A Study of the Statistical Damage Constitutive Model for the Brittle-Ductile Transition of Rock with Consideration of Damage Threshold
详细信息
- 责任者：Zhang Chao (Geotechnical Engineering Institute ; Hunan University ; Changsha 410082 ; China) ; Cao Wengui
- 刊名：Hydrogeology and Engineering Geology
- 出版年：2013
- 卷期：40(5)
- 关键词：损伤力学 ; damage mechanics ; 本构方程 ; constitutive equation
- 页码：p.45-50,57
- 图表：4 illus., 13 refs.
- 分类号：1702
- issnNo：ISSN1000-3665
- isbnNo：CN11-2202/P
摘要
Common rocks exhibit the characteristics of brittle-ductile transition under triaxial compression with increasing confining pressure.The compression deformation mechanism and characteristics of rock and the deficiency of Lemaitre’s strain equivalent theory are discussed,and a damage model according to actual conditions is established by adopting energy theory.Beginning with the objective fact that the rock will not damage when it bears little,the method for measuring microcosmic element strength of rock and the statistical damage evolvement model are established with consideration of the damage threshold.A statistical damage constitutive model is also established based on the above models.It reflects the property of brittle-ductile transition of rock under triaxial compression.The method to determine the model parameters is proposed.The comparison between experimental results and theoretical analyses shows that the model is reasonable and feasible.
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