Article
Engineering, Geological
Hasan Ghasemzadeh, Mohammad Jafarzadeh, Shervin Ahmadi
Summary: This research conducted large-scale tests on geocell-reinforced soils and found that the placement depth and height of geocells have significant effects on soil characteristics. Under static loading conditions, placing geocells at 0.25 times the sample's height from the top surface can effectively control bulging and reduce settlement. Under cyclic loading conditions, placing geocells at 0.05 times the sample's height from the top surface can significantly reduce cumulative strains.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2024)
Article
Green & Sustainable Science & Technology
Vedran Jagodnik, Zeljko Arbanas
Summary: Earthquakes are a significant factor in triggering landslides. They induce cyclic shear stresses and strains in soil, leading to increased pore water pressure and soil weakening. Slopes with low confining stress due to geological conditions are more susceptible to failure. This study investigates the behavior of sandy soil in small-scale landslide models under 1g conditions through undrained and drained cyclic triaxial tests. Simple models for pore pressure build-up and volumetric strain are proposed, which show good correlation with laboratory test data.
Article
Engineering, Geological
Dongjie Yang, Jianhua Hu, Tan Zhou, Xiaotian Ding
Summary: The study analyzed the mechanical properties and damage of granite under cyclic loading at different confining pressures. The results showed that with an increase in cycles, lateral deformation decreased gradually, residual displacement increased, and the deformation modulus decreased with increasing confining pressure.
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2022)
Article
Geosciences, Multidisciplinary
Juehao Huang, Jun Hu, Hongchao Wang, Jian Chen, Shuai Liu
Summary: The excess pore water pressure is the main factor affecting the dynamic response of saturated soft clay under traffic loads. Cyclic triaxial tests were conducted to investigate the development of excess pore water pressure and its relationship with factors such as cyclic stress ratio, loading frequency, and cyclic confining pressure. The results showed that increasing cyclic stress ratios and cyclic confining pressures led to higher maximum excess pore water pressure, while increasing loading frequencies resulted in lower excess pore water pressure. The measured data was well predicted by proposed models.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Engineering, Geological
Juehao Huang, Jian Chen, Wenhui Ke, Yu Zhong, Yuan Lu, Shun Yi
Summary: This study investigated the damping ratio evolution of soft clays under traffic loading through a series of cyclic triaxial tests. It was found that the normalized damping ratio decreases with the increase of accumulated axial strain, while increases with an increase of cyclic stress ratio and effective consolidated confining pressure. Loading frequency and cyclic confining pressure were found to decrease the damping ratio. An empirical formula considering CSR, effective consolidated effective confining pressure, loading frequency, and cyclic confining pressure was established to predict damping ratio under cyclic loading.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2021)
Article
Energy & Fuels
Jian-Tong Liu, Jian-Bo Wang, Hong-Kui Ge, Wei Zhou, Bei-Bei Chen, Xiao-Di Li, Xian-Jie Xue, Sen-Lin Luo
Summary: Due to the existence of gravel, the failure mode of glutenite is not only controlled by confining pressure, but also influenced by the gravel. The failure of glutenite is characterized by producing cracks around gravels, and the distribution patterns of cracks vary under different confining pressures.
Article
Engineering, Geological
Min-Chien Chu, Louis Ge
Summary: A large earthquake may lead to excess pore water pressure in soils, resulting in stiffness degradation and noticeable deformation. The average axial strain in the first cycle was found to determine the degradation path of soils. Excess pore water pressure is usually considered to weaken soils.
ENGINEERING GEOLOGY
(2021)
Article
Energy & Fuels
Quanqi Zhu, Diyuan Li, Wenjian Wang
Summary: Permeability, a fundamental index related to rock damage, was studied through dynamic triaxial compression tests on sandstone under various conditions. Results showed that peak stress, strain, plasticity, damage, and permeability increase with higher incident energy. Only peak stress increases with higher confining pressure.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2021)
Article
Engineering, Geological
Juehao Huang, Jian Chen, Wenhui Ke, Fusheng Liu, Youyan Bian
Summary: The cyclic confining pressure has a limiting effect on soil deformation in cyclic triaxial tests; initial deviator stress has a significant impact on the development of axial strain; the maximum and minimum excess pore-water pressures decrease when the initial deviator stress ratio exceeds 1.0.
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2021)
Article
Geosciences, Multidisciplinary
Hang Yu, Xue-mei Shen, Yu-chen Ye, Jie Yang, Chen-hui Zhu
Summary: The dilatancy equation, which describes the plastic strain increment ratio and its dependence on the stress state, is a crucial component in understanding the behavior of geotechnical materials. Through various tests, it is observed that hysteretic loops appear in stress-strain curves and the elastic strain contributes significantly to the total strain. Additionally, an increase in cement content leads to a smaller dilatancy value determined by total volume strain increment ratio compared to plastic strain increment ratio and highlights the importance of considering elastic deformation in engineering scenarios involving LCSG materials.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Engineering, Civil
Chen Guoxing, Wu Qi, Sun Tian, Zhao Kai, Zhou Enquan, Xu Lingyu, Zhou Yanguo
Summary: The study investigates the liquefaction mechanism and susceptibility of sand-gravel mixtures under undrained cyclic loading, and introduces the average flow coefficient (k(a)) as an index to describe the fluidity of the mixtures. It also proposes a new liquefaction mechanism for these mixtures. The research shows a negative correlation between the cyclic resistance ratio (CRR) and the skeleton void ratio (e(sgk)), with particles smaller than 0.25 mm and mass contents less than 30% primarily serving as fillers of intergranular voids in the mixtures.
JOURNAL OF EARTHQUAKE ENGINEERING
(2021)
Article
Engineering, Geological
Xue-Qian Ni, Zhao Zhang, Bin Ye, Sheng Zhang
Summary: This study investigates the relationship between excess pore water pressure (EPWP) generated in earthquake vibration and liquefaction resistance. It proposes an empirical relation to evaluate liquefaction resistance based on the maximum EPWP ratio accumulated at the first loading cycle.
ENGINEERING GEOLOGY
(2022)
Article
Engineering, Civil
Junhao Tong, Tingyu Wu, Lin Guo, Zonghao Yuan, Hongxu Jin
Summary: Traffic loading is a significant cause of the excess settlement of soft subgrade. This study conducted long-term cyclic triaxial tests to investigate the effects of cyclic vertical stress and variable confining pressure on soft clay. A new index called CSR eta was proposed to synthesize these two factors. An empirical model based on CSR eta was suggested to predict the final permanent axial strain.
TRANSPORTATION GEOTECHNICS
(2022)
Article
Green & Sustainable Science & Technology
Fangnian Song, Weihao Yang
Summary: This research aims to reveal the influence of freezing pressure and confining pressure on the strength characteristics of frozen sand. Triaxial compression tests were conducted using a self-developed high-pressure frozen soil triaxial instrument. The results show that freezing pressure affects the strength of the frozen soil in both strengthening and weakening ways. Compared to confining pressure, freezing pressure has a greater impact on the frozen soil. The comparison of elastic moduli suggests that the initial elastic modulus is more suitable for engineering calculations. In addition, freezing pressure greatly affects the internal friction angle, while cohesion shows little change.
Article
Engineering, Geological
Tian-shun Hou, Wei Zhou, Sibel Pamukcu, Jie Su
Summary: This study investigates the dynamic behavior of expanded polystyrene (EPS) particle amended lightweight soil through consolidated undrained dynamic and monotonic triaxial tests. The study examines dynamic stress, dynamic strain, dynamic pore pressure, and shear strength criterion. The dynamic strain time history curves of lightweight soil can be divided into three stages, namely vibration compaction, vibration deformation, and vibration failure. The dynamic pore pressure development of lightweight soil is affected by the mixing ratios of its components and the confining pressures. General pore pressure, limit equilibrium, and yield criterias are not suitable to describe the dynamic behavior of lightweight soil, whereas the dynamic strain criterion is recommended.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2023)
Article
Engineering, Civil
Karmen Fifer Bizjak, Friderik Knez, Stanislav Lenart, Katja Slanc
STRUCTURE AND INFRASTRUCTURE ENGINEERING
(2017)
Review
Energy & Fuels
Ana Vieira, Maria Alberdi-Pagola, Paul Christodoulides, Saqib Javed, Fleur Loveridge, Frederic Nguyen, Francesco Cecinato, Joao Maranha, Georgios Florides, Iulia Prodan, Gust Van Lysebetten, Elsa Ramalho, Diana Salciarini, Aleksandar Georgiev, Sandrine Rosin-Paumier, Rumen Popov, Stanislav Lenart, Soren Erbs Poulsen, Georgia Radioti
Article
Engineering, Geological
J. A. Smethurst, A. Smith, S. Uhlemann, C. Wooff, J. Chambers, P. Hughes, S. Lenart, H. Saroglou, S. M. Springman, H. Lofroth, D. Hughes
QUARTERLY JOURNAL OF ENGINEERING GEOLOGY AND HYDROGEOLOGY
(2017)
Article
Environmental Sciences
Anna Miszkowska, Stanislav Lenart, Eugeniusz Koda
Article
Engineering, Geological
A. M. Tang, P. N. Hughes, T. A. Dijkstra, A. Askarinejad, M. Brencic, Y. J. Cui, J. J. Diez, T. Firgi, B. Gajewska, F. Gentile, G. Grossi, C. Jommi, F. Kehagia, E. Koda, H. W. ter Maat, S. Lenart, S. Lourenco, M. Oliveira, P. Osinski, S. M. Springman, R. Stirling, D. G. Toll, V. Van Beek
QUARTERLY JOURNAL OF ENGINEERING GEOLOGY AND HYDROGEOLOGY
(2018)
Article
Engineering, Civil
Samo Peter Medved, Bojan Zlender, Stanislav Lenart
Article
Engineering, Multidisciplinary
Bojan Zajec, Mirjam Bajt Leban, Tadeja Kosec, Vili Kuhar, Andraz Legat, Stanislav Lenart, Karmen Fifer Bizjak, Kenneth Gavin
TEHNICKI VJESNIK-TECHNICAL GAZETTE
(2018)
Article
Engineering, Civil
Stanislav Lenart, Amir M. Kaynia
TRANSPORTATION GEOTECHNICS
(2019)
Review
Energy & Fuels
Paul Christodoulides, Ana Vieira, Stanislav Lenart, Joao Maranha, Gregor Vidmar, Rumen Popov, Aleksandar Georgiev, Lazaros Aresti, Georgios Florides
Article
Engineering, Civil
Sebastjan Meza, Alenka Mauko Pranjic, Rok Vezocnik, Igor Osmokrovic, Stanislav Lenart
Summary: Secondary raw materials (SRMs) are seen as a promising and cost-efficient alternative to exploiting natural resources, with the challenge of addressing long-term durability and unknown response in construction works. This paper outlines the activities to establish a fully functioning digital twin (DT) of a road constructed using SRM, emphasizing the need for monitoring systems and presenting a detailed case study.
JOURNAL OF ADVANCED TRANSPORTATION
(2021)
Article
Green & Sustainable Science & Technology
Karmen Fifer Bizjak, Barbara Likar, Stanislav Lenart
Summary: The construction industry generates a significant amount of solid waste due to the use of natural virgin material. This research focuses on developing a new geotechnical composite from residues of the deinking paper industry and validating its practical application through testing and building a pilot retaining wall structure. The study demonstrates the potential of using recycled materials with sustainable design in construction projects.
Article
Construction & Building Technology
Mojmir Uranjek, Andrej Strukelj, Stanislav Lenart, Iztok Perus
CONSTRUCTION AND BUILDING MATERIALS
(2020)
Article
Engineering, Civil
Josipa Domitrovic, Tatjana Rukavina, Stanislav Lenart
TRANSPORTATION GEOTECHNICS
(2019)
Article
Electrochemistry
Bojan Zajec, Mirjam Bajt Leban, Stanislav Lenart, Kenneth Gavin, Andraz Legat
Proceedings Paper
Engineering, Geological
Josif Josifovski, Stanislav Lenart
3RD EUROPEAN CONFERENCE ON UNSATURATED SOILS - E-UNSAT 2016
(2016)