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

Haiping Zhang, Siqi Li (), Zhuo Chen, Yeshuang Tong, Zhuolun Li and Siqi Wang
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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

Energies, 2022, vol. 15, issue 21, 1-14

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.

Keywords: harmonic dynamic load; rock fracture; extended finite element; stress intensity factor; fracture characteristics (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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