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Flexible Support Technique for the Weak Roof and Floor of a Roadway in a Coal Seam with a Medium-Thickness and a Large Inclined Angle
1 College of Resources and Environmental Science, Chongqing University 2 State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University 3 Sichuan Coal Group Guangwang Company
Abstract It is difficult for old methods of support to meet the stability requirements for a roadway in a semi-thick coal seam with a large inclined angle and to provide "gob-side" entry retaining due to gangue caving. Therefore, a flexible support technique is proposed in this paper: utilizing the protective covering zone formed by gangues that have caved in on specialized steel mesh to allow a certain settlement of the roadway roof and provide support for the combined rock beam structure above the roadway roof. Based on the construction process and field tests, the laws of strata pressure behavior, roof movement, the stacking of collapsed gangues and steel mesh deformation were obtained, proving the availability of this technique on the basis of a bolt-mesh-cable-pillar combined support.
Abstract：
It is difficult for old methods of support to meet the stability requirements for a roadway in a semi-thick coal seam with a large inclined angle and to provide "gob-side" entry retaining due to gangue caving. Therefore, a flexible support technique is proposed in this paper: utilizing the protective covering zone formed by gangues that have caved in on specialized steel mesh to allow a certain settlement of the roadway roof and provide support for the combined rock beam structure above the roadway roof. Based on the construction process and field tests, the laws of strata pressure behavior, roof movement, the stacking of collapsed gangues and steel mesh deformation were obtained, proving the availability of this technique on the basis of a bolt-mesh-cable-pillar combined support.
.Flexible Support Technique for the Weak Roof and Floor of a Roadway in a Coal Seam with a Medium-Thickness and a Large Inclined Angle[J] MODERN TUNNELLING TECHNOLOGY, 2015,V52(2): 198-204
2015, Vol. 52 