动态巴西圆盘劈裂试验的极限分析解

发布时间：2018-03-28 18:32

本文选题：动态拉伸强度　切入点：巴西圆盘试验　出处：《岩土工程学报》2017年06期

【摘要】：通过极限分析上限定理对巴西圆盘动态劈裂试验的弹性解进行了优化,考虑高速冲击作用导致的岩石试件端部剪切裂纹对动态拉伸强度的影响,获得了计算动态拉伸强度上限解的新公式。通过对实测的砂岩动态劈裂试验结果的分析,对比了原始的弹性解和得到的上限解间的差别,研究表明砂岩的动态拉伸性能随加载率的变化不明显,随着加载率的提高,动态拉伸强度曲线较平缓,说明砂岩在动态作用下承受拉应力的能力较低,抗拉强度的变化范围较小。同时验证了基于极限分析法的岩石动态抗拉强度公式可以为砂岩的工程应用提供更安全可靠的参考值。
[Abstract]:The elastic solution of dynamic splitting test of Brazilian disk is optimized by the upper limit theorem of limit analysis. The effect of shear crack at the end of rock specimen caused by high velocity impact on dynamic tensile strength is considered. A new formula for calculating the upper bound solution of dynamic tensile strength is obtained. The difference between the original elastic solution and the obtained upper bound solution is compared by analyzing the measured results of dynamic splitting test of sandstone. The study shows that the dynamic tensile properties of sandstone have no obvious change with the loading rate, and the dynamic tensile strength curve is relatively flat with the increase of the loading rate, which indicates that the ability of sandstone to bear the tensile stress under the dynamic action is lower. It is verified that the dynamic tensile strength formula based on the limit analysis method can provide a more safe and reliable reference value for the engineering application of sandstone.
【作者单位】：中国矿业大学(北京)力学与建筑工程学院;中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室;
【基金】：国家自然科学基金青年基金项目(51404273)
【分类号】：TU458

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