbos. (4) Due to the application of the rock - drilling jumbos, the management of the project turns from managing the laborers to managing the equipment operation, which can minimize the errors, improve the works quality, reduce the number of the laborers worl^ing at the tunnel face, improve the site working environment and minimize the accident probability. The application of rock - drilling jumbos in tunneling is suitable for the tunneling market and the technological progress of the tunneling industry, and its social and economic significance will be improved step by step. (5 ) The research results can be applied to allocation of drill and blast excavation equipment for high - speed railway tunnels.
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Received: 20 October 2016
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2016, Vol. 33 
