钢管混凝土支架强度与巷道承压环强化支护理论研究
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摘要
本文结合局部补强和工程条件设计了井下灌注式钢管混凝土支架注浆孔的三项补强措施及其参数,通过短柱轴压试验和数值模拟分析补强措施的补强作用机理并优化部分补强参数,以弥补短柱注浆孔侧的强度损失。采用极限平衡理论和短柱轴压试验分析钢管混凝土短柱的承载能力,并通过整体支架承压试验和数值模拟对钢管混凝土支架的力学特性以及巷道支护中支架与巷道围岩的关系进行分析。通过弹塑性力学确立巷道承压环强化支护理论的力学模型,确定三种支护方式的权重系数,并通过理论分析和数值模拟进一步分析三种支护方式对圆形深井软岩巷道承压环的强化支护作用。根据查干淖尔矿主斜井泥岩段膨胀性软岩的围岩地质条件,结合巷道承压环强化支护理论和现场经验,设计浅底拱圆形和椭圆形钢管混凝土支架支护方案,通过数值模拟和现场监测表明钢管混凝土支架支护方案满足煤矿巷道支护要求,验证了钢管混凝土支架的优越性和巷道承压环强化支护理论的适用性。
The reinforcement measures and their parameters of the pouring hole of field-pouring Steel Tube Confined Concrete (STCC) are designed by local reinforcement and project conditions, the reinforcing mechanism are analyzed by the uniaxial compression test and numerical simulation, and part parameters are optimized to make up for strength loss for the pouring holes of short columns. The ultimate bearing capacity of STCC short columns is analyzed by limit equilibrium theory and the uniaxial compression experiments. Combined with the test on the compressive resistance of STCC support and numerical simulation, the mechanical properties of STCC support and mechanical relationship between STCC support and surrounding rock are analyzed in roadway support. The theory mechanical model of roadway compression ring enhanced support is analyzed and established by elastoplastic mechanical, in which the weight coefficient of three kinds of supporting ways are determined. The enhanced supporting roles of three kinds of supporting ways on the compression ring of cicular deep soft rock roadway are further analyzed through theoretical analysis and numerical simulation. According to the expansive soft rock surrounding rock geological conditions of main inclined shaft mudstone rock zone of the the Chagannaoer Mine, STCC support supporting programs of shallow bottom arch circular and oval are designed combined with the roadway compression ring enhanced support theory and on-site experience. The supporting programs is shown to meet the requirements of the coal mine roadway support through numerical simulation and field monitoring, which verifies the superiority of STCC support and the applicability of the compression ring enhanced support theory.
The reinforcement measures and their parameters of the pouring hole of field-pouring Steel Tube Confined Concrete (STCC) are designed by local reinforcement and project conditions, the reinforcing mechanism are analyzed by the uniaxial compression test and numerical simulation, and part parameters are optimized to make up for strength loss for the pouring holes of short columns. The ultimate bearing capacity of STCC short columns is analyzed by limit equilibrium theory and the uniaxial compression experiments. Combined with the test on the compressive resistance of STCC support and numerical simulation, the mechanical properties of STCC support and mechanical relationship between STCC support and surrounding rock are analyzed in roadway support. The theory mechanical model of roadway compression ring enhanced support is analyzed and established by elastoplastic mechanical, in which the weight coefficient of three kinds of supporting ways are determined. The enhanced supporting roles of three kinds of supporting ways on the compression ring of cicular deep soft rock roadway are further analyzed through theoretical analysis and numerical simulation. According to the expansive soft rock surrounding rock geological conditions of main inclined shaft mudstone rock zone of the the Chagannaoer Mine, STCC support supporting programs of shallow bottom arch circular and oval are designed combined with the roadway compression ring enhanced support theory and on-site experience. The supporting programs is shown to meet the requirements of the coal mine roadway support through numerical simulation and field monitoring, which verifies the superiority of STCC support and the applicability of the compression ring enhanced support theory.
引文
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