Abstract
In the current paper, the deformation behaviours of rocks during compression are studied by testing 10 groups of sandstone samples with different porosity characteristics. According to the energy theory, the rock material was divided into two parts: solid skeleton and voids. A statistical damage‐based approach was adopted to establish a nonlinear statistical damage constitutive model. The validity of the statistical damage constitutive model is verified by the test data. The statistical damage constitutive model performs well in each stage of rock compression before failure. For different types of rocks, different confining pressures, and different water contents, the statistical damage constitutive model fits well. This model can be applied to most types of rocks and in most engineering environments.
Highlights
Previous research [1,2,3,4,5,6,7] has shown that compression of rock materials typically involves four stages: (a) initial compression stage, (b) linear elastic deformation stage, (c) yield stage, and (d) failure stage. e stress-strain behaviour of rock is significantly influenced by the size and number of voids [8,9,10]
According to the energy principle, the rock material was divided into two parts: solid skeleton and void
Particular attention is paid to the deformation behaviour of rock in the initial compression stage
Summary
Previous research [1,2,3,4,5,6,7] has shown that compression of rock materials typically involves four stages: (a) initial compression stage, (b) linear elastic deformation stage, (c) yield stage, and (d) failure stage. e stress-strain behaviour of rock is significantly influenced by the size and number of voids [8,9,10]. As the materials in these models are commonly regarded as a set of units, springs, or beams bonded together, these models can simulate only elastoplastic materials Such software usually offers an interface where user-defined material models can be used, allowing us to construct a constitutive model more suitable for porous rock materials. Such a model would be significant for the numerical simulation of rock engineering applications. We aimed to propose a statistical damage constitutive model that can effectively simulate the plastic deformation process during the initial compression stage. En, it is assumed that the strength of microcells of the solid skeleton follows the Weibull distribution In this way, we proposed a nonlinear statistical damage constitutive model of rock that considers the initial compression stage
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