残煤复采工作面支架初撑力与工作阻力确定
Determination Support Setting Load and Working Resistance in Residual Coal Repeated Mining Face
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摘要: 对于旧采采用“挖顶弃底”方式所残留的复采工作面，由于其顶板为采空区-煤柱不规则交错状态，工作面支架初撑力与工作阻力的传统确定方法不能适用。考虑到顶板上方为完全采空状态的复采工作面初撑力过高易顶破顶煤以及顶板上方的残留煤柱，存在集中应力与工作面老顶垮落等影响因素，运用相应的力学模型分析其支架-围岩关系，计算采空区与煤柱2种不同状态顶板下方复采工作面支架初撑力与工作阻力，给出的计算公式在现场工程实践中得到验证。Abstract: As for the repeated mining working face of second mining resulted from the old method of "digging top coal and leaving bottom coal", the roof of which is random with goaf and pillars mixed, the defining methods for setting load and working resistance used in common working faces are not suitable. In consideration that the setting load in goaf is too high to break the top coal, as well as the concentrated stress under the pillars and the collapse of old roof, support and surrounding relationship was analyzed by using corresponding mechanical models.The support setting load and working resistance of repeated mining face under goaf and pillar two different state roof were calculated. The proposed quantitative calculation formula was also verified in the field of engineering practice.
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Keywords:
- residual coal repeated mining /
- goaf /
- coal pillars /
- setting load /
- working resistance
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