Pressure Distribution and Deformation Control of Gob-Side Entry Retaining Formed by Roof Cutting Influenced by Abandoned
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ORIGINAL PAPER
Pressure Distribution and Deformation Control of Gob-Side Entry Retaining Formed by Roof Cutting Influenced by Abandoned Roadways Xiaojie Yang . Lin Hou . Haojie Xue . Di Yuan . Jindong Cao . Zijie Han . Yubing Gao
Received: 11 September 2020 / Accepted: 16 November 2020 Ó Springer Nature Switzerland AG 2020
Abstract To explore the influence of abandoned roadways on the technology of gob side entry retaining formed by roof cutting and pressure release, theoretical analyses, numerical simulations, and field engineering experiments are adopted to study the mining pressure distribution law, plastic zone evolution characteristics and surrounding rock control measures when the working face crosses an abandoned roadway. Mining to the vicinity of the abandoned roadway is equivalent to the process of recovering coal pillars. During the mining process, the width of the coal pillar decreases. Under the influence of mining pressure, the coal pillar will gradually lose its bearing capacity. The overburden rock gravity originally borne by the coal pillar will transfer to the retaining roadway and the coal seam in front of the abandoned roadway. Therefore, it is necessary to strengthen the support of the retaining roadway to prevent large deformations due to the sudden increase in pressure. Within 20 m
X. Yang L. Hou H. Xue D. Yuan J. Cao Z. Han Y. Gao State Key Laboratory for Geomechanics and Deep Underground Engineering, Haidian District, Beijing 100083, China X. Yang L. Hou H. Xue D. Yuan J. Cao Z. Han Y. Gao (&) School of Mechanics and Civil Engineering, China University of Mining and Technology Beijing, Haidian District, Beijing 100083, China e-mail: [email protected]
near the abandoned roadway, based on the original NPR constant resistance large deformation cable (CRLD cable) support scheme, the second row of the CRLD cables is densely arranged, and the cable spacing is encrypted from 2400 to 800 mm. The successful application of these research results in actual engineering applications can provide a useful reference for working faces under similar geological condition. Keywords Roof cutting and pressure release Abandoned roadway Pressure distribution Surrounding rock control
1 Introduction With the reduction in coal resources, the mining depth continues to increase, and the geological conditions of mining are becoming increasingly complex. The traditional mining method requires a coal pillar to be located between the adjacent working face to ensure safe mining conditions, which will cause a large waste of coal resources, increase the amount of roadway excavation, and induce frequent safety accidents in the working face, especially under complex geological conditions. Therefore, the nonpillar mining method has rapidly developed. In 2008, He et al. (2017) proposed the theory of a ‘‘roof cutting short-wall beam’’, and based on this, formed gob-side entry
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Geotech Geol Eng
retaining by roof cutting and pressure releasing
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