Article
Materials Science, Composites
Qiang Fu, Wenrui Xu, Jiaqi He, Li Su, Hao Song, Ditao Niu
Summary: Under dynamic conditions, the strength of BFRCAC increases with the strain rate and confining pressure, with the dynamic H-B strength criterion showing higher calculation accuracy.
COMPOSITES COMMUNICATIONS
(2021)
Article
Engineering, Geological
M. Alidaryan, M. H. Khosravi, M. Bahaaddini, M. Moosavi, H. Roshan
Summary: This study simulated brittle, brittle-ductile, and ductile failure modes in direct shear tests and investigated the mobilization of cohesion and friction angle during the failure process. It was found that an increase in normal stress led to an increase in cohesion but a decrease in friction angle. The Mohr-Coulomb criterion was modified to account for the influence of normal stress and displacement on cohesion and friction angle. The results successfully reproduced the outcomes of direct shear tests and demonstrated the evolution of plastic strain for cohesion and friction angle.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Energy & Fuels
Marc Hettema
Summary: This research focuses on practical assessment of seismic hazard in low-enthalpy geothermal doublet systems, presenting a workflow to determine probability distribution for mechanical re-activation along pre-existing weak faults. Through probabilistic logic tree analysis, uncertainty is addressed and critical criterion and estimation methods are introduced.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2022)
Article
Engineering, Geological
Jinquan Shi, Haoyu Li, Yang Xiao, Jian Hu, Wim Haegeman, Hanlong Liu
Summary: Particle size gradation is crucial for small strain stiffness of sand and can influence biocementation behavior. This study investigated the relationship between small strain shear modulus and particle distribution through isotropic consolidation tests on glass sand with light biocementation. Shear wave velocities were measured in multiple directions using bender elements. Results showed that uncemented sand exhibited a decrease in small strain shear modulus G(0) and an increase in stiffness anisotropy with increasing uniformity coefficient Cu. Biocemented sand showed a gradual disappearance of the G(0) decrement with biocementation level, indicating an increase in G(0) with Cu. The ratio of G(0) between biocemented and uncemented sand experienced four stages. Stiffness anisotropy also changed with biocementation, particularly during unloading stages. The changes in stiffness anisotropy were more pronounced for sands with higher Cu and biocementation level.
Article
Construction & Building Technology
Ali A. Semendary, Adam J. Kriegl, Dagmar Svecova
Summary: This study investigates the bond performance of ultra-high-performance concrete (UHPC) at different interfaces. The presence of steel fibers enhances the bond strength and provides more interlock, resulting in improved ductility. Among the various surface preparation methods, pressure washing and grooved surfaces exhibit superior bond performance.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Geochemistry & Geophysics
Matt J. Ikari, Andre Huepers
Summary: In laboratory simulations of lithification process, it was found that samples with at least 30% halite content exhibit a combination of velocity strengthening and significant velocity weakening in frictional behavior. The occurrence of velocity weakening is associated with cohesion and porosity reduction in lithified samples, supporting the lithification hypothesis for seismic slip.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Geochemistry & Geophysics
Bin Wang, Di Wang, Michael A. Hicks, Xia-Ting Feng
Summary: In this study, multiscale modeling is used to investigate the physical mechanism of different retrogressive failure patterns, such as earth flow, flowslide, and spread failure. It is found that earth flow failure is related to the shear failure of granular materials, while the development of macroscopic shear bands is accompanied by tensile failure. Friction and cohesion effects are deduced to play key roles in different retrogressive failure patterns, and a novel parameter eta is proposed to quantify the interplay between friction and cohesion. The spectrum of retrogressive failures established in this study explains the failure mechanism based on the changeable dominant effect, either frictional or cohesive, in the soil.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Materials Science, Textiles
Jinkai Che, Zengmeng Zhang, Jiaoyi Hou, Yinglong Chen, Yongjun Gong
Summary: This study established a mechanical model based on the mechanical properties of fibrous tows and their force of interaction with spools, which can help designers determine effective carrying ranges and predict the fiber mechanical behavior. The results of monotous and cyclic tensile tests showed that the maximum relative error of the mechanical model did not exceed 5%, indicating the model's reliability in predicting fiber behavior and assisting in achieving nonlinear control of fibrous tow transferring load.
TEXTILE RESEARCH JOURNAL
(2021)
Article
Multidisciplinary Sciences
A. Fanesi, M. Lavayssiere, C. Breton, O. Bernard, R. Briandet, F. Lopes
Summary: The study revealed that microalgae biofilms respond differently to shear stress in various hydrodynamic environments. Higher shear stress significantly increased the cohesion of the biofilms, allowing them to grow thicker and produce more biomass. Additionally, an acclimation strategy seemed to occur, enabling the biofilms to maintain their growth rate in different hydrodynamic regimes.
SCIENTIFIC REPORTS
(2021)
Article
Materials Science, Multidisciplinary
Xiao Li, Md Reza-E-Rabby, Anthony Guzman, Glenn Grant, Suveen Mathaudhu, Micah Hinton, Anthony Reynolds
Summary: This study develops a visualization method to reveal the deformation during the friction extrusion process by observing the shape change of pre-embedded markers. The distribution of steady-state strain and strain rate in friction extrusion is determined for the first time. The geometry of the deformation zone and dead metal zone are deduced, providing necessary but previously unknown strain and strain rate values for establishing theoretical and numerical models for this thermomechanical process.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Engineering, Chemical
M. Mouzaoui, M. Sauceau, L. Devriendt, J. C. Baudez, P. Arlabosse
Summary: The study investigates the impact of structural changes during sludge treatments on flowability and technical issues using different experimental methods. Results show a transition from pasty to granular-like material at 43 wt% TS content. Sludge exhibits powder-like behavior with increasing frictional interactions, especially above 43 wt% TS content.
Article
Nuclear Science & Technology
Qigang Wu, Mingzhun Le, Jian Wang, Kun Xu, Shuling Xu
Summary: This study analysed the effects of friction coefficients on the packing characteristics of ceramic pebble beds and studied the stress-strain relationship of the pebble bed under different load cycles.
FUSION ENGINEERING AND DESIGN
(2022)
Article
Construction & Building Technology
Wangqing Xu, Junjie Zheng, Jian Chu, Rongjun Zhang, Mingjuan Cui, Hanjiang Lai, Chen Zeng
Summary: This study introduces a new soil improvement method involving the use of urease inhibitor N-butyl-thiophosphoric triamide (NBPT), which increases calcium carbonate precipitation and enhances soil mechanical properties. Laboratory tests demonstrate that the suitable dosage of NBPT can effectively improve soil quality and accelerate the MICP process.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Editorial Material
Engineering, Ocean
Abdellah Cherif Taiba, Youcef Mahmoudi, Mostefa Belkhatir
Summary: The purpose of this paper is to provide a detailed summary of the published paper titled "Stress-strain behavior of marine calcareous soil-tire mixtures" in the journal of Marine Georesources and Geotechnology. The aim of this article is to enhance the content's coherence and present it as a discussion paper by Shariatmadari et al. (2022).
MARINE GEORESOURCES & GEOTECHNOLOGY
(2023)
Article
Geochemistry & Geophysics
Christopher A. Thom, Lars N. Hansen, David L. Goldsby, Emily E. Brodsky
Summary: Rate- and state-friction (RSF) is an empirical framework that describes the complex velocity-, time-, and slip-dependent phenomena observed during frictional sliding of rocks and gouge in the laboratory. We present a new model of rock friction that incorporates various microphysical mechanisms and exhibits behavior consistent with RSF. This model provides analytical predictions for RSF-like behavior and the brittle-ductile transition based on measurable parameters.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Engineering, Geological
Yang Yang, Jian Chu, Hanlong Liu, Liang Cheng
Summary: This paper presents a new method of acidified one-phase-low-pH injection to improve the uniformity of biocement treatment by extending the lag duration, and compares it with the method using HCl.
Article
Engineering, Geological
Hao Chen, Jian Chu, Wei Guo, Shifan Wu
Summary: The paper proposes a conceptual design for land reclamation using a horizontal drainage enhanced geotextile sheet (HDeGs) method combined with vacuum preloading. Large-scale model tests are conducted to verify the effectiveness of the HDeGs method. The results demonstrate that the proposed method is not only effective but also more efficient in reducing construction time for land reclamation compared to traditional methods.
GEOTEXTILES AND GEOMEMBRANES
(2023)
Article
Soil Science
Maryam Naeimi, Jian Chu, Mohammad Khosroshahi, Leila Kashi Zenouzi
Summary: Climate change and desertification have led to increases in sandstorms and sand movements, causing health and economic losses. This study assessed the effect of microbially induced calcium carbonate precipitation (MICP) on the fixation of in situ dunes in northeast Iran, and found that the selection of soil stabilizers is crucial for dune fixation. Additionally, treating with MICP in conjunction with native plants positively affects the wind threshold detachment velocity.
Article
Engineering, Geological
Han-Jiang Lai, Ming-Juan Cui, Jian Chu
Summary: One-phase-low-pH MICP or EICP is a new biocementation method for soil improvement. An experimental study using different initial pH of urease (or bacterial) solution for EICP (or MICP) biocementation showed that the lower the pH, the longer the delay period. However, the EICP or MICP process becomes ineffective when the pH is equal to or lower than 4.5 or 4.0, respectively. The initial pH also significantly affects the strength of treated sand by influencing the morphology and crystallinity of calcium carbonate crystals, but has limited impact on the amount and distribution of calcium carbonate production in soil if the delay duration is sufficient.
Article
Construction & Building Technology
Xiaoniu Yu, Jian Chu, Shifan Wu, Kangda Wang
Summary: This paper presents a method of making biocement using steel slag for soil improvement. The steel slag can be converted to calcium chloride or calcium acetate, which can be used for biocementation through MICP. The study shows that biocement made with steel slag is cost-effective, sustainable, chloride-free, and has better cementation effect.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Yunxin Xue, Arul Arulrajah, Suksun Horpibulsuk, Jian Chu
Summary: This study evaluated the feasibility of using geopolymer to stabilize washed recycled sand and assessed its potential use as pavement subgrade materials. The results showed that the addition of slag in the geopolymer stabilization process improved the compressive strength of the samples compared to those stabilized with fly ash alone.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Geological
Hao Zhang, Hong-lei Sun, Si-jie Liu, Jian Chu, Li Shi, Xue-yu Geng, Yong-feng Deng, Yuan-qiang Cai
Summary: This paper presents a profound solution for dewatering dredged sludge using a combined geotextile tube and vacuum-assisted prefabricated horizontal drains. The study includes an analytical model, numerical verification, field trial, and parametric study to establish an optimal design. The results show that decreasing the horizontal drain interval and increasing the tube height can improve the consolidation efficiency.
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING
(2023)
Article
Engineering, Geological
Han-Jiang Lai, Ming-Juan Cui, Shi-Fan Wu, Yang Yang, Jian Chu
Summary: The study investigates the extraction of soybean urease using different ethanol contents and its effect on the cementation of EICP-treated sand. The proposed extraction method using ethanol can produce clearer crude urease solution from soybean powder. The extracted urease solution with optimal ethanol content contributes to improve the strength of the EICP-treated sand column.
SOILS AND FOUNDATIONS
(2023)
Article
Engineering, Geological
Chang Zhao, Yang Xiao, Jian Chu, Ran Hu, Hanlong Liu, Xiang He, Yi Liu, Xiang Jiang
Summary: Enzymatically induced carbonate precipitation (EICP) in heterogeneous subsurface was experimentally investigated using microfluidic cells with different pore networks. The impact of flow rate and pore-scale heterogeneity on the precipitation process and the morphology of calcium carbonate crystals was quantitatively evaluated. The analysis showed that low flow rates and strong heterogeneity in porous media favor the precipitation process due to more nucleation sites. Additionally, the complex pore structures generated by the precipitates limit the transport of reactants and result in permeability reduction. The study contributes significantly to the understanding of the advection-diffusion-reaction coupling effect and the role of pore network in the biomineralization process.
Article
Engineering, Geological
Han-Jiang Lai, Ming-Juan Cui, Jian Chu
Summary: The performance of geogrid reinforcement in sand can be enhanced by using a biocementation method that involves microbial-induced carbonate precipitation. Triaxial tests were conducted to study the stress-dilatancy behavior of biocemented coarse sand (Bio-CS) treated with the biocementation-enhanced geogrid reinforcement method. The results showed that the interlocking effect between the geogrid and Bio-CS was significantly improved, leading to enhanced stress-dilatancy behavior and mobilization of friction strength.
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2023)
Article
Engineering, Geological
Shifan Wu, Bing Li, Jian Chu
Summary: Biogrouting, as a new method for ground improvement or seepage control, has been extensively studied in recent years. In this study, biogrouting tests were conducted on two 1 m(3) models to simulate in situ conditions. The results showed a significant reduction in permeability and an increase in shear strength after the biogrouting treatment. The mechanical characteristics of the biologically cemented sand were also studied.
PROCEEDINGS OF THE INSTITUTION OF CIVIL ENGINEERS-GROUND IMPROVEMENT
(2023)
Article
Construction & Building Technology
Yueji Bai, Arul Arulrajah, Suksun Horpibulsuk, Jian Chu
Summary: The rapid growth in biomass waste generation has become a significant global challenge, and utilizing biomass waste materials as sustainable construction materials is one potential solution. This study evaluated the engineering and environmental properties of olive stone biochar (OSB) as a green construction fill material, and compared it with recycled glass. The results showed that OSB performed well as a construction fill material and had no adverse environmental impact.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Geological
Maryam Naeimi, Jian Chu
Summary: Prevention of erosion failure in river or coastal dikes has become increasingly important due to climate change. A study investigated the use of microbially induced carbonate precipitation to provide a sustainable solution for sandy dike erosion caused by overtopping. Model tests were conducted on biotreated sand dike models in a hydraulic flume, comparing surface spray and percolation methods. The results showed that biocementation using the percolation or surface spray method effectively prevented erosion.
Review
Engineering, Civil
Yang Xiao, Baofeng Cao, Jinquan Shi, Huanran Wu, Xiang He, Chang Zhao, Jian Chu, Hanlong Liu
Summary: This paper reviews the application of microfluidic techniques in biogeotechnology, discussing microbial behavior, reaction flow, and biomineralization. Microfluidic techniques can reveal the microscopic mechanisms of biogeotechnology, provide evidence for macroscopic experiments, and promote the practical application of biogeotechnology.
TRANSPORTATION GEOTECHNICS
(2023)
Article
Engineering, Geological
Lei Wang, Jian Chu, Shifan Wu
Summary: This study investigated the failure and stress-strain behavior of biocemented sand under plane strain conditions. The increase in calcium carbonate content led to increased brittleness and dilation of the biocemented sand. The friction angle and effective cohesion also increased with the increasing calcium carbonate content.
