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The hydraulic fracturing in the earth‐rock fill dams is a very complicated and important problem. In this chapter, a failure criterion for the occurrence of the hydraulic fracturing was proposed based on the fracture testing results of a core soil in the Chapter 5 and the theories in Lineal Elastic Fracture Mechanics. The proposed failure criterion for the hydraulic fracturing was verified by the analyses of the hydraulic fracturing in a cubic specimen and in the core of the earth‐rock fill dam. The analyzing results indicated that the factors, such as the angle between the crack surface and the directions of the principal stresses, the local stress state at the crack, and the fracture toughness KIC of core soils, may largely affect the induction of the hydraulic fracturing and the mode of the propagation of the crack. The propagation of the crack in the cubic specimen under the water pressure may follow the mixed mode I‐II if the crack plane is not perpendicular to any of the principal stresses, and the easiest propagating crack is that perpendicular to the minor principal stress and propagates following the mode I. The easiest spreading and dangerous crack in all transverse cracks at the upstream surface of the core under the water pressure is the horizontal crack, and that in all vertical cracks is the cross‐vertical crack. The comparison of the two major cracks does not allow to determine which one is more dangerous, because the stress state at the crack does have large influence on the induction of the hydraulic fracturing and on the mode of the crack propagation.
The hydraulic fracturing in the earth‐rock fill dams is a very complicated and important problem. In this chapter, a failure criterion for the occurrence of the hydraulic fracturing was proposed based on the fracture testing results of a core soil in the Chapter 5 and the theories in Lineal Elastic Fracture Mechanics. The proposed failure criterion for the hydraulic fracturing was verified by the analyses of the hydraulic fracturing in a cubic specimen and in the core of the earth‐rock fill dam. The analyzing results indicated that the factors, such as the angle between the crack surface and the directions of the principal stresses, the local stress state at the crack, and the fracture toughness KIC of core soils, may largely affect the induction of the hydraulic fracturing and the mode of the propagation of the crack. The propagation of the crack in the cubic specimen under the water pressure may follow the mixed mode I‐II if the crack plane is not perpendicular to any of the principal stresses, and the easiest propagating crack is that perpendicular to the minor principal stress and propagates following the mode I. The easiest spreading and dangerous crack in all transverse cracks at the upstream surface of the core under the water pressure is the horizontal crack, and that in all vertical cracks is the cross‐vertical crack. The comparison of the two major cracks does not allow to determine which one is more dangerous, because the stress state at the crack does have large influence on the induction of the hydraulic fracturing and on the mode of the crack propagation.
Hydraulic Fracturing Criterion
Wang, Jun‐Jie (author)
2014-03-10
24 pages
Article/Chapter (Book)
Electronic Resource
English
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