| Summary: | 碩士 === 國立臺灣大學 === 土木工程學系研究所 === 86 === A constitutive model for rock joint behaviour from the view
point of the micro-mechanics is proposed first. The undulation
of joint profile is modeled by joint elements. The mechanical
behaviour between two corresponding joint elements are simulated
by the interface element that is connected with normal and shear
stiffness spring. The model considers force equilibrium and moment
equilibrium of joint profile.On the failure mode of the asperities,
the model considers slidin, seperatio, shear failur, crushing
failure and tensile failure. At last,by the contribution of any two
dimensional joint profile to the mechanical behaviour of three
dimensional joint profile,the three dimensional joint behaviour is
evaluated by means of several representative profiles. The two
dimensional constitutive model expands into quasi-three dimensional
constitutive model.A laboratory direct shear testing program on both
artificial joints with regular intended sawtooth geometry and with
irregular surfaces from brazilian splitting of granite was udertaken
to validate the consitutive model. Relatively good agreement was
achieved between the simulated and experimental results.
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