Hydraulic Fracture Propagation in Fractured Rock Mass
Source abstract
Abstract
According to fracture mechanics theory, the initial cracking law and wing crack propagation model of compression shear rock cracks subjected to hydraulic pressure and far field stresses are discussed. The results of the theoretical study show that crack initiation strength is inversely related to hydraulic pressure, that hydraulic pressure aggravates the wing crack’s growth, and that the wing crack’s behavior under high hydraulic pressure shifts from stable to unstable expansion. The confining pressure is proportional to the rock mass strength, the wing crack’s stress intensity factor drops as the remote field stress σ3 increases, and the wing crack tends to expand stably. As the crack angle increases, the cracking strength reduces at first, then increases. At the same time, damage fracture mechanics models are established for the occurrence of wing crack-wing crack failure, wing crack-shear crack failure, wing crack-shear crack-wing crack failure, and shear crack-shear crack failure in the compression-shear crack bridge under far-field stress and hydraulic pressure. The link between hydraulic pressure, confining pressure, fracture angle, stress intensity factor, and compression-shear factor λ12 is also clarified. The value of the stress intensity factor increases when the hydraulic pressure decreases, the confining pressure increases, and the crack angle increases, whereas the compression-shear factor decreases. This study lays the groundwork for a quantitative assessment of fractured rock mass destruction under hydraulic pressure.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Rock Mechanics and Modeling · Landslides and related hazards · Geotechnical Engineering and Analysis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Resources and Safety Engineering, Central South University, Changsha 410083, China
China Railway Construction Group Corporation Limited, Beijing 100040, China
Funding
National Natural Science Foundation of China
References (40)
Show source-provided references
1. Modified hypothesis for failure of malpasset dam10.1016/0013-7952(87)90073-1 ↗
2. The rock slide in the Vajont Valley
3. Coupled analysis of flow, stress and damage (FSD) in rock failure10.1016/S1365-1609(02)00023-0 ↗
4. Theoretical model for tensile and shear crack initiation at the crack tip in rock subjected to hydraulic pressure
5. Crack propagation and coalescence of brittle rock-like specimens with pre-existing cracks in compression10.1016/j.enggeo.2014.12.010 ↗
6. A failure criterion for cracked rock mass under seepage pressure and confining pressure10.4028/www.scientific.net/AMR.225-226.937 ↗
7. Influence of seepage on the stability of rock slope-coupling of seepage and deformation by DDA method
8. Modeling of fluid flow and solid deformation for fractured rocks with discontinuous deformation analysis (DDA)method10.1016/S1365-1609(01)00005-3 ↗
9. Study on breakdown pressure in hydraulic fracturing process of hard rock based on numerical simulation10.1007/s10706-020-01531-y ↗
10. Numerical simulation of hydraulic fracture propagation characteristics of low permeable coal-rock mass10.4028/www.scientific.net/AMR.482-484.1668 ↗
11. Experimental research of fine sandstone strength and deformation characteristics under different confining and hydraulic pressure
12. Huang, W., Wang, H., Zhang, T., He, M., and Yan, L. (2020). Hydraulic pressure effect on mechanical properties and permeabilities of layered rock mass: An experimental study. Eur. J. Environ. Civ. Eng., 1–12.
13. Crack coalescence in molded gypsum and carrara marble: Part 1. macroscopic observations and interpretation10.1007/s00603-008-0002-4 ↗
14. Crack initiation, propagation and coalescence from frictional flaws in uniaxial compression10.1016/j.engfracmech.2010.06.027 ↗
15. Experimental investigation on the strength, deformability, failure behavior and acoustic emission locations of red sandstone under triaxial compression10.1007/s00603-011-0208-8 ↗
16. The damage mechanics of brittle solids in compression10.1007/BF00878002 ↗
17. Influence of heterogeneity of mechanical properties on hydraulic fracturing in permeable rocks10.1007/s00603-003-0022-z ↗
18. Rock burst process of limestone and its acoustic emission characteristics under true-triaxial unloading conditions10.1016/j.ijrmms.2009.09.003 ↗
19. Crack initiation characteristics of opening-mode crack embedded in rock-like material under seepage pressure
20. Criteria for brittle fracture in compression10.1016/0013-7944(90)90331-A ↗
21. Evolution procedure of multiple rock cracks under seepage pressure
22. Kohn-Sham density functional theory prediction of fracture in silicon carbide under mixed mode loading10.1088/0965-0393/24/3/035004 ↗
23. Breaking badly: Dft-d2 gives sizeable errors for tensile strengths in palladium-hydride solids10.1021/acs.jctc.5b00653 ↗
24. Damage stress and acoustic emission characteristics of the beishan granite10.1016/j.ijrmms.2013.09.003 ↗
25. Fracture mechanical behavior and AE characteristics of rock-like material containing 3-D crack under hydro-mechanical coupling
26. Rheologic fracture mechanism and failure criterion of rock cracks under compressive-shear load with seepage pressure
27. Damage fracture failure mechanism of compressive-shear rock cracks under seepage pressure
28. A critical review of common models in hydraulic-fracturing simulation: A practical guide for practitioners10.1016/j.tafmec.2021.102937 ↗
29. Papachristos, E. (2017). A 3D Hydro-Mechanical Discrete Element Model for Hydraulic Fracturing in Naturally Fractured Rock, Grenoble Alpes University.
30. Automatic pixel-wise detection of evolving cracks on rock surface in video data10.1016/j.autcon.2020.103378 ↗
31. Zhao, Y. (2009). Coupling Theory of and Seepage-Damage-Fracture in Fractured Rock Masses and Its Applications, Central South University.
32. The failure of brittle solids containing small cracks under compressive stress states10.1016/0001-6160(86)90086-6 ↗
33. Triaxial compression and acoustic emission tests on single cracked limestone and compressive-shear fracture model under hydraulic-mechanical coupling action
34. The damage fracture failure mechanism of compressive-shear rock cracks under high seepage pressure
35. Damage and fracture evolution of hydraulic fracturing in compression-shear rock cracks10.1016/j.tafmec.2014.06.013 ↗
36. Splitting failure properties of fractured rock under high water pressure
37. Liu, Q. (2019). Failure Characteristics of Single-Fracture Limestone Under Hydro Mechanical Coupling and Analysis of Insidious Fault Water Inrush, Hunan University of Science and Technology.
38. Compress shear fracture criterion of rock and it’s application
39. Failure mechanisms of brittle rock under uniaxial compression10.1515/jtam-2017-0014 ↗
40. Propagation-coalescence and rheologic fracture behavior of rock cracks