Research on Coupling Control Technology of Constant Resistance in Gob-side Entry Under Mined Gob of Recent Coal Seam Gro
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ORIGINAL PAPER
Research on Coupling Control Technology of Constant Resistance in Gob-side Entry Under Mined Gob of Recent Coal Seam Group Yong Zhang . Xing Xia . Xiao-ming Sun . Peng Song . Jian Wang . Shi-jie Sun . Chen Chen
Received: 22 March 2019 / Accepted: 18 April 2020 Ó Springer Nature Switzerland AG 2020
Abstract Taking the deep gob-side entry under the mined gob in the Nantun coal mine as the background, indoor physical mechanic property research, situ engineering geomechanics analysis, theoretical formula analysis and three-dimensional numerical simulation were adopted. The type of deformation mechanism of this roadway was confirmed. The coupling control technology of constant resistance was proposed and used in practice successfully in situ engineering. Practice was proved that the coupling technology of constant resistance based on NPR bolt could absorb the energy accumulated in surrounding rock and ensure the total safety of the roadway. Keywords Recent coal seam group Gob-side entry Numerical simulation Coupling support NPR bolt
Y. Zhang X. Xia (&) X. Sun P. Song J. Wang S. Sun C. Chen School of Civil and Architecture Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China e-mail: [email protected] Y. Zhang X. Xia X. Sun P. Song J. Wang S. Sun C. Chen State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
1 Introduction With the rapid development of economic construction, a large number of coal mines have been transferred to the end mining period after decades of mining. Due to long-term exploitation, coal resources are decreasing increasingly, and resource exploitation is gradually shifting to the depths. At the same time, with the mining of the mining face with less difficulty in mining, the mining work is bound to turn to the gobside working face or even the island working face. Therefore, the working face tends to the deep and multiple gobs around the working face is the two most prominent characteristics of the coal mining in the end mining period. With the increase of the mining depth, nonlinear physical mechanics phenomenon in engineering rock mass, this depth and the depth interval below are called deep. In deep engineering, due to the influence of ‘‘three highs and one disturbance’’, the geological environment is complex, and underground geological disasters are serious. Rock bursts, gas explosions, water inrush and heat disasters occur frequently, which seriously affects the state property and people. Deep engineering has become the focus and difficulty of coal mining projects in the world (He 2014; He et al. 2005a, b; Song et al. 2010; Yuan and Harrison 2004). The mechanical environment of gob-side entry driving and solid coal roadway driving is different. There is a fractured zone and a plastic zone in the coal
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Geotech Geol Eng
after the peak of the relatively low stress stat
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