Analysis of Mechanical Behavior and Damage Characteristics of Fractured Sandstone under Triaxial Stress Load

HU Huarui; LIU Shiwei; WANG Wende; WANG Haoming; ZHANG Yangkai

doi:10.13779/j.cnki.issn1001-0076.2025.02.002

2025 Vol. 45, No. 2

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HU Huarui, LIU Shiwei, WANG Wende, WANG Haoming, ZHANG Yangkai. Analysis of Mechanical Behavior and Damage Characteristics of Fractured Sandstone under Triaxial Stress Load[J]. Conservation and Utilization of Mineral Resources, 2025, 45(2): 14-21. doi: 10.13779/j.cnki.issn1001-0076.2025.02.002

Citation:

HU Huarui, LIU Shiwei, WANG Wende, WANG Haoming, ZHANG Yangkai. Analysis of Mechanical Behavior and Damage Characteristics of Fractured Sandstone under Triaxial Stress Load[J]. Conservation and Utilization of Mineral Resources, 2025, 45(2): 14-21. doi: 10.13779/j.cnki.issn1001-0076.2025.02.002

Analysis of Mechanical Behavior and Damage Characteristics of Fractured Sandstone under Triaxial Stress Load

1.
Institute of Deep Earth Science and Green Energy, Shenzhen University, Shenzhen 518060, Guangdong, China
2.
Hunan Chenzhou Mining Co., LTD., Huaihua 419600, Hunan, China
3.
China Construction Fifth Engineering Division Co., Ltd., Changsha 410004, Hunan, China
4.
Jiangxi Copper Co., LTD., Nanchang 330000, Jiangxi, China
5.
China Railway Tunnel Group Co., Ltd., Guangzhou 511458, Guangdong, China
6.
State Key Laboratory of Shield Machine and Boring Technology, State Key Laboratory of Tunnel Boring Machine and Intelligent Operations, Zhengzhou 450001, Henan, China

Received Date: 15 February 2025

Publish Date: 15 April 2025

Abstract

Abstract

The damage and failure characteristics of deep rock are significantly different from those of shallow rock. Investigating the mechanical behavior of fractured sandstone under complex stress environments is crucial for ensuring the safe implementation of deep underground engineering projects. Taking sandstone samples with cracks of different angles as research objects, triaxial compressive mechanical experiments were carried out. The evolution law of the mechanical properties of the fractured sandstone foundation was analyzed, and the influence law of the crack on the mechanical properties of the sample was explored by means of the energy dissipation theory. The results show that the crack angle has little effect on the deformation and failure law of the sample, and the axial stress−strain evolution law of sandstone with different crack angles shows an inverted "V" shape, first increasing and then decreasing. The radial stress−strain curve increases at first and then decreases slowly. The post−peak stage shows a similar yield platform, with the maximum axial and radial strain being 0.86% and 0.32%, and the minimum strain being 0.37% and 0.19%, respectively. The axial deformation degree of the specimen is larger than that of the radial deformation, and the axial deformation degree increases with the increase of the crack angle. Both peak strength and elastic modulus exhibited linear growth with the increase of crack angle, the peak strength and elastic modulus of the sample increase linearly, but the increase amplitude decreases first and then increases. As the angle increases from 0° to 30°, 45°, 60° and 90°, the strength of adjacent samples increased successively in the latter compared with the former by 8.58%, 3.16%, 1.34% and 15.12%, and the elastic modulus increases by 5.46%, 0.07%, 3.13% and 3.74%. The changes of total energy, elastic energy and dissipative energy of different samples are basically the same. Energy analysis revealed consistent trends across specimens: total energy and elastic energy accumulated faster than dissipative energy, with rapid dissipation energy growth preceding failure. Defined energy parameters showed that the energy storage coefficient progressively increased (0.615, 0.618, 0.642, 0.662, 0.712) while the energy dissipation coefficient decreased (0.159, 0.153, 0.142, 0.139, 0.127) with the angle increases from 0°, 30°, 45°, 60°, and 90°. This inverse relationship demonstrates that specimens with higher strength possess greater energy storage capacity, reduced energy dissipation, and enhanced deformation resistance.
- triaxial compression test /
- deep fractured sandstone /
- energy dissipation /
- crack angle /
- mechanical properties

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