- Theoretical and numerical studies of crack initiation and propagation in rock masses under freezing pressure and far-field stress
- Y. Kang ; Q. Liu ; X. Liu. ; S. Huang
- Book Title / Journal: Journal of Rock Mechanics and Geotechnical Engineering
- Year: 2014 , Volume: 6
- Rock Mechanics
- Keywords: rock masses ; freeze-thaw action ; stress intensity factor (SIF)
- Description
- Water-bearing rocks exposed to freezing temperature can be subjected to freeze–thaw cycles leading to crack initiation and propagation, which are the main causes of frost damage to rocks. Based on the Griffith theory of brittle fracture mechanics, the crack initiation criterion, propagation direction, and crack length under freezing pressure and far-field stress are analyzed. Furthermore, a calculation method is proposed for the stress intensity factor (SIF) of the crack tip under non-uniformly distributed freezing pressure. The formulae for the crack/fracture propagation direction and length of the wing crack under freezing pressure are obtained, and the mechanism for coalescence of adjacent cracks is investigated. In addition, the necessary conditions for different coalescence modes of cracks are studied. Using the topology theory, a new algorithm for frost crack propagation is proposed, which has the capability to define the crack growth path and identify and update the cracked elements. A model that incorporates multiple cracks is built by ANSYS and then imported into FLAC3D. The SIFs are then calculated using a FISH procedure, and the growth path of the freezing cracks after several calculation steps is demonstrated using the new algorithm. The proposed method can be applied to rocks containing fillings such as detritus and slurry.
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- Effect of soil stratification on pipe behaviour due to tunnelling-induced ground movements based on the displacement controlled method
- Z.G. Zhang ; M.S. Huang ; M.X. Zhang ; W.D. Wang
- IS ROME '11
- Year: 2011
- Tunneling
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- Quantification of dynamic tensile parameters of rocks using a modified Kolsky tension bar apparatus
- S. Huang ; Rong Chen ; K.W. Xia
- Book Title / Journal: Journal of Rock Mechanics and Geotechnical Engineering
- Year: 2010 , Volume: 2
- Rock Mechanics
- Keywords: Kolsky tension bar system ; dynamic tensile strength ; single pulse loading
- Abstract
For brittle materials, the tensile strength plays an important role in mechanical analyses and engineering applications. Although quasi-static direct and dynamic indirect tensile strength testing methods have already been developed for rocks, the dynamic direct pull test is still necessary to accurately determine the tensile strength of rocks. In this paper, a Kolsky tension bar system is developed for measuring the dynamic direct tensile strength of rocks. A dumbbell-shaped sample is adopted and attached to the bars using epoxy glue. The pulse shaping technique is utilized to eliminate the inertial effect of samples during test. The single pulse loading technique is developed for the effective microstructure analyses of tested samples. Two absorption devices are successfully utilized to reduce the reflection of waves in the incident bar and transmitted bar, respectively. Laurentian granite (LG) is tested to demonstrate the feasibility of the proposed method. The tensile strength of LG increases with the loading rate. Furthermore, the nominal surface energy of LG is measured, which also increases with the loading rate. PDF |
- Prediction of the onset of strain localization in non-coaxial plasticity
- M.S. Huang ; X.L. Lu ; J.G. Qian ; W.D. Wang
- 17th International Conference on Soil Mechanics and Geotechnical Engineering (Alexandria)
- Year: 2009
- Soil Mechanics
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- Lateral responses of piles due to excavation-induced soil movements
- F.Y. Liang ; M.S. Huang ; C.R. Zhang
- Geotechnical Aspects of Underground Construction in Soft Ground – Proceedings of the 6th International Symposium (IS-SHANGHAI 2008)
Shanghai - China
April 10-12, 2008
- Year: 2008
- Deep Excavations ; Pile Foundations ; Numerical & Constitutive Modeling ; Centrifuge Testing
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- Basal stability of braced excavations in K0-consolidated soft clay by upper bound method
- M.S. Huang ; X.Y. Song
- Geotechnical Aspects of Underground Construction in Soft Ground – Proceedings of the 6th International Symposium (IS-SHANGHAI 2008)
Shanghai - China
April 10-12, 2008
- Year: 2008
- Deep Excavations
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- Predicting the Permeability Function for unsaturated Soils using the Soil-Water Characteristic Curve
- M.D. Fredlund ; S. Huang ; A. Xing
- Canadian Geotechnical Journal, Vol. 31, pp. 533-546.
- Year: 1994
- Soil Mechanics
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- Effect of soil stratification on pipe behaviour due to tunnelling-induced ground movements based on the displacement controlled method
- Z.G. Zhang ; M.S. Huang ; M.X. Zhang ; W.D. Wang
- Underground Construction in Soft Ground Symposium (TC204) - IS ROME '11
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- Tunneling ; Numerical & Constitutive Modeling
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- Prediction of the onset of strain localization in non-coaxial plasticity
- M.S. Huang ; X.L. Lu ; J.G. Qian ; W.D. Wang
- International Conference on Soil Mechanics and Geotechnical Engineering - 17th International Conference on Soil Mechanics and Geotechnical Engineering (Alexandria)
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- Soil Mechanics ; Soil Mechanics
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- Liquefaction study for the Little Jackf ish Dyke
- K.T. Law ; J.H.S. Huang ; R. Zhu
- International Conference on Soil Mechanics and Geotechnical Engineering - 12th International Conference on Soil Mechanics and Foundation Engineering (Rio De Janeiro)
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- Liquefaction Engineering ; Levees
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- Basal stability of braced excavations in K0-consolidated soft clay by upper bound method
- X.Y. Song ; M.S. Huang
- Underground Construction in Soft Ground Symposium (TC204) - IS SHANGHAI '08
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- Slope Stability
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- Lateral responses of piles due to excavation-induced soil movements
- C.R. Zhang ; M.S. Huang ; F.Y. Liang
- Underground Construction in Soft Ground Symposium (TC204) - IS SHANGHAI '08
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- Pile Foundations ; Deep Excavations
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