Study Of Theory And Experiment On The Small Coal Pillar Entry Retaining In Comprehensive Mechanization Caving Face

To solve the problems presently such as Herculean rock engineering exists at gob-side entry excavating in comprehensive mechanization caving coalface, difficult drivage and ventilation in single road in crossheading from far distance, this paper studies and puts forward two-roadway layout system with small coal column in thick coal comprehensive mechanization caving coalface. According to the pressure observation resources in comprehensive mechanization caving stope, it firstly studies the structure and behavior of top-coal and roof in fully mechanized caving face, and the deformation regularity of lateral top-coal and roof, provides the basis for entry retaining design; then it completely studies the stability, deformation mechanization of coal pillar and bolting-mesh consolidation principle in entry retaining by use of theory analysis and numeric simulation. This article puts forth the rational coal pillar size and the support control scheme in entry retaining for 3302 working face in xinglongzhuang in terms of its conditions. And now it has been taken into practice. By observing the surface dislocation in entry retaining, haulage deep dislocation, roof separation, pressure on anchored bars and hydraulic props, the entry retaining deformation regularity in comprehensive mechanization caving coalface, pressure changes on bolts and the influential area of lateral pressure have been grasped. It also provides a lot of latest resources for two-road layout in entry retaining with small coal pillar and haulage support, and beneficial application in the same conditions.