文献类型：期刊文献

英文题名：Engineering characteristics and deformation control of roadways in fractured rock mass [裂隙发育岩体巷道围岩工程特征与变形控制]

作者：Yu W. Li K. Lu Q. Guo H. Du S.

通信作者：Li, K.[1,3]

机构：[1]School of Resource & Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan, 411201, China;[2]Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal Mines, Hunan University of Science and Technology, Xiangtan, 411201, China;[3]College of Mining, Guizhou Institute of Technology, Guiyang, 550003, China

第一机构：School of Resource & Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan, 411201, China

年份：2021

卷号：46

期号：11

起止页码：3408-3418

外文期刊名：Meitan Xuebao/Journal of the China Coal Society

收录：Scopus(收录号：2-s2.0-85108576113)

语种：英文

外文关键词：Controllable grouting; Coordinated load-supporting; Deformation control; Fracture investigation; Fracture reconstruction

摘要：The mining conditions of underground coal mines are complex. The development degree of surrounding rock fissures of underground roadways is high, significantly affecting roadways' stability and making a large number of them difficult to maintain. To further study the engineering characteristics of fractured rock roadway and put forward corresponding control measures, the deformation and failure characteristics of fractured rock roadway and typical supporting structure are analyzed based on field investigation and theoretical research. The fracture development in the coal mine is investigated and counted using three line discontinuity measurement method. The discrete fracture network (DFN) is used to reconstruct and restore the fractures obtained from on-site survey in FLAC3D. After comparing with the field monitoring data, it is considered that the fracture reconstruction model can be used as a qualitative reference for the comparison of the effects of different support methods in support design. The deformation and fracture characteristics of typical fractured roadway surrounding rock in some southern China mining areas are analyzed. Five control points of fractured rock mass are put forward, including improving the initial support stiffness and strength of the support system, making full use of the bearing function of deep stable rock mass, expanding the bearing area of the support system, accurately grasping the necessary support stiffness of the support system, especially the passive support and active support, and effectively improving the integrity and bearing strength of fractured rock mass. Using the bearing theory of superimposed compression arch, a combined control technology is proposed, which is based on the bearing system of "long-short" bolt (anchor cable) and the controlled grouting reinforcement of "internal-external" structure. Based on the numerical calculation, it is considered that the scheme can eliminate or reduce the tensile stress zone of the roadway surrounding rock, and effectively prevent the loose deformation caused by the tensile shear failure of the rock mass. Field tests were carried out at Mukong Coal Mine, Guizhou Province, China. The on-site monitoring data shows that the two sidewalls' approach distance is 0.1 m during the four-month observation period. The roof-floor's approach distance is 0.12 m. The final deformation rate is less than 0.2 mm/d, indicating that the support scheme of "long-short" anchor (anchor cable) combined with grouting reinforcement can effectively control the fractured rock roadway's large deformation. ? 2021, Editorial Office of Journal of China Coal Society. All right reserved.