Abstract
KEYWORD: Soft coal roadway; Dynamic mining pressure; Surrounding rock control; Optimization support ABSTRACT: In light of the coal roadway deformation and breakage problems in soft rock conditions under dynamic pressure influence, based on coupled-suppo rting principle, combined theories and computer numerical simulation, the floor heave and spalling mechanism under the influence of multiple mining activities were analyzed and a rational pillar size was calculated and bolt-cable coupling improvement support projects were designed on the basis of the original support plan. The study result shows that it was expansion-flexural composite of floor heave and rib spalling affected by coal pillar size. It can effectively control the volume expansion at the roadway bottom plastic zone and reduce the impact of the surrounding rock pressure of two sides on the floor by increasing coal pillar size to 25m and using add floor rock bolt & increase support density in two sides of roadway & enlarge anchor length comprehensive reinforced support means.
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