硬岩层爆及锚杆锚固机制试验研究

发布时间：2018-06-01 22:28

本文选题：岩石力学 + 硬岩　；参考：《岩石力学与工程学报》2017年10期

【摘要】：针对巷(隧)道岩爆破裂演化及锚杆锚固机制研究的不足,利用自制的真三轴加卸载试验系统开展具有岩爆倾向性的无锚固和树脂锚杆锚固长方体硬岩试样在单面约束情况下的双轴压缩对比试验研究,分析和探讨硬岩层爆、层级破裂演化及锚杆锚固机制。结果表明,在无锚固的情况下,硬岩呈现明显层爆现象,从临空面到深部,爆裂破断面的分形维数主要集中在1.3~1.8范围,随层序由于破断面摩擦作用的增强导致其分形维数随之降低,断裂形态随层序逐渐由张拉断裂为主导向剪切断裂为主导过渡,同时各层面均或多或少伴有次生层断裂;锚杆锚固明显降低了爆裂层数及范围,限制了硬岩逐层爆裂;理论分析得出临空面附近硬岩层爆层数的计算公式;视硬岩层爆部分为层状岩层,提出层爆控制的锚杆组合梁理论;临空面附近以劈裂为主的层爆是受压致拉的结果,通过锚杆锚固显著提高了完整岩体的抗拉强度,使层爆层数及范围大为降低甚至不发生层爆。
[Abstract]:In order to solve the problem of rock burst evolution and anchoring mechanism of roadway (tunnel) tunnel, The self-made true triaxial loading and unloading test system is used to study the uniaxial compression test of unanchored and resin anchoring cuboidal hard rock samples with rockburst tendency, and to analyze and discuss the hard rock layer explosion. Hierarchical fracture evolution and anchoring mechanism. The results show that in the absence of Anchorage, the hard rock shows obvious laminar explosion phenomenon, and the fractal dimension of burst fracture section is mainly in the range of 1.31.8from the face of the air to the deep. The fractal dimension of the sequence decreases as a result of the enhancement of the frictional action of fracture section, and the fracture morphology gradually changes from tensile fracture to shearing fault with sequence, and each layer is accompanied by secondary fault more or less. The bolt anchoring can obviously reduce the number and range of burst layer and limit the burst of hard rock layer by layer. The formula for calculating the number of burst layers of hard rock layer near the face of the air is obtained by theoretical analysis, and the explosive part of hard rock layer is regarded as layered rock layer, This paper puts forward the theory of composite beam controlled by laminar explosion, and the laminated blasting near the empty surface is the result of compressive tension, and the tensile strength of the whole rock mass is improved obviously by anchoring the bolt, and the tensile strength of the whole rock mass is greatly improved by the laminated blasting near the empty surface. The number and range of laminated explosive layer are greatly reduced, even no laminated explosion occurs.
【作者单位】：山东理工大学资源与环境工程学院;山东理工大学矿山工程技术研究所;
【基金】：山东省自然科学基金资助项目(ZR2015EL016) 山东理工大学青年教师发展支持计划经费资助;山东理工大学一级学科重点支持计划~~
【分类号】：TU45

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