Research on the Deformation Mechanism and Reinforcement Technology of Surrounding Rocks in the Mining Roadway of"Three Soft"Coal Seam
Aiming at the serious deformation of roadway surrounding rock in"three soft"coal seam,taking the return airway of 1307 working face as the engineering background,through the combination of indoor tests,numerical simulation and industrial tests,the mechanical properties and deformation failure mechanism of roadway surrounding rocks were researched,and a roadway reinforcement technology was proposed and applied.The results show that the mineral composition of the roadway surrounding rocks is relatively high,and the fracture development range of the roadway surrounding rocks under the original support scheme is large,the stress of the bolt cable is close to the breaking load,and the deformation of the surrounding rocks is serious.It is revealed that the unreasonable support scheme and poor mechanical properties of surrounding rocks are the mechanism of deformation and failure of roadway surrounding rocks.It is clear that the two sides and floor of roadway are the key parts for reinforcement control.The control countermeasures of"full-length bonding anchorage+side reinforcement+floor reinforcement"was put forward.The numerical calculation models of different support schemes were constructed,and the displacement and plastic zone distribution characteristics of surrounding rocks under different reinforcement schemes were obtained.Finally,the reinforcement parameters with good roadway control effect were determined.After the application of roadway reinforcement technology,the maximum deformation of roadway surrounding rocks is 156 mm.Compared with the original support scheme,the displacement of roadway roof-floor and two sides is reduced by 84％and 87％respectively.The roadway surrounding rock has been controlled stably.
"Three soft"coal seamDeformation and failure mechanismSurrounding rock reinforcementMechanical characteristicsNumerical simulation
NETL
NSTL
万方数据
