Comprehensive Evaluation Of Roof Stability Of10th Seam In Luling Coal Mine

Luling coal mining is located at about20kilometers away in the southeast of Suzhou City,82kilometers away of the northwest on Huaibei City, is a big mine belonging to Huaibei minning group company. This coal mining build well in the year of1960, it began production in the year of1969. Up to the present, its production capacity is about200t a year.The10coal seam is the main minable seam of Luling coal mine in this study, located in middle of shanxi group, many is the single coal seam. The single coal seam is stable, Structure is simple. Accoading to borehole data,we know there only have13well see the dirt band,a single layer thick is0.14-0.63meters, average is0.26meters;can be mining thick is0.74-6.85meters, average is2.75meters. The10coal seam has three sections:the east of11-12prospecting line,11-12prospecting line to fault F7-1and fault F7-1to west of mining limit. Go by the click on calculate, only the east of11-12prospecting line is not stable coal seam, others is stable.This study is based on the collecting of Luling coal minning date. Analysising and researching the underlying, coal bearing situation, thickness disthribution characteristics and roof sedimentary characteristics. Clearing up the drilling date, using the3-D modeling technology of GOCAD software, build geological body3d model of10coal seam of Luling coal mine, reproduced the internal details of geological body. Inverting the in-situ pressure of10coal seam, get the pressure field distribution characteristics. With the help of the RFPA, to the roof crack characteristics for numerical simulation of working face. The last, using the AHP of fuzzy comprehensive evaluation method and based on stacking technique of software GIS, for thebasic roof to comprehensive evaluation of10coal seam. According to evaluation results, the basic roof stability is divided into four kinds:the first kind is the comprehensive evaluation coefficient greater than0.8, referred to as roof pressure strong area; the second kind is the comprehensive evaluation coefficient between0.65to0.8, roof pressure is not high than the first kind; the third kind is the comprehensive evaluation coefficient between0.45to0.65, the roof pressure is not high than the seconds kind; the forth is the comprehensive evaluation coefficient lower than0.45, the roof pressure is not distinct. Accodding to the comprehensive result picture of10coal seam, we can see that the first kind and the second kind mainly distributed in superficial part and the second level of the coal mining; the third kind is distributed in third level and northern region; the forth is distributed in third level region.