Article
Engineering, Geological
Juan Du, Gang Zheng, Bingyang Liu, Ning-Jun Jiang, Jun Hu
Summary: This study demonstrates that the strength of cement-stabilized OMDS is lower than that of cement-stabilized non-organic sand, but with increasing confining pressure and curing time, the maximum and residue deviator stress, axial strain at failure, and elastic modulus also increase.
Article
Construction & Building Technology
Afshin Kordnaeij, Reza Ziaie Moayed, Peyman Jafarpour, Alireza Mansoori, Hossein MolaAbasi
Summary: The process of cement production is costly and one of the main factors in carbon dioxide emission. Part of it should be replaced with eco-friendly pozzolanic materials like zeolite. In this research, a polynomial neural network (PNN) model was used to predict the stress-strain behavior of zeolite-cement injected sand, which was determined to be accurate and reliable.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Chemistry, Physical
Deluan Feng, Haiqin Gao, Zhanlin Li, Shihua Liang
Summary: Microbial solidification of sand has significant effects in terms of energy-saving and environmental protection. This study investigates the influence of clay content on the effectiveness of microbial solidification of sand through triaxial consolidation undrained tests. The results show that the failure strain and unconfined compressive strength of the treated samples first increase and then decrease with the increase in clay content. Additionally, the internal friction angle and cohesion of the sand increase first and then decrease after microbial treatment. The contact modes between sand, clay, and calcium carbonate were also analyzed.
Article
Computer Science, Artificial Intelligence
Hossein MolaAbasi, Aghileh Khajeh, Reza Jamshidi Chenari
Summary: This study used a neural network approach to predict the stress-strain and pore pressure-strain behavior in cement-treated sands, considering variables such as cement content, confining pressure, porosity, and curing time. The results show that GMDH modeling is capable of accurately predicting test data, compared to other machine learning methods.
NEURAL COMPUTING & APPLICATIONS
(2021)
Article
Engineering, Geological
Danial Shirkavand, Kazem Fakharian
Summary: The shear modulus (G) in sands changes with variations in the degree of saturation. The matric suction in unsaturated sands increases the effective stress and consequently the shear modulus. The relationship between G/Gsat variations and matric suction is complex and requires in-depth evaluations.
ENGINEERING GEOLOGY
(2023)
Article
Engineering, Environmental
Jurong Bi, Siau Chen Chian
Summary: Elevated curing temperature has been found to enhance both early and long-term strength of cement-stabilised clays, which differs from the effect on concrete, mortar, and cement-stabilised granular soil. The distinct temperature effects on long-term strength behavior are mainly attributed to increased strength-enhancing materials in the cement-soil system and the presence of fine-grained clay particles. A generic method to evaluate temperature sensitivity on cementitious systems and a novel approach to incorporate temperature effect on the strength development of cement-stabilised clayey soil have been proposed and validated in this paper.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2021)
Article
Geochemistry & Geophysics
Wei Wang, Jian Li, Jun Hu
Summary: The addition of nanoclay can improve the shear properties of calcareous sand, increasing its peak stress and cohesion.
Article
Construction & Building Technology
Diana Maria Paynor Balani, Mamoru Kikumoto, Ying Cui
Summary: This study investigated the effect of incorporating low-density polyethylene (LDPE) on sand behavior through consolidated-drained triaxial tests. The results showed that the addition of 1.5% to 2.0% LDPE content increased the peak strength of the sand by approximately 40%, but further increases in LDPE content led to a decrease in peak strength. Therefore, an LDPE content of 1.5% to 2.0% was identified as the optimal percentage for enhancing sand strength. The shear stiffness of the LDPE-mixed sand also decreased by 25-35% compared to unreinforced samples.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Marine
Yuzhe Ren, C. F. Chiu, Lu Ma, Y. P. Cheng, Litong Ji, Chao Jiang
Summary: The maximum shear modulus (G(max)) is an important factor determining soil deformation and seafloor stability. This study investigated the G(max) of a hydrate-bearing sand-silt mixture and found that hydrate significantly contributed to the skeletal stiffness of the soil mixture. The study also revealed the importance of hydrate morphology in determining the stiffness of the soil mixture, which was sensitive to the effective stress.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Marine
Lu Liu, Xiaofei Yao, Zhanpeng Ji, Hongmei Gao, Zhihua Wang, Zhifu Shen
Summary: Calcareous sand from the South China Sea shows higher liquefaction resistance compared to silica sand, with notable effects from changes in cyclic stress ratio and relative density. Differences in pore pressure generation characteristics and deformation responses between calcareous and silica sands were also observed.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Engineering, Civil
Houzhen Wei, Hao Liu, Xiaoxiao Li, Zhao Tao, Yongjie Wu, Jianhua Shen, Mei Yin
Summary: This study investigates the mechanical behavior of calcareous sand under different stress paths. The results show that consolidation pressure and stress path have significant effects on the volume strain, strength, and particle breakage of calcareous sand.
Article
Environmental Sciences
Zhanguo Xiu, Shuhong Wang, Yingchun Ji, Feili Wang, Fengyu Ren
Summary: The application of CPB can lead to clean, efficient, and safe mining in underground metal mines. The triaxial mechanical properties of CPB are significantly influenced by different curing conditions, with the deviator stress versus axial strain curve becoming more obvious with the increase of lateral constraint ratio. Increases in curing time and temperature, or drainage conditions, can lead to significant increases in peak deviator stress and cohesion of CPB, but a decrease in internal friction angle.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Engineering, Chemical
Lei Gao, Bingbing Wei, Xiaochuan Hu, Zaifeng Yao, Yiwen Fang, Xuejian Gao
Summary: In this study, a numerical model of sand triaxial test was established using discrete element software PFC3D, and an indoor triaxial test was conducted to calibrate the numerical model. The influence of microscopic parameters on the macroscopic mechanical response of sand was analyzed. The results showed that the friction coefficient had the greatest impact on the peak strength and residual strength of the sand's stress-strain curve, and it was positively correlated. The normal tangential stiffness ratio was negatively correlated, while the porosity and boundary flexibility stiffness had minimal influence on it.
Article
Engineering, Geological
Zhiyong Yang, Xing Yang, Yanjie Ding, Yusheng Jiang, Weiqiang Qi, Zhengyang Sun, Xiaokang Shao
Summary: This study investigates the characteristics and behavior of soil during tunneling using different soil conditioning methods. Suggestions for reducing starting torque during the operation of a shield machine are proposed.
Article
Construction & Building Technology
Hailong Li, Xueyu Pang, Jian Zhang, Xian Shi
Summary: The mechanical behavior of a low-density cement under shale oil in-situ conversion conditions was studied in this paper. A series of tests were conducted to determine its physical and mechanical properties, and XRD and TGA tests were performed for composition evaluations after exposure to high temperatures. The results showed that the cement's strength was stabilized after 7 days at 50 degrees C, but deteriorated significantly at temperatures above 380 degrees C due to the decomposition of hydration products. The triaxial test results indicated that the mechanical properties were sensitive to confining pressure, and pore collapse was the main cause for the change in failure patterns from brittle to ductile.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Geological
Abu Taher Md. Zillur Rabbi, Md. Mizanur Rahman, Donald A. Cameron
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING
(2018)
Article
Engineering, Geological
Abu Taher Md Zillur Rabbi, Md Mizanur Rahman, Donald A. Cameron
SOILS AND FOUNDATIONS
(2019)
Article
Engineering, Geological
Abu Taher Md Zillur Rabbi, Md Mizanur Rahman, Donald Cameron
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2019)
Article
Green & Sustainable Science & Technology
Md Mizanur Rahman, Simon Beecham, Asif Iqbal, Md Rajibul Karim, Abu Taher Zillur Rabbi
Article
Engineering, Geological
Md Mizanur Rahman, Hoang Bao Khoi Nguyen, Abu Taher Md Zillur Rabbi
GEOTECHNICAL RESEARCH
(2018)
Proceedings Paper
Engineering, Civil
A. T. M. Z. Rabbi, D. A. Cameron, M. M. Rahman
UNSATURATED SOILS: RESEARCH & APPLICATIONS, VOLS 1 AND 2
(2014)