Cool tessellation gradients9/15/2023 įarahmand K, Diederichs MS (2015) Implementation of a Cohesive Crack Model in Grain-based DEM Technique for Simulating Fracture in Quasi-Brittle Geomaterial. Įzzein FM, Bathurst RJ (2011) A transparent sand for geotechnical laboratory modeling. Smallest width of an adjoining zone ∆ σ ijīaldo JB, dos Santos WN (2002) Phase transitions and their effects on the thermal diffusivity behaviour of some SiO 2 polymorphs. Residual friction angle depending on contact slipping displacement and temperature ∆ F n Maximum shear force depending on temperature \(S_\) Heat flux in the positive i-direction Q net In general, the GBM is able to simulate the TM coupled behavior of polycrystalline rocks in a realistic manner. The damage degree of the 600 ☌ samples was up to six times higher than that of the 400 ☌, leading to a stronger strength reduction upon mechanical loading and a higher concave stress–strain nonlinearity caused by micro-crack closing at the beginning of loading. The residual thermal strain, which results from microcrack formation and the growth of pre-existing microcracks, was simulated and used as a quantitative index of thermally induced damages. Newly induced microcracks are rare during cooling due to the released stress concentrations of the local mineral grains. The P-wave velocities and the simulated thermal cracking revealed that the material contraction during cooling leads to a width reduction of the earlier heating-formed cracks. The models can well reproduce the real-time thermal expansion–contraction, microstructural changes, nonlinear stress–strain behavior, temperature-dependent strength, and the ultimate failure modes of thermal-damaged specimens. Based on the laboratory results, a newly developed TM coupled contact constitutive law considers mineral composition, heterogeneous temperature-dependent properties, reversible α ↔ β quartz-transitions, crack-slipping displacements with strength reduction, and real-time crack evolution. Uniaxial compression and Brazilian tests of EG specimens after 400 ☌ and 600 ☌ heating–cooling cycles were undertaken. This paper documents the thermo-mechanical response of Eibenstock granite (EG) through laboratory experiments and numerical simulations using a proposed TM coupled Grain-Based Model (GBM). Numerical modeling is a promising way to understand the characteristics of the thermo-mechanical (TM) coupled behaviors in rocks under high-temperature impact.
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