Article
Multidisciplinary Sciences
Jianjun Dong, Di Yang, Yuan Mei, Ke Gao
Summary: This study investigates the impact of severe drying-wetting alternation on the safety and stability of high-altitude mining dumps using numerical calculations and theoretical analysis. The results show that increasing intensity of the wetting-drying alternation leads to soil saturation, decreased shear strength, and sliding of the dump, while the cumulative settlement value increases with time and eventually stabilizes.
Article
Construction & Building Technology
Oluwapelumi Olumide Ojuri, Veshara Ramdas, Ebenezer A. Aderibigbe, Charles Gbenga Williams, Santosh Ramchuran, Hassan Al-Nageim
Summary: This study investigated the potential of using locally sourced biopolymer soil stabilisation materials to improve the engineering properties of regional clay soils. The results showed that the use of locally sourced materials significantly enhanced the engineering properties of the clay, with cassava peel powder performing the best.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Article
Engineering, Civil
Jiji Krishnan, Prashansha Sharma, Shruti Shukla
Summary: Colloidal silica as an innovative stabilizer shows potential applications in ground engineering, enhancing the mechanical properties of sand through experimental investigations. The optimal content of colloidal silica varies for sand with different relative densities, with significant improvements in shear strength and hydraulic conductivity observed with its addition.
IRANIAN JOURNAL OF SCIENCE AND TECHNOLOGY-TRANSACTIONS OF CIVIL ENGINEERING
(2021)
Article
Engineering, Geological
Ahmed ElMouchi, Sumi Siddiqua, Emmanuel Salifu, Dharma Wijewickreme
Summary: The study shows that utilizing the MICP technique with sand can significantly improve the compressibility properties of muskeg soils.
CANADIAN GEOTECHNICAL JOURNAL
(2022)
Article
Engineering, Geological
Haibo Miao, Gonghui Wang
Summary: In this study, the residual strength of clayey and granular soils under different shear rates was investigated. It was found that the residual strength of saturated clayey soil is positively influenced by shear rate, while the residual strength of granular soils shows no significant shear rate dependence. Additionally, the clay fraction and fine-size fraction also affect the residual strength.
ENGINEERING GEOLOGY
(2022)
Article
Engineering, Geological
Meghna Sharma, Neelima Satyam, Krishna R. Reddy
Summary: Microbially induced calcite precipitation (MICP) is a promising technique for geotechnical improvement by using bacteria-induced calcium carbonate precipitation. Experiments showed that treatment with specific bacteria under certain conditions can significantly enhance the strength and reduce the hydraulic conductivity of sandy soils.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2021)
Article
Engineering, Environmental
Marcelo Heidemann, Luiz Antonio Bressani, Juan Altamirano Flores
Summary: Through field investigations and simulation tests, it was found that clay veins on a slope in southern Brazil, while not fully controlling the stability of the slope, significantly reduced the overall cohesion and average friction angle.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2021)
Article
Chemistry, Physical
Joanna Fronczyk, Nadella Marchelina, Adam Pyzik, Malgorzata Franus
Summary: Soil properties are crucial for the safety of civil engineering structures. This study focused on the use of microbially induced calcite precipitation (MICP) as a soil improvement method and aimed to find the optimal combination of a bio-cementation solution. Laboratory tests were conducted using bacteria and different cementation solutions, and the results showed that higher concentrations of calcium lactate (CaL) and magnesium (Mg) led to more precipitates during the cementation process. The research achieved higher amounts of precipitates with the optimum combination of bio-cementation solutions, but further investigation is needed to analyze the precipitation processes and reduce the environmental impact.
Article
Engineering, Geological
Sina Saneiyan, Lee Slater
Summary: This study investigated the mechanical properties of soils during unconfined compression testing using the complex conductivity geophysical method. The results showed that imaginary conductivity is highly sensitive to soil deformation and failure, while real conductivity and electrolytic conductivity are less sensitive to these changes. The findings suggest that complex conductivity can effectively track mechanical changes in soils caused by stress and failure, primarily through surface conductivity.
ENGINEERING GEOLOGY
(2021)
Article
Crystallography
Heriansyah Putra, Erizal, Sutoyo, Minson Simatupang, Dede Heri Yuli Yanto
Summary: The study evaluated the effectiveness of the SCU-CP method for improving the shear strength of organic soil through test-tube experiments, SEM-EDS tests, and mechanical tests. Results showed that using 50 g/L of soybeans achieved a hydrolysis rate of 1600 u/g and a precipitation ratio of 100%, leading to a shear strength improvement of 50% in the organic soil samples.
Article
Construction & Building Technology
Hamid Mortazavi Bak, Tahereh Kariminia, Babak Shahbodagh, Mohammad A. Rowshanzamir, Arman Khoshghalb
Summary: This study investigates the application of microbially induced calcite precipitation process at a sandy soil-steel interface, showing that it effectively enhances the interface properties and increases shear strength. The density of the cementation solution is identified as the most influential parameter, while the initial soil moisture content has the least impact on the bio-cementation process of the sand-steel interface.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Engineering, Civil
Shawkat B. M. Hassan, Giovanna Dragonetti, Alessandro Comegna, Asma Sengouga, Nicola Lamaddalena, Antonio Coppola
Summary: The main purpose of this paper is to develop a bimodal pedotransfer function to obtain soil water retention curves and hydraulic conductivity curves. By incorporating aggregate-size distribution, the proposed function improves the prediction accuracy of soil hydraulic properties compared to the traditional unimodal approach.
JOURNAL OF HYDROLOGY
(2022)
Article
Engineering, Civil
D. Moret-Fernandez, B. Latorre, L. Lassabatere, S. Di Prima, M. Castellini, D. Yilmaz, R. Angulo-Jaramilo
Summary: The study investigates the influence of layered soils on the estimation of K-s and S using Sequential Infiltration Analysis (SIA) method, presenting a new approach for analyzing infiltration curves on layered soil profiles. The results show improved estimates of saturated hydraulic conductivity and sorptivity with the SIA method, especially in the presence of soil layering.
JOURNAL OF HYDROLOGY
(2021)
Article
Engineering, Civil
Jidong Teng, Han Yan, Sihao Liang, Sheng Zhang, Daichao Sheng
Summary: The study developed a new hydraulic conductivity model for frozen soils based on the Kozeny-Carman equation, which can be used to explain the migration of water and heat in frozen soils compared to unfrozen soils. Parametric analysis revealed that unfrozen water saturation and shape coefficient ratio are important parameters affecting hydraulic conductivity. The proposed model can also be simplified to a power function for easy use.
JOURNAL OF HYDROLOGY
(2021)
Article
Forestry
Victoria Virano-Riquelme, Karl-Heinz Feger, Stefan Julich
Summary: This article provides a systematic overview of the current state of knowledge on the variations in soil hydraulic properties (SHP) based on forest type in temperate climates. It identifies the gaps and weaknesses in the literature and emphasizes the need for more studies following standardized methodologies to create a robust database.