Article
Construction & Building Technology
Shabir Ahmed, Jayan S. Vinod, M. Neaz Sheikh
Summary: This study presents the potential of scrap tire in controlling the onset of instability of sand. Through a series of tests, the effects of different stress conditions and tire chip content on instability were investigated. The results show that the optimum performance in controlling instability is achieved when the tire chip content is 20%.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2022)
Article
Green & Sustainable Science & Technology
Majd Ahmad, Richard Ray
Summary: The damping ratio values of three different types of sand were measured using the Resonant Column-Torsional Simple Shear device. Three distinct methods were employed to estimate and compare the damping ratio values, and the results showed that the different methods provided accurate measurements under different strain conditions.
Article
Engineering, Geological
Kazem Fakharian, Ali Ahmad
Summary: The study shows that adding granulated rubber decreases shear modulus and increases damping ratio of granulated rubber-sand mixtures, while also helping to reduce the degradation rate of shear modulus. Anisotropic consolidation has little effects on the variations of shear modulus and damping ratio of sand-rubber mixtures.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2021)
Article
Engineering, Geological
Mengtao Wu, Wenhui Tian, Fangcheng Liu, Jun Yang
Summary: This technical note investigates the shear modulus and damping ratio of geocell-reinforced rubber sand mixtures (RSM). The results show that geocell reinforcement can increase the vertical confinement of the system, weaken the anti-S-shaped characteristics of hysteresis loops, and enhance the damping ratio of RSM at large strain amplitudes. The normalized shear modulus degradation curves demonstrate the influence range of geocell reinforcement, suggesting that a rubber content of 20% may be an optimal value for reinforced specimens.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2023)
Article
Engineering, Geological
Sung-Sik Park, Zhen-Zhen Nong, Nhat-Phi Doan
Summary: A proposed elasto-plastic constitutive model takes into account the effect of principal stress rotation and can simulate soil behavior regardless of the value of K-0. After calibration with experimental data, the model is capable of simulating conventional liquefaction effects.
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2022)
Article
Engineering, Civil
Hongxu Jin, Lin Zhou, Lin Guo, Junhao Tong
Summary: This study conducted a comparative analysis on the behavior of calcareous sand and siliceous sand through a series of simple shear tests. It was found that calcareous sand exhibited higher peak strengths and liquefaction resistance compared to siliceous sand.
JOURNAL OF EARTHQUAKE ENGINEERING
(2023)
Article
Engineering, Geological
Wonjun Cha, Junghee Park, J. Carlos Santamarina
Summary: This study investigates the volumetric and shear response of uniform quarzitic sand under repetitive drained simple shear loading. The effects of initial density, initial shear stress, and cyclic shear stress amplitude are explored to identify criteria for predicting asymptotic volumetric and shear states. The results provide guidelines for first-order engineering analyses of sands subjected to repetitive shear loading.
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING
(2023)
Article
Construction & Building Technology
Kangle Zuo, Xiaoqiang Gu, Chao Hu, Jing Hu, Guangyun Gao
Summary: In this study, the effects of fines content (FC) and sand gradation on small strain shear modulus G0 in sand-fines mixtures were investigated. The results showed that G0 continuously decreased as FC increased, reaching nearly 50% of clean sand at the highest FC. The stress dependence of G0 was found to be insensitive to FC. A new predictive model was proposed to evaluate G0, taking into account the effects of void ratio, confining pressure, FC, and sand gradation.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Geological
Md Mizanur Rahman, Yannis F. Dafalias
Summary: This study discusses the effects of fabric anisotropy and fines content on the mechanical behavior of sands, and develops the Anisotropic Critical State Theory and Equivalent Granular State Theory for clean sands. By combining these two theories, a constitutive model is proposed to simultaneously consider the effects of fabric anisotropy and fines content on the undrained response of sands.
Article
Engineering, Civil
Nima Mojtahedzadeh, Abbas Ghalandarzadeh, Ramin Motamed
Summary: The main focus of the research is to obtain the dynamic properties of Firouzkooh sand, including shear modulus and damping ratio, and study how factors like specimen fabric and consolidation anisotropy affect these parameters. Results show that these factors have an impact on the dynamic properties of the sand.
INTERNATIONAL JOURNAL OF CIVIL ENGINEERING
(2022)
Article
Mechanics
Sergey G. Mironov, Vladimir M. Aniskin, Anatoly A. Maslov
Summary: Experimental study on the behavior of a supersonic air jet in various ambient gases reveals that the density of the ambient medium affects the supersonic core length of the jet. The change in ambient medium density influences the conditions for global instability of the underexpanded air jet and the generation of the screech tone.
Article
Engineering, Geological
Daniela Dominica Porcino, Theodoros Triantafyllidis, Torsten Wichtmann, Giuseppe Tomasello
Summary: This study conducted experimental research on the undrained static and cyclic strength of sand with non-plastic fines, and found that psi* can effectively characterize and model the static and cyclic behavior of tested soils.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2022)
Article
Engineering, Geological
A. Lashkari, S. R. Falsafizadeh, Md M. Rahman
Summary: This paper investigates the impact of volume change boundary conditions on the instability and post-peak softening of sand, revealing that volumetric expansion intensifies instability susceptibility while volumetric contraction reduces vulnerability. Experimental data analysis using Hill's second-order work criterion predicts relational trends for instability lines, normalized peak shear strengths, and maximum pore-water pressure ratios depending on the coupling between volumetric and shear strain rates. A simple state-dependent constitutive model is found to accurately predict relational trends in sand specimens experiencing instability and post-peak softening under different degrees of linear coupling between volumetric and shear strains.
Article
Engineering, Geological
Riccardo Fanni, David Reid, Andy Fourie
Summary: The study investigates the shearing behavior of reconstituted sand under torsional shear hollow cylinder (TSHC) tests and finds that cross-anisotropy strongly influences the sand's shearing behavior. Ignoring the effect of cross-anisotropy leads to unconservative slope stability assessments.
Article
Engineering, Marine
Qin You, Weijia Ma, Shuanglan Wu, Qi Wu, Zhang Lei, Guoxing Chen
Summary: Marine coral sand exhibits shear shrinkage and expansion under monotonic loading, and its stress-strain response is influenced by the initial orientation angle and the loading direction angle. The phase-transition strength and internal friction angle of the coral sand vary with the loading direction. There is a linear relationship between the phase-transition strength and a dimensionless parameter that varies with the orientation angles.
Article
Engineering, Geological
Isaac Ahenkorah, Md Mizanur Rahman, Md Rajibul Karim, Simon Beecham
Summary: Microbial-induced carbonate precipitation (MICP) and enzyme-induced carbonate precipitation (EICP) are two bio-cementation techniques for ground improvement. This study investigated the behaviors of MICP and EICP treated sand specimens under wetting-drying, freezing-thawing, and elevated temperature conditions. The results showed that EICP treated specimens had lower resistance to wetting-drying and freezing-thawing cycles due to the presence of unbonded or loosely bonded CaCO3. High temperatures led to significant mass loss and reduction in CaCO3 content. A multi-objective evolutionary genetic algorithm (GA) was used to predict the unconfined compressive strength (UCS) of the specimens.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2023)
Article
Engineering, Environmental
Yi-Xin Xie, Wen-Chieh Cheng, Lin Wang, Zhong-Fei Xue, Md Mizanur Rahman, Wenle Hu
Summary: Biomineralization has been widely used as an environmentally-friendly method in remediating copper-contaminated sites. However, immobilizing copper without inactivating ureolytic bacteria is challenging. This study investigated the relationship between copper immobilization efficiency and pH conditions through test tube experiments and numerical simulations. Additionally, soil column tests, along with X-ray diffraction and Raman spectroscopy analysis, were conducted to explore the mechanisms affecting copper immobilization efficiency. The findings suggest the potential of using microbial-induced carbonate precipitation technology for remediating copper-rich water bodies and contaminated sites.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Engineering, Geological
Rohini Kolapalli, Md Mizanur Rahman, Md Rajibul Karim, Hoang Bao Khoi Nguyen
Summary: Cyclic liquefaction failure modes are directly related to the consequence of liquefaction and important for mitigation strategies. Two common failure modes, cyclic mobility (CM) and cyclic instability (CI), are well reported in the literature. However, recent experimental studies revealed three other failure modes, i.e. plastic strain accumulation (PSA) and two hybrid failures: CI followed by CM and CI followed by PSA.
Article
Engineering, Civil
Yachong Xu, Yan Zhuge, Md. Rajibul Karim, Reza Hassanli, Md. Mizanur Rahman, Martin Freney
Summary: This paper used a combined finite and discrete element method to investigate the structural performance of tyre walls built with tyre-encased-soil elements. The numerical model was verified against experimental results, providing a deeper understanding of the tyre wall behavior. The results encourage the adoption of tyre walls in low-rise building constructions, solving tyre recycling/storage issues and promoting sustainable construction practices.
ENGINEERING STRUCTURES
(2023)
Article
Engineering, Geological
Mohammad Emdadul Karim, Md. Mizanur Rahman, Md. Rajibul Karim, Andy B. Fourie, David Reid
Summary: This study characterized the behavior of a tailings material from a copper tailings storage facility in Canada using the critical state soil mechanics framework. Different shearing tests were conducted in direct simple shear space to investigate the correlation between a modified state parameter (psi m) and instability state as well as flow potential. The study also focused on the differences in behavior compared to natural granular soils.
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING
(2023)
Article
Biotechnology & Applied Microbiology
Lin Wang, Wen-Chieh Cheng, Zhong-Fei Xue, Md Mizanur Rahman, Yi-Xin Xie, Wenle Hu
Summary: Inappropriate irrigation can lead to migration of heavy metals into surrounding environments, posing a serious threat to the human central nervous system. Microbial-induced carbonate precipitation (MICP) and enzyme-induced carbonate precipitate (EICP) have been proposed as alternatives to traditional site remediation technologies. This study compared the remediation performance of lead (Pb) and copper (Cu) using MICP and EICP respectively, and investigated the factors affecting the remediation efficiency. Results showed that MICP had higher ammonium ion (NH4 (+)) concentration than EICP, and the remediation efficiency against Cu2+ was approximately zero. The reduction in remediation efficiency against Pb2+ and Cu2+ was attributed to the precipitations of cotunnite and atacamite respectively.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2023)
Editorial Material
Engineering, Geological
Dominic E. L. Ong, Md Mizanur Rahman
GEOTECHNICAL RESEARCH
(2023)
Article
Construction & Building Technology
H. B. K. Nguyen, M. M. Rahman, M. R. Karim
Summary: Soil is naturally heterogeneous, especially for silty and clayey soils, and this variation is often overlooked in previous studies. Considering the variability of soil parameters is important for evaluating the failure potential of geo-structures like slopes and retaining walls. This study used a 2D random finite element method to analyze the effect of soil variability on slope stability and found that higher variability in the soil increased the chances of failure, while higher spatial correlation length decreased the potential of failure. Anisotropy in soil properties was also considered and it was found that anisotropic soil had significantly higher failure probability compared to isotropic soil.
FRONTIERS IN BUILT ENVIRONMENT
(2023)
Article
Green & Sustainable Science & Technology
Christopher W. K. Chow, Raufdeen Rameezdeen, George Y. Y. Chen, Haolan Xu, Md Mizanur Rahman, Xing Ma, Zhuge Yan, Nima Gorjian, Jing Gao
Summary: Moisture ingress in concrete reduces durability and life span of water assets. Accurate condition information is difficult to obtain when inspection points are physically inaccessible. Therefore, a reliable and cost-effective real-time monitoring system would be useful, particularly for water utilities.
WATER CONSERVATION SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Geological
R. Kolapalli, M. M. Rahman, M. R. Karim, H. B. K. Nguyen
Summary: A granular soil can undergo liquefaction failure due to excess pore water pressure (Au) generation during cyclic loading like earthquakes. This study investigates the factors affecting Au generation under both symmetric and nonsymmetric cyclic loading conditions using the discrete element method (DEM). It also evaluates the performance of existing Au generation models in predicting Au development. The results show that CSR influences Au generation under symmetric loading, while both CSR and SSR affect Au generation under nonsymmetric loading. A new prediction model for Au generation is developed and shows good agreement with DEM simulation results.
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING
(2023)
Article
Engineering, Civil
Ali Lashkari, Piltan Tabatabaie Shourijeh, Iman Memarzadeh, Md. Mizanur Rahman
Summary: The intrinsic parameters derived from laboratory tests on completely reconstituted specimens are widely used for interpreting the mechanical behavior of natural clay soils. This study investigates the one-dimensional compression behavior of fully reconstituted specimens of Shiraz clay soil under different initial water content and effective vertical stress conditions. The findings indicate that the intrinsic compression index, void ratio at 100 and 1000 kPa effective vertical stress, and void ratio at suction pressure increase with initial water content, while suction pressure decreases. Void index and liquidity index have a non-linear relationship depending on initial water content. The undrained shear strength decreases exponentially with liquidity index, and the strength at the plastic limit is 148 times greater than at the liquid limit.
IRANIAN JOURNAL OF SCIENCE AND TECHNOLOGY-TRANSACTIONS OF CIVIL ENGINEERING
(2023)
Article
Geosciences, Multidisciplinary
Shaojie Wen, Wen-Chieh Cheng, Wenle Hu, Md Mizanur Rahman
Summary: Heavy metals in landfill leachate pose serious threats to human health and surrounding environments as they are easily absorbed by soil particles. Mining and metallurgy activities in Northwest China exacerbate these threats. This study aims to enhance our understanding of the relationship between the microstructural evolution of loess soil due to lead contamination and its macro air and liquid permeability properties.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Engineering, Civil
Cameron Hopkins, Donald Cameron, Md Mizanur Rahman
Summary: The polymer additive used in this study is suitable for aggregates with clay-rich fines. It is a proprietary dry powdered polymer (DPP) and was proven to be effective in field trials with poor site drainage and flood risk. The treated road sections showed good performance compared to the adjacent control sections.
TRANSPORTATION GEOTECHNICS
(2023)
Article
Construction & Building Technology
H. Momotaz, M. M. Rahman, M. R. Karim, Y. Zhuge, X. Ma, P. Levett
Summary: This paper investigates the effect of using recycled aggregates on the mechanical and chemical properties of concrete. It is observed that tyre-derived aggregates form weaker bonds with cement paste, and the interfacial transition zone (ITZ) has a considerably lower elastic modulus than cement paste. Many nano-pores are found on the tyre-derived aggregate's surface, which may contribute to inferior performance compared to conventional concrete. The study also suggests that reducing the water-binder ratio may improve the mechanical behavior of cement paste by reducing the number of nano-pores.
JOURNAL OF BUILDING ENGINEERING
(2023)
Editorial Material
Engineering, Geological
Md Mizanur Rahman, Dominic E. L. Ong
GEOTECHNICAL RESEARCH
(2023)
