Work

Analysis of fracture modes and acoustic emission characteristics of low‐frequency disturbed coal rock bodies with different cyclic amplitudes

Year: 2024

Type: article

Abstract: Frequent mining operations significantly disturb the security of deep weakly cemented rock roadways in western mining areas, constituting one of the primary causes of deformation, instability, and failure within the coal‐rock body. In this paper, dynamic uniaxial compression tests of soft rock‐coal combinations under low‐frequency disturbance with different cyclic amplitudes were conducted based on acoustic emission to elucidate fracture modes. The findings are as follows: Different cycle amplitudes manifested significant degradation effects on the soft rock‐coal combination. With increasing cycle amplitude, the proportion of tensile cracks initially decreased before subsequently increasing, demonstrating a general upward trajectory. The sudden increase in the acoustic emission RA value, the large decrease in the b‐value, and AE counts reaching the peak mean that failure and destabilization of the specimen begin to occur. The results of this study will furnish theoretical direction for dynamic disaster monitoring and early warning in soft rock mines located in western mining regions.

Source: Fatigue & Fracture of Engineering Materials & Structures

DOI: 10.1111/ffe.14434

Authors: Bin Liang, Dong Wang, Yujing Jiang, Hengjie Luan, Jiankang Liu, Jianlong Wang

Institution: Shandong University of Science and Technology

Language: English

Topic: Rock Mechanics and Modeling

Subfield: Mechanics of Materials

Field: Engineering

Domain: Physical Sciences

Open Access status: bronze

Funders: National Natural Science Foundation of China, Natural Science Foundation of Shandong Province, State Key Laboratory for GeoMechanics and Deep Underground Engineering

Awards: G1986374586, G6874482280, G8264655850, G8473012337