Failure microscopic mechanism and damage constitutive model of dolomite under water-rock coupling interaction

Abstract

To investigate the effects of water and cyclic loading on dolomite’s mechanical properties during deep mining, mechanical experiments on non-pressure water absorption and cyclic loading were conducted. The findings reveal that the elastic modulus and Poisson ratio of dolomite fluctuate with increasing water content. The mass of water absorption is positively correlated with time and the water absorption stage can be divided into three stages: accelerated, decelerated, and stabilized stages. During this process, the number of pores in dolomite increases, while the pore diameter initially decreases and then fluctuates. Microscopic analysis shows that the proportion of mesopores first increases and then decreases, while micropores exhibit the opposite trend, and the proportion of macropores fluctuates around 0%. A model diagram of structural evolution during water absorption has been developed. Additionally, the softening process of dolomite’s water absorption strength is categorized into three stages: a relatively stable stage, an accelerated softening stage dominated by mesopore water absorption, and a decelerated softening stage characterized by micropore water absorption. A uniaxial damage constitutive model for dolomite under water influence was established based on the Weibull distribution and Mohr-Coulomb strength criterion, and experimental validation indicates its strong applicability.

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