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
A numerical model of uniaxial compression is built by FLAC3D and its validity is proved by comparing with actual test result. The elasticity modulus of element is changed while other material parameters are controlled. To research the effect of element’s elasticity modulus on rock’s uniaxial compressive strength, the elasticity modulus changes in a certain range uniformly, randomly and according to normal distribution respectively. Results show that the better elasticity modulus uniformity is, the greater rock compressive strength will be. The maximum value is equal to the result when elasticity modulus of the whole model is a same reference value. When elasticity modulus of elements changes randomly in a certain range, compressive strength becomes smaller. The greater randomness of elasticity modulus is, the smaller compressive strength will be. In the same range, rock compressive strength when elasticity modulus changes according to normal distribution is greater than that when elasticity modulus changes randomly. Both of them are smaller than the rock compressive strength when elasticity modulus value of the whole model is a same reference value. The relation can be expressed by σ1≥σEnormal distribution≥σErandom distribution≥σEuniform distribution.
关键词
单轴压缩试验 /
弹性模量 /
FLAC3D
Key words
uniaxial compression test /
elasticity modulus /
FLAC3D
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参考文献
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