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首页> 外文会议>Boundaries of Rock Mechanics: Recent Advances and Challenges for the 21st Century >Mechanical behaviour of biaxially loaded coalmine sandstone
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Mechanical behaviour of biaxially loaded coalmine sandstone

机译：双轴加载煤矿砂岩的力学行为

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As mines continue to reach deeper deposits, mining-induced stresses at mine opening boundaries can be significant enough to cause concern about strainburst occurrence and personnel safety. The state of stress at the boundary of mine openings is that of plane stress. In order to investigate the biaxial strength of geomaterials,a series of tests on 75 mm cube gray sandstone samples, obtained from an underground coal mining operation in China, has been carried out for the purpose of determining the biaxial strength characteristics of the sandstone rock. Tests were preformed under biaxial loading conditions and the samples were subjected to a loading rate of 1 MPa/s. Uniaxial tests were also performed on cubic and traditional cylindrical samples and the results were compared. Two loading paths were adopted--the first with equal loading in both directions until failure, and the second with equal loading in both directions until 50% of the uniaxial compressive strength was attained,followed by loading in one direction to failure while holding the other constant. Test results and observed phenomena are reported, and failure mechanisms due to biaxial loading are discussed. It was observed that the biaxial strength is significantly increased with lateral confinement. The failure mechanism is generally initiated by rock spalling at the free faces of the rock sample at an early stage of loading and progresses with further loading. Ultimate failure occurs in the form of an out-of-plane shear failure mechanism and is of a violent nature.
机译：随着矿山继续到达更深的矿床，矿山开采边界处的采矿引起的应力可能会足够大，以引起对爆炸事故发生和人员安全的担忧。矿井边界处的应力状态是平面应力状态。为了研究土工材料的双轴强度，已对中国地下煤矿开采的75毫米立方灰色砂岩样品进行了一系列测试，目的是确定砂岩岩石的双轴强度特性。在双轴加载条件下进行测试，并对样品施加1 MPa / s的加载速率。还对立方和传统圆柱样品进行了单轴测试，并对结果进行了比较。采用了两个加载路径-第一个在两个方向上均承受相等的载荷直到破坏，第二个在两个方向上均承受相等的载荷直到达到单轴抗压强度的50％，其次是在一个方向上施加载荷直到破坏而又保持另一个不变。报告了测试结果和观察到的现象，并讨论了由于双轴载荷引起的破坏机理。观察到，随着横向约束，双轴强度显着增加。破坏机制通常是在加载的早期阶段在岩石样品的自由面上剥落岩石而引发的，并随着进一步的加载而发展。最终破坏以面外剪切破坏机制的形式发生，具有暴力性质。

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