深井回采巷道底鼓变形与支承压力关系分析

为了研究深井回采巷道底鼓变形与支承压力之间的关系,以铜川玉华煤矿2407工作面回风巷道为研究对象,采用理论分析、数值模拟和现场观测相结合的方法进行分析研究。通过建立巷道底板等效载荷力学分析模型,推导出在支承压力作用下巷道底板最大底鼓量的表达式。通过FLAC^3D模拟软件模拟计算得到不同煤柱宽度条件下巷道煤柱侧及煤壁侧的垂直应力分布,从有效避开采动影响的角度考虑,当煤柱宽度为25 m时,支承压力对巷道底鼓变形影响最小。现场观测结果表明:在采动影响下巷道两侧帮部塑性区呈不对称分布,煤柱侧帮部塑性区范围比煤壁侧帮部塑性区范围大。研究成果可为相似地质环境下巷道底鼓的分析提供参考。

Analysis of the relationship between floor heave deformation and abutment pressure in mining roadway of deep well

In order to study the relationship between floor heave deformation and abutment pressure in mining roadway of deep well,the return airway in 2407 working face of Tongchuan Yuhua Coal Mine was taken as the research background,and the method combining theoretical analysis,numerical simulation and field observation was used for analysis and research.By establishing the equivalent load mechanical analysis model of roadway floor,the expression of the maximum floor heave of roadway floor under the action of abutment pressure was derived.By FLAC^3D numerical simulation,vertical stress distribution on coal pillar side and coal wall side of roadway with different coal pillar widths was obtained.From the perspective of effectively avoiding the influence of mining,when the coal pillar width was 25 m,the influence of abutment pressure had the least influence on the floor heave deformation of roadway.The field observation results show that the plastic zone on both sides of the roadway is asymmetrically distributed under the influence of mining,and the plastic zone on the coal pillar side is larger than that on the coal wall side.The research results can provide reference for the analysis of floor heave in similar geological environment.