Intelligent fully mechanized top-coal caving technology for large-depth,"three-soft",thick coal seams
Aiming at the hydraulic support sinking and roadway floor heave during fully mechanized mining for deep,thick,"three-soft"seams,taking No.818 intelligent fully mechanized face at Xinhu Coal Mine,Huaibei City,as the research background,the applicability and automatic system of hydraulic supports in No.818 intelligent mining face is analyzed and introduced.Through theoretical calculation,the max working resistance of the hydraulic support is 9940 kN.By analyzing the measured data in the field,it can be seen that the working resistance of the hydraulic support in the middle is the highest,followed by the lower part,and the top part is the smallest.The working resistance of the front column of the working face is larger than that of the rear column,during the working face weighting,the working resistance of the front column of the hydraulic support is 44.5% larger than that of the rear column on average,the ratio of the working resistance of the front column to that of the whole frame is roughly in the range of 0.57 to 0.74,and the average working resistance of the hydraulic support in the working face is 28.11 MPa.The method of calculating dynamic load is more suitable for calculating the working resistance of the hydraulic support in the working face of No.818.The reasons for hydraulic support sinking are analyzed,and the control measures of hydraulic support are proposed.Through numerical simulation,the influence range of the advance abutment pressure in working face is 110 m in front of the coal wall,the peak stress shows in the middle of the working face,followed by the lower part,and then the upper part,and the peak stress occurs at 12～19 m in front of the coal wall.The actual measurement data show that in the range of 105 m outward of the coal wall,the floor heave and the deformation of the two sides are relatively large,and the roof subsidence and floor heave are more obvious,based on which,the prevention measures for roadway floor heave is proposed to provide a reference for the working face in Huaibei mining area and similar conditions.
large depth"three-soft"coal seamhydraulic support automation systemsupport working resistanceadvance abutment pressure
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