bluuebunny/crossref_metadata_2025_split huggingface dataset:
Screening effect of pile rows for ground vibration induced by moving loads
Authors: Yang S , Jia M C 
Published: May 2024

Abstract
This study aims to predict the screening efficiency of pile rows in transversely isotropic (TI) saturated soils for ground vibrations subjected to moving loads. First, based on the fundamental solutions of TI saturated media, the boundary element method (BEM) was adopted to derive the force-deformation equation of the soil-pile boundary. The finite element method (FEM) was then applied to establish the stiffness matrix equation of the Euler-based pile rows. Subsequently, by coupling the BEM and FEM equations, the screening efficiency of the pile rows was developed according to the barrier isolation theory. The proposed approach was validated using published numerical results. Finally, the effect of soil stratification on the screening effect of pile rows in TI saturated soils was investigated.
Application of material point method in modeling soil-geosynthetics interactions-a literature survey
Authors: Liu J , Lin C , Pokharel S 
Published: May 2024

Abstract
The material point method (MPM) has garnered significant attention in recent years owing to its advantages in solving soil–water-structure interaction problems involving large deformations in geotechnical engineering. The MPM combines the benefits of point-based and mesh-based approaches (finite element method) with both Eulerian computational mesh and continuum descriptions of materials. The successful integration of MPM in simulated landslides, internal erosion, and excavation has been frequently reported. However, solving the soil–geosynthetic interaction problem with the MPM has not been explored, although such problems often entail large deformations. The goal of this study is to collate studies on the simulation of geosynthetics and their interactions with soil using MPM. This paper first discusses the basics of MPM and the formation of thin membrane materials using MPM. It also includes limited applications of MPM in simulating soil–geosynthetic interactions. The applications demonstrate that the MPM is particularly effective in resolving large deformation problems associated with geosynthetics, including problems of landfill settlement, reinforced-slope stability, and geocontainer dropping.
Influences of number of geosynthetic reinforcement layers on soil arching under cyclic loading
Authors: Li G , Xu C , Zhou X , Shen P , Luo M 
Published: May 2024

Abstract
Geosynthetic-reinforced pile supported (GRPS) embankments have been widely used in highways and railways on soft subsoil. During the operation period, these embankments are often subjected to cyclic loading, such as traffic loading. Considering that soil arching is a key load transfer mechanism in these embankments, the development of soil arching under cyclic loading is vital important to operational safety of these embankments. Conventional trapdoor system cannot represent actual conditions of soil arching in GRPS embankments because it have a forcibly-moved trapdoor and cannot simulate load-induced subsoil settlement. Hence, this paper used a self-moving trapdoor supported by compression springs that moved up and down dependent on its overburden pressure. To investigate influences of number of geosynthetic reinforcement layers on soil arching under cyclic loading, two self-moving trapdoor tests were conducted, including a single layer and two layers, where the total reinforcement stiffness were approximately same. The trapdoor test results show that the inclusion of two reinforcement layers with a fill layer of a certain height in between reduced surface settlement of the fill and tensile forces of reinforcement, as compared with a single reinforcement layer. It also enhanced soil arching effect and improved the stability of soil arching under cyclic loading.
Predicting permeability coefficient in soil-rock mixtures using parameters from the negative exponential continuous grading equation
Authors: Chen Y H , Zhang L , Zhou J , Liu Z S 
Published: May 2024

Abstract
Soil-rock mixtures (SRMs) are widely utilized for embankment filling of highways in mountainous areas. The permeability characteristics of SRMs must be investigated as mountain highways are often exposed to strands of rainwater subjected to extreme rainfall. For the same species of SRM, its permeability is determined by its pore distribution and grading characteristics, which can be considered as an expression of particle grading and pore parameters. The predictive model of the SRMs permeability coefficient encompassing gradation coefficients and porosity was proposed based on the negative exponential continuous gradation equation and the Kozeny–Carman model. The applicability of the prediction model was verified based on the existing literature and performing SRMs seepage tests. The findings indicated that the permeability coefficient formula for SRMs established on the particle grading parameters and porosity was reasonable. Nevertheless, its current applicability is limited to the prediction of permeability coefficients for continuously graded SRMs. Consequently, further investigation is required to assess the suitability of the model for intermittently graded SRMs.
Centrifuge model tests on vertical stress distribution of geosynthetics reinforced soil (GRS) abutment
Authors: Wang Qingming , Xu Chao , Shen Panpan , Li Geye , Zhao Chongxi , Meng Ya 
Published: May 2024

Abstract
Geosynthetics reinforced soil (GRS) abutment has been widely used in the construction of small to medium single-span bridges and shows good service performance in engineering projects. Vertical stress distribution plays an important role for engineering design of the GRS abutments. Three centrifugal model tests of GRS abutments were carried out to investigate the vertical stress distribution underneath the centreline of beam seat, considering the setback distance (i.e., the distance from the beam seat to the inner of the facing) and beam seat width as influencing factors. Test results indicated the measured incremental vertical stresses under the beam seat increased with increasing loads uniformly and presented “larger on the upside and smaller on the downside” along the elevation. There existed the phenomenon of stress concentration near the top of the abutment and with the increasing beam seat width, the phenomenon of stress concentration presented more obvious. However, the setback distance had little effect on the vertical stress distribution. A comparison between measured and theoretical vertical stress showed that the AASHTO method provided a better prediction of the incremental vertical stress distribution than the FHWA method under the load of 200 kPa, but with the increasing loads, these two methods significantly underestimated the incremental vertical stress.
Experimental evaluation of one and two-directional wicking geotextile stabilized permeable base
Authors: Luo Leike , Guo Jun , Chen Aolong , Wen Wenhao 
Published: May 2024

Abstract
Incorporating wicking geotextiles significantly reduces the moisture levels in road bases under saturated and unsaturated conditions, improving the strength of granular materials and reducing water-related pavement damage. Despite the numerous well-documented applications of wicking geotextiles, most practical uses or research predominantly feature wicking fibers oriented in a single direction. Although theoretically incorporating multidirectional wicking fibers should enhance drainage efficiency, empirical studies on the impact of bidirectional fibers on geotextile drainage performance are scarce. A year-long comparative study was conducted in Shenzhen to examine the influence of fiber orientation. In this study, the moisture content in the aggregate base of a permeable sidewalk across three distinct test sections – single-directional, bidirectional, and no wicking geotextile – determined that two-directional wicking geotextiles are superior to their one-directional counterparts in reducing the volumetric water content in the granular base.
A rapid detection method for diesel content in diesel-contaminated soil based on dielectric measurement and oven-drying tests
Authors: Liu Zonghui , Lan Yinghao , Zhang Xiaolei , Zeng Fanzheng , Li Chuanghui 
Published: May 2024

Abstract
Geophysical testing techniques have been successfully applied to identify light non-aqueous phase liquids in soils, but challenges remain in rapidly detecting contaminant content. Detection of contaminants in soil using geophysical testing techniques relies on sensors sensitive to electrical and electromagnetic parameter changes. In this study, the complex permittivity of silty clay contaminated with 0# diesel was measured using an open-ended coaxial probe at frequencies from 200–3000 MHz, and the four-phase dielectric mixing models were evaluated. The measurement results showed that the complex refractive index method (CRIM) model provided a better match with the real permittivity of the four-phase system between 500–3000 MHz with relative errors within an acceptable range of 4%. To eliminate the unknown variable in the CRIM model, an improved equation for the relationship between water content and diesel content of the watery diesel-contaminated silty clay was established by the oven-drying method. Thus, a method for the rapid quantitative detection of the diesel content in contaminated soil has been developed based on dielectric measurement and oven-drying tests. The relative error between the calculated and actual set diesel content for ten manually configured diesel-contaminated soil samples was within 10%, with a maximum error of 15.75%.
An insight into laboratory column experiments for microplastic transport in soil
Authors: Gao Y , Sujathan S , El-Zein A 
Published: May 2024

Abstract
Plastic litter, most of which is landfilled or improperly disposed to aquatic and terrestrial environments, is a global environmental concern. Large-sized plastics can fragment into smaller pieces due to abrasion or weathering effects generating microplastics (MPs) which are tiny plastic debris smaller than 5 mm. In the aquatic environment, particularly oceans, MPs have been well documented in terms of their occurrence and toxicity. Soils have been shown to be an important sink of MPs, but the latter's fate and transport in the subsurface are not well understood. Laboratory studies have so far mostly employed rigid-wall columns to investigate MP transport through porous media, with a vast majority focusing on glass beads and predominantly sandy soils. Much less knowledge is available on MP transport in clay soils and minerals where transport mechanisms are much slower and the potential for chemical reactivity higher. There is hence a need for establishing experimental protocols for conducting such experiments. The paper presents preliminary results for an investigation assessing whether flexible wall permeameters (FWP) are suitable for the study of the transport of MPs in clayey soils. Key advantages of FWP are that they are widely available and commonly used and that they allow the control of effective stress in the sample. Two key questions addressed in this paper are whether the instruments themselves act as sink for MPs or as source of material that may interfere with the measurement of MPs in the effluent.
Influence of spatial variability in surrounding rock on fracture propagation in compressed air energy storage caverns
Authors: He X H , Zhou S W , Xu Y J , Qing S K 
Published: May 2024

Abstract
The expansion of fractures around underground caverns for compressed air energy storage (CAES) has a significant impact on engineering stability. We established a thermo-mechanical coupled random phase field model to investigate the trajectory of fractures in the heterogeneous surrounding rock of underground gas storage caverns. By simulating the different mechanical parameters under different coefficients of variation and autocorrelation distances, we explored the impact of spatial variability of rock mass on the fracture mode of surrounding rock in underground gas storage caverns. The results indicate that when only the spatial variability of elastic modulus is considered, the coefficient of variation primarily affects the inclination and curvature degree of fractures while the autocorrelation distance has a slight impact on the bending shape of fractures. When only the spatial variability of fracture energy release rate is considered, both the coefficient of variation and the autocorrelation distance have a negligible effect on fracture propagation. Compared with the elastic modulus of the rock mass, the fracture energy release rate has a more significant impact on the path of the cavern fractures.
Study on the mechanism of stone column pile formation
Authors: Cheng Z , Han S , Feng X , Zhang J , Wang F , Zhang D 
Published: May 2024

Abstract
This study focuses on the construction mechanism of stone column piles at an iron ore base in China. A theoretical model that describes the stone column pile formation process during sinking was proposed. The calculation formula for the air pressure required to open the pile tip valve during the pile formation process was derived according to the physical and mechanical parameters of the stratum, stone material parameters, and relevant dimensions of the pile tip valve. This ensured that the pile diameter satisfied the design requirements by successfully opening the pile tip valve. The required air pressure values for different pile lengths in the field were calculated based on this theoretical model, and they were found to be consistent with the actual field conditions. These results can serve as a reference for engineering projects.
Rigid inclusions performance as ground improvement for lacustrine clays
Authors: Colorado-Urrea G , Gonzalez Y D , Wang H , Zapata-Medina D , Carranza-Argote J 
Published: May 2024

Abstract
The Bogotá urban railway system involves constructing a rail maintenance yard covering 33 ha near the Bogotá River. It requires the construction of a 4.1 m embankment to overcome flood risks. Approximately 57,000 rigid inclusions (RI) were installed because of poor soil conditions to control excessive settlement. The embankment and RI were placed on a lacustrine deposit comprising layers with high organic matter content and soft clays that extended up to 200 m below ground surface. The effects of RI installation were reviewed using an inclinometer and benchmark data. Proof static load tests (SLT) and CPT were performed after RI installation to verify RI performance. CPTs were completed in the soil adjacent to the RI, as tested by the SLT. Different time spans were considered after RI installation for the CPT to assess the evolution of soil properties. The SLT uses the estimated working loads factored in by at least 20%. The CPT results showed that after a relatively short period of RI installation, the soil properties were similar to the initial properties. SLT results showed that RI capacity and head displacements were within the admissible ranges, considering that they had no competent bearing stratum, demonstrating the effectiveness of the ground improvement method. The results of both tests demonstrate the effectiveness of RI as a ground improvement technique for lacustrine soft clay in Bogotá.
Optimal screening method for dosage of calcium-based nanosilica modified expansive soils improver based on cost-effectiveness
Authors: Kang Bo , Zha Fusheng , Wang Jingwen , Pan Jun , Qin Lin 
Published: May 2024

Abstract
Under complex natural environments, the properties of lime-modified expansive soil may deteriorate. This facilitates the need for newer materials to develop composite modifiers to improve the anti-deterioration performance. Nanosilica (NS), which is a highly reactive material, is a good promoter of reaction systems with volcanic ash. In this paper, lime is mixed with NS according to a specified ratio to form calcium-based nanosilica (NS-C). NS-C significantly increased the unconfined compressive strength, cohesion, and internal friction angle and decreased the plasticity index, free swelling ratio, and permeability coefficient. The optimum ratio of nano-silica to lime in compound modifier was determined to be 1:8. NS can facilitate the production of a large amount of hydration products in the early stage of the reaction of stabilized soil, thus strengthening the connection between soil particles. In addition, NS exhibits good filling effect on the tiny pores between soil particles. The properties of NS-C stabilized soils with different ratios and curing times were determined to evaluate the modification effect and mechanism of composite modifier and obtain the optimal dosage for Hefei expansive soils in road-base edging technology. The optimum content of the compound modifier for expansive soils in the Hefei area should be 6 %, and the curing time should be at least 14 days.
Evaluation of earth retaining wall and adjacent underground structure behavior using 3D-FEM analysis
Authors: Kumagai Hiroto , Kono Takao , Nishiie Sho 
Published: May 2024

Abstract
Considering that excavation work in urban areas is often conducted close to the existing infrastructure, evaluating the impact of excavation on the surrounding area is crucial. Although step finite element method (FEM) analyses have been conducted to elucidate the behavior of the retaining wall and surrounding soil during excavation, evaluating the horizontal displacement of the retaining wall and the vertical displacement of the ground behind the retaining wall using linear elastic FEM analysis remains difficult. In this study, the behavior of the retaining wall and adjacent underground structure was evaluated by applying a three-dimensional elastoplastic step finite element method (FEM) analysis, in which the elastic modulus, considering the ground confining pressure and strain due to excavation, and the usefulness of setting the deformation coefficient were evaluated. The results indicated that the displacement behavior could be simulated using elastoplastic analysis, which sets the elastic modulus by considering the excavation effect for each region.
Analytical method for calculating internal forces and deformations in foundation pit support under asymmetric loading
Authors: Gu Kuanhai , Liu Fang 
Published: May 2024

Abstract
Sheet pile walls are significant forms of foundation pit supports that are widely employed in foundation pit support projects in combination with inner bracing. The complex geological conditions, surrounding environments, and earthwork excavations associated with foundation pits generally lead to noticeable asymmetric loading on a support system, posing challenges for accurately calculating the internal forces and deformations. To study the calculation methods for the internal forces and deformations in foundation pit support structures and bracing systems under asymmetric loading, a new model was established for foundation pits subjected to asymmetric unbalanced force loading on opposite sides. This method provides an adjusting technique for bracing forces on both sides based on the principle of equalizing axial forces, thereby providing a calculation approach for the stress and deformation of the foundation pit support system. Additionally, the developed axial force iterative calculation method was compared with numerical analysis methods to analyze the stress and deformation patterns in the support structure, which validated its effectiveness and accuracy.
Ultimate Lateral Resistance of Single Piles in Sand
Authors: Mu Linlong , Wang Shunwei , Huang Maosong 
Published: May 2024

Abstract
The p-y curve method is currently the most widely utilized analytical approach for horizontally loaded piles. Precisely determining the ultimate soil resistance is essential to enhance the accuracy of the p-y curve. Despite various scholars proposing methods to establish the law governing ultimate soil resistance with soil depth in the sand, significant discrepancies exist among these approaches. This paper posits that the three-dimensional failure mode of the shallow soil in front of the pile manifests as a cone when it reaches the limit state. The expression for the ultimate soil resistance of a single pile in shallow soil is derived through limit equilibrium theory, and subsequently, the modified p-y curve is obtained. The accuracy was validated through a comparison between the corrected p-y curve and results obtained from centrifugation experiments and field studies. In contrast to the API specification method, the refined hyperbolic function p-y curve demonstrates enhanced precision, facilitating precise predictions of pile head displacement and pile bending moments under horizontal loads.
Effect of sampling locations on reliability of pile groups
Authors: Zhang Yuting , Zou Di 
Published: May 2024

Abstract
Geotechnical site investigations represent an imperative prerequisite in the pursuit of reliable foundation designs. However, site investigations are frequently restricted to a limited number of locations owing to the constraints imposed by budget and time considerations, thereby potentially yielding a range of adverse consequences. Hence, the development of an efficient site investigation plan — one that optimally selects the number and location of tests, is important to gain adequate information for a given cost. This paper proposes a framework to identify optimal investigation locations by minimizing the probability of erroneous decisions (i.e., error types I and II). A pile group was adopted for the demonstration. The best locations corresponding to various numbers of tests were identified based on the derived probabilities of type I and II errors.
Improved CNN-based model for shape parameter determination of sand particles considering imbalanced dataset
Authors: Kim Donghwi , Youn Heejung 
Published: May 2024

Abstract
This study presents an artificial intelligence prediction model for determining the roundness and sphericity of sand particles using a convolutional neural network (CNN) regression model, which combines a CNN and a regression model. The dataset used for the model development consisted of 27,000 binary images of coarse grains with various shapes. To develop the prediction model, the validated algorithms, ResNet101 and ResNet152, were utilized and modified into a CNN regression model to predict the shape parameters. The performance of the developed model was evaluated using 3,000 randomly generated binary images, and the mean squared error and root mean squared error were calculated as evaluation metrics. The evaluation results indicated that the model effectively predicted the sphericity and roundness of sand particles, with a relatively low prediction performance observed for roundness.
Surrogate numerical prediction method of TBM position via FEM simulation and machine learning
Authors: Chang Jiaqi , Zhang Dongming , Huang Hongwei , Thewes Markus , Liu Xiaomin 
Published: May 2024

Abstract
The position of the tunnel boring machine (TBM) during tunnel construction is critical and must be precisely controlled. Owing to the geological uncertainty and complexity of the interaction between the ground and the TBM, controlling the position of the TBM is challenging. Hence, a surrogate numerical method is proposed to predict the position of the TBM using the finite element method (FEM) and machine learning method. First, a refined three-dimensional FEM model was established. Different values of the property parameters of the ground and the thrust force of the TBM were input into the FEM model, generating a database that includes 1000 cases. Subsequently, the database is used to train a gradient boosting regression (GBR) model. The GBR model learns from the database and establishes the relationship between the construction parameters, ground parameters, and TBM position as a surrogate model. The surrogate model exhibited high accuracy on the test set. With a geological survey and a construction parameter monitoring system, the TBM position could be predicted quickly and precisely using a surrogate model. The construction parameters were adjusted if the TBM position did not satisfy the requirements.