Research and Practice of Rapid Excavation Technology for the Large Section and Compound Roof Coal Roadway
Authors
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College of Resources & Safety Engineering, China University of Mining & Technology (Beijing), Beijing ,CN
Mingzhou Zhao -
School of Mechanics & Civil Engineering, China University of Mining & Technology (Beijing), Beijing 100083 ,CNRenshu Yang
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School of Mechanics & Civil Engineering, China University of Mining & Technology (Beijing), Beijing 100083 ,CNDongming Guo
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School of Civil Engineering, Guizhou University of Engineering Science, Bijie 551700 ,CNJuan Fang
Keywords:
Large Section, Compound Roof, Cycle Step, Bolting Machine, Rapid Excavation.Abstract
Targeting at slow tunnelling advance rate problem of the coal roadway with large section and compound roof in Zhaozhuang mine, on the basis of site investigation and statistical analysis, revealed that the engineering geological conditions, support parameters and construction technology are the main factors affecting tunnelling efficiency, and then through the numerical simulation to optimize the roadway support parameters, the theoretical calculation of a reasonable cycle step, the EJM270/4-2 header with bolting machine with higher tunnelling efficiency and tunnelling and bolt integration was selected, the improved excavation construction programme compared to the original construction programme, increased the cycle pace, shortening the cutting of coal, support and other major processes of working time. Field practice results show: not only ensured the safety of tunnelling construction and the stability of surrounding rock, but also increased the monthly footage from 210 m/month to 262 m/month, tunnelling speed increased by 24.7%, at the same time, the roadway molding was better, the labour intensity of workers was reduced, and good benefits have been achieved.
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