Experimental Study On Arch Arrangement Of Anchors Of Mining Roadway

Coal production has the most remarkable feature of underground work and laneways are arteries of coal mine tunnel production the length of gateway laneways in coal mine laneways is more than 60%. It has important significance for safety production and improving coal mine economic benefits to guarantee smoothness of gateway laneways and enable the gateway laneways to be in perfect states. The gateway laneways mainly serve mining area the cross section shapes are trapezoidal and rectangular shapes mostly the characteristics of gateway laneways are that they are greatly subject to influence on coal layer mining the maintenance difficulty is big and the supporting cost is high. Thereby the exploration of correct laneway supporting theories and selection of right supporting modes and supporting parameters are major issues which are studied by experts and scholars in the field of mining for long time. This paper mainly researches on the forced states and breaking deformation conditions of laneway surrounding rocks of the gateway laneways under different anchor arrangement modes:The combination arch theory of anchors is taken as guidance to carry out theoretical analysis to the mechanical properties of carriers formed by the laneways under the anchor supporting conditions.Similar material simulation is used to carry out systematic comparison research on deformation breaking characteristics and surrounding rock stress states of laneway surrounding rocks under normal arrangement of anchors and the arch arrangement conditions of anchors of the gateway laneways and it is obtained that the laneway surrounding rock displacement of anchor arc arrangement mode is smaller than the displacement of the laneway in the normal arrangement mode and the surrounding rock stress conditions are improved to a certain extend.Through large-scale finite-difference numerical simulation software FLAC3D, three-dimensional numerical simulation is carried out to two anchor arrangement modes of the gateway laneways and the obtained conclusion of similar material simulation is well verified.