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考虑采动应力场、岩体承载性能和支护结构强度等因素,分析沿空留巷跨高比对围岩变形的影响,采用数值计算方法对比分析9种不同的跨高比留巷方案,结果表明优化留巷断面形态可充分提高留巷围岩的稳定性和抗变形能力。当巷道高度确定时,随着跨度的降低留巷围岩塑性区分布范围及变形量都不断减小;当巷道高度超过3 m时,围岩变形对跨度降低的变化更为敏感,且跨高比低于1.3时效果明显。在此基础上提出了大采高留巷最优跨高比的确定方法和留巷围岩控制思想,在4.2 m大采高工作面,留巷高度3.8 m、跨高比取0.79,工程实践取得成功。
Considering the mining stress field, the bearing capacity of rock mass and the strength of supporting structure, the influence of the span-height ratio of the gob-side entry retaining on the deformation of the surrounding rock is analyzed. Nine different schemes of the gob-side entry retaining are compared and analyzed by numerical method. The results show that the optimization of roadway profile can fully improve the stability and deformation resistance of surrounding rock. When the height of roadway is determined, the distribution range and deformation of plastic zone of surrounding rock decrease with the decrease of span. When the height of roadway exceeds 3 m, the deformation of surrounding rock is more sensitive to the decrease of span, Than when the effect is obvious than 1.3. On the basis of this, the method of determining the optimal span-height ratio and the control thought of surrounding rock stay-alley are put forward. At 4.2 m large mining face, the height of retaining lane is 3.8 m and the span-height ratio is 0.79. Success.