摘要
为了研究上煤层采空区对其下伏近距离特厚煤层的影响,确定下煤层巷道布置内错距离;以国投塔山煤矿为背景,基于有限差分数值方法,运用双屈服本构模型实时修正手段,模拟了上煤层采空区垮落带岩体压实特性,阐明了采空区下伏煤岩层内应力场传递规律及塑性破坏发育范围;结合理论分析及现场钻孔窥视结果,验证了数值结果的可靠性,确定了下煤层回采巷道布置内错距离。结果表明:上煤层采空区内遗留区段煤柱下方应力场在下煤层中形成近似"正梯形"影响范围,上下影响宽度分别为32、56 m;遗留区段煤柱下方塑性区在下煤层中呈"倒梯形"分布,上下塑性区宽度分别为81.36、61.47 m;结合理论分析及现场钻孔窥视结果,最终确定下煤层回采巷道内错距离应为13.5 m。
This paper aims to study the influence of the goaf in the upper coal seam on the overlying ultra-thick coal seam and determine the dislocation distance in the roadway layout of the lower coal seam. Based on finite difference method, this research,takig Tashan Coal Mine as the engineering background, established Mohr-Coulomb and double yield constitutive models to invert the rock strata and the rock mass in the caving zone. The failure law of the ultra-thick coal seam under the influence of the overlying close goaf was studied on the basis of goaf and the residual coal pillar. In addition, the distribution law of stress field and the failure range in the coal seam under the goaf were clarified. With the theoretical analysis and the field borehole peep results, the reliability of the numerical method in this paper was verified, and the inner interlocked distance in the roadway layout of the lower coal seam was determined. The results show that the residual coal pillar has the greatest influence on the mining of the lower coal seam. The stress field under the residual coal pillar forms an approximate“normal trapezoid”influence range in the lower coal seam, with the width of the upper and lower being 32 m and 56 m respectively. The plastic zone under the residual coal pillar is distributed in an “inverted trapezoid”in the lower coal seam, and the width of the upper and lower is 81.36 m and61.47 m, respectively. The inner interlocked distance of the roadways of the lower seam should be 13.5 m.
作者
薛吉胜
赵铁林
潘黎明
XUE Jisheng;ZHAO Tielin;PAN Liming(Coal Mining and Designing Department,Tiandi Science and Technology Co.,Ltd.,Beijing 100013,China;China Coal Technology and Engineering Group Coal Mining Research Institute,Beijing 100013,China)
出处
《煤矿安全》
CAS
北大核心
2022年第2期202-209,共8页
Safety in Coal Mines
基金
国家重点研发计划资助项目(2018YFC0604501)
天地科技股份有限公司科技创新创业资金资助项目(2019-TD-QN006)。
关键词
近距离采空区
双屈服模型
遗留煤柱
下伏煤层
破坏特性
close goaf
double yield model
residual coal pillar
underlying coal seam
failure characteristics
