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, 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
Zheng Wan, Chenchen Song, Wensheng Gao
Summary: The DPUH model is a unified hardening model that considers the initial density, confining pressure dependent characteristics, and stress-induced anisotropy of geotechnical materials. It uses 11 material parameters and can accurately predict the stress-strain relationship of sand under various loading conditions.
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2021)
Article
Engineering, Geological
ZengChun Sun, Jian Chu, Yang Xiao
Summary: Researchers have successfully described the mechanical behavior of sand-fines mixtures by developing a novel elastoplastic constitutive model, and verified the accuracy and efficiency of the model by using Runge-Kutta schemes.
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2021)
Article
Engineering, Ocean
Shengjie Rui, Zhen Guo, Lizhong Wang, Hua Yang, Wenjie Zhou
Summary: This study investigated the cyclic interaction between anchor chain and sand, and found that cyclic amplitude, confining stress, chain diameter, sand particle size, and relative density have significant influences on this interaction. The axial resistance gradually stabilizes when cyclic displacement is less than half of the chain diameter, but increases due to particle breakage when it is larger. The appearance of a small constant axial resistance adjustment plateau in the chain-sand cyclic interaction curve can be explained by stress release behind the chain link caused by soil arching effect.
APPLIED OCEAN RESEARCH
(2021)
Article
Environmental Sciences
Kuang-Tsung Chang, Kevin Zeh-Zon Lee, Po-Tsun Yeh, Chia-Ming Chang, Jin-Yi Yu
Summary: The study evaluated the influence of stress state on the creep behavior of an artificial cemented sand resembling soft rocks, and found that the accumulation of creep strain leads to a decrease in post-creep strength. Creep strain and steady-state strain rate increase with increasing mean stress and stress ratio. Additionally, the time to creep failure decreases with decreasing mean stress and increasing stress ratio.
ENVIRONMENTAL EARTH SCIENCES
(2021)
Article
Engineering, Geological
Cheng Chen, Yong Wang, Xianwei Zhang, Lingwei Kong, Guofang Xu
Summary: A numerical model for the mechanical behaviour of gassy sand is presented in this paper, combining the theory of two-phase saturated porous media and an advanced constitutive model for sand to capture the complex stress-strain behaviour. The model is validated by comparing simulated results with laboratory test data.
Article
Engineering, Geological
Ling-Yu Xu, Fei Cai, Wei-Yun Chen, Jing-Zhe Zhang, Dong-Dong Pan, Qi Wu, Guo-Xing Chen
Summary: This study improved the capability of simulating the cyclic mobility behavior of sandy soils through a series of tests, and determined the influence of fines on the liquefaction resistance of sandy soils. A correlation was found between cyclic resistance ratio and the initial value of the equivalent granular state parameter for various fines contents and mean grain sizes.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2021)
Article
Engineering, Geological
Rui Chen, Hai Chen, Zhipeng Kang, Weixing Bao
Summary: This study presents a novel method of using geopolymer and fines to stabilize aeolian sand (AS). Experimental results show that adding fines can increase the cyclic loading capacity but also increase the accumulated axial strain of the mixture. The inclusion of geopolymer greatly enhances the cyclic loading capacity and reduces the accumulated axial strain. The microcharacterization using scanning electron microscope reveals that the added fines alter the microstructure of AS by filling voids and acting as a lubricant, while the added geopolymer induces a chemical fabric in the treated soils leading to increased stabilizing effect.
Article
Engineering, Marine
Ying Liu, Zhixuan Liang, Zhiyong Liu, Guiping Nie
Summary: Drained cyclic and post-cyclic monotonic triaxial tests were conducted on Fujian sand to investigate the effects of cyclic loading on drained strength, stress-dilatancy behavior, and fabric of the sand.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Geological
X. D. Pan, J. Q. Chen, K. Pan, X. Xu, J. W. Jiang, Z. X. Yang
Summary: This paper presents an experimental study on the cyclic flow and liquefaction behavior of anisotropically consolidated sand with fines. The results show that the consolidation method can affect the soil's resistance to cyclic failure, and the addition of fines can inhibit the cyclic flow deformation of the soil mixture.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2021)
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
Chemistry, Multidisciplinary
Darn-Horng Hsiao, Chung-Chieh Lin
Summary: To investigate the effects of plastic fines properties on pore water pressure generation during cyclic loadings, 29 sets of test data from literature and another 21 reconstituted specimens were used. Results showed that clean sands had slow, stagnated, then accelerated pore water pressure ratios until initial liquefaction, while plastic soils with a plastic index greater than 5 had sharp increase in initial stage. Furthermore, cyclic stress ratio of specimens containing plastic fines increased by 1.5-3.0 times more than non-plastic fines. Results were analyzed using a mathematical model, which clarified previous arguments.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Geological
Xiaoli Wang, Chengshun Xu, Ke Liang, Kamran Iqbal
Summary: A series of numerical tests using the discrete element method (DEM) software PFC3D were performed to gain a deeper understanding of the intrinsic properties and correlations of macro mechanical responses in granular materials. The tests revealed the fundamental characteristics of internal forces and deformations, including critical states, large flow deformations, strain softening, and strain hardening. These findings serve as a reference for studying soil dilatancy and modifying constitutive models.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2024)
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
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, 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)
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
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)
Article
Construction & Building Technology
H. Momotaz, M. M. Rahman, M. R. Karim, Y. Zhuge, X. Ma, P. Levett
Summary: Kerbs play a crucial role in road support, and considering multiple factors like flexural strength, impact resistance, and water absorption is necessary, in addition to compressive strength. Research has focused on using recycled materials, such as recycled concrete aggregate (RCA) and tyre-derived aggregate (TDA), as a sustainable alternative to traditional concrete. In this study, ten different concrete mixes were tested for mechanical and durability properties, and significant variations were observed despite similar compressive strength. The use of TDA improved certain properties, like flexural strength and abrasion resistance, but had drawbacks in impact resistance and shrinkage compared to control concrete.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Yachong Xu, Md. Rajibul Karim, Martin Freney, Md. Mizanur Rahman, Reza Hassanli, Yan Zhuge
Summary: This study investigates the performance of tyre-encased soil elements (TESEs) subjected to axial compressive loads. The mechanical properties of TESEs are influenced by soil density, but not highly sensitive to soil type and moisture content. The results can be used for designing and analyzing the performance of tyre encased soil and tyre walls.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2023)
Editorial Material
Engineering, Geological
Md Mizanur Rahman, Dominic E. L. Ong
GEOTECHNICAL RESEARCH
(2023)
Review
Engineering, Civil
Mehdi Javadi, Reza Hassanli, Md Mizanur Rahman, Md Rajibul Karim
Summary: The application of unbonded post-tensioning in structural walls has led to the development of advanced self-centring shear wall systems with significant advantages. However, there are currently no well-established design guidelines available. This research aims to understand the behavior of self-centring wall systems and provide benchmarks for design purposes.
FRONTIERS OF STRUCTURAL AND CIVIL ENGINEERING
(2023)