Surrounding Rock Control And Support Research Near Roadway Excavation Face Based On Nonlinear Damage

the excavation of the roadway will cause the stress distribution within the surrounding rock to form deformation and damage.In order to ensure the stabilization and normal use of the roadway,it is necessary to study its stability and effective support.In this paper,According to deep roadway nonlinear mechanical response and damage characteristics of rock mass destruction,and internally generated from rock damage mechanism of expansion of micro-cracks,nonlinear damage constitutive model("straight line-curve-straight line" Constitutive model)was put forward,concluded the formula of stress distribution and fractured range of circular roadway within isobaric loads,and obtained the equilibrium equation of surrounding rock..while the mechanical model of interaction between surrounding rock and support was established based on spatial effect of excavation face,the roof rock-supporting forces in the interaction process real-time interaction and analytical equilibrium was studied.On this basis,The effect of the initial damage D0,nonlinear softening parameters β and damage rate coefficient k on plastic damage zone radius,flow damage zone radius and displacement has been analyzed,the influence of supporting opportunity and support strength on the supporting effect has also been analyzed further.In this paper,the roadway group of the bottom pit of Liuzhuang coal mine is used as the engineering background to analyze the different supporting time(0.2m,1m and 2m respectively)and the different supporting strength(three support scheme)respectively.Then,the displacement of the surrounding rock surface and the depth of the rock mass is monitored in situ.The monitoring results verify the correctness of the research results.The research results of this paper can provide theoretical basis for the stability analysis of roadway and provide some reference for the determination of effective support.