Abstract
Taking gob-side entry retaining with large mining height (GER-LMH) of the 4211 panel in the Liujiazhuang coal mine as the engineering background, a numerical simulation was conducted to study the surrounding rock deformation, stress, and plastic zone distribution of GER-LMH with respect to retained entry width. The concept of critical retained entry width of GER-LMH was proposed. In view of the deformation characteristics of surrounding rock, an innovative approach to determine the critical width of GER-LMH based on the cusp catastrophe theory was proposed. The cusp catastrophe functions were set up by approximate roadside backfill body rib convergence and roof subsidence series with respect to different retained entry widths. The critical retained entry width of GER-LMH was 4.0 m according to bifurcation set equations. Surrounding rock stability control principle and technique of GER-LMH was proposed, including “rib strengthening and roof control”: road-in support with high pre-stress rockbolts and anchor cables, roadside backfill body construction technology with high-water quick consolidated filling materials and counter-pulled rockbolt, road-in reinforced support technology with hydraulic prop support and roof master. Field test and field monitoring results show that GER-LMH with supercritical retained entry width in the 4211 panel could meet the requirements for ventilation when the 4211 panel was retreating.
Highlights
Gob-side entry retaining (GER) was tested and applied in the UK, Germany, Poland, and Russia in the past few decades, while GER is widely applied in coal mining in China [1–7]
Liujiazhuang coal mine based on cusp catastrophe theory, proposes adaptive theory, proposes the adaptive surrounding rock stability control strategy of based surrounding rock stability control strategy of gob-side entry retaining with large mining height (GER-LMH) based on field tests, theoretical calculations, on field tests, theoretical calculations, and numerical simulations
GERwith withsupercritical supercriticalretained retained entry width was conducted in the panel, In the the field field test, entry width was conducted in the panel, and and the construction speed of the retained entry is
Summary
Gob-side entry retaining (GER) was tested and applied in the UK, Germany, Poland, and Russia in the past few decades, while GER is widely applied in coal mining in China [1–7]. The retained entry will be applied to the adjacent longwall panel Under this condition, the surrounding rock control of GER would by be longwall panel. Xue modeling and Han obtained deformation characteristics of the distribution characteristics of the entire section of the retained entry under the condition of. 4.2 m entire section of the retained entry under the condition of 4.2 m large mining height, and proposed large mining height, and proposed the GER-LMH strategy [17,19]. Liujiazhuang coal mine based on cusp catastrophe theory, proposes adaptive theory, proposes the adaptive surrounding rock stability control strategy of based surrounding rock stability control strategy of GER-LMH based on field tests, theoretical calculations, on field tests, theoretical calculations, and numerical simulations
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