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Numerical Study of the Strength and Characteristics of Sandstone Samples with Combined Double Hole and Double Fissure Defects

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  • Junbiao Ma

    (State Key Laboratory of Mine Disaster Prevention and Control, Shandong University of Science and Technology, Qingdao 266590, China)

  • Ning Jiang

    (State Key Laboratory of Mine Disaster Prevention and Control, Shandong University of Science and Technology, Qingdao 266590, China)

  • Xujun Wang

    (Jining No.3 Coal Mine, Yanzhou Coal Mining Company Limited, Jining 272100, China)

  • Xiaodong Jia

    (Jining No.3 Coal Mine, Yanzhou Coal Mining Company Limited, Jining 272100, China)

  • Dehao Yao

    (State Key Laboratory of Mine Disaster Prevention and Control, Shandong University of Science and Technology, Qingdao 266590, China)

Abstract

To explore the failure mechanism of rock with holes and fissures, uniaxial compression tests of sandstone samples with combined double hole and double fissure defects were carried out using Particle Flow Code 2D (PFC2D) numerical simulation software. The failure behaviour and mechanical properties of the sandstone samples with combined double hole and double fissure defects at different angles were analysed, and the evolution results of the stress field and crack propagation were studied. The results show that with a decrease in fissure angle, the crack initiation stress, damage stress, elastic modulus and peak stress of the defective rock decrease, while the peak strain increases, and the brittleness of the rock is weakened. Rocks with combined double hole and double fissure defects at different angles lead to different failure modes, crack initiation positions and crack development directions. After uniaxial compression, both compressive stress and tensile stress concentration areas are produced in the defective rock, but the compressive stress concentration is of primary importance. The concentration area is mainly distributed around the holes and fissures and the defect connecting line, and the stress concentration area decreases with the decreasing fissure angle. This study can correctly predict the mechanical properties of rock with combined double hole and double fissure defects at different angles and provide a reference for actual rock engineering.

Suggested Citation

  • Junbiao Ma & Ning Jiang & Xujun Wang & Xiaodong Jia & Dehao Yao, 2021. "Numerical Study of the Strength and Characteristics of Sandstone Samples with Combined Double Hole and Double Fissure Defects," Sustainability, MDPI, vol. 13(13), pages 1-16, June.
    • Handle: RePEc:gam:jsusta:v:13:y:2021:i:13:p:7090-:d:581144
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    References listed on IDEAS

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    1. Yuantian Sun & Guichen Li & Junfei Zhang & Jiahui Xu, 2020. "Failure Mechanisms of Rheological Coal Roadway," Sustainability, MDPI, vol. 12(7), pages 1-17, April.
    2. Wei Chen & Wen Wan & Yanlin Zhao & Wenqing Peng, 2020. "Experimental Study of the Crack Predominance of Rock-Like Material Containing Parallel Double Fissures under Uniaxial Compression," Sustainability, MDPI, vol. 12(12), pages 1-19, June.
    3. Houqiang Yang & Nong Zhang & Changliang Han & Changlun Sun & Guanghui Song & Yuantian Sun & Kai Sun, 2021. "Stability Control of Deep Coal Roadway under the Pressure Relief Effect of Adjacent Roadway with Large Deformation: A Case Study," Sustainability, MDPI, vol. 13(8), pages 1-14, April.
    4. Zhen Cui & Qian Sheng & Qingzi Luo & Guimin Zhang, 2021. "Investigating the Anisotropy of Mechanical Parameters of Schist Rock with Practical Numerical Methods," Sustainability, MDPI, vol. 13(2), pages 1-14, January.
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    Cited by:

    1. Yakang Li & Jiangwei Liu & Qian Yu, 2022. "Patterns of Influence of Parallel Rock Fractures on the Mechanical Properties of the Rock–Coal Combined Body," Sustainability, MDPI, vol. 14(20), pages 1-17, October.
    2. Ning Jiang & Ke Lv & Zhiyou Gao & Huixin Di & Junbiao Ma & Tianyi Pan, 2022. "Study on Characteristics of Overburden Strata Structure above Abandoned Gob of Shallow Seams—A Case Study," Energies, MDPI, vol. 15(24), pages 1-22, December.

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