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如何考虑煤的力学参数之间的关联性是非均质煤储层模拟的关键。通过试验获得了阜新五龙矿某工作面102组煤样的弹性模量、单轴抗压和抗拉强度,定义了弹性模量无量纲因数、单轴抗压强度无量纲因数和抗拉强度无量纲因数及拉弹因数比、压弹因数比5个物理参数,并对试验数据进行统计分析,结果表明,(1)煤的弹性模量、单轴抗压强度和抗拉强度均具有统计分布特征,可以用Weibull分布描述;(2)弹性模量因数、单轴抗压强度因数和抗拉强度因数三者之间存在关联性;(3)拉弹因数比和压弹因数比都符合Weibull分布。以弹性模量为基准,建立了考虑参数关联的非均质煤随机概率模型,开发了相应的虚拟煤体生成程序。研究了2个数值算例,算例1分别按考虑力学参数关联和不考虑力学参数关联两种方法生成煤的力学参数,并与试验数据进行对比,结果表明,前者获得的结果与试验数据更接近;算例2对比了2种方法赋值的平面应变煤样单轴压缩下的宏观应力-应变曲线和煤样破坏过程,结果表明,考虑力学参数关联比不考虑力学参数关联得到的模拟结果更合理,利用文中模型能更好地模拟煤的非均质力学特性。
How to consider the correlation between the mechanical parameters of coal is the key to the heterogeneous coal reservoir simulation. Through the experiment, the elastic modulus, uniaxial compressive strength and tensile strength of 102 coal samples in a working face of Wuxing mine in Fuxin were obtained. The dimensionless modulus of elastic modulus, dimensionless factor of uniaxial compressive strength and tensile strength Dimensionless factor and draft factor ratio, compression factor ratio of five physical parameters, and the statistical analysis of test data, the results show that (1) coal elastic modulus, uniaxial compressive strength and tensile strength are statistically (2) there is a correlation between elastic modulus factor, uniaxial compressive strength factor and tensile strength factor; (3) both the ratio of draw-bomb and the ratio of draw-off factor Meets the Weibull distribution. Based on the elastic modulus, a stochastic probabilistic model of heterogeneous coal with parameter correlation was established and a corresponding virtual coal generative program was developed. Two numerical examples are studied. In the first case, the mechanical parameters of coal are generated by considering the correlation of mechanical parameters and that of the mechanical parameters without considering the mechanical parameters respectively. The results show that the former results are more in agreement with the experimental data The results are compared with the simulation results obtained by considering the relationship between the mechanical parameters and the mechanical parameters without considering the macroscopic stress-strain curve and the coal sample destruction process under the uniaxial compression of two kinds of methods. Reasonable, using the text model can better simulate the heterogeneous mechanical properties of coal.