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Safety in Coal Mines. 2013, (03) Core

Rib Spalling Characters and Its Stability Analysis at Fully Mechanized Caving Face With Great Mining HeightChinese Full Text

FANG Duan-hong1,LIU Pan2,3,ZHANG Feng-jie3(1.Gubei Coal Mine Branch Safety Training Center of Huaizhe Coal and Electricity Co.,Ltd.,Huainan 232150,China; 2.Provincal and MOE Joint Established Key Lab of Coal Mine Safety and High Efficient Mining,Huainan 232001,China; 3.School of Energy and Safety,Anhui University of Science and Technology,Huainan 232001,China)

Abstract: Two kinds of mechanical model are used to analyze coal wall stability of fully mechanized caving face with great mining height,the research shows that instability position of coal wall is away from the roof of 0.35~0.5 times of the mining height.And simplified the spalling coal body into a single sliding surface model,a stability coefficient K is got through the mechanical analysis.if K＞1,glide force is bigger than resistance and rib spalling happens;if K=1,coal wall is in limit equilibrium state;if K＜1,this means that wall is stable.In addition,from the expression of K,it concludes that as the greater of the internal frictional angle and cohesion of coal is,the greater stability of the wall is;when mining height and roof pressure increases,the wall is easier to spall.According to the field practice,taking the steps that injecting Malisan to enhance coal shear strength,strengthening the roof and wall’s support,speeding up the work-face advance rate,and removing the frame in time and so on could reduce rib spalling and enhance the stability of the coal wall.
Keywords：

rib spalling; pressure bar theory; sliding surface; stability coefficient;

  • DOI：

    10.13347/j.cnki.mkaq.2013.03.058

  • Series：

  • Subject：

  • Classification Code：

    TD32

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