The paper aims to identify a reasonable method for mining ultra-thick coal seams in an end-slope in surface mine, With a case study of Heidaigou surface coal mine(HSCM), the paper conducted a comparative research on t...The paper aims to identify a reasonable method for mining ultra-thick coal seams in an end-slope in surface mine, With a case study of Heidaigou surface coal mine(HSCM), the paper conducted a comparative research on three mining methods, namely Underground Mining Method(UMM), Highwall Mining System(HMS) and Local Steep Slope Mining Method(LSSMM). A model was firstly established to simulate the impact that UMM and HMS exert on monitoring points and surface deformation. The way that stripping and excavation amount varies with different slope angle, and the corresponding end slope stability were analyzed in the mode of LSSMM. Then a TOPSIS model was established by taking into account six indicators such as recovery ratio, technical complexity and adaptability, the impact on surface mining production, production safety and economic benefits. Finally, LSSMM was determined as the best mining method for mining ultra-thick coal seams in end slope in HSCM.展开更多
We determined a suitable gate road layout in slice mining in an ultra-thick unstable coal seam,using theoretical analysis and numerical calculations.Based on plasticity theory in terms of limiting equilibrium,the widt...We determined a suitable gate road layout in slice mining in an ultra-thick unstable coal seam,using theoretical analysis and numerical calculations.Based on plasticity theory in terms of limiting equilibrium,the width of chain pillar in the upper slice was calculated to be 18 m.The stress distribution in the chain pillar after the upper slice was mined out was described with numerical simulation.The extent of the effect of stress on the upper chain pillar on the lower solid coal was obtained on the basis of an elastic solution of a distributed force loaded on a half-plane.Three layout designs for lower gate roads were proposed and a stability factor was introduced to analyze the stability of the lower pillar with numerical calculation.Gate road translation was determined as the most suitable layout method,which maximizes the extraction rate on the basis of the pillar stability.展开更多
针对特厚煤层小煤柱稳定性差的问题,以一煤矿为例,介绍一种特厚煤层小煤柱稳定性及合理护巷宽度分析方法。首先,将煤矿作业面各岩层密度、抗拉强度等参数录入到FLAC(Fast Lagrangian Analysis of Continua)软件内,由该软件自动构建出煤...针对特厚煤层小煤柱稳定性差的问题,以一煤矿为例,介绍一种特厚煤层小煤柱稳定性及合理护巷宽度分析方法。首先,将煤矿作业面各岩层密度、抗拉强度等参数录入到FLAC(Fast Lagrangian Analysis of Continua)软件内,由该软件自动构建出煤层三维立体模型,之后以此为基础,根据作业面开采情况分别向模型施加一定应力,由软件自动对模型掘进巷道、回采阶段及小煤柱巷道围岩力学特性进行分析,以寻找出整个巷道内的薄弱点,最后根据力学特征分析结果,设计出最佳的小煤柱巷道支护方案,提升整个特厚煤层的稳定性,防止煤矿开采过程中出现巷道坍塌等问题,具有一定的应用价值。展开更多
基金provided by the National Natural Science Foundation of China(No.90510002)the Science and Technology Research of the Ministry of Education of China(No.306008)
文摘The paper aims to identify a reasonable method for mining ultra-thick coal seams in an end-slope in surface mine, With a case study of Heidaigou surface coal mine(HSCM), the paper conducted a comparative research on three mining methods, namely Underground Mining Method(UMM), Highwall Mining System(HMS) and Local Steep Slope Mining Method(LSSMM). A model was firstly established to simulate the impact that UMM and HMS exert on monitoring points and surface deformation. The way that stripping and excavation amount varies with different slope angle, and the corresponding end slope stability were analyzed in the mode of LSSMM. Then a TOPSIS model was established by taking into account six indicators such as recovery ratio, technical complexity and adaptability, the impact on surface mining production, production safety and economic benefits. Finally, LSSMM was determined as the best mining method for mining ultra-thick coal seams in end slope in HSCM.
基金provided by the Research Fund of the Fundamental Research Funds for the Central Universities of China University of Mining & Technology (No. 2010ZDP02B02)the State Key Laboratory of Coal Resources and Mine Safety (No.SKLCRSM08X2)+2 种基金the Jiangsu "333"High Qualified Talentsthe National Natural Science Foundation of China (Nos. 50904063 and51004101)the Scientific Research Foundation of China University of Mining & Technology (Nos. 2008A003 and 2009A001)
文摘We determined a suitable gate road layout in slice mining in an ultra-thick unstable coal seam,using theoretical analysis and numerical calculations.Based on plasticity theory in terms of limiting equilibrium,the width of chain pillar in the upper slice was calculated to be 18 m.The stress distribution in the chain pillar after the upper slice was mined out was described with numerical simulation.The extent of the effect of stress on the upper chain pillar on the lower solid coal was obtained on the basis of an elastic solution of a distributed force loaded on a half-plane.Three layout designs for lower gate roads were proposed and a stability factor was introduced to analyze the stability of the lower pillar with numerical calculation.Gate road translation was determined as the most suitable layout method,which maximizes the extraction rate on the basis of the pillar stability.
文摘针对特厚煤层小煤柱稳定性差的问题,以一煤矿为例,介绍一种特厚煤层小煤柱稳定性及合理护巷宽度分析方法。首先,将煤矿作业面各岩层密度、抗拉强度等参数录入到FLAC(Fast Lagrangian Analysis of Continua)软件内,由该软件自动构建出煤层三维立体模型,之后以此为基础,根据作业面开采情况分别向模型施加一定应力,由软件自动对模型掘进巷道、回采阶段及小煤柱巷道围岩力学特性进行分析,以寻找出整个巷道内的薄弱点,最后根据力学特征分析结果,设计出最佳的小煤柱巷道支护方案,提升整个特厚煤层的稳定性,防止煤矿开采过程中出现巷道坍塌等问题,具有一定的应用价值。
