- Design and Behavior of A Deep Excavation Adjacent to Existing Buildings and Tunnels
- Q. LI ; W.D. Wang ; Z.H. Xu
- ICGE Colombo 2015
- Year: 2015
- Deep Excavations ; Tunneling ; Instrumentation
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- 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 Engineering
- 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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- Landslides induced by the interaction of an earthquake and subsequent rainfall. A spatial and temporal model
- F. Nadim ; U. Eidsvig ; Z.Q. Liu ; B.V. Vangelsten ; B. Quan Luna
- Proceedings of the 18th International Conference on Soil Mechanics and Geotechnical Engineering, Paris, September 2-6 2013
- Year: 2013
- Landslides ; Numerical & Constitutive Modeling ; Geotechnical Earthquake Engineering
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- Optimizing Hydraulic Fracturing Treatment Integrating Geomechanical Analysis and Reservoir Simulation for a Fractured Tight Gas Reservoir, Tarim Basin, China
- F. Gui ; K. Rahman ; D. Moos ; V. Vassilellis ; C. Li ; Q. Liu ; F Zhang ; Ji. Peng ; X. Yuan ; G. Zou
- Book Title / Journal: Effective and Sustainable Hydraulic Fracturing
- Year: 2013 , Series: Chapter 52
- Numerical & Constitutive Modeling ; Centrifuge Testing
- Keywords: Hydraulic Fracturing Treatment ; Gas Reservoir
- Description
- A comprehensive geomechanical study was carried out to optimize stimulation for a frac‐
tured tight gas reservoir in the northwest Tarim Basin. Conventional gel fracturing and acidizing operations carried out in the field previously failed to yield the expected productivity. The objective of this study was to assess the effectiveness of slickwater or low-viscosity stimulation of natural fractures by shear slippage, creating a conductive, complex fracture network. This type of stimulation is proven to successfully exploit shale gas resources in many fields in the United States.
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- A Geotechnical Countermeasure for Combating Desertification
- N. Yasufuku ; Q. Liu
- Proceedings of the 18th International Conference on Soil Mechanics and Geotechnical Engineering, Paris, September 2-6 2013
- Year: 2013
- Other Geotechnical
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- Quantitative risk assessment for earthquake-triggered landslides using Bayesian network
- Z.Q. Liu ; F. Nadim
- Proceedings of the 18th International Conference on Soil Mechanics and Geotechnical Engineering, Paris, September 2-6 2013
- Year: 2013
- Risk & Reliability ; Landslides ; Geotechnical Earthquake Engineering
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- Long-term tunnel settlement mechanisms of Metro Line 2 in Shanghai
- C.W.W. Ng ; Q. Li ; G.B. Liu
- IS ROME '11
- Year: 2011
- Tunneling ; Settlements
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- Analysis of the factors influencing foundation pit deformations
- X.L. Kong ; J. Zhou ; K.H. Xie ; Y.Q. Li
- 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
- Settlements ; Foundation Design / Construction
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- The effect of deep excavation on pore water pressure changes in the Old Alluvium and under-drainage of marine clay in Singapore
- K.Q. Lin ; D. Wen
- Year: 2002
- Deep Excavations ; Groundwater & Seepage
- Description
- Geotechnical Aspects of Underground Construction in Soft Ground – Proceedings of the Third International Symposium on Geotechnical Aspects of Underground Construction in Soft Ground – IS-Toulouse 2002
Toulouse - France
October 23-25, 2002
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- A Geotechnical Countermeasure for Combating Desertification
- Q. Liu ; N. Yasufuku
- International Conference on Soil Mechanics and Geotechnical Engineering - 18th International Conference on Soil Mechanics and Geotechnical Engineering (Paris)
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- Soil Mechanics
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- Quantitative risk assessment for earthquake-triggered landslides using Bayesian network
- F. Nadim ; Z.Q. Liu
- International Conference on Soil Mechanics and Geotechnical Engineering - 18th International Conference on Soil Mechanics and Geotechnical Engineering (Paris)
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- Risk & Reliability ; Geotechnical Earthquake Engineering ; Landslides
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- Analysis of the factors influencing foundation pit deformations
- Y.Q. Li ; K.H. Xie ; J. Zhou ; X.L. Kong
- Underground Construction in Soft Ground Symposium (TC204) - IS SHANGHAI '08
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- Foundation Design / Construction
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- The strength of Perth sands in direct shear
- M.R. Jensen ; V. Zania ; B.M. Lehane ; Q. Liu ; C. Butterworth
- Australia - New Zealand Conferences on Geomechanics - 13th Australia New Zealand Conference on Geomechanics
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- Soil Mechanics ; Laboratory Testing
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- Interval Entropy Measurement Method in Risk Analysis and Its Application to Metro Construction
- J.W. LI ; L.Q. LI ; X.R.YANG
- TC304 Conferences On Engineering Practice of Risk Assessment and Management - 1st International Symposium on Geotechnical Safety and Risk (ISGSR 2007)
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- Risk & Reliability
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- The effect of deep excavation on pore water pressure changes in the Old Alluvium and under-drainage of marine clay in Singapore
- D. Wen ; K.Q. Lin
- Underground Construction in Soft Ground Symposium (TC204) - IS TOULOUSE '02
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- Deep Excavations
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