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中文摘要：
岩层关键层对大断面巷道围岩的变形破坏起着决定性的作用。以五阳矿7602综采面为地质模型，通过不连续变形数值方法，模拟分析了主关键层厚度对大断面巷道的变形影响。研究表明，大断面巷道存在一个临界关键层厚度，当关键层厚度超过这个临界值时，巷道的变形很小，可不采取加固措施；但当关键层厚度小于该临界值时，巷道围岩存在一定变形，严重时需要采取加固措施。五阳煤矿的老顶只有8m左右，需采取相应的加固措施；类似于五阳煤矿相似地质条件的大断面巷道，如果要保持稳定，临界关键层厚度应该达到12m左右。
英文摘要：
The key stratum of rock has decisive function on deformation and failure of surrounding rock of large section roadway. Taking 7602 fully mechanized mining face of Wuyang Mine as the geological model, with discontinuous deformation numerical method, the paper simulates and studies the effect of main key stratum thickness on deformation the large section roadway. The research results show that there is a critical thickness of key strata in large section roadway. When the key strata thickness exceeds the critical value, the deformation of roadway will be very small, and it need not take any reinforcing measures; however, when the key strata thickness is less than the critical value, large deformation will emerge in roadway surrounding rock, and it needs to adopt reinforcing measures. The thickness of main roof in Wuyang Mine is only about 8 meters, and the corresponding reinforcing measures are necessary. Any large section roadway with similar geological conditions with Wuyang, the critical thickness of key stratum should be about 12 meters to maintain the roadway stability.
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