摘要
为了保证近煤层岩巷的安全快速掘进，采用FLAC加分别对煤层距巷道底板5，10m时的情况进行了数值模拟，研究了近煤层岩巷掘进工作面前方岩层、煤层的应力分布规律，结果表明：煤层距巷道底板5m时，前方5～20m为煤层应力集中区；煤层距巷道底板10m时，其应力集中区在10～25m，其应力峰值处在煤层距巷道底板5m时的集中应力区与原始应力区的交界处。根据煤层应力集中区情况，建议煤层距巷道底板5m时必需采取防突措施，防突长度为掘进工作面前方20m，并进行了合理的钻孔设计。
In order to safely and rapidly excavate the mine rock roadway with a short distance to a seam, FLAC2D software was applied to the numerical simulation on the mine roadway floor with a distance of 5 and 10 m to seam and to study the stress distribution law of the rock strata and seam at the front of the rock roadway excavation face with a short distance to seam. The results showed that when the seam had a distance of 5 m to the rock roadway floor, the front 5 - 20 in of the face would be the seam stress concentrated zone. When the seam had a distance of 10 m to the rock roadway floor, the stress concentrated zone would be at front 10 - 25 in of the face. When the mine roadway floor with a short distance of 5 m to the seam, the stress peat would be located at the cross point between the stress concentrated zone and the original stress zone. According to the stress concentrated zone in the seam, it proposed that when seam had 5 m to the mine roadway floor, measures to prevent outburst should be taken. The length for the outburst prevention should be 20 m in front of the excavation face. A design on the rational borehole was conducted.
出处
《煤炭科学技术》
CAS
北大核心
2009年第10期31-34,38,共5页
Coal Science and Technology
基金
国家重点基础研究发展计划(973计划)资助项目(2005CB221503)
国家自然科学基金重点资助项目(70533050)
国家自然科学基金资助项目(50674089)
"十一五"国家科技攻关资助项目(2005BA813B-3-06)
关键词
近煤层岩巷
掘进工作面
煤与瓦斯突出
应力分布规律
mine rock roadway short distance to seam
mine roadway heading face
coal and gas outburst
stress distribution law
