Damage evolution and constitutive model of limestone with horizontal fissure under the coupled effects of dry-wet cycling and precompression stress

作者：Shunbo Zhang, Zhongping Yang, Yang Gao, Miao Liu, Shanmeng Hou · 发表于：International Journal of Mining Science and Technology · 年份：2025 · DOI：10.1016/j.ijmst.2025.11.011 · 被引用次数：2 · 研究领域：Rock Mechanics and Modeling、Innovative concrete reinforcement materials、Geotechnical Engineering and Soil Mechanics

To reveal the influence of coupled effects of dry-wet cycling and precompression stress (CEDWCPS) on the damage evolution of limestone with horizontal fissure (LHF), a series of degradation and uniaxial compression tests were conducted, and a corresponding piecewise damage constitutive model (PDCM) was established. We found that both dry-wet cycling and precompression stress deteriorate the physical properties, alter the microscopic characteristics, and reduce the mechanical properties of the LHF. These degradations are particularly pronounced under the CEDWCPS, although the magnitude of these changes gradually diminishes with the progression of dry-wet cycling. Meanwhile, they also reduce the deformation degree, prolong the micropore compaction stage, shorten the unstable crack propagation stage, lower the frequency and intensity of AE events, decrease the high-amplitude and high-frequency AE signals, enlarge crack scales, and shorten the crack initiation time. Among the changes of these indicators, the dry-wet cycling plays a dominant role. The crack types of LHF under the CEDWCPS (LHFCEDWCPS) are predominantly tensile cracks, supplemented by shear cracks. The failure mode can be defined as tensile-shear composite failure. Finally, the established PDCM effectively captures the nonlinear deformation of micropore and the linear deformation of the matrix in LHFCEDWCPS, with all corresponding R 2 consistently exceeding 0.97.