ABSTRACT:

The failure mechanism of haulage gate surrounding rock in 402103 fully-mechanized top-coal caving face of some deep coal mines of Bin-Chang Mining Region in Shan-xi province are studied. The results show that haulage gate surrounding rock in deep coal mine has the characteristics of big deformation, asymmetry stress distribution of surrounding rock complex. Based on the support idea, which is first pressure released, second pressure relief, third anti-pressure, support and on-site monitoring program for haulage gate in 402103 fully-mechanized top-coal caving face is carried out. The practice shows that the design support parameters of crossheading are reasonable, and the supporting effect meets the needs of safety production.

1 INTRODUCTION

With the increase of the mining depth, geological environment becomes more complex; the roadway surrounding rock shows characteristics of large deformation, high stress and sustainable creep, and the risk of roadway rock burst has been increased greatly. At the same time, deep roadway is influenced by high temperature, high confining pressure and high pore pressures; Deformation of the surrounding rock in roadway shows new characteristics that are different from shallow tunnel.

Domestic and international scholars have conducted extensive research on the issue of deep roadway support (He et al. 2007, Kang et al. 2010, N. Zhang et al. 2009, Bai et al. 2007). But the research on the issue of roadway support in special thickness coal of deeply buried coal mine was relatively less.

In order to ensure the safety of construction, the research on the issue of roadway support in special thickness coal of deep buried coal mine is necessitated; we should put forward reasonable and feasible supporting solutions, and provides a reference for other roadway support of deep buried coal mines in the west. Take the support problem in concern, a support scheme is proposed and engineering practice and deformation monitoring are carried out.

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