上湾煤矿8.5 m采高综采面液压支架关键参数分析

Analysis of the technical parameters of the hydraulic support at 8.5 m mining height face in the Shangwan’s Coal Mine

为保障8.5 m超大采高综采面的安全生产,采用工程类比、理论分析、数值模拟的方法,综合确定液压支架关键参数。根据来压前支架受静载荷的特点建立力学模型,并通过现场实测验证其可靠性;运用FLAC2D二次开发,采用YY-YY结构作为等效支架来分析支架的支护强度,以提高结果的科学性与准确性。结果表明：8.5 m采高综采面顶板厚度约20 m,初次来压步距约56 m,周期来压步距约21m;垮落带高度60 m,裂隙带高度120 m,发育至地表;液压支架支护强度为1.8 MPa,高度为4.0~8.8 m,工作阻力26 000 k N。

The paper is to engage itself in a comprehensive analysis of the better economic and social benefits that is likely to be gained on the condition that the longwall panel is extracted with the mining height of 8. 5 m（ the highest mining height in the world）. To ensure the safety construction of the 8. 5 m mining height working face,the paper has done a theoretical analysis and similar material simulation to trace and determine the regularity and rationality of the strata movement. And,for the given research purpose,we have done a theoretical analysis,an engineering analogy and necessary numerical simulations in hoping to determine the key parameters of the hydraulic support comprehensively. The mechanical model was established based on the analysis of the characteristic features of the static load so as to confirm and determine the accuracy to be needed in accordance with the field measurements. What is more,we have also managed to make up for the drawbacks of the empirical method by establishing a mathematical model of the mining height and dynamic load coefficient. Furthermore,we have also analyzed the applicability of the 8-fold rock mass density method to the high mining working face in the shallow coal seam from the point of view of the mining height and mining depth via the engineering analogy. In addition,we have analyzed and calculated the supporting strength by taking the YY-YY structure as an equivalent support in hoping to improve the scientific and technical accuracy of the results through the secondary development of the software known as FLAC2 D. The results of our simulation and investigation show that the thickness of the roof should be at 20 m,the first and periodic weighting lengths should be at about 56 m and 21 m,whereas the height of caving zone should be at about 60 m and the height of the fractured zone should be around 120 m with a developed surface. For the key parameters of the hydraulic support in a supporting strength,it is necessary to determine the support to 1. 67-1. 87 MPa via an engineering analogy,a support to 1. 79 MPa confirmed by the theoretical analysis and 1. 82 MPa through a numerical simulation. Thus,we have worked out the supporting strength at about 1. 8 MPa comprehensively. According to the roof convergence under different supporting strengths via numerical simulations,the results show that the supporting strength of 1. 8 MPa should be rational and reasonable. At the same time,the working resistance should be 26 000 k N with a hydraulic support being as high as about 4. 0-8. 8 m. Thus,it can be concluded that our research results can be taken as a reasonable basis for designing the hydraulic support.