Debunks Sudden Discrimination Method and Stability Analysis of Dissipative Energy in Roadway Surrounding Rock in Front of Coal Seam
Taking the-80 m North Stone Gate of Tanjiachong Coal Mine in Hunan Province as the engineering case,based on the energy principle and the cusp mutation theory,a criterion for sudden change of dissipative energy is established,which takes the total dissipative energy of roadway surrounding rock as variable.The evolution process of dissipative energy of roadway surrounding rock is analyzed,and the sudden change characteristic value Δ is proposed.It is found that the surrounding rock is stable when Δ＞0.When Δ＜0,the surrounding rock of roadway enters the unstable state.When Δ=0,the surrounding rock is in the critical instability state,and the surrounding rock is easily disturbed from the stable state to the unstable state.Based on the deformation and failure characteristics of roadway and the evolution characteristics of dissipated energy,the combined support method of"full section high-strength resin bolt+anchor net spray+high-strength elastic anchor cable"is proposed.The engineering practice results show that the combined support method can effectively maintain the stability of roadway surrounding rock.
energy conservation principlemutation theorydissipated energysurrounding rock control
万方数据
维普
