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《Chinese Journal of Underground Space and Engineering》 2014-05
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Investigation on Constitutive Model of Rock Failure under Mining Unloading and Its Experimental Validation

Zuo Jianping;Liu Lianfeng;Chen Shaojie;Chen Lianjun;School of Mechanics & Civil Engineering,China University of Mining & Technology;State Key Laboratory of Mining Disaster Prevention and Control(Shandong University of Science and Technology);  
Based on the rock mass failure experiment under mining unloading,a three-stage model is developed to approximately depict the rock stress-strain relationship model of unloading mining. From the classical strain gradient plasticity,we established a localized strain elastoplastic element model. And the relationship between the strain local deformation zone and the intrinsic material size has been derived. A simple linear relationship is used to depict the relationship between macroscopic local deformation and materials internal parameters- intrinsic material dimensions. The stress-strain curves for mining unloading depict the constitutive relations in three stages,namely elastic stage,elastic-plastic stage and damage softening stage. The effects of porosity,scale factor and intrinsic dimension of material on plastic yield surface have been discussed in detail. When the rocks are in a highly compacted state,the porosity is essentially changed. Subcritical microcracks are mainly produced in the local deformation zone. By selecting the appropriate intrinsic dimensions and other parameters for the developed constitutive model,the theoretical curves well agree with the experimental results.
【Fund】: 国家重点基础研究发展计划(973)项目(2010CB732002);; 国家自然基金项目(51374215、11102225);; 山东省矿山灾害预防控制国家重点实验室培育基地(山东科技大学)开放基金(MDPC2012KF03);; 霍英东教育基金会第十四届高等院校青年教师基金应用课题(142018)
【CateGory Index】: TU45
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