Research On Laws Of Underground Pressure In Fully-mechanized Face Of Nanliang Mine

Nanliang coal mine is on the edge of the local mining district of the Jurassic oalfield ,it is a shallow seam.For a long time , this mine uses room and pillar mining method,this method is labor intensive and the extraction rate is low,also, the security is difficult to be gu- anteed.For this reason,fully mechanised mining method was used in 2009. shallow seam fully mechanised mining mine coal seams intermixed with crushed into the mining early, that will seriously affect the safety of the face, so it was necessary to the Nanliang 20115 fully mechanised mining face the pressure to study laws.On the basis of a great deal of field pressure observation , with the results of the similar armaterial simulation experiment and theoretical analysis ,this article gives a research and analysis of mine ground pressure law of Nanliang coal mine's 20115 fully mechanized face.The main roof's initial pressure pace of 20115 fully mechanized face is 50m and the periodic pressure pace is about 11m on the base of practical observations(50m,10.9m),Resemble simulation(40.2m,11.3m) and theoretical analyse(47.8m,13.8m);the relationed data is 1.35(of practical observations) and 1.13(of resemble simulation); support resistance is 5373.5kN(of practical observations),5219kN(of resemble simulation)and 5918kN(theoretical analyse),the result is identical fundamentally; The mine ground pressure behavior is not violent ,The proportion support resistance exceed the rated working resistance is only about 5%,the overburden rock didn't appear the integral breaking of the whole overlying strata,four-column hydraulic shield support of type ZZ6800/14/27 can effe ctively control the roof; The results of the similar material simulation experiment shows that:6000kN of support resistance is enough to balance the pressure of overlying rock and effectivly control the roof;Subsidence zone of overlying rock does not appear; The boundary between caving zone and fracture zone is not obvious, it didn't form the "three zones" in common condition; Su bsidence law of the lower strata follow the bottom-up rule while of the upper strata is unexpected . 20m' length of gateroad's leading support is enough to meet the requirements of roadway protecting ; 20m' width of chain pillar between two faces is enough.The result of study have direction meaning for the minging of 20115 work face of Nanliang coal seam.