为解决皮里青煤矿斜井风化基岩段两帮移近量大、顶板冒落、支护成本高等问题,基于岩层段划分、现场锚固力试验,提出了利用工字钢支架和锚网索喷2种支护方式对风化基岩段进行分段支护的优化方案,并进行了FLAC^(3D)模拟分析和现场工业性...为解决皮里青煤矿斜井风化基岩段两帮移近量大、顶板冒落、支护成本高等问题,基于岩层段划分、现场锚固力试验,提出了利用工字钢支架和锚网索喷2种支护方式对风化基岩段进行分段支护的优化方案,并进行了FLAC^(3D)模拟分析和现场工业性试验。结果表明:弱风化基岩段锚网索喷支护能够满足98、196 k N的锚固力设计要求,且围岩控制效果优于工字钢支架,围岩塑性区范围和变形量分别减少了25%和40%,因而风化基岩段进行分段支护能够达到更优的支护效果。展开更多
The installation of a back-wall guard-board is the key to successfully supporting underground retreating roadways in coal mines. Based on the coordinate support principle, and using an I-shaped steel support for the s...The installation of a back-wall guard-board is the key to successfully supporting underground retreating roadways in coal mines. Based on the coordinate support principle, and using an I-shaped steel support for the surrounding rock, a mechanical model was developed for the stability of the roadway support and surrounding rock. Analysis of the bearing capacity of the roof back-wall guard-board and modelling of the equations for the maximum deflection and the maximum compressive stress of the top and side beams of the I-shaped steel support were undertaken. Simultaneously, the model was used to calculate and analyse the stability of the top and side beams of the I-shaped steel support structure and analyse the criteria for their stability. The results provide a reliable theoretical basis for the judgment of the stability of the surrounding rock and support structure. The theoretical evaluation results are consistent with field data. Finally, the key support parameters of the top and side beams of the I-shaped steel support structure and the variation of the maximum deflection and the maximum compressive stress as affected by the influence of the guard-board length were investigated. It is concluded that, as the back-board length increases, the maximum compressive stress in the top beam of the I-shaped steel support increases while the compressive stress in the side beam decreases. The results show that the accuracy of judgment of the stability of a supported retreating roadway is improved, providing guidance for the design of such typical I-shaped steel support and back-board structures.展开更多
文摘为解决皮里青煤矿斜井风化基岩段两帮移近量大、顶板冒落、支护成本高等问题,基于岩层段划分、现场锚固力试验,提出了利用工字钢支架和锚网索喷2种支护方式对风化基岩段进行分段支护的优化方案,并进行了FLAC^(3D)模拟分析和现场工业性试验。结果表明:弱风化基岩段锚网索喷支护能够满足98、196 k N的锚固力设计要求,且围岩控制效果优于工字钢支架,围岩塑性区范围和变形量分别减少了25%和40%,因而风化基岩段进行分段支护能够达到更优的支护效果。
基金Project(2014QNA50) supported by Fundamental Research Funds for the Central Universities,ChinaProject(51404248) supported by the National Natural Science Foundation of ChinaProject supported by the Priority Academic Program Development(PAPD) of Jiangsu Higher Education Institutions,China
文摘The installation of a back-wall guard-board is the key to successfully supporting underground retreating roadways in coal mines. Based on the coordinate support principle, and using an I-shaped steel support for the surrounding rock, a mechanical model was developed for the stability of the roadway support and surrounding rock. Analysis of the bearing capacity of the roof back-wall guard-board and modelling of the equations for the maximum deflection and the maximum compressive stress of the top and side beams of the I-shaped steel support were undertaken. Simultaneously, the model was used to calculate and analyse the stability of the top and side beams of the I-shaped steel support structure and analyse the criteria for their stability. The results provide a reliable theoretical basis for the judgment of the stability of the surrounding rock and support structure. The theoretical evaluation results are consistent with field data. Finally, the key support parameters of the top and side beams of the I-shaped steel support structure and the variation of the maximum deflection and the maximum compressive stress as affected by the influence of the guard-board length were investigated. It is concluded that, as the back-board length increases, the maximum compressive stress in the top beam of the I-shaped steel support increases while the compressive stress in the side beam decreases. The results show that the accuracy of judgment of the stability of a supported retreating roadway is improved, providing guidance for the design of such typical I-shaped steel support and back-board structures.
