软岩巷道变形机理分析与钢管混凝土支架支护技术研究
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摘要
本文详细分析了软岩巷道围岩变形机理,对巷道围岩的弹性恢复、流变、碎胀和吸水膨胀等变形量分别进行了定量分析计算；针对软岩巷道流变突出的特点,分别就岩石流变、吸水膨胀和流变扰动效应等因素引起的围岩应力场的演变规律进行了分析。软岩巷道流变性突出,巷道围岩稳定需要较大的支护反力,为此提出了钢管混凝土支架支护技术。首先总结分析了已有的钢管混凝土短柱承载力计算理论,在此基础上,采用弹性力学分析的方法,推导出了基于弹性变形理论的钢管混凝土短柱极限承载力计算公式。在实验室进行了圆形断面、套管连接方式的钢管混凝土支架实验,实验测试了钢管混凝土支架的载荷变形曲线、极限载荷、极限变形量和失稳破坏方式,实验结果表明,钢管混凝土支架的支护能力是单位长度重量相同的U型钢支架的2倍以上。最后,根据龙口海域软岩巷道围岩力学性质,设计了软岩巷道钢管混凝土支架支护方案。
The mechanism of deformation of soft rock roadway has been analysed in detail in this thesis, including the elastic restitution, rheology, bulking, water-swelling, etc.,. Also the factors affect the evolution law of surrounding rock stress field have been carefully analysed. The concrete-filled steel tubular stent supporting technology was proposed based on the requirement of strong retaining reaction to maintain the stability of roadway. Initially, after considering the extant theory calculation of bearing capacity of concrete-filled steel tubular short columns, the calculation equation of ultimate bearing capacity of it is deduced according to the elastic deformation theory. A series of lab experiments were conducted to measure load deformation curve, limit load, limit deformation and failure mode of destabilization. The results demonstrated that support capacity of concrete-filled steel tubular stent is two times as much as the U-form steel stent with equivalent length and weight. Thus, a support plan about is is designed based on the analysis of soft rock roadway characteristics in Longkou sea area.
The mechanism of deformation of soft rock roadway has been analysed in detail in this thesis, including the elastic restitution, rheology, bulking, water-swelling, etc.,. Also the factors affect the evolution law of surrounding rock stress field have been carefully analysed. The concrete-filled steel tubular stent supporting technology was proposed based on the requirement of strong retaining reaction to maintain the stability of roadway. Initially, after considering the extant theory calculation of bearing capacity of concrete-filled steel tubular short columns, the calculation equation of ultimate bearing capacity of it is deduced according to the elastic deformation theory. A series of lab experiments were conducted to measure load deformation curve, limit load, limit deformation and failure mode of destabilization. The results demonstrated that support capacity of concrete-filled steel tubular stent is two times as much as the U-form steel stent with equivalent length and weight. Thus, a support plan about is is designed based on the analysis of soft rock roadway characteristics in Longkou sea area.
引文
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