The Study Of The Influence Of The Spatial Asymmetry On The Stability Of The Surrounding Rocks

This paper USES the numerical simulation method to conduct single-axis compression numerical experiments of the surrounding rock,and the excavation simulation of different buried and deep,and analyzes the influence of the deformation and damage of the surrounding rock in the surrounding rock,and analyzes the change of the fracture process and mechanical properties of the surrounding rock,and analyzes the variation of the mechanical characteristics of the surrounding rock in the condition of the space asymmetry,and the results of the study are summarized as follows:(1)coal and rock failure mode basically is given priority to with fracturing,and mostly to damage caused by the destruction of the coal and rock specimens,the mechanical properties of the overall trend is the higher the peak intensity,with the increase of Angle of alpha = 90 °increase was most pronounced peak intensity,and the peak value of axial strain fluctuates significantly,and explain the complex surface of coal and rock assemblages and the horizontal Angle,the greater the The higher the roadway surrounding rock strength is,the more conducive to enhancing the stability of the roadway surrounding rock.When the local surrounding rock disturbed by mining slips and the composite surface has some initial damage,the peak strength of the composite body will decline as a whole,which is not conducive to the stability of the roadway surrounding rock.(2)When there is no initial damage of coal-rock combination,the rock sample changes from brittle failure to ductile failure and then from ductile failure to brittle failure in the process of inclination Angle α from0° to 90°;When the composite surface crack in coal and rock assemblages,surrounding rock mechanics properties is overall ductility enhancement,elastic modulus and peak strength increases with the increase of Angle and,coal and rock containing crack and coal rock combination and combination of elastic modulus and peak intensity with the increase of Angle is smaller,the overall gap with the size of the effective stress loading direction,the overall linear tends to a certain regularity.(3)The peak strength of coal rock and aggregate increases gradually with the ratio of diameter to height,and the main failure mode is splitting failure.The mechanical properties of coal rock fluctuate greatly,and the coal rock changes from brittleness to ductility,and then from ductility to brittleness.The ductile failure changes from brittle failure to ductile failure,but the ductility decreases gradually with the continuous increase of aspect ratio.The larger the diameter to height ratio is,the larger the gap between the aggregate and the peak strength of coal rock is,indicating that the larger the diameter to height ratio of the aggregate is,the better the stability of surrounding rock is.Of course,the larger the diameter to height ratio of coal rock is,the better the stability of surrounding rock is.For the peak axial strain,when the ratio of diameter to height of the composite increases to a certain extent,it is more beneficial to the stability of surrounding rock,while the axial strain of coal rock peak value does not change obviously.(4)The total displacement of the roadway is mainly influenced by the horizontal main stress,and the vertical main stress is gradually apparent when the depth of the buried depth increases,and the displacement of the roadway is gradually converted into the bottom plate,and the plastic zone increases the distribution range,and the main concentration is in the bottom plate of the roadway.When the roadway is coal lane,the surrounding rock is unstable and the whole is unstable.When the roadway is the rock lane,the surrounding rock is not easily broken and the whole liquid is more stable.When the roadway is semi-coal rock,the roadway is more stable near the rock column,and the severe overall performance of the surrounding rock fracture is unstable,and the construction of the surrounding rock is more and more serious,and the rock surrounding the shoulder Angle is easy to break.