基于Weibull分布的AMD蚀化岩石统计本构模型研究
首发时间:2010-01-07
摘要:岩石是一种非均质的地质材料,其所包含的微裂隙和孔隙等缺陷的分布具有较大的随机性,受酸腐蚀岩石的各种力学参数也表现出较大的离散性。基于岩石微元强度服从Weibull随机分布的特点,引进能合理描述岩石微元强度的参量,建立了反映岩石破裂全过程的损伤统计本构模型;引进岩石应力应变全过程的特征参量,确定了Weibull分布函数的参数方程,提出用Weibull分布参数来反映受酸腐蚀岩石的非均匀性方法,与试验结果及前人研究成果的比较显示该方法具有一定的合理性。
关键词: 岩石 Weibull分布函数 本构模型 非均匀性系数
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Study on Statistical Constitutive Model of Rocks Eroded by AMD Based on Weibull Distributing
Abstract:Rock is a non-homogeneous geological materials, the distribution of defects such as micro cracks and porosity have the large randomness and some mechanical parameters of the corroded rock also show a greater dispersion. Based on the strength characteristics of rock micro-unit with Weibull distribution, a rock damage constitutive model is established to reflect the full process of rock failure by using the parameter of rational description of micro-unit strength of rock; Parametric equation of Weibull distribution function is established by introducing the characteristic parameters of the rocks stress-strain entire process curve and the method to describe rock heterogeneity of the corroded rock is proposed by in terms of the parameter of Weibull distribution function. The presented method has certain rationality with comparison to the experimental results and former study results.
Keywords: rock Weibull distribution function constitutive equation heterogeneity coefficient
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No.3862051116012628****
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