Study on Support Technology of Deep Mine Roadway in Xingdong Coal Mine
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TECHNICAL NOTE
Study on Support Technology of Deep Mine Roadway in Xingdong Coal Mine Jianjun Shi . Jicheng Feng . Rui Peng
Received: 14 July 2020 / Accepted: 24 August 2020 Ó Springer Nature Switzerland AG 2020
Abstract Because of the large depth of the mine, the original use of bolt, mesh and spray composite support, the roadway shrinkage deformation is more serious, which not only affects the use but also endangers the safety of production. According to the deformation of surrounding rock and the characteristics of engineering technology, the following three different supporting technologies are adopted: the combined reinforcement technology of bolting and shotcreting grouting, the support technology of anchor cable on the floor, and the support technology of fully enclosed U-shaped steel ring support. The research results are applied to the field engineering practice. The monitoring results show that the fully closed U-shaped steel ring support technology has the best supporting effect, the roadway deformation meets the production requirements, the roadway renovation time is longer, and it can meet the requirements of the surrounding rock of the roadway with a depth of one kilometer. Keywords Deep roadway Support scheme Anchor cable of the floor Closing bracket Floor heaving
1 Maintenance Status of Main Roadway The main coal seam of Xingdong Coal Mine is 2# coal, the mining depth is from 600 m to nearly 1300 m. With the extension of the mine into - 980 m level mining, the roadway maintenance problem is increasingly prominent, the support body is seriously damaged, and the phenomenon of partial or even broken bolt is serious. The surrounding rock of the roadway expands, loosens, breaks, and has a large amount of deformation, as shown in Fig. 1. It has a very adverse impact on mine production and safety (He et al. 2011; Yuan et al. 2011; Wang et al. 2015; Kang et al. 2015). Three observation stations are set in - 980 m roadway, and Table 1 is the statistical table of three observation points. It can be seen from the table that the deformation rate of the roof and floor of - 980 m roadway is higher than that of the two ribs, and the maximum deformation rate is 2.48 mm/d. According to the characteristics of surrounding rock deformation and engineering technology in Xingdong Mine, the following three different support technologies are adopted: the combined reinforcement technology of roadway bolting and shotcreting, the support technology of floor anchor cable and the support technology of fully enclosed U-shaped steel ring support, which are described as follows.
J. Shi (&) J. Feng R. Peng School of Safety Engineering, North China Institute of Science and Technology, Yanjiao Town, East of Beijing 065201, China e-mail: [email protected]
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Geotech Geol Eng
Fig. 1 Roadway damage map Table 1 Statistical table of surface displacement of each measuring station Name of station
Maximum movement of two ribs/mm
Approach speed of two ribs/mm
Maximum approa
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