Physical and mechanical behaviors of a thermal-damaged coarse marble under uniaxial compression

To study the creep property of salt rock, uniaxial compression creep tests on salt rock specimens were carried out. The test results indicate that there is no steady creep of the salt rock used in ...

Creep properties and damage constitutive model of salt rock under uniaxial compression

The whole shear deformation of rock joints significantly affects the long-term behavior and safety of engineering projects. In this paper, a new damage constitutive model related to the Weibull dis...

A statistical damage constitutive model considering whole joint shear deformation

Energy evolution of brittle granite under different loading rates

To study the effect of loading rate on the mechanical properties of salt rock, uniaxial compression tests and acoustic emission tests at different loading rates were carried out on salt rock specim...

Mechanical properties and damage constitutive model for uniaxial compression of salt rock at different loading rates

Based on the “elastic modulus method” derived from the hypothesis of strain equivalence and test data of complete stress–strain curves of marble, granite, and sandstone under uniaxial compression, ...

A damage model for modeling the complete stress–strain relations of brittle rocks under uniaxial compression:

A quantitative model was recently proposed by Peng et al (2015) to characterize the crack closure behavior of rocks. The model can simulate the initial nonlinearity of stress–strain curves in uniaxial and triaxial compressions. However, the crack propagation behavior near peak and in the post-peak deformation stage cannot be captured by the model. This paper extends the model to simulate the complete stress–strain curves of rocks under uniaxial compression. A phenomenological damage model, which uses a logistic function to describe the damage evolution, is adopted to model the pre-peak and post-peak deformation stages beyond the crack closure stage. Combining the crack closure model and the damage model yields a new phenomenological model. A uniform continuity condition is used to ensure that the stress–strain curve is smooth and continuous at the junction point of the crack closure model and the damage model. The proposed model has four model parameters, which can be calibrated using laboratory test data. The uniaxial compression tests of the Carrara marble under different heating cycles are simulated to verify the proposed model. The simulated stress–strain curves agree well with the test data, from initial crack closure to near peak and post peak, suggesting that the model can be used for simulating the entire deformation stage of brittle rocks with different degrees of initial microcrack damage.

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Dongqiao Liu

Papers

A damage model for modeling the complete stress–strain relations of brittle rocks under uniaxial compression:

A Phenomenological Model of Brittle Rocks under Uniaxial Compression