Article
Engineering, Environmental
Abouzar Sadrekarimi
Summary: The addition of surfactants can reduce the surface tension of pore fluid and improve the compressibility and shear strength of clay samples. This study found that the Atterberg limits decreased and plasticity indices decreased as the amount of surfactant in the pore fluid increased. Moreover, the addition of surfactant increased the shear strength and compressibility of the clay samples.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2022)
Article
Engineering, Geological
Houman Soleimani-Fard, Diethard Koenig, Meisam Goudarzy
Summary: This research evaluated the shear strength parameters of fine-grained soils, finding that ductile behavior was more noticeable in samples with lower suctions and higher straw contents. The shear strength significantly increased with an increase in suction, and the shear band inclination was influenced by both suction and straw content.
Article
Engineering, Geological
Xianwei Zhang, Xinyu Liu, Yiqing Xu, Gang Wang, Yubin Ren
Summary: This study investigated the compression and permeability of diatomaceous soils. The results show that the special hollow structure of diatom particles contributes significantly to the high void ratio, compressibility and permeability of these soils. Additionally, the diatom particles have high brittleness and breakage potential, leading to microstructural rearrangement during compression.
Article
Engineering, Geological
Mustapha Abdellaziz, Mourad Karray, Jeudy Betegard, Pascal Locat, Catherine Ledoux, Remi Mompin, Mohamed Chekired
Summary: This study examines the strain rate effect on the behavior of eastern Canada soils through experimental results and literature data analysis. The findings indicate that the undrained shear strength increases proportionally with the strain rate, with approximately 6% -17% increase per log cycle of strain rate. The results also show that the shear modulus increases with the strain rate, especially at large strain amplitudes. Furthermore, the extent of the strain rate effect is found to be correlated with the shear strain amplitude and plasticity index.
CANADIAN GEOTECHNICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Jeffrey A. Priest, Jocelyn L. Hayley, Jiechun Wu
Summary: Gas hydrate-filled fractures and veins in fine-grained deep water marine sediments can affect sediment strength and consolidation, potentially leading to slope failures. Experimental results showed that the strength and stiffness of hydrate-bearing specimens increased with vein diameter and confining stress, with the impact of confining stresses reducing for larger diameter veins.
EARTH AND SPACE SCIENCE
(2021)
Article
Engineering, Geological
Zhiqiang Lin, Jiangu Qian, Zhenhao Shi, Qian Zhai
Summary: This study examines the uniqueness of strength parameters for coarse- and fine-grained unsaturated soils with bimodal soil-water retention curves (SWRCs) using the suction stress concept. The results show that both types of soils exhibit a bilinear strength envelope in the suction stress-shear strength plane, which differs from unsaturated soils with unimodal SWRC.
ENGINEERING GEOLOGY
(2022)
Article
Engineering, Environmental
S. Bulolo, E. C. Leong, R. Kizza
Summary: The study discusses the effects of drying and wetting cycles on soil, particularly in relation to crack formation and tensile strength. Existing tensile strength models for unsaturated soils were found to have limitations, leading to the proposal of a new model that can be applied to both coarse-grained and fine-grained soils. The new model was shown to outperform existing models in terms of performance.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2021)
Article
Engineering, Geological
Volkan Dagar, Erdal Cokca
Summary: The experimental study measured the tensile strength of compacted clay soil using 8-shaped direct tensile test, split tensile test, and unconfined compression test with various stabilizing agents. Through data correlation, universal equations were developed to estimate the tensile strength of fine-grained soils from their index properties. The ratios of 8-shaped tensile strength to split tensile strength and unconfined compressive strength were found to be 1.9 and 0.4, respectively, while the ratio of split tensile strength to unconfined compressive strength was 0.2.
GEOTECHNICAL AND GEOLOGICAL ENGINEERING
(2021)
Article
Engineering, Mechanical
Kristian Krabbenhoft
Summary: The new total stress failure criterion takes into account both isotropic and anisotropic soils under undrained conditions, and has been validated with reported data from various types of tests.
JOURNAL OF ENGINEERING MECHANICS
(2021)
Article
Engineering, Geological
Regis Mpawenayo, Pierre Gerard
Summary: This study aims to investigate the adequacy of microstructurally-based effective stress in predicting the unsaturated shear strength of remolded fine-grained soils. The experimental data suggests that the microstructurally-based effective stress expressions provide better predictions of the unsaturated shear strength, especially at high suctions. Additionally, the use of microstructurally-based effective stress is particularly relevant for remolded fine-grained soils compacted at high dry densities.
CANADIAN GEOTECHNICAL JOURNAL
(2023)
Article
Engineering, Ocean
Qi Wu, Enci Zhu, Hao Li, Yuanxi Li, Huaan Wang, Guoxing Chen
Summary: In this study, the undrained shear strength Su of undisturbed marine soil was evaluated using piezocone penetration tests (CPTu) and consolidated undrained triaxial tests. The results showed that the Eslami-Fellenius and Chinese soil classification methods based on CPTu data were more applicable for marine soils. The study also proposed a method to determine Su simply by measuring the pore pressure behind the cone (u2), the corrected cone tip resistance (qt), and the soil depth H, which was found to be significantly more precise than existing empirical formulas. This method provides a reliable basis for designing marine engineering and infrastructure projects in different sea regions.
APPLIED OCEAN RESEARCH
(2023)
Article
Engineering, Geological
Pin Zhang, Zhen-Yu Yin, Yin-Fu Jin
Summary: This study proposes a modeling strategy for developing prediction models for soil properties in geotechnical engineering using the Bayesian neural network (BNN) with a strong non-linear fining capability and uncertainty. The results show that BNN can accurately predict compression index and undrained shear strength, but its reliability is low in sparse datasets. Additionally, a novel parametric analysis method is proposed to capture the relationship between input parameters and soil properties.
CANADIAN GEOTECHNICAL JOURNAL
(2022)
Article
Engineering, Geological
Suman Roy, Sathiyamoorthy Rajesh
Summary: In this study, a novel tensile strength framework is proposed to determine the tensile strength characteristic curve (TSCC) of both coarse- and fine-grained soils over the entire saturation range. The variation of the parameters for the TSCC model for different types of soils, testing methods, and sample preparation methodologies is critically assessed. The proposed framework is validated with experimental data sets for both coarse- and fine-grained soils, showing good agreement in most cases.
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2023)
Article
Engineering, Environmental
Seyed Hassan Jafari, Seyed Hamid Lajevardi
Summary: This study investigates the effect of freeze-thaw cycles on the strength and stiffness properties of clay soil stabilized with nanosilica and lime. The results show that adding nanosilica and lime can improve the strength and small strain shear modulus of the clay, but freeze-thaw cycles lead to a reduction in these properties.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2022)
Article
Engineering, Geological
Merita Tafili, Carlos Grandas, Theodoros Triantafyllidis, Torsten Wichtmann
Summary: This paper proposes a model that combines the frameworks of elastoplasticity and hypoplasticity, which successfully reproduces the eight-shaped stress hysteresis under cyclic loading. The model introduces a historiotropic surface and a hypoplastic strain rate.
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2022)
Article
Construction & Building Technology
Foad Changizi, Hasan Ghasemzadeh, Shervin Ahmadi
Summary: The study found that adding nano-SiO2 can improve and prevent the resistance reduction of clay during freeze-thaw cycles. After 9 cycles, the unconfined compressive strength and shear strength of clay treated with 1.0% nano-SiO2 increased by 16% and 21% respectively compared to natural clay without freeze-thaw cycles. Scanning electron microscopy images show that nano-SiO2 produces whiskers under thermal stresses caused by freeze-thaw cycles, leading to a significant increase in clay's mechanical properties by creating filamentary networks.
ROAD MATERIALS AND PAVEMENT DESIGN
(2022)
Article
Environmental Sciences
Mohammad Reza Sabour, Ehsan Asheghian Amiri, Mohammadamin Akbari, Amin Sadeghi-Sheshdeh
Summary: The study on the life cycle assessment of concrete and mortar has become increasingly important in recent years, with a focus on reducing their environmental impacts. Through bibliometric analysis, it was found that the number of studies in this field has grown significantly, with engineering and environmental science being the main areas. The USA is recognized as the leading country in terms of productivity, while J. de Brito from Portugal is the most prolific author. Fly Ash is the most frequently occurring keyword, and research on Recycled Aggregates is also increasing.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Engineering, Environmental
Hamid Ghasemi, Hessam Yazdani
Summary: The construction industry has the potential to address challenges in the built environment by using plastics as a sustainable solution. By using coarse-grained models, existing plastics can be improved and innovative polymers can be developed. We have developed an efficient method to parameterize a coarse-grained force field and demonstrated its application in polyvinyl chloride.
RESOURCES CONSERVATION AND RECYCLING
(2022)
Article
Engineering, Environmental
Bo Liu, Saeed Babaei, Longhui Bai, Shansi Tian, Hasan Ghasemzadeh, Mehrab Rashidi, Mehdi Ostadhassan
Summary: This study investigated the behavior of ethane in graphene layers using simulations and analyzed the absolute adsorption isotherm using adsorption models. The results showed that the current adsorption models cannot accurately predict absolute adsorption, suggesting that adsorbed volume should be favored for estimating absolute adsorption.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Geochemistry & Geophysics
Toktam Zand, Hasan Ghasemzadeh, Ali Gholami, Alison Malcolm
Summary: Reverse time migration (RTM) is a state-of-the-art imaging technique that uses a full wave equation to provide outstanding imaging capabilities. However, the quality of its results can be compromised when the assumptions of the method are not satisfied. In such cases, appropriate regularization is required to mitigate these shortcomings and stabilize the solution.
Article
Acoustics
Mohsen Khatibinia, Sadegh Akbari, Hessam Yazdani, Sadjad Gharehbaghi
Summary: This study presents an approach to designing tuned mass dampers (TMDs) by quantifying seismic damage as a representative of structural response. The design problem is formulated into an optimization framework, where the objective function is to minimize the maximum value of story damage and constraints ensure a uniform distribution of damage along the height of the structure. The approach is demonstrated by finding the optimum design of a TMD for a 10-story inelastic steel moment-resisting frame (SMRF) and showing its effectiveness in mitigating local damage, achieving a more uniform damage distribution, improving the balance of drifts and accelerations, and reducing the seismic fragility of the SMRF.
JOURNAL OF VIBRATION AND CONTROL
(2023)
Article
Environmental Sciences
Farideh Pahlavan, Hamid Ghasemi, Hessam Yazdani, Elham H. Fini
Summary: Soil-based filter media in green infrastructure are not efficient in buffering deicing salt in surface water, but biochar amendment has shown to improve the adsorption capacity for sodium and chloride ions. Our study focuses on biochar grafted by nitrogenous functional groups, which demonstrate strong adsorption of chloride ions and delay chloride diffusion, making it a potential dual-targeting strategy to sequestrate carbon and prevent deicing salt contaminants from leaching into water bodies.
Article
Environmental Sciences
Hasan Ghasemzadeh, Mojtaba Ostovar, Farhad Karimi
Summary: Untreated surfactant-rich greywater is discharged into the environment in underdeveloped countries, causing changes in soil characteristics. However, there is limited research on the geotechnical behavior of surfactant-contaminated soils. This study investigated the mechanical properties of contaminated sandy soils and found that the geotechnical properties declined with increasing surfactant concentration in the contaminant.
SOIL & SEDIMENT CONTAMINATION
(2023)
Article
Engineering, Environmental
Saeed Babaei, Hasan Ghasemzadeh, Stephane Tesson
Summary: Accurately predicting gas adsorption in shale gas is crucial for estimating production capacity and optimizing extraction processes. The complex nature of shale reservoirs poses significant challenges in understanding the mechanism of methane adsorption. Through the use of a nanocomposite shale model and hybrid simulations, the study investigates methane adsorption in rigid and flexible shale models under different conditions. The results highlight the influence of factors such as kerogen flexibility, pore width, moisture content, temperature, and pressure on fluid behavior.
CHEMICAL ENGINEERING JOURNAL
(2023)
Review
Energy & Fuels
Mohammadjavad Kazemi, Saghar Parikhah Zarmehr, Hessam Yazdani, Elham Fini
Summary: The applications of end-of-life tires (ELT) for energy recovery and new products can contribute to a circular economy. However, the lack of streamlined handling and recycling processes, poor understanding of long-term ecological and health consequences, and limited techno-economic assessments and life-cycle analyses hinder the widespread application of repurposed ELT.
Article
Environmental Sciences
M. R. Sabour, H. Zarrabi, M. Hajbabaie
Summary: This study examines the research trends and future directions of pharmaceutical life cycle assessment (LCA) through bibliometric indicators. It finds that the utilization of LCA method in the pharmaceutical sector has been increasing, with a focus on pharmaceuticals for human consumption and topics such as green chemistry, energy efficiency, and sustainable pharmacy.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Geological
Hasan Ghasemzadeh, Mohammad Jafarzadeh, Shervin Ahmadi
Summary: This research conducted large-scale tests on geocell-reinforced soils and found that the placement depth and height of geocells have significant effects on soil characteristics. Under static loading conditions, placing geocells at 0.25 times the sample's height from the top surface can effectively control bulging and reduce settlement. Under cyclic loading conditions, placing geocells at 0.05 times the sample's height from the top surface can significantly reduce cumulative strains.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2024)
Article
Engineering, Civil
Hussein Eliasi, Hessam Yazdani, Mohsen Khatibinia, Mehdi Mahmoudi
Summary: The study presents a technique for the optimum design of a sliding mode controller (SMC) for ATMD-equipped structures subjected to earthquakes, and the optimized SMC outperforms PID and LQR, exhibiting performance comparable to that of FLC in reducing displacements.
STRUCTURAL ENGINEERING AND MECHANICS
(2022)
