Journal of Mining & Safety Engineering ›› 2012, Vol. 29 ›› Issue (4): 466-473.

Previous Articles     Next Articles

Strata Behavior and Control Countermeasures for the Gob-Side Entry Retaining in the Condition of Large Mining Height

  

  • Received:2011-11-17 Online:2012-07-15 Published:2012-05-23

Abstract: Combined with the production conditions of 24207 working face in Shaqu mine, distribution characteristics of roofs stress for gob-side entry retaining influenced by mining height was studied by the method of theoretical analysis and numerical simulation. Gob-side entry retaining is in the area of stress decreasing zone of bearing pressure area. The impact scope and range to the rock gets more widely with the increase of mining height of working face. Acute deformation will occur during the mining period for gob-side entry retaining, and the contraction of area will reach to 55.3% in the condition of large mining height. Effective supporting measures are required according to the deformation characteristics of each side in gob-side entry retaining. The optimal cross-height ratio and the high strength supporting system with the core of high pre-stress could be helpful to control the deformation of surrounding rock reasonably. The observation data shows that the violent mining influence extent to gob-side entry retaining is the ranges from working face to the rear of 200 m, which is similar to the length of working face in the industrial experiment. The deformation continues to grow and roof pressure continues to increase until the length extents 250 m the strata behaviors tends to stable.

Key words: large mining height, gob-side entry retaining, surrounding rock control, strata behaviors