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Numerical Simulation of Crack Evolution Under Hydraulic Fracturing of Medium-Hard Rock
The mechanical excavation technology, as a commonly used method in tunnel excavation of hard rock, has many shortcomings, such as poor geological adaptability and intense wear of cutter head and so on, affecting the excavation efficiency. The hydraulic fracturing technology can effectively evade these issues and achieve the efficient excavation by pre-fracturing rock. Therefore, taking medium-hard rock as an example, this paper established the numerical models of single-borehole and double-borehole hydraulic fracturing medium-hard rock based on the extended finite element method (XFEM), and explored the evolution law of cracks and the damage dissipation energy variation of the rock. Results indicated that under single-borehole hydraulic fracturing, the propagation length and width of the crack experienced the rapid growth period and slow growth period, and the damage dissipation energy of rock mainly experienced the step-like growth period. By the comparative analyses of crack propagation length and width evolution as well as the damage dissipation energy of rock under the single-borehole and double-borehole hydraulic fracturing, it is found that under the double-borehole hydraulic fracturing the propagation rate and damage dissipation energy of single prefabricated fracture are greatly in-creased, and the fracturing efficiency is greatly improved, compared with the single-borehole hydraulic fracturing. Results can provide a theoretical reference for improving the application level of hydraulic fracturing in tunnel excavation.
Numerical Simulation of Crack Evolution Under Hydraulic Fracturing of Medium-Hard Rock
The mechanical excavation technology, as a commonly used method in tunnel excavation of hard rock, has many shortcomings, such as poor geological adaptability and intense wear of cutter head and so on, affecting the excavation efficiency. The hydraulic fracturing technology can effectively evade these issues and achieve the efficient excavation by pre-fracturing rock. Therefore, taking medium-hard rock as an example, this paper established the numerical models of single-borehole and double-borehole hydraulic fracturing medium-hard rock based on the extended finite element method (XFEM), and explored the evolution law of cracks and the damage dissipation energy variation of the rock. Results indicated that under single-borehole hydraulic fracturing, the propagation length and width of the crack experienced the rapid growth period and slow growth period, and the damage dissipation energy of rock mainly experienced the step-like growth period. By the comparative analyses of crack propagation length and width evolution as well as the damage dissipation energy of rock under the single-borehole and double-borehole hydraulic fracturing, it is found that under the double-borehole hydraulic fracturing the propagation rate and damage dissipation energy of single prefabricated fracture are greatly in-creased, and the fracturing efficiency is greatly improved, compared with the single-borehole hydraulic fracturing. Results can provide a theoretical reference for improving the application level of hydraulic fracturing in tunnel excavation.
Numerical Simulation of Crack Evolution Under Hydraulic Fracturing of Medium-Hard Rock
Mechan. Machine Science
Atluri, Satya N. (editor) / Vušanović, Igor (editor) / Liu, Jialiang (author) / Li, Jinyang (author) / Zhu, Yujie (author) / Zhou, Dongping (author) / He, Hua (author) / Zhou, Junjie (author) / Wang, Kai (author)
International Conference on Computational & Experimental Engineering and Sciences ; 2021 ; Phuket, Thailand
2021-05-28
12 pages
Article/Chapter (Book)
Electronic Resource
English
Special Issue “Hydraulic Fracturing in Hard Rock”
| Online Contents | 2019
Special Issue “Hydraulic Fracturing in Hard Rock”
| Online Contents | 2019