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An Improved Form of SPH Method and Its Numerical Simulation Study on the Rock Crack Propagation Containing Fissures and Holes

  • Research Article-Civil Engineering
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Abstract

Defects widely exist in rock masses, which have great impacts on the rock mechanical properties. The pre-existing fissures and holes are two common rock defects. In order to study the influence of hole shapes and fissure geometries on the failure modes and mechanical properties of rock masses, the derivatives of kernel functions in the traditional SPH method have been improved by introducing a fracture mark ξ, and a novel numerical method named improved kernel of smoothed particle hydrodynamics (IKSPH) has been developed to realize the simulations of rock fracture processes. The Monte Carlo method has also been introduced into the proposed method to realize the formations of random fissures. The small-scale numerical rock specimens with different hole shapes as well as random fissures are established. The crack propagation processes, the failure modes and the mechanical properties under uniaxial compression are simulated, results show that: ‘Wing cracks’ initiate from the random fissures, whose locations and interaction modes differ according to the geometries of random fissures. For rectangle hole, the crack initiations mainly occur at the upper and lower edges as well as the corners; for circular hole, tensile cracks appear at the 6 and 12 o’clock directions, meanwhile, shear cracks initiate at the 5 and 7 o’clock direction after the tensile crack propagates to a certain extent; for trapezoid and triangle hole, crack initiations mostly appear at the corners of the hole; the length and quantity of pre-existing fissures have greater influences on the mechanical properties of rock masses than the hole shapes and fissure dip angles. The research results can provide guidance for the correct understandings of fractured rock mechanisms. Meanwhile, the proposed method can also provide references for the applications of SPH method into simulations of rock fracture mechanics. At the same time, future research focus should be put on the applications of IKSPH method into engineering practices and developing high-performance IKSPH programming.

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Acknowledgements

We acknowledge the financial supports of the National Natural Science Fund (Grant No. U1765204), and the National Natural Science Found (51409170).

Funding

Project (U1765204) supported by National Natural Science Foundation of China; Project (51409170) supported by National Natural Science Foundation of China; “the Fundamental Research Funds for the Central Universities” (B210203078).

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Authors and Affiliations

  1. College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, 210098, China

    Xu-Hua Ren, Shu-Yang Yu & Ji-Xun Zhang

  2. School of Transportation and Civil Engineering, Nantong University, 9 Seyuan Road, Nantong, 226019, China

    Shu-Yang Yu & Hai-Jun Wang

  3. State Key Laboratory of Hydrology-Water Resource and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing, 210029, China

    Zhao-Hua Sun

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  1. Xu-Hua Ren
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  4. Ji-Xun Zhang
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Contributions

X-HR provided the ideas, S-YY did the numerical simulation and wrote the draft, H-JW, J-XZ, Z-HS edited the draft.

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Correspondence to Shu-Yang Yu.

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Ren, XH., Yu, SY., Wang, HJ. et al. An Improved Form of SPH Method and Its Numerical Simulation Study on the Rock Crack Propagation Containing Fissures and Holes. Arab J Sci Eng 46, 11303–11317 (2021). https://doi.org/10.1007/s13369-021-05784-4

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  • DOI: https://doi.org/10.1007/s13369-021-05784-4

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