摘要
采用三维离散单元法对孤岛煤柱区巷道围岩破碎范围的发育规律进行了理论分析。高应力区巷道围岩破碎范围普遍较大,但其水平位移不再明显发展;高应力区的小煤柱已充分预发育裂隙,且水平位移大,应力水平降低。通过实践,发现探地雷达技术是现场测定巷道围岩破碎区的有效方法,并定性地验证了三维离散元法的理论研究成果,对采煤工作面现场上下顺槽的位置选择具有指导意义。巷道围岩破碎区的探地雷达现场探测条件与建立的数值模拟条件相一致,通过理论与实践的结合,确定距采空区一侧边缘5～8m为该条件下巷道布置的合理位置。
Developing features of fractured zones of roadway in isolated coal pillar area are theoretically studied by three dimensional distinct element code (3DEC). It is found in this paper that fractured zones of rock masses in high stress area are larger than those of others, but their horizontal displacement does not increase obviously. Small coal pillar in high stress area has pre-developed splits and large horizontal displacement, and its stress concentration degree is lower. For application in site, ground penetrating radar (GPR) is an effective method to determine the fractured zone and can be used to verify the theoretic results of 3DEC, which is important to locate roadways in site. GPR probing in field agrees with the result of numerical model of 3DEC. Therefore, the combined results of both stimulation and site probing present the reasonable position of roadway, which is 5-8 m to adjoining pits in the presented case.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2004年第14期2413-2416,共4页
Chinese Journal of Rock Mechanics and Engineering
关键词
采矿工程
高应力区
破碎区
三维离散单元法
探地雷达
Computer simulation
Ground penetrating radar systems
Mining engineering
Stress analysis
Three dimensional
Wall rock
