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Numerical study on strength and failure characteristics of rock samples with different hole defects

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Abstract

In a rock mass, holes of various sizes and geometries naturally occur, which in turn can affect the mechanical properties of the rock mass. These defects often cause engineering problems in subsurface construction. In this study, PFC2D was used to perform uniaxial compression tests on a rock mass containing ten different types of hole defects to analyze their failure behavior and mechanical properties. Four failure modes were determined, and crack propagation and stress field evolution were studied. The results show that the hole defect reduces the uniaxial compressive strength, peak strain, and elastic modulus of a rock mass. Also, these defects accelerate the generation of cracks and promote the destruction of the rock. The failure modes can be classified as Y-type, inverted Y-type, upper left to lower right type, and upper right to lower left type. Before cracks are generated, the compressive stress concentration area is located on the left and right sides of the hole and distributed as a butterfly shape, and the tensile stress concentration area is located in the upper and lower parts of the hole. A zone where stress is decreasing is located near the tip of the tensile stress triangular area. The magnitude and concentration area of compressive and tensile stresses are greatly affected by various hole geometries. Finally, the maximum principal compressive stress decreases instantly after a crack coalesces. Overall, the hole shape has a noticeable influence on the stress distribution surrounding the hole, and a hole defect reduces the degree of failure of a rock mass.

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Funding

This study was supported by the National Natural Science Foundation of China (51474134, 51774194), Shandong Provincial Natural Science Foundation for Distinguished Young Scholars (JQ201612), Major Basic Research Projects of Shandong Natural Science Foundation (ZR2018ZC07 40), and Taishan Scholar Talent Team Support Plan for Advantaged & Unique Discipline Areas.

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Authors and Affiliations

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

    Shaojie Chen, Zhiguo Xia, Fan Feng & Dawei Yin

  2. School of Resources and Civil Engineering, Northeastern University, Shenyang, 110819, Liaoning, China

    Fan Feng

Authors
  1. Shaojie Chen
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  2. Zhiguo Xia
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  3. Fan Feng
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  4. Dawei Yin
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Corresponding author

Correspondence to Zhiguo Xia.

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Chen, S., Xia, Z., Feng, F. et al. Numerical study on strength and failure characteristics of rock samples with different hole defects. Bull Eng Geol Environ 80, 1523–1540 (2021). https://doi.org/10.1007/s10064-020-01964-y

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  • DOI: https://doi.org/10.1007/s10064-020-01964-y

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