Profile

Ali Lashkari

Academic Appointments

Full Professor, Department of Civil and Environmental Engineering, Shiraz University of Technology (Nov. 2021 to Now)
Associate Professor, Department of Civil and Environmental Engineering, Shiraz University of Technology (July 2014 to Nov. 2021)
Assistant Professor, Department of Civil and Environmental Engineering, Shiraz University of Technology (Sept. 2009 to July 2014)

Head of the Department of Civil and Environmental Engineering, Shiraz University of Technology (Dec. 2020 to Now)
Head of the Department of the Geotechnical Engineering Division at the Department of Civil and Environmental Engineering, Shiraz University of Technology (Oct. 2010 to Oct. 2017 [selected for three consecutive periods])

Honors & Awards

Award for Excellence in Teaching, Shiraz University of Technology (2010)
Award for Excellence in Research, Shiraz University of Technology (2011)
Award for Excellence in Research, Shiraz University of Technology (2015)
Award for Excellence in Research, Shiraz University of Technology (2017)
Award for Excellence in Teaching, Shiraz University of Technology (2019)

Contact

Email: lashkari@sutech.ac.ir

Professional Education

Ph.D. in Geotechnical Engineering, University of Tehran (October 2003 to March 2007)

Thesis: “A non-coaxial sand constitutive model for sands”

M.Sc. in Geotechnical Engineering, University of Tehran (October 2000 to October 2002)

Thesis: “Influence of state parameter in elastoplastic sand constitutive models”

B.Sc. in Civil Engineering, Shiraz University (October 1995 to July 2000)

Courses

Courses Taught:

Advanced Soil Mechanics
Continuum Mechanics and Plasticity in Geomechanics
Modeling in Soil Mechanics
Micromechanics
Soil Dynamics and Earthquake Engineering
Engineering with Geosynthetics
Earthquake Engineering

SUTech advisees

PhD theses supervised:

Salimi MJ. DEM simulation of true triaxial behavior of granular soils (March, 2020)

Vahid Jamali. Global and local behavior of soil-structure interfaces (January, 2020)

Aliyeh Afzali-Nejad. Experimental study on the influence of soil anisotropy on the behavior of sand-geosynthetic interfaces (December, 2019)

MSc theses supervised:

Alaleh Ostovar. A modified sand-structure interface model with fractional order plasticity (Feb. 2021)

Mohammad-Reza Razavi. A constitutive model for particle breakage at sand-steel interfaces (July, 2020).

Ayoub Talebi. A modified SaniClay model with fractional order plasticity (February, 2020)

Behnam Jooyandeh. Simulation of silty sands behavior using an anisotropic critical state constitutive model (Jan, 2020)

Khosravifard-Shirazi M. Experimental investigation on particle breakage in Bushehr carbonate sand-steel interfaces (July, 2019)

Falsafizadeh SR. Flow liquefaction of Firoozkuh No. 161 sand under shear-volume coupled direct simple shear strain paths (July, 2019)

Seyed-Saeed Sahebkar. Constant volume direct simple shear tests on the influence of non-plastic silt on the behavior of Firoozkuh No. 161 sand (Jan. 2019)

Narges Norouzi. A modified elastic-plastic constitutive model for anisotropic sands. (Jan. 2019)

Mohammad-Javad Alipour. Prediction of the granular soils behavior subjected to constant shear drained stress paths using an elastoplastic constitutive model. (December, 2017).

Yaghtin MS. Prediction of instability in granular soils subjected to partially drained strain paths using and elastoplastic constitutive model. (July, 2017).

Iman Memarzdeh. Experimental study on effect of structure on compression behavior of Shiraz fine soil. (November, 2016).

Mitra Khodadadi. Simulation of instability of granular soils subjected to drained constant shear stress paths using Discrete Element Method. (September, 2016).

Ali Karimi. Prediction of liquefaction instability of saturated granular soils. (August, 2016).

Aliyeh Afzali-Nejad. Experimental study on the behavior of sand-geotextile interfaces. (February, 2016).

Ehsan Torkanlou. A constitutive model for partially saturated soil-structure interfaces. (February, 2016).

Masoomeh Karimi. Effect of fines content on critical state of binary granular soils. (February, 2016).

Hoda Abbasi. Modification of strain wedge method for laterally loaded piles in sand by a state-dependent sand constitutive model. (February, 2015).

Zahra Ashkar. A new hyperelastic model for sands. (February, 2015).

Mohsen Mahboubi-Nia. Numerical study of the seismic behavior of retaining walls. (February, 2015).

Benyamin Farhadi. Experimental study of the behavior of sand-steel interfaces. (February, 2015).

Armaghan Badi. 3-D simulation of shear banding in granular soils using and advanced constitutive model. (March, 2014).

Saeedeh Naziri. An elasto-plastic constitutive model for unsaturated fine soils. (January, 2014).

Mehdi Kadivar. A constitutive model for unsaturated soil-structure interfaces. (January, 2014).

Fatemeh Vahidi-Nia. Study on the influence of the change in sand gradation using direct shear apparatus. (November, 2013).

Meisam Mahboubi Niazmandi. Improvement of a constitutive model for cohesive soils with respect to the stress induced anisotropy of elasticity. (February, 2013).

Ali Yaghfouri. Study of seismic stability of saturated sand slopes. (January, 2013).

Ali Golchin. A hyper-elastic model for granular soils. (December, 2012).

Current Research

Research Interests

Constitutive Modeling of sands and clays

Modeling of the state-dependent behavior of sands
Modeling of the influence of soil anisotropy on the stress-strain-strength response of sands and clays using anisotropic critical state and rotational hardening theories
Modeling of soil behavior under cyclic loadings and considering previous loading histories
Modeling non-coaxial flow of sands
Application of thermodynamics in modeling of sand and clay behavior
Modeling of partially saturated sands and clays
Modeling particle breakage
classical elastoplasticity, bounding surface plasticity, and Pastor-Zienkiewicz (PZ) generalized plasticity theories for sands and clays
non-classical (modern) trends in soil modeling like hypoplasticity theory

2. Soil-Structure Interface Behavior

Experimental investigation of the mechanical behavior of soil-steel and soil-geosynthetic interfaces based on direct simple shear, direct shear and pullout tests
Constitutive modeling of the mechanical behavior of different sand-structure (e.g., sand-steel and sand-geosynthetic) interfaces
Experimental investigation and modeling of the influence of soil anisotropy on the behavior of sand-steel and sand-geosynthetic interfaces
Using PIV technology for particle scale investigation of sand-steel and sand geosynthetic interfaces
Constitutive modeling of partially saturated interfaces
Experimental investigation and constitutive modeling of soil-pipe interfaces for pipe jacking

3. Sand Liquefaction

Experimental investigation of sand liquefaction using cyclic direct simple shear and triaxial apparatuses
Constitutive modeling of liquefaction using the classical theory of elastoplasticity, bounding surface plasticity, Pastor-Zienkiewicz (PZ) generalized plasticity, and hypoplasticity theories
Modeling of sands liquefaction using Discrete Element Method (DEM)

4. Discrete Element Method in Soil Mechanics

Investigation of the multiscale response of particulate media using computer codes developed based on the micromechanics of discontinuous media (e.g., PFC3d, and True BALL)

5. Experimental Soil mechanics

Mechanical behavior of structured clays
Soil tests using Oedometer cell, Direct Shear, Direct Simple Shear (DSS), and triaxial (for cyclic, TXC and TXE tests) apparatuses
Investigation of the effect of particles morphology on the mechanical behavior of granular soils
Investigation of soil instability under unconventional stress paths

All Publications

Published Papers in International Journals:

Afzali-Nejad A, Lashkari A, Martinez A (2021). Stress-displacement response of sand-geosynthetic interfaces under different volume change boundary conditions. ASCE Journal of Geotechnical and Geoenvironmental Engineering, (in press), DOI: 10.1061/(ASCE)GT.1943-5606.0002544.
Nourouzi N, Lashkari A (2021). An anisotropic critical state plasticity model with stress ratio-dependent fabric tensor. Iranian Journal of Science and Technology, Transaction of Civil Engineering, (in press) doi.org/10.1007/s40996-020-00448-z
Lashkari A, Jamali V (2021). Global and local sand-geosynthetic interface behavior. Géotechnique, 71(4): 346-367.
Salimi MJ, Lashkari A (2020). Undrained true triaxial response of initially anisotropic particulate assemblies using CFM-DEM. Computers and Geotechnics, 124: 103509.
Lashkari A, Falsafizadeh SR, Shourijeh PT, Alipour MJ, (2020). Instability of loose sand in constant volume direct simple shear tests in relation to particle shape. Acta Geotechnica, 15: 2507-2527.
Abbasi H, Binesh SM, Lashkari A (2019). Using a state-dependent constitutive model in strain wedge method for laterally loaded piles in sand. Soils and Foundations, 59: 271-283.
Lashkari A, Khodadadi M, Binesh SM, Rahman MdM (2019). Instability of particulate assemblies under constant shear drained stress path: a DEM approach. ASCE International Journal of Geomechanics, 19(6): 04019049.
Alipour MJ, Lashkari A (2018). Sand instability under constant shear drained stress path. International Journal of Solids and Structures, 150: 66-82.
Afzali-Nejad A, Lashkari A, Farhadi B (2018). Role of soil inherent anisotropy in peak friction and maximum dilation angles of sand-geosynthetic interfaces. Geotecxtiles and Geomembranes, 46: 869-881.
Lashkari A, Yaghtin MS (2018). Sand flow liquefaction instability under shear-volume coupled strain paths. Géotechnique, 68(11): 1002-1024.
Memarzadeh I, Lashkari A, Shourijeh PT (2018). Consolidation behavior of structured clayey soils: a case study of Shiraz fine alluvial strata. International Journal of Civil Engineering, 16: 1435-1444.
Lashkari A, Karimi A, Fakharian A, Kaviani Hamedani F. (2017). Prediction of undrained behavior of isotropic and anisotropically consolidated Firoozkuh sand: instability and flow liquefaction. ASCE International Journal of Geomechanics, 17(10): 04017082, DOI: 10.1061/(ASCE)GM.1943-5622.0000958.
Lashkari A (2017). A simple critical state interface model and its application in prediction of shaft resistance of non-displacement piles in sand. Computers and Geotechnics, 88: 95-110.
Farhadi B, Lashkari A (2017). Influence of soil inherent anisotropy on the behavior of crushed sand-steel interfaces. Soils and Foundations, 57: 111-125.
Afzali-Nejad A, Lashkari A, Shourijeh PT (2017). Influence of particle shape on the shear strength and dilation of sand-woven geotextile interfaces. Geotextiles and Geomembranes, 45(1): 54-66.
Saberi M, Annan C-D, Konrad J-M, Lashkari A (2016). A critical state two-surface plasticity model for gravelly soil-structure interfaces under monotonic and cyclic loading. Computers and Geotechnics, 80: 71-82.
Lashkari A (2016). Prediction of flow liquefaction instability of clean and silty sands. Acta Geotechnica, 11(5): 987-1014.
Lashkari A, Karimi M (2016). A DEM study on the critical state of granular soils and a unified constitutive model for clean and silty sands. Bulletin of Earthquake Science and Engineering, 2(4): 27-45.
Farahmand K, Lashkari A, Ghalandarzadeh A (2016). Firoozkuh sand: introduction of a benchmark for geomechanical studies. Iranian Journal of Science and Technology, Transaction C (Civil Eng.), 40(C2): 133-148.
Lashkari A, Torkanlou E (2016). On the constitutive modeling of partially saturated interfaces. Computers and Geotechnics, 74: 222-233.
Lashkari A, Kadivar M (2016). A constitutive model for unsaturated soil-structure interfaces. International Journal for Numerical and Analytical Methods in Geomechanics. 40(2): 207-234.
Farhadi B, Lashkari A (2015). Influence of roughness on shear strength and volume change response of sand-steel interfaces. Journal of Experimental Research in Civil Engineering, 2(1): 35-45.
Vahidi-Nia F, Lashkari A, Binesh SM (2015). An insight into the participation of coarse and fine constituents in the mechanical behavior of binary granular soils. Particuology, 21: 82-89.
Lashkari A, Mahboubi M (2015). Use of hyper-elasticity in anisotropic clay plasticity. Scientia Iranica, 22(5): 1643-1660.
Lashkari A (2014). A modified constitutive model for silty sands. Sharif Journal (Civil Engineering), No. 30-2, No. 3: 3-13.
Golchin A, Lashkari A (2014). A critical state sand model with elastic-plastic coupling. International Journal of Solids and Structures, 51 (15-16): 2807-2825.
Lashkari A (2014). Recommendations for extension and re-calibration of an existing sand constitutive model taking into account varying non-plastic fines content. Soil Dynamics and Earthquake Engineering, 61-62: 212-238.
Lashkari A, Golchin A (2014). On the influence of elastic-plastic coupling on sands response. Computers and Geotechnics, 55: 352-364.
Lashkari A (2013). Prediction of the shaft resistance of non-displacement piles in sand. International Journal for Numerical and Analytical Methods in Geomechanics, 37: 904-931.
Lashkari A (2012). A critical state model for saturated and unsaturated interfaces. Scientia Iranica, Transaction A: Civil Engineering, 19(5): 1147-1156.
Lashkari A (2012). A plasticity model for sand-structure interfaces. Journal of Central South University of Technology, 19: 1098-1108.
Lashkari A (2011). Influence of anisotropic elasticity on improvement of liquefaction predictions: a multiaxial approach. Journal of Seismology and Earthquake Engineering, 13(3-4): 149-166.
Lashkari A, Rahnema H (2011). Modeling of initial intense contraction in sand structure interfaces. Iranian Journal of Science and Technology (IJST), Transaction on Civil and Environmental Engineering. 35(C2): 263-269.
Lashkari A (2011). A SANISAND-Structure interface model. Iranian Journal of Science and Technology (IJST), Transaction on Civil and Environmental Engineering. 35(C1): 15-34.
Lashkari A (2010). A SANISAND model with anisotropic elasticity. Soil Dynamics and Earthquake Engineering. 30 (12): 1462-1477.
Lashkari A (2010). Modeling of sand-structure interfaces under rotational shear. Mechanics Research Communications. 37 (1): 32-37.
Lashkari A (2009). On the modeling of the state dependency of granular soils. Computers and Geotechnics. 36 (7): 1237-1245.
Lashkari A (2009). A constitutive model for sand liquefaction under rotational shear. Iranian Journal of Science and Technology, Transaction B, Engineering. 33 (B1): 31-48.
Lashkari A, Latifi M (2009). A constitutive model for sand liquefaction under continuous rotation of principal stress axes. Mechanics Research Communications. 36(2): 215-223.
Lashkari A, Latifi M (2008). Modeling of inherent anisotropy in granular soils using a bounding surface constitutive model. International Journal of Engineering Sciences (Iran University of Science and Technology), 19(8): 55-63.
Lashkari A, Latifi M (2008). Effect of state parameter on improvement of shear band prediction in granular soils. Journal of Faculty of Engineering (Tehran University). 42(6): 763-771.
Lashkari A, Latifi M (2008). A non-coaxial constitutive model for sand deformation under rotation of principal stress axes. International Journal for Numerical and analytical Methods in Geomechanics. 32(9): 1051-1086.
Lashkari A, Latifi M (2007). A simple plasticity model for non-coaxial flow of sand. Mechanics Research Communications. 34(2): 191-200.
Latifi M, Lashkari A (2004). Effect of state parameter on improvement of elastoplastic sand models. Journal of Faculty of Engineering (Tehran University). 38(2): 269-280.

Reviewer for International Journals:

Géotechnique
Acta Geotechnica
Geotextiles and Geomembranes
ASCE Journal of Material in Civil Engineering
ASCE Journal of Engineering Mechanics
ASCE International Journal of Geomechanics
Soil Dynamics and Earthquake Engineering
ASTM Geotechnical Testing Journal
International Journal of Solids and Structures
Powder Technology
Canadian Geotechnical Journal
International Journal for Numerical and Analytical Methods in Geomechanics
Iranian Journal of Science and Technology
International Journal of Civil Engineering
Journal of Seismology and Earthquake Engineering
Computers and Geotechnics