含初始损伤的煤统计损伤本构模型研究  

Study of initial damage considered statistic mesoscopic damage constitutive model of coal

作　　者：孙传猛[1,2] 曹树刚[1] 李勇[1] 李国栋[1] 杨红运[1] 

机构地区：[1]重庆大学资源及环境科学学院,重庆400044 [2]中北大学电子测试技术国家重点实验室计算机与控制工程学院,山西太原030051

出　　处：《中国矿业大学学报》2016年第2期244-253,共10页Journal of China University of Mining & Technology

基　　金：国家自然科学基金重点项目(U1361205);国家自然科学基金项目(51474039);国家自科基金青年基金项目(51404046);煤矿灾害动力学与控制国家重点实验室自主课题(2011DA105287-ZD201302)

摘　　要：基于数字图像处理技术和Monte-Carlo理论重构了煤体细观结构单元,假定煤微元强度服从对数正态分布建立煤统计损伤本构模型,并计算得初始损伤值.结果表明:1)基于门限处理和形态学相结合确定种子点位置的区域生长法,可有效提取煤SEM图像的细观结构信息;2)煤细观结构几何参数分别服从特定的统计分布,通过Monte-Carlo法模拟的细观表征体元可较好地描述煤初始损伤情况;3)构建的模型能较好地模拟煤变形破坏全过程,尤其是初始压密阶段.Meso-structure elements of coal were rebuilt based on digital image processing technology and Monte-Carlo method.Statistic meso-damage constitutive model of coal was constructed by supposing that the strength of elements followed the lognormal distribution.The initial damage variable was observed using MATLAB.The results show that：1）Meso-structure information of coal can be extracted effectively from SEM images by using the regional growing method,in which the location of seed points is determined based on the combination of thresholding and morphological;2）The geometric parameters of meso-structure are subject to particular statistical distribution rule.The initial damage of coal can be described preferably by representative element volume that simulated by Monte-Carlo method;3）The meso-damage constitutive model proposed in this paper has highly precision in simulating the deformation and damage of coal,especially for the initial compaction stage.

关 键 词：区域生长 细观结构 岩石力学 损伤本构模型 MONTE-CARLO法 

分 类 号：TU452[建筑科学—岩土工程]