不同原岩应力方向下石门揭煤时应力与位移演化特征

发布时间：2018-04-06 22:32

本文选题：煤与瓦斯突出　切入点：石门揭煤　出处：《煤炭科学技术》2017年10期

【摘要】：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。
[Abstract]:In order to study the relationship between the outburst risk of coal uncovering and the stress of the original rock, the evolution characteristics of stress and displacement in the whole process of uncovering the coal in Shimen roadway with different angles between the maximum horizontal principal stress and the roadway are studied by using the method of theoretical analysis and numerical simulation.The results show that the Bailongshan coal mine belongs to the typical 蟽 -H type tectonic stress field. When Shimen drivage to the interface of coal and rock, the surrounding rock appears obvious stress concentration, and the danger of outburst is strong, the coal body is deformed and destroyed seriously during the coal gate stage.With the increase of the angle between the Shimen and the maximum principal stress, the stress concentration factor and the gradient of displacement change gradually increase, the stability of the stone gate decreases and the outburst danger increases, and the stress concentration deviates to one side at the angle of 15 掳to 75 掳.When the angle is large, the coal body should be strengthened and the roadway side should be strengthened while the pressure-relief is carried out.
【作者单位】：中国矿业大学安全工程学院;煤炭资源与安全开采国家重点实验室;四川川煤华荣能源股份有限公司小宝鼎煤矿;
【基金】：国家重点基础研究发展计划(973计划)资助项目(2011CB201205) 国家自然科学基金资助项目(51074161) “十二五”国家科技支撑计划资助项目(2012BAK04B07)
【分类号】：TD713

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