Article
Engineering, Multidisciplinary
Kun Du, Xuefeng Li, Shanyong Wang, Ming Tao, Gen Li, Shaofeng Wang
Summary: The coupling of compressive and shear stresses in underground engineering affects surrounding rocks. Variable angle shear tests and direct shear tests can achieve different stress states. Analysis of shear strength parameters and acoustic emission characteristics during rock failure process shows the efficiency of micro-crack generation in shear failure compared with compression failure.
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
Construction & Building Technology
Fang Wang, Chuan Lu, Kai Liu, Xianzeng Shi, Chaoliang Fu, Zhuang Wu
Summary: A viscoelastic model-cohesive zone model-random aggregate model (VM-CZM-RAM) composite structure model is proposed to describe the interlaminar complex contact form of AP-GB asphalt pavement with gravel base. The influences of gravel embedded in AP-GB on interlamination stability are considered. The results show that the interlaminar shear strength is positively correlated with the vertical load and shear speed under the optimal interlaminar gravel embedded rate.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2022)
Article
Engineering, Environmental
Zhanchao Yin, Qingsong Zhang, Xiao Zhang, Jiaqi Zhang, Xianghui Li
Summary: Currently, slurry-soil interface direct shear (IDS) tests and triaxial compression (TC) tests are used to determine the shear strength of grouted soil. However, previous studies have mainly focused on sandy soils and paid less attention to clayey soil. This study introduces two grouting test methods for fabricating grouted clay specimens suitable for TC and IDS testing. Findings show that outcomes obtained from IDS tests are unreliable, and using TC tests to obtain accurate shear strengths of grouted clay is crucial for predicting soil deformation and developing rational construction schemes.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2022)
Article
Engineering, Environmental
Celal Emre Uyeturk, Nejan Huvaj
Summary: The mechanical behavior of residual soils was studied through constant water content direct shear tests, revealing that shear strength increases with decreasing saturation and the relationship between shear strength and saturation is nonlinear. Additionally, a more dilative response was observed with decreasing saturation and applied normal stress.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2021)
Article
Green & Sustainable Science & Technology
Lihua Li, Han Yan, Henglin Xiao, Wentao Li, Zhangshuai Geng
Summary: By using different percentages of photoinitiator and carbon black powder, different properties of photocurable geomembranes can be obtained to prevent failures at the seams, suitable for various engineering applications. The study results show that different interfaces of photocured geomembrane with clay/sand exhibit varying friction characteristics, with the sand interface having a higher friction angle than the clay interface, indicating better shear and tensile crack resistance.
Article
Engineering, Geological
Dakuo Feng, Jianmin Zhang, Wenjun Hou
Summary: The normal stiffness significantly affects the behavior of the interface, leading to accelerated degradation of cyclic shear strength with increased normal stiffness. The variation in normal stress induces anisotropy in shear strength, while it has no impact on the inherent isotropy of strength coefficient. The relationship between performance parameters is not significantly influenced by normal stiffness, simplifying the 3D constitutive description of the interface.
Article
Engineering, Geological
Yu-ran Xu, Yongfu Xu
Summary: The study utilized discrete element software for numerical simulation of rock single particle crushing and rockfill direct shear test, revealing a power function relationship between shear strength and normal stress, with the exponent dependent on the particle fractal dimension.
Article
Construction & Building Technology
Huaxiang Su, Wei Fan, Hongxiang Wang, Bin Liu, Wenbiao Sun, Xudong Shao
Summary: This study aims to clarify the shear mechanism and strength of a new gravity-type grouted sleeve connection using ultra-high performance concrete (UHPC). Direct shear tests were conducted to investigate the shear performance of the UHPC-based connection. The test results showed that the shear strength of the UHPC-based connection is significantly higher than that of the traditional connection, and its failure mode is more similar to that of cast-in-place (CIP) specimens. Based on the analysis of the shear mechanism, formulas were proposed to predict the shear strength of the UHPC-based connection, which were validated by the experimental data.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Chemistry, Physical
Xin Liang, Fang Yan, Yuliang Chen, Huiqin Wu, Peihuan Ye, Yuhuan Mo
Summary: The study focused on mechanical properties of recycled aggregate concrete (RAC) at different ages by testing direct shear strength and cube compressive strength of 264 standard cubes. It was found that the replacement ratio has minimal impact on crack patterns, with direct shear strength and residual strength varying with time and replacement ratio. The load-displacement curve of RAC at direct shearing showed distinct stages of elasticity, elastoplasticity, plasticity, and stabilization.
Article
Engineering, Geological
Niloufar Mashhadiali, Fatemeh Molaei
Summary: This study proposes a theoretical model to predict the shear strength of anisotropic rocks based on the inclination of inherent structural weak planes. Triaxial and direct shear tests were conducted on shale samples to verify the anisotropic behavior. The experimental results showed a U-shape relationship between compressive strengths and inclination of bedding planes. Based on the Coulomb-Navier criterion, a theoretical model was derived to relate shear strength to the inclination of bedding planes. Direct shear tests confirmed the proposed criterion and showed shear anisotropy behavior.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2023)
Article
Construction & Building Technology
Shuo Feng, Huigang Xiao, Yifei Li
Summary: This study investigates the bond strength between ultra-high-performance concrete (UHPC) and normal-strength concrete (NSC) and develops a modified direct tensile test method to measure the bond strength. The results demonstrate that the modified direct tensile test method can better reflect the effect of roughness on bond performance, especially on rough surfaces.
CEMENT & CONCRETE COMPOSITES
(2022)
Article
Construction & Building Technology
Juan Manuel Girao Sotomayor, Giovanna Monique Alelvan, Michele Dal Toe Casagrande
Summary: This research evaluated the effects of polymeric fiber reinforcement in gold ore tailings through direct shear tests and various characterization tests. The results showed that fiber addition can increase the friction angle and change the residual behavior of the composite, making it suitable for interface areas with materials of different stiffness.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2021)
Article
Engineering, Civil
Hongya Qu, Hao Lv, Tao Zhang, Tiantian Li, Zhiqiang Wang
Summary: This study investigates the shear behavior of short precast bridge columns with different design details. The test results reveal two types of shear failure caused by different embedment locations of grouted splice sleeve connectors. Factors such as steel grade, bonding material, and shear keys also affect the shear strength of precast columns. A new theoretic method is proposed to estimate shear strength, which shows better accuracy compared with other methods. This study provides valuable insights into the shear behavior of short precast columns.
ENGINEERING STRUCTURES
(2022)
Article
Engineering, Civil
Mohammed Alwalan, Abdullah Almajed, Kehinde Lemboye, Ahmed Alnuaim
Summary: A laboratory study was conducted to investigate the shear strength of bio cemented sands using enzyme-induced carbonate precipitation (EICP) via direct shear test. Different application methods of EICP solution were used and it was found that the method of introducing the solution affected the distribution pattern of CaCO3 precipitation and resulted in different shear strength responses. The injection method achieved the highest shear strength and interparticle cementation, followed by percolation, while the spraying and mix-&-compact methods produced weaker particle bonds but still performed better than untreated sands.
KSCE JOURNAL OF CIVIL ENGINEERING
(2023)
Article
Engineering, Civil
Ruiqing Lang, Hao Xiong, Liqiang Sun, Zhou Yadong
Summary: A simplified semi-empirical method was proposed to predict the additional stress on the underlying layer of the rigid pile-net composite foundation, which was verified through finite element analysis and experimental tests. The key factor affecting the additional stress, the equivalent frictional resistance coefficient, was deduced and analyzed using static balance theory and the beta-method. The accuracy of the proposed simplified semi-empirical model was confirmed through good agreement between experimental and numerical results.
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING
(2022)
Article
Engineering, Civil
Li Sa, Li Ting-ting, Sun Li-qiang, Liu Xin, Gou Le-yu
Summary: This paper presents the finite element results of large deformation in spudcan reinstallation, considering the effect of soil disturbance. The failure mechanisms of spudcan reinstalled in disturbed and undisturbed soil are proposed and the influence of soil disturbance on the position of maximum horizontal force and moment is discussed.
CHINA OCEAN ENGINEERING
(2022)
Article
Engineering, Ocean
QianBiao Liu, Sa Li, JiangSong Yin, TingTing Li, Molin Han
Summary: In this study, artificial intelligence techniques were used to simulate the mechanical behavior of carbonate gravels, and highly accurate models were developed. The shear strength of the gravel was also predicted, showing that the nonlinear model is more suitable for heavily broken gravel with high normal stress. Modeling the mechanical behavior of soil using artificial intelligence is an economical and convenient method to evaluate the mechanical properties of gravel.
MARINE GEORESOURCES & GEOTECHNOLOGY
(2023)
Article
Engineering, Ocean
Daokun Zhuang, Wei Guo, Liqiang Sun, Yuxiao Ren
Summary: This article evaluates the effects of loading rate on excess pore water pressure (EPWP) and soil strength through a series of triaxial extension stress path tests, and finds that loading rate has a significant influence on both EPWP and soil strength.
MARINE GEORESOURCES & GEOTECHNOLOGY
(2023)
Article
Engineering, Geological
Yuxiao Ren, Jinfang Hou, Liqiang Sun, Hao Chen, Wei Guo
Summary: This paper presents a case study of using geotextile mattresses (GMs) to construct a temporary road on very soft soil in a land reclamation project in Tianjin, China. The design and construction process of the project are described, highlighting the advantages and considerations of using GMs.
INTERNATIONAL JOURNAL OF GEOSYNTHETICS AND GROUND ENGINEERING
(2022)
Article
Engineering, Geological
Xin Liu, Sa Li, Liqiang Sun, Tingting Li
Summary: This study investigates the mechanical behavior and particle breakage of carbonate sand under simple shear condition. The experimental results show that particle crush can reduce shear strength and restrain dilatancy, and the impact of particle crush can cause the shift of ultimate state line.
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2022)
Article
Engineering, Geological
Ruiqing Lang, Changhu Ma, Liqiang Sun, Shu Lin, Shuwang Yan, Zhiliang Huo, Weichao Yang
Summary: The load-transferring mechanism of rigid pile-net composite foundations is analyzed using a three-dimensional analytical model in this paper. The multiple geosynthetic-reinforced cushion layer is idealized as a plate with large deflection, and its bending stiffness matrix is derived. The accuracy of the analytical method is validated through comparison with experimental results. A parametric study reveals the influences of various factors on the load-transferring mechanism.
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2022)
Article
Engineering, Ocean
Tingting Li, Sa Li, Liqiang Sun, Jiangsong Yin, Xin Liu
Summary: This paper presents a practical case of spudcan punch-through in a multi-layer soil and investigates the failure mechanisms using LDFE analysis with the CEL method. The results show that the failure of the soil changes from general shear to punch-through and squeezing as the spudcan penetrates. The transition point of the failure mechanism can be identified based on the depth of the failure surface obtained from the LDFE results. A modified approach is proposed to estimate the spudcan penetration resistance in the multi-layer soil, which is in good agreement with the field data and laboratory element tests.
MARINE GEORESOURCES & GEOTECHNOLOGY
(2023)
Article
Engineering, Geological
Leyu Gou, Sa Li
Summary: In this study, a biobased lightweight geomaterial called lightweight sand-mycelium soil (LSMS) was proposed and its dynamic properties were investigated through strain-controlled cyclic triaxial tests. The results showed that LSMS is self-sustaining due to the bonding of sand particles and wheat bran by fungal growth. The shear modulus (G(d)/G(0)) of LSMS decreased with increasing substrate material content (W-s), and the influence of effective confining pressures on G(d)/G(0) was weakened. The damping ratio of LSMS was strain dependent, and its influence varies with different shear strains.
Article
Engineering, Ocean
Yurong Zhang, Shuntao Fan, Li Sa, Yilin Wang
Summary: This study investigates the effect of uplift rate on drainage conditions and suction force, and finds that the suction force increases and then decreases with reducing extraction rate. The study also discusses the effects of soil strength heterogeneity, preload, and perforation width on suction force with drainage conditions.
MARINE GEORESOURCES & GEOTECHNOLOGY
(2023)
Article
Engineering, Marine
Yurong Zhang, Sa Li, Shuntao Fan, Molin Han, Zhenyi Shen
Summary: This study proposes a simplified plastic limit analysis (SPLA) to analyze the soil profile with surficial crust for suction caissons with small aspect ratios. The SPLA method is improved by incorporating an improved expression of the bearing factor derived from numerical simulation and corresponding failure mechanisms, particularly for short suction caissons. The crust effect is incorporated into the SPLA calculations through the equivalent depth method. The results show that the proposed SPLA method gives good agreement in predictions with the horizontal bearing capacity and optimal loading depth.
Article
Engineering, Marine
Lan Lin, Sa Li, Linying Huo, Xin Liu
Summary: This paper systematically investigates the fractal behavior of coral sand in the South China Sea under impact loads. It finds that the gradation curve of coral sand exhibits evident fractal characteristics after fragmentation, and the ultimate fractal dimension is independent of particle size and uniformity coefficient. A relative breakage index based on the relationship between fractal dimensions is proposed.
Article
Engineering, Marine
Jie-feng Liu, Sa Li, Zhen-yi Shen, Shun-tao Fan
Summary: Investigation into the strain-softening behavior of clay is crucial for offshore geotechnical engineering. This study proposes an exponential strength degradation model and verifies its accuracy by comparing it with other models. The effectiveness of the model is confirmed through a finite element analysis of pipe-clay interaction. Accurately evaluating the degradation of undrained shear strength of clay is essential.
Article
Computer Science, Interdisciplinary Applications
Yurong Zhang, Shuntao Fan, Sa Li, Zhenyi Shen
Summary: This study analyzes the effect of the installation process on the subsequent foundation consolidation response. By comparing the results from large deformation finite element analysis and small strain finite element model, the influence of large soil deformations on consolidated bearing capacity is examined. The relationship between preload and settlement is determined and a revised time factor function is proposed.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Shuntao Fan, Yurong Zhang, Sa Li, Molin Han, Jiefeng Liu
Summary: This paper proposes a simplified modified swipe method, compares its performance with four other loading methods in different geological profiles, and discusses its performance under complex conditions and parameter sensitivity. The study finds that the elastic modulus of soil affects the shape of the failure envelope, and that the accuracy of the simplified modified swipe method can be ensured by increasing the modulus or enhancing the loading ratio. The overall comparison shows that the simplified modified swipe method is effective in terms of accuracy, speed, and ease of implementation, making it an attractive and convenient solution for obtaining failure envelopes.
COMPUTERS AND GEOTECHNICS
(2023)
