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首页> 外文会议>2007采矿科学与安全技术国际学术会议 >Analysis on the Deformation and Strength Characteristics of Siltstone under Different Stress States
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Analysis on the Deformation and Strength Characteristics of Siltstone under Different Stress States

机译：不同应力状态下粉砂岩的变形和强度特性分析

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With servo-testing machine, the experimental tests for siltstone of coal seam roof were carried out under Brazilian splitting tests, uniaxial compression tests, triaxial compression tests and triaxial tests with confining pressure reduction. Deformation and strength characteristics of siltstone under different stress states were analyzed. The experimental results demonstrate that, the characteristic of mineral grain of siltstone is more obvious. The deformation characteristic of siltstone samples while they are loaded and unloaded is more different from each other and the character has relationship with loading history. Average elastic modulus of siltstone samples while they were firstly unloaded or secondly loaded may illustrates the relationship between their stress and strain. The modulus that is affected a little by rock samples and experimental conditions has more obvious mechanical meaning. The ratio of tensile strength to compressive strength for siltstone samples is 1:18.9 which belongs to typical brittle rock, but it has a definite plasticity under higher confining pressure. Yield point elongation appears in the peak value position of stress-strain curve for siltstone samples. It is regressive strength parameters of siltstone rock samples in respective triaxial compression tests and triaxial tests with confining pressure reduction that are approximately identical with their regressive strength parameters in above two type tests united. Therefore, the angles of internal friction and cohesion of rock, which indicate material mechanical properties and have no relationship with loaded way of rock samples, are mechanical parameters of rock material.
机译：通过伺服试验机，在巴西分裂试验，单轴压缩试验，三轴压缩试验和具有限制压力减少的三轴试验下进行煤层屋顶砂岩的实验试验。分析了不同应力状态下硅铁晶的变形和强度特性。实验结果表明，硅粒矿石的特征更为明显。粉丝样本的变形特性在加载和卸载时彼此更加不同，并且该角色具有与装载历史的关系。硅铁晶样品的平均弹性模量在首次卸载或二次装载时可以说明其应力和应变之间的关系。受到岩石样品和实验条件影响的模量具有更明显的机械意义。硅铁石样品的拉伸强度与抗压强度的比例为1：18.9，其属于典型的脆性岩石，但在较高的压力下具有明确的可塑性。屈服点伸长率出现在硅铁石样品应力 - 应变曲线的峰值位置。它是各自的三轴压缩试验中硅铁石岩石样品的回归强度参数，以及限制压力减少的三轴试验，其与上述两种型试验中的回归强度参数大致相同。因此，岩石内部摩擦和粘合的角度，表示材料机械性能，并且与岩石样品的负载方式没有关系，是岩石材料的机械参数。

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