Large deformation characteristics and stability control of roadway with fractured rock mass

To solve the rock stability and control issuesaround deep roadway with fractured rock mass in Mukong coalmine, the main factors affecting the rock deformation in + 600m (east wing) main haulage roadway were analyzed through adopting multiple methods of field survey and test, laboratory mechanics test, theoretical analysis and field experiments. Results show that the roadway tends to experience large deformation. The stress distribution is complex and surrounding rocks distribute in the form of zonal rupture. Meanwhile, the joint fissure develops well, forming the cataclastic structure. Rock mechanics test results show that the mechanical properties of rock are obviously different, and the rock mass is greatly affected by structures or structural planes. At the same time, the stability of some typical sections in the roadway are graded and described, which are mostly V or IV. Therefore, the comprehensive control principle and key technologies were put forward based on the deformation characteristics of roadway surrounding rock. In the engineering practice, "the bolt, cable and two-stage grouting shell" combined support technology were carried out. This technology focuses on "sub-strengthening support and internal & external bearing". According to the monitoring results, the deformation of roadway surrounding rock after adopting new support technique is within a controllable range,with the final de-formation rate being less than 0.2mm/d. © 2019, Editorial Board of Journal of Mining & Safety Engineering. All right reserved.