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Title: |
Technology of Gob-side Entry Retaining in Steep Soft Outburst Coal Seam |
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Source: |
International Mining Forum (IMF 2010 E-BOOK)
(pp 91-95)
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Author(s): |
Yongkui Shi, College of Natural Resource and Environment Engineering, Shandong University of Science and Technology,Qingdao, China
Hu Yuan, College of Natural Resource and Environment Engineering, Shandong University of Science and Technology,Qingdao, China
Huanming Wang, Liziya’nan Colliery, Guangneng Group Co., Guangyuan, China |
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Abstract: |
Through the establishment of a mechanical model of stope structure, the scope of internal stressfield was forecasted, and the width of the coal pier in gob-side entry retaining was determined based on this.Aim at the seven stages of surrounding rock deformation in gob-side entry retaining, the supporting measuresof gob-side entry retaining which is based on the dynamic of stratum was taken to design the control of surroundingrock in different roadways. Especially for the features of the violent deformation of surroundingrock and the extremely soft characteristic of coal pier coal which appeared in the process of gob-side entry retainingin the rear area of upper section working face, in order to prevent the coal pier from being crushed andbecoming instability in the process of sinking and bending of the rear rock beam, a technology of roadwayprotection called ‘intensive roadside bolting system’ was used. Practice has proved that it meets the safety oftransportation, walking and ventilation. Gob-side entry retaining achieved technically feasible, safe reliable,economically rational effect.
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