Article
Construction & Building Technology
Alireza Moslemi, Alireza Tabarsa, Seyed Yasin Mousavi, Mohammad Hadi Aryaie Monfared
Summary: The study investigates the effects of lignocellulosic fibers on the geotechnical properties of soils. The results show that specimens reinforced with 1% fibers exhibit the highest ultimate deviatoric stress and lowest pore water pressure. Longer fibers enhance the strength and pore water pressure, while pure cellulose fibers are more effective in improving shear strength. Moreover, curing time also affects the strength and pore water pressure of the soil.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Elena Bragar, Yakov Pronozin, Askar Zhussupbekov, Alexander Gerber, Assel Sarsembayeva, Tymarkul Muzdybayeva, Ulbossyn Zhangabilkyzy Sarabekova
Summary: The number of freezing-thawing cycles has a significant effect on the strength characteristics of soils, with cohesion largely depending on parameters such as void ratio, initial moisture content, and the number of cycles. The angle of internal friction shows an indefinite behavior during freeze-thaw cycles. These changes have a significant impact on the soil's bearing capacity.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Marine
Yuan Gao, Jisheng Zhang, Linlong Tong, Yakun Guo, Dennis Lam
Summary: Most previous studies focused on wave-induced pore pressure in sandy seabed liquefaction, while this study investigates the phenomenon in silty seabed. Experimental results show that residual pore pressure is the dominant factor causing liquefaction in silty soil. Buried pipelines experience liquefaction starting at the bottom and propagating vertically. The liquefaction potential is reduced when the pipeline is placed in a trench and backfilled.
Article
Engineering, Ocean
Xuguang Chen, Fengpeng Zhang, Xixi Liu, Hui Li, Xian Zhang, Qiang Wei, Lizhen Wang, Hanfeng Tang, Jiakang Wei, Kehu Li
Summary: This study reproduces the evolution process of consolidated silt in a silty seabed under waves through flume experiments, focusing on the response of pore water pressure, soil strength variation, and changes in soil particle characteristics. The findings suggest that the silty seabed undergoes two stages, failure and reconsolidation, ultimately forming a high-strength consolidated silt layer.
APPLIED OCEAN RESEARCH
(2022)
Article
Engineering, Marine
Qixiang Wang, Yupeng Ren, Ruichen Cao, Guohui Xu, Xianqing Lv
Summary: This study uses the MIT General Circulation Model (MITgcm) to simulate the pressure of liquefied soil during the initial stage of liquefaction in the Chengdao area of the Yellow River delta. Unlike previous studies, this research employs 32 linear waves as driving factors, which better represents actual wave conditions. By accurately reflecting pressure characteristics induced by wave groups, the study highlights the importance of physical factors in simulation accuracy and reliability. The findings provide valuable information for offshore engineers and researchers of soil liquefaction.
Review
Engineering, Chemical
Akbar Samadi, Tianlong Ni, Enrica Fontananova, Gang Tang, Hokyong Shon, Shuaifei Zhao
Summary: Membrane distillation (MD) is a promising membrane separation technology for desalination, wastewater treatment, and resource recovery. However, its performance is often limited by the wetting of hydrophobic membranes, resulting in reduced flux and efficiency. To overcome this challenge, the development of antiwetting hydrophobic MD membranes has gained attention, and this review explores the liquid entry pressure and strategies for engineering antiwetting surfaces.
Article
Engineering, Geological
Mahta Movasat, Ingrid Tomac
Summary: This study examines the properties of laboratory-made hydrophobic soils compared to natural hydrophobic soils collected from burned sites to understand and predict postwildfire soil erosion and mudflow mechanisms. The results show that soil water retention curve may be unreliable for assessing the hydraulic properties of burned soils, and flash floods on inclined hydrophobic soil surfaces occur rapidly during rainfall with water entry value linearly related to water drop contact angle.
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING
(2021)
Article
Construction & Building Technology
Jingjing Pan, Boxin Wang, Qing Wang, Xianzhang Ling, Ruichang Fang, Jiaqi Liu, Zihao Wang
Summary: This study investigates the shear characteristics of the concrete-silty clay interface under concrete surface roughness, normal stress, and moisture content using modern friction theory. An adhesion-ploughing friction model is established to predict the shear strength of the interface. The results show that the shear strength of the interface is positively correlated with normal stress and concrete surface roughness, while negatively correlated with moisture content.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Mehmet Ugur Yilmazoglu, Askin Ozocak
Summary: This study conducted experiments on model footings of different types and sizes on saturated silty soil layers with different saturation degrees and void ratio values, and proposed a new equation for characterizing the ultimate bearing capacity (UBC) of shallow foundations on unsaturated silty soils. The UBC of unsaturated soils can be determined based on the results of unconfined compressive strength tests (UC) measured on unsaturated soil samples and based on the degree of saturation and the fitting parameter.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Geological
Yonghong Wang, Songkui Sang, Mingyi Zhang, Xueying Liu, Suchun Yang
Summary: This study analyzed the change of earth pressure at the pile-soil interface caused by the penetration of PHC pipe pile in a construction project in Dongying. The results showed that the earth pressure at different positions caused by the pile penetration gradually increases with time, and the influence of pile jacking on the earth pressure is weak beyond a certain distance from the pile end. The research has engineering guiding significance for construction and bearing capacity determination of jacked pile in viscous soil foundation.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2021)
Article
Agriculture, Multidisciplinary
Wei Huang, Haoqiang Lai, Jiaxin Du, Cuiying Zhou, Zhen Liu, Qian Ni
Summary: The study demonstrates that the application of super absorbent resin can improve the structure and water characteristics of slope surfaces, promote plant growth, and enhance the environmental protection effect.
CHEMICAL AND BIOLOGICAL TECHNOLOGIES IN AGRICULTURE
(2022)
Article
Geosciences, Multidisciplinary
Seyedeh Mehrnoosh Mirbabaei, Mahmoud Shabanpour, Jos van Dam, Coen Ritsema, Aliasghar Zolfaghari, Mohammadreza Khaledian
Summary: Water repellent soils can lead to poor water infiltration and increased runoff, impacting hydrological responses. In a study in northern Iran, water repellency in Pinus teada-covered coarse-textured soil was analyzed using the SWAP model. Results showed extreme repellency during dry conditions and high-intensity rainfall in summer and early autumn, leading to runoff formation. Incorporating water repellency in the model improved agreement with measured data.
Article
Engineering, Geological
You Gao, Ze Li, Wenjie Cui, De'an Sun, Haihao Yu
Summary: The tensile strength of unsaturated soils, particularly fine-grained soils, is an important property in geotechnical designs. Current models for estimating tensile strength might overestimate for fine-grained soils. This study measured the tensile strength of unsaturated lean clay and proposed a predictive model based on the interaction mechanisms between soil water and initial void ratio, which can be used for both coarse-grained and fine-grained unsaturated soils.
Article
Chemistry, Multidisciplinary
Glen McHale, Rodrigo Ledesma-Aguilar, Chiara Neto
Summary: In 1948, Cassie proposed an equation for the wetting of a smooth, heterogeneous surface. This equation uses weighted averages based on the fractional surface areas and cosines of contact angles to predict the contact angle of a droplet on a composite surface. The equation has proven fundamental in understanding the wetting of superhydrophobic and superoleophobic surfaces. However, little attention has been given to the complete wetting of one surface component.
Article
Engineering, Geological
Arash Khosravifar, Stephen Dickenson, Diane Moug
Summary: The results of cyclic strain-controlled, constant volume direct simple shear (CDSS) tests and field shaking tests on low-plastic silts from different soils were evaluated. The CDSS tests showed that excess pore pressure ratios decrease with plasticity index and overconsolidation ratio. The field shaking tests confirmed the cyclic threshold shear strain amplitude as a fundamental soil property. The calibrated model parameters can be used as a benchmark for selecting model parameters for silts.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2022)
Article
Engineering, Geological
Boyoung Yoon, Woojin Lee, Changho Lee, Hyunwook Choo
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING
(2020)
Article
Chemistry, Physical
Hyunwook Choo, Youngmin Choi, Woojin Lee, Changho Lee
Article
Engineering, Civil
Hyunwook Choo, Linh Van Ngo, Taeki Kim, Youngsang Kim, Changho Lee
KSCE JOURNAL OF CIVIL ENGINEERING
(2020)
Article
Chemistry, Multidisciplinary
Van-Linh Ngo, Changho Lee, Jae-Min Kim
Summary: The study found that structures located in layered soils experience changes in response to earthquakes, with an increase in roof motion of tall structures even as free-field motion decreases. This is because the presence of a soft layer alters the system's stiffness, affecting the kinematic and inertial interactions.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Physical
Seongnoh Ahn, Jae-Eun Ryou, Kwangkuk Ahn, Changho Lee, Jun-Dae Lee, Jongwon Jung
Summary: This study compared the cement reinforcement method with the biopolymer reinforcement method using sodium alginate, finding that sodium alginate solution can have a similar reinforcing effect with a smaller amount of additive. However, the reinforcing effect decreases when the viscosity of the sodium alginate solution exceeds a certain value.
Article
Chemistry, Multidisciplinary
Van-Linh Ngo, Changho Lee, Eun-haeng Lee, Jae-Min Kim
Summary: This study utilized a nonlinear kinematic hardening (NKH) model and implemented a semi-automated procedure in MATLAB for fitting backbone curves, resulting in good matches with target curves. The results demonstrate the effectiveness of the procedure and NKH model in simulating the nonlinear properties of ground materials.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Physical
Hyunwook Choo, Junghee Park, Thu Thi Do, Changho Lee
Summary: This study extends the modified Archie's equation to accurately measure the electrical conductivity of various clayey soils. The research found that surface conduction plays a crucial role in determining the electrical conductivity of clayey soils in low pore water conductivity environments. Additionally, there are strong correlations between the clay index properties and the unmeasurable parameters in the modified Archie's equation. The globally extended equation obtained from model validation can be used for estimating the electrical conductivity of in-situ clayey sediments.
APPLIED CLAY SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Hyunwook Choo, Changho Lee
Summary: The study reveals that shear wave velocity (V-s) in binary mixed soils is influenced by the packing density, depending on the size ratio of the small to large particles. When the size ratio is either greater than 0.414 or less than 0.155, V-s increases with packing density, while in the range of 0.155 to 0.414 with a finer fraction below a certain threshold, V-s decreases with increasing packing density.
JOURNAL OF APPLIED GEOPHYSICS
(2021)
Article
Construction & Building Technology
Rodney Ewusi-Wilson, Junghee Park, Boyoung Yoon, Changho Lee
Summary: This study employs geostatistical and artificial intelligence methods to estimate ground improvement after dynamic compaction. Results show that random forest spatial interpolation techniques outperform traditional geostatistical methods, and the artificial neural network model is compatible with physical and intuitive processes related to dynamic compaction. This unique approach is useful for geotechnical engineers when designing site improvement projects, particularly dynamic compaction for coarse-grained soils.
ADVANCES IN CIVIL ENGINEERING
(2022)
Article
Engineering, Civil
Emmanuel Ike, Junghee Park, Changho Lee
Summary: This study investigates the effect of pore fluid chemistry on sedimentation trends and liquid and plastic limits of different clayey soils. Different sedimentation trends are observed at different ion concentrations and pH conditions, and three sedimentation parameters are defined to capture the salient features of clay particles. The relationship between these parameters and the new fines classification chart can be useful to predict sedimentation modes of clays with different pore fluid chemistry.
KSCE JOURNAL OF CIVIL ENGINEERING
(2023)
Article
Chemistry, Physical
Boyoung Yoon, Hyunwook Choo, Changho Lee
Summary: Modern construction projects require innovative materials to improve safety, durability, and functionality. This study synthesized polyurethane on glass beads to enhance soil material functionality and evaluated their mechanical properties.
Article
Engineering, Civil
Hyunwook Choo, Woojin Lee, Changho Lee
Summary: This study evaluated the effect of curing time on the relationship between rho(mix) and UCS of sands grouted with microcement, aiming to estimate UCS over time based on rho(mix). Results show that curing time, particle size, and wc influence both rho(mix) and UCS, establishing a direct relationship between the two. However, the complex impact of curing time on the relation between UCS and rho(mix), as well as the nonlinear increase in UCS with time, presents challenges in capturing the interplay between UCS, rho(mix), and curing time.
GEOMECHANICS AND ENGINEERING
(2021)
Article
Chemistry, Analytical
Jong-Sub Lee, Geunwoo Park, Yong-Hoon Byun, Changho Lee
Article
Engineering, Civil
Hyunwook Choo, Youngmin Choi, Young-Uk Kim, Woojin Lee, Changho Lee
GEOMECHANICS AND ENGINEERING
(2020)
Article
Engineering, Civil
Van-Linh Ngo, Jae-Min Kim, Changho Lee
GEOMECHANICS AND ENGINEERING
(2019)
