Triaxial Creep Mechanical Behaviors and Creep Damage Model of Dolomitic Limestone Material under Multi-Stage Incremental Loading

This research-oriented project focuses on evaluating the long-term mechanical stability and deformation characteristics of dolomitic limestone under complex stress states, which is critical for tunnel engineering and deep underground excavations. Utilizing experimental data from conventional triaxial compression and multi-stage incremental axial loading creep tests under varying confining pressures (specifically 9 MPa and 15 MPa), the study investigates the transition of rock behavior from brittle to ductile. The analysis details the evolution of axial, radial, and volumetric strains, highlighting the distinct phases of compaction and dilatancy-dominated deformation. Based on these experimental observations, a comprehensive creep damage constitutive model is structured to capture the attenuation, steady-state, and accelerating creep stages of the

rock material. The project provides structured guidance for implementing this damage model into numerical simulation frameworks, enabling the prediction of time-dependent deformation and failure modes in rock structures. This methodology serves as a valuable resource for academic research and engineering design in rock mechanics, solid mechanics, and underground structural stability assessment.

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