School of Safety Engineering, China University of Mining and Technology State Key Lab of Coal Resources and
Safe Mining Xiaobaoding Mine, Huarong Energy Company Limited, Sichuan Coal Group

为了研究石门揭煤突出危险性与原岩应力的关系,采用理论分析与数值模拟的方法,研究了石门巷道与最大水平主应力呈不同夹角情况下,揭煤全过程的应力、位移演化特征。结果表明:白龙山煤矿属于典型的σ_H型构造应力场,当石门掘进至煤岩交界面处,围岩出现显著应力集中,突出危险性强;过煤门阶段,煤体变形、破坏严重;随着石门与最大主应力夹角的增大,应力集中系数及位移变化梯度逐渐增大,石门稳定性降低,突出危险性增强;夹角在15°~75°时,应力集中偏向一帮。揭煤石门应尽量平行于最大水平主应力掘进,夹角较大时,应在实施超前卸压的同时强化煤体、加固巷帮。

In order to study the relationship between the outburst danger of the seam opening in the mine cross cut and the in-situ stress, a theoretical analysis an d numerical simulation method were applied to study the stress and displacement evolution features during the full process of the seam opening when the mine cross C ut and the max horizontal stress was in a different included angle. The results showed that Bailongshan Mine was a typical tectonic stress field. When the mine cross cu t was headed to the coal and rock interface, a remarkable stress concentration was occurred in the surrounding rock and the outburst danger was high. After the stage of the coal cross cut passed, the coal mass would be deformed and seriously failed. With the cross cut and the max principal stress included angle increased, the stres s concentration coefficient and the displacement variation gradient would be steadily increased, the stability of the cross cut would be reduced and the outburst danger could be increased. When the included angle was 15° ~ 75°, the stress would be concentrated to the wall. The heading of the seam opening cross cut should possibly b e paralleled to the max horizontal principal stress. When the included angle was high, while an advance pressure releasing conducted, the coal seam should be enhanc ed and the mine roadway sidewall should be reinforced.