Comprehensive investigation on roadway intersection stability of coal mines in China
There are large numbers of roadway intersections constructed annually in Chinese coal mines with various geometries, such as, three-way intersection, four-way intersection, two dimensional roadway intersection and three dimensional roadway intersection, etc. With continually increasing the depth of cover, the stability of roadway intersection is susceptible to ground control problems due to inherently wide roof spans and complicated intersection geometry used. The paper presents the comprehensive results obtained from the field monitoring and numerical modeling related to the stability of the roadway intersection in coal mine. Firstly, the basic geomechanical behavior of roadway intersection has been determined by using underground monitoring in great depth of cover, and then the numerical modeling is conducted to determine the stability behavior of intersection associated with the different geometrical shapes, the depth of cover, and construction sequence and direction on the stability of intersection. The results clearly indicated that large span of the opening and great depth of cover are major factors, which may influence the stability of the roadway intersections. Comparing different geometrical shapes of the two-dimensional intersections, the most unstable one is the cross-intersection, and results indicated that the construction sequence and direction are also sensitive factors for the stability of roadway intersection.
T.K.Lu X.Chen B.H.Guo J.S.Mao
School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, Henan, China School of Civil Engineering, Xian University of Science and Technology, Xian, Shanxi, China
国际会议
香港
英文
1-6
2009-05-19（万方平台首次上网日期，不代表论文的发表时间）