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Fracture Mechanism of Crack-Containing Strata under Combined Static and Harmonic Dynamic Loads Based on Extended Finite Elements

Author

Listed:
  • Haiping Zhang

    (State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 102206, China)

  • Siqi Li

    (Institute of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, China)

  • Zhuo Chen

    (Institute of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, China)

  • Yeshuang Tong

    (Institute of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, China)

  • Zhuolun Li

    (Institute of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, China)

  • Siqi Wang

    (Institute of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, China)

Abstract

Based on the existing research results, a theoretical fracture model of strata under the compound impact of static and harmonic dynamic load is improved, and the fracture characteristic parameters (stress intensity factor, T-stress, and fracture initiation angle) under the two far-field stress are determined according to the crack dip angle. Additionally, the effects of harmonic dynamic load on the distribution of the stress field and the fracture characteristic (the crack initiation angle, the fracture degree, the number of fracture units, and the fracture area) are further calculated and discussed by theoretical model solution, extended finite element simulation, and the secondary development of the simulation module, respectively. The research results show that the far-field stress, stress intensity factor, and T-stress vary in harmonic form with time under the compound impact of static and harmonic dynamic loads. The frequency of dynamic load affects the number of reciprocal fluctuations of stress intensity factor and T-stress as well as the crack initiation time, but has less influence on the crack initiation angle and fracture degree. While the amplitude of dynamic load affects the stress intensity factor, the extreme value of T-stress and fracture characteristics of the crack. This study has theoretical guiding significance for parameters’ optimization and realization of resonance impact drilling technology.

Suggested Citation

  • Haiping Zhang & Siqi Li & Zhuo Chen & Yeshuang Tong & Zhuolun Li & Siqi Wang, 2022. "Fracture Mechanism of Crack-Containing Strata under Combined Static and Harmonic Dynamic Loads Based on Extended Finite Elements," Energies, MDPI, vol. 15(21), pages 1-14, October.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:21:p:7940-:d:953296
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    References listed on IDEAS

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    1. Peng Kong & Lishuai Jiang & Jinquan Jiang & Yongning Wu & Lianjun Chen & Jianguo Ning, 2019. "Numerical Analysis of Roadway Rock-Burst Hazard under Superposed Dynamic and Static Loads," Energies, MDPI, vol. 12(19), pages 1-19, September.
    2. Siqi Li & Shenglei Tian & Wei Li & Xin Ling & Marcin Kapitaniak & Vahid Vaziri, 2020. "Numerical Study on the Elastic Deformation and the Stress Field of Brittle Rocks under Harmonic Dynamic Load," Energies, MDPI, vol. 13(4), pages 1-16, February.
    3. Jing Jin & Xiaoyong Liang & Guangqing Yang & Yitao Zhou, 2022. "Test Studies on Geogrid–Soil Interface Behavior under Static and Dynamic Loads," Sustainability, MDPI, vol. 14(7), pages 1-15, April.
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