The selecting type of the support and roof control in soft rock coal seam floor

Leaving bottom coal and increasing the area of base of support and different combinations were calculated by using numerical simulation method to determine a reasonable parameters and programs.According to the force characteristics of the stents,the stent setting load and resistance were determined,and then stent-type was determined.Through monitoring the state of Xixi Mine working face's supports,stents in the initial pressure and pressure cycle to behave were at work.,which proved the selection of the stent and support program were correct.