Work

Mechanical testing and crack expansion law of heterogeneous rock under different angle crack conditions

Year: 2025

Type: article

Abstract: Based on the geological data of the Mu Gong Coal Mine in Guizhou Province and the specific engineering characteristics observed on-site, this study analyzed the influence of crack length, width and angle on the mechanical parameters of the surrounding rock composite specimens. The crack propagation behavior and failure characteristics of the composite specimens were investigated, providing a basis for tunnel support design. The experiments showed that as the crack length (10-30mm) and width (1.5-3mm) increased, the elastic modulus, peak strength and peak strain of the composite specimens gradually decreased; moreover, as the crack inclination angle (30°-60°) increased, the inclination angle of the crack at 45° was a turning point, with the elastic modulus, peak strength and peak strain initially decreasing and then increasing. Finally, a composite mechanical model was constructed to explore the instability mechanism of the composite specimens, and the instability process was divided into five stages.

Source: KSCE Journal of Civil Engineering

DOI: 10.1016/j.kscej.2025.100499

Authors: Weijian Yu, Chenhui Hu, Aoxiang Gu, Bizhang Tan, Desun Yu, Yaobing Qi

Institutions: Jiujiang Vocational University, Jiangxi Polytechnic University, Hunan University of Science and Technology

Language: English

Topic: Rock Mechanics and Modeling

Subfield: Mechanics of Materials

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $1,800

Funders: National Natural Science Foundation of China, Science and Technology Program of Hunan Province