STUDY OF UNLOADING DILATANCY PROPERTY OF ROCK AND ITS CONSTITUTIVE MODEL UNDER HIGH CONFINING PRESSURE
(1. Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China;2. Key Laboratory of Geotechnical
and Underground Engineering of Ministry of Education,Tongji University,Shanghai 200092,China)
Abstract:Based on the unloading test of rock specimen under high confining pressure,the dilatancy property of rock mass is studied. The study results show that the deformation modulus at initial dilatancy point where the largest compression volumetric strain can be used as elastic modulus at elastic stage. Based on the unloading test,the complete stress-strain curve for rock is composed of four phase:elasticity,unloading yield,post-peak brittleness and residual ideal plastic phases. According to the characteristics of each stage,the constitutive model for that corresponding stage can be obtained. Finally,complete constitutive model for rock mass under unloading can be established. Through data fitting method,the model curves of different unloading tests are obtained,which has been verified to well fit the experimental curves.
黄 伟1,沈明荣1,2,张清照1. 高围压下岩石卸荷的扩容性质及其本构模型研究[J]. 岩石力学与工程学报, 2010, 29(S2): 3475-3481.
HUANG Wei1,SHEN Mingrong1,2,ZHANG Qingzhao1. STUDY OF UNLOADING DILATANCY PROPERTY OF ROCK AND ITS CONSTITUTIVE MODEL UNDER HIGH CONFINING PRESSURE. , 2010, 29(S2): 3475-3481.
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