单元体弹性模量分布对岩石单轴抗压强度影响数值模拟

发布时间：2018-03-09 17:11

  本文选题：单轴压缩试验　切入点：弹性模量　出处：《长江科学院院报》2014年09期 　论文类型：期刊论文

【摘要】：利用FLAC3D建立单轴压缩试验数值模型并与实际情况比较以验证模型可靠性。控制其它材料参数,改变单元体弹性模量分析岩体抗压强度的影响。岩体模型各单元体弹性模量在一定区间内分别按均匀变化规律取值、随机取值以及按正态分布规律取值,研究单元体弹性模量分布规律对岩石单轴抗压强度的影响。结果表明:弹性模量分布的均匀性越好,岩石抗压强度越大,最大值等于整个岩体模型弹性模量取相同参考值时的计算结果;单元体弹性模量在一定区间内随机取值时,岩石抗压强度将减小,且弹性模量随机取值区间越大,岩石抗压强度越小;在相同的取值区间上,弹性模量按正态分布规律取值时岩石抗压强度大于弹性模量随机取值时的抗压强度。两者都小于整个岩体模型弹性模量取相同参考值时岩石的抗压强度,即σ1≥σE正态分布≥σE随机分布。
[Abstract]:The numerical model of uniaxial compression test is established by using FLAC3D and compared with the actual situation to verify the reliability of the model, and other material parameters are controlled. Changing the elastic modulus of the unit body to analyze the influence of the rock mass compressive strength. The elastic modulus of each unit body of the rock mass model is chosen according to the uniform variation law, random value and normal distribution law in a certain range, respectively. The effect of elastic modulus distribution on uniaxial compressive strength of rock is studied. The results show that the better the uniformity of elastic modulus distribution, the greater the compressive strength of rock. When the elastic modulus of the whole rock mass model is equal to the same reference value, the compressive strength of the rock decreases when the elastic modulus of the element body is chosen randomly in a certain range, and the larger the random value interval of the elastic modulus is, The smaller the compressive strength of the rock; in the same value range, The compressive strength of rock is larger than that of random value of elastic modulus when the elastic modulus is chosen according to the normal distribution law. Both are smaller than the compressive strength of rock when the elastic modulus of the whole rock mass model takes the same reference value. That is, 蟽 1 鈮，

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