Article
Multidisciplinary Sciences
Hongyan Shen, Xinsheng Li, Ruifeng Duan, Yong Zhao, Jing Zhao, Han Che, Guoxin Liu, Zhijia Xue, Changgen Yan, Jiwei Liu, Chao Jiang, Boke Li, Hong Chang, Jianqiang Gao, Yueying Yan
Summary: Deep cement mixing piles are a key technology for treating settlement distress of soft soil subgrade. However, accurately evaluating the quality of pile construction presents challenges due to material limitations, large number of piles, and small pile spacing. This study proposes using ground-penetrating radar as a technical solution to evaluate the quality of ground improvement in soft soil subgrade reinforcement engineering, providing a rapid, efficient, and economic solution.
NATURE COMMUNICATIONS
(2023)
Article
Soil Science
Luciano Gristina, Agata Novara, Mario Minacapilli
Summary: This study aimed to investigate the impact of tillage on soil translocation and erosion in vineyards, comparing different management practices for soil conservation. The results indicated a high risk of tillage erosion in the majority of vineyards, but adopting cover crops as a best management practice could significantly reduce erosion risk.
SOIL & TILLAGE RESEARCH
(2022)
Article
Engineering, Civil
Jia He, Anguo Huang, Jiafeng Ji, Siyuan Qu, Lei Hang
Summary: The study investigated the use of enzyme induced calcium carbonate precipitation (EICP) technology combined with different types of fibers to improve the erosion resistance of highway embankment slopes against rainfall and surface runoff erosions. The results showed that the EICP technology effectively cemented the soil and improved its mechanical strength and erosion resistance. Samples with glass fiber and steel fiber additions exhibited excellent erosion resistance under rainfall and surface runoff erosion.
TRANSPORTATION GEOTECHNICS
(2023)
Article
Environmental Sciences
Guoxin Shi, Yu Wu, Tianxiao Li, Qiang Fu, Yongxia Wei
Summary: The research investigated the effects of long-term biochar application on soil structure and erosion. The results demonstrated that biochar improved soil hydraulic conductivity, prevented horizontal water diffusion, and enhanced soil water holding capacity. These findings provide practical methods for soil improvement and erosion control in sloping farmland.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Review
Environmental Sciences
Mohammed Awad Mohammed, Nor Zurairahetty Mohd Yunus, Muhammad Azril Hezmi, Dayang Zulaika Abang Hasbollah, Ahmad Safuan Rashid
Summary: This paper discusses the importance of ground improvement in reducing CO2 in the atmosphere, with mineral carbonation as an effective method. Magnesium is found to be more attractive than calcium and has greater potential to increase soil strength.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
Xihua Yang, John Leys, Jonathan Gray, Mingxi Zhang
Summary: Hillslope erosion is the dominant form of erosion in Australia and many parts of the world. This study developed a new approach for setting hillslope erosion improvement (HEI) targets by considering seasonal erosion levels and land management practices. The findings can help identify areas and periods with excessive erosion and suggest management actions for soil improvement.
Article
Energy & Fuels
Ahmed Miftah, Hamed Khodadadi Tirkolaei, Huriye Bilsel, Hany El Naggar
Summary: The main objective of this study was to evaluate the effectiveness of enzymatic induced carbonate precipitation (EICP) treatment for improving erodibility, mitigating scour, and enhancing water infiltration capacity of beach sand. The results demonstrated that EICP treatment significantly improved the erodibility behavior and shear strength of the soil, leading to reduced erosion rates and scour depths.
GEOMECHANICS FOR ENERGY AND THE ENVIRONMENT
(2022)
Article
Engineering, Geological
Muhammad Umair Safdar, Maria Mavroulidou, Michael J. Gunn, Jonathan Garelick, Ian Payne, Diane Purchase
Summary: This study aimed to assess the feasibility of biocementing peat fens soil and screened out suitable microbial candidates for biocementation treatment. The most promising strain was selected for further study and different implementation methods were tried, proving the viability of biocementation. Ongoing work is focusing on optimizing treatments and implementation methods for in situ implementation in the next stage of research.
Article
Engineering, Geological
Anant Aishwarya Dubey, Jack Hooper-Lewis, K. Ravi, Navdeep Kaur Dhami, Abhijit Mukherjee
Summary: The increased occurrence of extreme weather events has raised global concerns about the conservation of riverbanks and coastlines. This study explores the erosion characteristics of soil treated with microbially induced calcite precipitation (MICP) and investigates the effectiveness of biopolymer composite treatment in improving soil resilience against erosion.
Article
Agronomy
Salman A. H. Selmy, Salah H. Abd Al-Aziz, Raimundo Jimenez-Ballesta, Francisco Jesus Garcia-Navarro, Mohamed E. Fadl
Summary: Soil erosion modeling is crucial for soil management and conservation policies. The proposed Spatial Soil Loss Model (SSLM) integrates GIS techniques with USLE and ILSWE models to predict, quantify, and assess soil erosion hazards in the Dakhla Oasis. The study validates the SSLM by comparing its outputs to USLE and ILSWE models, showing promising results for sustainable agriculture in the area.
Article
Soil Science
Manuel Esteban Lucas-Borja, Xin Jing, John T. Van Stan, Pedro Antonio Plaza-Alvarez, Javier Gonzalez-Romero, Esther Pena, Daniel Moya, Demetrio Antonio Zema, Jorge de las Heras
Summary: This study investigated the effects of contour-felled log debris (CFD) and log erosion barriers (LEB) on soil properties after wildfires. The results showed that post-fire management increased soil organic matter and basal respiration, but suppressed soil microbial activities. Both CFD and LEB were effective in retaining sediments and improving post-fire microbiological soil properties. However, after eight years of management, the soil microbiological properties did not completely recover compared to unburned areas.
Article
Environmental Sciences
Hongli Zhang, Guanghui Wang, Jie Du, Xiangjun Pei, Peng Du, Lihong Zhou
Summary: Different polymers have variable effects on soil improvement due to their structures and functional groups. Polymers can enhance soil erosion resistance, water retention capacity, and plant growth.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Environmental Sciences
Daoguo Xu, Yanhu He, Qian Tan
Summary: Soil erosion and sediment yield in watersheds are influenced by land use/cover changes and climatic factors. The current sediment yield index (SYI) model does not take rainfall intensity into consideration. This study aims to improve the SYI model by introducing rainfall-related factors and applies it to estimate sediment yield in the Dongjiang River basin. The improved SYI-CN + R model shows better simulation performance at different time scales and provides insights into the spatial distribution of sediment yield in the basin.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Soil Science
Xinliang Wu, Sixu Yao, Jinxing Zhou
Summary: The coupling effect of slaking and mechanical breakdown on aggregate stability was evaluated using a new method. This method can partition the unique and shared effects of these two breakdown mechanisms and showed better performance in predicting soil erosion compared to existing methods.
SOIL & TILLAGE RESEARCH
(2024)
Article
Engineering, Geological
Alena J. Raymond, Jason T. DeJong, Alissa Kendall, J. Tanner Blackburn, Rick Deschamps
Summary: The study evaluated the sustainability of five ground improvement methods in mitigating liquefaction impacts, finding that deep soil mixing and compaction grouting are the most impactful and costly methods, while vibratory methods and deep dynamic compaction are more sustainable.
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING
(2021)
Article
Engineering, Civil
Yanxin Yang, Edward Kavazanjian
Summary: This study conducts Newmark analyses on lateral spreading induced by liquefaction using a database of 22 documented case histories. The site stratigraphy and SPT values for the liquefiable soil are determined based on the case-history documentation. The yield acceleration is estimated using three different correlations with SPT blow count to estimate the post-liquefaction residual shear strength. Representative acceleration time histories from earthquake recordings are selected. The probabilistic analysis suggests that the lateral spreading displacement calculated using the Olson and Johnson correlation will not exceed twice the reported displacement with a confidence level of 97%.
JOURNAL OF EARTHQUAKE ENGINEERING
(2022)
Article
Construction & Building Technology
Hamed Khodadadi Tirkolaei, Neda Javadi, Vinay Krishnan, Nasser Hamdan, Edward Kavazanjian
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2020)
Article
Engineering, Geological
Vinay Krishnan, Hamed Khodadadi Tirkolaei, Kimberly Martin, Nasser Hamdan, Leon A. van Paassen, Edward Kavazanjian
Summary: By biocementing standard Ottawa 20-30 sand using enzyme-induced carbonate precipitation (EICP), it was found that sand from different quarries within the same geological formation may not respond in the same manner to biocementation. Therefore, standard sands for mechanical geotechnical testing should not be automatically assumed to be suitable for biogeotechnical testing.
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING
(2021)
Article
Engineering, Geological
Wu Gao, Edward Kavazanjian
Summary: A constitutive model was developed to describe the stress-strain-time behavior of decomposing municipal solid waste (MSW), considering three sources contributing to MSW hardening. The model was validated through laboratory and field tests, showing good agreement with measured vertical deformations but significant discrepancies in horizontal displacements. Sensitivity studies revealed the model's high sensitivity to the biodegradation rate of MSW, suggesting potential improvements by incorporating deviatoric creep deformations.
Article
Engineering, Geological
Hai Lin, Sean T. O'Donnell, Muhannad T. Suleiman, Edward Kavazanjian, Derick G. Brown
Summary: The study demonstrates that both EICP and MICP treatments can create a cemented soil zone around pervious concrete piles, improving pile capacity and load transfer under compression loading.
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING
(2021)
Article
Engineering, Geological
Wu Gao, Edward Kavazanjian, Xuan Wu
Summary: This study numerically investigates the tensile strain development in high-density polyethylene (HDPE) geomembrane (GMB) liner systems in landfills. A new constitutive model for municipal solid waste (MSW) was employed to analyze the influence of various factors on tensile strains. The results reveal that landfill geometry, interface friction angles, and waste settlement significantly affect the development of tensile strains.
Mitigation strategies, such as using a HDPE GMB with different friction angles on its upper and underlying interfaces, increasing the number of benches, and reducing the slope inclination, are shown to reduce the maximum tensile strain caused by waste placement and settlement.
GEOTEXTILES AND GEOMEMBRANES
(2022)
Article
Engineering, Environmental
Evelyn M. Miranda, Carli Severson, Jeffrey K. Reep, Daniel Hood, Shane Hansen, Leonard Santisteban, Nasser Hamdan, Anca G. Delgado
Summary: The study found that lignocellulosic sulfate-reducing bioreactors acclimated to mining-influenced water in continuous mode have good feasibility for efficient metal(loid) removal within a short period of time. The bioreactor microbial communities varied between spent brewing grains and sugarcane bagasse reactors, affecting the location of sulfate-reducing microorganisms and SO42- reduction efficiency.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Crystallography
Vinay Krishnan, Hamed Khodadadi Tirkolaei, Maryam Kazembeyki, Leon A. van Paassen, Christian G. Hoover, Jong Seto, Edward Kavazanjian
Summary: The mechanical properties of calcium carbonate minerals formed by enzyme-induced carbonate precipitation (EICP) were studied using nanoindentation. It was found that the modified precipitate had higher ductility and resistance to crack propagation, which may contribute to improved cementation in sands with low carbonate contents.
Article
Environmental Sciences
Michael Edgar, Nasser Hamdan, Dominic Morales, Treavor H. Boyer
Summary: Basic oxygen furnace (BOF) and blast furnace (BF) steel slags are effective for phosphorous (P) removal from nonpoint sources. This study compared laboratory column experiments and field filter experiments to investigate the influence of relevant field conditions on P removal by different slag mixtures. The results showed that alkalinity was the most influential variable, and BF slag with Al2(SO4)3 regeneration was best suited for high alkalinity conditions, while BOF slag with NaOH regeneration performed best under low alkalinity conditions.
Article
Engineering, Geological
Diane M. Moug, Kayla R. Sorenson, Arash Khosravifar, Melissa Preciado, Elizabeth Stallings Young, Leon van Paassen, Edward Kavazanjian, Benchen Zhang, Kenneth H. Stokoe, Farnyuh M. Menq, Yumei Wang
Summary: This paper presents field trials of microbially induced desaturation (MID) conducted in Portland, Oregon. MID treatment stimulates native denitrifying microbes to reduce the in situ degree of saturation and mitigate the potential for triggering liquefaction. Monitoring data from the two trial sites demonstrate successful desaturation of liquefiable soil, which persisted for at least 92 days post-treatment.
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING
(2022)
Article
Engineering, Geological
Chen Zeng, Leon A. Van Paassen, Jun-jie Zheng, Elizabeth G. Stallings Young, Caitlyn A. Hall, Yvo Veenis, Wouter R. L. Van der Star, Maria Konstantinou, Edward Kavazanjian
Summary: This study conducted a field trial to test the feasibility of microbially induced desaturation and precipitation (MIDP) by denitrification for stabilizing silty soil. The results showed that denitrifying micro-organisms actively converted substrates and produced biogenic gas and minerals. However, the distribution of substrates and reaction products was significantly affected by the permeability of soil layers.
Article
Engineering, Environmental
Lucas Crane, Hannah Ray, Nasser Hamdan, Treavor H. Boyer
Summary: Enzyme-induced carbonate precipitation (EICP) has the potential to reduce carbon dioxide emissions compared to traditional cementation methods. This study investigated the use of fresh human urine and calcium-rich zeolites as sustainable alternatives for EICP. The results demonstrated that calcium-rich chabazite had higher ammonium adsorption and calcium release capabilities compared to calcium-rich clinoptilolite. The inclusion of a pre-hydrolysis step and longer adsorption times had significant impacts on ammonium adsorption and precipitation outcomes.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Engineering, Geological
M. G. Arab, R. Alsodi, A. Shanablah, E. Kavazanjian, W. Zeiada
Summary: Testing with a dynamic shear rheometer and rheological analysis were conducted to study the detachment behavior of bio-cemented soil at a microstructural level, showing potential for mitigating fugitive dust emissions caused by wind-blown soil. The strong correlation between wind tunnel tests and DSR results demonstrates the capability of the device to capture the detachment potential of soil bio-cemented using EICP, providing insights into optimizing bio-cementation for dust control and assessing soil microstructure strength for other geotechnical applications.
GEOTECHNIQUE LETTERS
(2021)
Article
Water Resources
Michael Edgar, Hannah Ray, Dennis G. Grubb, Leon A. van Paassen, Nasser Hamdan, Treavor H. Boyer
JOURNAL OF SUSTAINABLE WATER IN THE BUILT ENVIRONMENT
(2020)