- The effect of fines type on correlation between shear wave velocity and liquefaction resistance of sand containing fines
- M.M. Ahmadi ; N. Akbari-Paydar
- Proceedings of the 18th International Conference on Soil Mechanics and Geotechnical Engineering, Paris, September 2-6 2013
- Year: 2013
- Liquefaction Engineering ; Soil Dynamics
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- Secondary Fractures and Their Potential Impacts on Hydraulic Fractures Efficiency
- A.D. Taleghani ; M. Ahmadi ; J.E. Olson
- Book Title / Journal: Effective and Sustainable Hydraulic Fracturing
- Year: 2013 , Series: Chapter 38
- Numerical & Constitutive Modeling
- Keywords: thermo‐ elastoplasticity analysis ; microfractures ; Finite Element Analysis
- Description
- Outcrop studies have revealed the presence of abundant cemented fractures in many low permeable formations. Recovered cores have also revealed the opening of some of these smaller size fractures on the wall surface of main hydraulic fractures. Furthermore, early production well-testing analysis in some of these cases provide estimates for hydraulically induced fracture surface areas which are much larger than the fracture dimensions estimated in fracturing design. Re-opening of these small-size fractures could be a possible reason for this discrepancy. In this paper, we show how and to what extent tensile stresses induced by temperature difference between fracturing fluid and formation fluid or plastic unloading of the formation rock could provide a large enough driving force to open a portion of these small cemented natural fractures laying on the surface of hydraulic fractures. Our thermoelastoplasticity analysis reveals the effect of net pressure, stratigraphy and also temperature of the fracturing fluid on the number of activated microfractures. Accordingly, potential distributions of activated micro-fractures are estimated. At the end, through an example, we show that the activation of only a small portion of cemented microfractures can increase the total formation contact surface considerably, and consequently increase the initial production by many folds
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- K0 determination of Sand Using CPT Calibration Chamber
- M.M. Ahmadi ; P. Karambakhsh
- 2nd International Symposium on Cone Penetration Testing, Huntington Beach, CA, USA. Volume 2&3: Technical Papers, Session 2: Interpretation, Paper No. 14
- Year: 2010
- Site Characterization & In-situ Testing (General)
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- Liquefaction evaluation based on CPTu soil classification chart
- M.M. Ahmadi ; A. Eslami ; M.R. Kangarani
- 17th International Conference on Soil Mechanics and Geotechnical Engineering (Alexandria)
- Year: 2009
- Liquefaction Engineering ; Cone Penetration Testing (CPT)
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- The effects of sample dimension and gradation on shear strength parameters of conditioned soils in EPBM
- H. Katebi ; H. Sabetamal ; M. Ahmadi-adli ; M. Hajialilue-Bonab
- 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
- Soil Mechanics
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- Experimental study on compressibility behavior of foamed sandy soil
- M. Ahmadi-adli ; H. Katebi ; H. Sabetamal ; M. Hajialilue-Bonab
- 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
- Geofoam ; Soil Mechanics
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- The effect of fines type on correlation between shear wave velocity and liquefaction resistance of sand containing fines
- N. Akbari-Paydar ; M.M. Ahmadi
- International Conference on Soil Mechanics and Geotechnical Engineering - 18th International Conference on Soil Mechanics and Geotechnical Engineering (Paris)
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- Liquefaction Engineering ; Geotechnical Earthquake Engineering
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- The effects of sample dimension and gradation on shear strength parameters of conditioned soils in EPBM
- M. Hajialilue-Bonab ; M. Ahmadi-adli ; H. Sabetamal ; H. Katebi
- Underground Construction in Soft Ground Symposium (TC204) - IS SHANGHAI '08
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- Tunneling
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- Experimental study on compressibility behavior of foamed sandy soil
- M. Hajialilue-Bonab ; H. Sabetamal ; H. Katebi ; M. Ahmadi-adli
- Underground Construction in Soft Ground Symposium (TC204) - IS SHANGHAI '08
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- Soil Mechanics ; Laboratory Testing
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- Liquefaction evaluation based on CPTu soil classification chart
- M.M. Ahmadi ; A. Eslami ; M.R. Kangarani
- International Conference on Soil Mechanics and Geotechnical Engineering - 17th International Conference on Soil Mechanics and Geotechnical Engineering (Alexandria)
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- Liquefaction Engineering ; Cone Penetration Testing (CPT)
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