bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study on Ground Deformation Law of Small Spacing Shield Tunneling in Sand and Rock Composite Stratum
Authors: Deng Liwen , Pan Jianting , Ye Haolin , Zeng Jinming , Lu Hao , Pan Hong 
Published: June 2023

AbstractThe construction of shield tunnel often occurs in composite stratum, so it is of great significance to study the law of surface deformation under the working condition of composite stratum in order to ensure the safety of shield construction. Based on the actual tunnel engineering, the law of ground surface soil deformation caused by shield construction in the composite stratum of upper sand and lower rock is studied by using the method of field measurement. The results show that: The width coefficient of the surface settlement trough basically remains stable with the shield construction, and the stratum loss rate changes exponentially with the shield construction; Affected by the disturbance of the previous shield construction, the surface settlement trough caused by the subsequent shield construction is no longer on the top of the tunnel axis, and will move with the construction process, which is greatly affected by the shield attitude parameters; Taking into account the conditions of the center movement of the settlement trough of the subsequent tunnel, the total surface settlement caused by the successive shield constructions adopts the modified Mark-bolt formula to make the fitting parameters of the settlement trough more suitable for reality.
Analysis of Blasting Vibration Signals at Different Initiation Positions of Tunnel Blastholes
Authors: Yan Zhihao , Wang Genzhong , Gao Wenxue , Zhou Min , Hu Wangjing , Ye Jin , Li Yanping , Xie Yuelan , Hu Yu , Zhang Xiaojun 
Published: June 2023

AbstractIn order to study the blasting vibration effect of different blasting points of the tunnel bore, the pilot tunnel in multi-arch tunnel was used to carry out the test of different blasting points of the bore. The results show that: 1) the peak velocity generated by blasting at different initiation points of the hole is different, and the magnitude of the peak velocity is reverse initiation > Intermediate initiation > Forward initiation; 2) The frequency distribution range of blasting vibration signal under the three initiation positions is: forward initiation > Reverse initiation > Intermediate initiation; At the same time, forward initiation is more conducive to the main frequency of blasting vibration signal moving to high frequency; 3) Compared with reverse initiation and intermediate initiation, forward initiation can better disperse energy, so that the energy is transferred from low frequency to high frequency, so that the blasting vibration is relatively small, which is more conducive to the safety of tunnel lining structure.
Experimental Investigation on the Factors Influencing the Shear Strength of Loess-Mudstone Composite Layer
Authors: Zhou Xiaodong , Wang Tienan , Xu Bowen 
Published: June 2023

AbstractGeological slopes are often disturbed by external engineering, leading changes of the upper moisture content and dry density in loess-mudstone composite layer. It directly affects the shear strength of the loess-mudstone composite layer interface. In order to explore the influence of the upper loess moisture content and dry density on the shear strength of the loess-mudstone composite layer, taking the cutting slope in a test base in Shaanxi Province as the engineering background, different loess moisture contents (10%, 13%, 16%, 19%) and dry densities (1.4, 1.45, 1.5, 1.55 g/cm3) are employed to investigate the shear strength of loess-mudstone composite layers. Scanning electron microscopy (SEM) is used to observe the failure interface of the loess-mudstone composite layer to analyze the failure mechanism of the samples. The results show that: (1) The shear strength of the loess-mudstone composite layer is lower than those of pure loess and mudstone samples. (2) The moisture content of loess will deteriorate the shear strength of the composite layer, and its effect is greater than that of homogeneous loess; but the dry density of loess will enhance the shear strength of the composite layer, and its effect is less than that of homogeneous loess (3) The moisture content and dry density of loess will affect the distribution of pores in the composite layer interface, changing the shear strength of the composite layer. The research can provide certain data and theoretical basis for the prevention and control of landslides at the loess-mudstone interface.
Compaction Effect Due to Single Pile Driving in PHC Pile Treated Soft Clayey Deposit
Authors: Li Guowei , Liu Ruyi , Zhao Chao , Zhou Yang , Xiong Li 
Published: June 2023

AbstractThe compaction effect of extra-long prestressed high-strength concrete (PHC) piles in deep soft soil foundation was studied by field test. The pore water pressure gauge, inclinometer were embedded in different plane positions or different depths of the foundation to monitor the pore pressure and deformation of the foundation when driving pile. The research shows that the magnitude of excess pore water pressure caused by single pile installation is mainly related to buried depth of the measuring point and the linear distance between the pile tip and the measuring point. The shorter the distance or the deeper the depth is, the greater the excess pore pressure caused by pile installation. The horizontal influence radius of pile compacting on the pore water pressure is about 10.7 m. The excess pore pressure induced by pile installation increases with depth, and is obviously affected by stratum properties. In the vicinity of soil with high permeability coefficient, such as thin sand layer or silty fine sand layer, the excess pore pressure cannot be accumulated in a large amount. The existing subgrade obviously restricts the lateral deformation of soil between piles and PHC piles. The pile deformation is small at the top and bottom, and large in the middle. The inflection point of the deformation curve appears at the pile connection position. The relationship the excess pore pressure of the measuring point with the depth and distance of the measuring point is given.
Seismic Data Denoising Analysis Based on Monte Carlo Block Theory
Authors: Jiang Hongliang , Lu Chaobo , Xiong Chunfa , Ran Mengkun 
Published: June 2023

AbstractDenoising of seismic data has always been an important focus in the field of seismic exploration, which is very important for the processing and interpretation of seismic data. With the increasing complexity of seismic exploration environment and target, seismic data containing strong noise and weak amplitude seismic in-phase axis often contain many weak feature signals. However, weak amplitude phase axis characteristics are highly susceptible to noise and useful signal often submerged by background noise, seriously affected the precision of seismic data interpretation, dictionary based on the theory of the monte carlo study seismic data denoising method, selecting expect more blocks of data, for more accurate MOD dictionary, to gain a higher quality of denoising of seismic data. Monte carlo block theory in this paper, the dictionary learning dictionary, rules, block theory and random block theory is example analysis test, the dictionary learning algorithm based on the results of three methods to deal with, and the numerical results show that the monte carlo theory has better denoising ability, the denoising results have higher SNR, and effectively keep the weak signal characteristics of the data; In terms of computational efficiency, the proposed method requires less time and has higher computational efficiency, thus verifying the feasibility and effectiveness of the proposed method.
Comfort Behavior of High Performance Floor Based on Single-Jump Excitation Mode Considering Time–Space Effect
Authors: Yu Jiang , Xu Haifeng , Zhang Weiyun 
Published: June 2023

AbstractBecause the traditional analysis methods cannot directly describe the comfort behavior of high performance floor through the dimensions of time and space, this paper presents a new method to derive Dirac delta functions and governing differential equations to assess its comfort behavior. On the basis of this, an improved single-jump excitation model is proposed for comfort behavior analysis. In addition, the paper analyzes distribution characteristic of sensitive parameters for the high performance floor. The results show that the peak acceleration is concentrated in the middle of the high performance floor, and then the acceleration response gradually weakened to the two sides, and its degree of weakening is greater along the two corners of the floor model from its spatial and temporal distribution characteristics. In future, it is recommended to change the strength grade of concrete materials to improve its comfort behaviors. The study also demonstrates the strong applicability of improved single-jump excitation model as an effective approach to analyzing the comfort behavior of high performance floor.
Application of Ununiform Arrangement Piling in Reinforcement and Correction of Existing Structures
Authors: Zhou Shengbin , Tong Jianxing , Li Xu , Sun Xunhai , Wang Yahui , Li Jialu , Cao Guoqiang , Li Zhao 
Published: June 2023

AbstractDue to the construction problem of the original concrete mixing pile, the inclined settlement of a building occurred. After analysis and calculation, the uneven pile distribution in the north and south region is adopted to reduce the subsidence and correct the deviation. According to the comparison between the calculated results and the measured data of the project, the two are basically consistent, which indicates that the method of uneven pile distribution can successfully adjust the distribution of the reaction force of the base and achieve the effect of subsidence reduction and deviation correction.
Model Testing Technique for Piles in Soft Rock Considering the Overlying Layers
Authors: Liu Meiqi , Li Guirong , Wu Kunming , Wang Yuheng , Zhang Xiaosen , Huang Bin 
Published: June 2023

AbstractModel test is a common method to study the bearing peculiarity of pile foundation. The influence of overlying soil thickness and overburden pressure on the bearing capacity of soft rock-socketed pile should be considered in the physical model test of mini piles in soft rock. In this paper, the influence of coverage on the bearing characteristics of rock-socketed sections is studied by finite element analysis, and the modelling method of equivalent overburden pressure is proposed. This method can be used to study the carrying peculiarity of soft rock-socketed pile and reveal the failure mechanism of pile tip. The development of pile model test technology considering overburden pressure promotes more scientific design methods for pile foundation.
Computer-Vision-Based Structure Shape Monitoring of Bridges Using Natural Texture Feature Tracking
Authors: Zhu Weizhu , Chu Xi , Duan Xin 
Published: June 2023

AbstractStructural health monitoring is carried out for a limited number of measuring points of the bridge. The root of the problem of bridge damage identification is that the mechanical equation inversion result is not unique due to the incomplete measured data. The full-field description ability of digital images to the structural shapes can effectively alleviate the problem of damage identification caused by incomplete measured data. This project aims to research the full-field shape monitoring method of the bridge. Firstly, the mathematical representation of the corresponding image points on the bridge surface is formed by using the image feature extraction method. Analyze the feature points position change mathematical model before and after deformation, and propose the structural full-field displacement vector calculation theory. Verify the full-field displacement calculation theory by a test beam. The results show that the maximum absolute error of the vector length is 0.24 mm and the relative error is less than 5%. The research realizes the structural full-field displacement monitoring under the natural texture condition for the first time. The results can promote the application and development of digital image processing technology in the field of structural health monitoring, improve the level of bridge safety evaluation, and realize the automation, intelligence and visualization of structural deformation monitoring.
Study on High Temperature Performance of Asphalt Mixture and Correlation of Its Evaluation Indexes
Authors: Lv Dongbin , Zhang Honggang , Zeng Lihao , Lei Jiechao 
Published: June 2023

AbstractIn order to better evaluate the high-temperature performance of asphalt mixture, based on the conventional rutting test and Hamburg rutting test, this paper further studies the influence of temperature, grading and asphalt type on the high-temperature shear resistance of asphalt mixture by using uniaxial penetration test and uniaxial compression test. Based on Mohr Coulomb theory, the cohesive force and internal friction angle of mixture were calculated. Based on the analysis of variance, the significance of the influence of temperature and gradation on the high-temperature shear characteristics was studied. Linear regression analysis was used to reveal the correlation between the fractal dimension treated gradation and the shear resistance characteristics. Finally, the correlation between the high-temperature shear resistance performance index and the high-temperature rutting resistance evaluation index was analyzed. The results show that temperature has a significant effect on cohesion and internal friction angle of gradation pairs, and the fractal dimension Dc of coarse aggregate is positively correlated with cohesion and internal friction angle, with the strongest correlation. It indicates that the high-temperature performance of the mixture can be improved by increasing the passing rate of the sieve hole above 4.75 mm in the grading design. The correlation R2 between cohesive force index and high-temperature rutting resistance index of mixture at 35 ℃ is higher than 0.9, which belongs to extremely strong correlation. The shear resistance index of cohesion at 35 ℃ can be used to characterize the high-temperature rutting resistance of asphalt mixture.
Finite Element Analysis of Self-centering Reinforced Concrete Shear Walls
Authors: Yagoub Nouraldaim F. A. , Wang Xiuxin 
Published: June 2023

AbstractPost-tensioned precast concrete walls are an attractive research trend in structural engineering, which replaces cast-in-place concrete walls in earthquake-prone buildings. Precast concrete walls use mild steel and high-strength post-tensioning steel for flexural resistance. Mild steel reinforcement yields in tension and compression, dissipating inelastic energy. Unbounded tendons are used inside the wall to give self-centering capability, which lowers residual displacements. At the wall-foundation, horizontal slots are installed equally. Meanwhile, the middle-wall concrete is still anchored to the base. A three-dimensional finite element (FE) model is developed in this study to assess the lateral load response of shear walls with horizontal bottom slots. The seismic performance of three distinct walls is evaluated using the Abaqus software FEA. The model is validated by comparing the experimental data accessible in the literature. Furthermore, we investigate the effects of bottom slit length, steel strand position, initial prestressing level, and concrete strength. All of these criteria are critical for constructing structures with the new concept. The results of this study show that the three-dimensional finite element model accurately predicts all of the above-mentioned properties, including the lateral force–displacement response and toe area damage of self-centering shear walls.
Nonlinear Dynamic Behaviour of Hollow Piles Based on Axial Harmonic Loading
Authors: Sharma Surya Prakash , Choudhary Shiva Shankar , Burman Avijit 
Published: June 2023

AbstractThe main objective of the current work is to examine the dynamic axial response of three pile group under machine-based harmonic loads. Field tests are carried out under axial harmonic excitations on a group pile with a pile length of 300 cm and an diameter of 11.4 cm in order to accomplish this objective. For various eccentric moments, the frequency versus amplitude responses of the group pile are measured. The field test results of the soil-pile system show non-linear behaviour as their resonant frequencies decrease and their resonant amplitudes disproportionally increase with eccentric forces. The inverse methodology proposed by Novak (1971) is used for the theoretical study. With this methodology, the changes in stiffness, damping, and effective mass of the piles under various eccentric moments are quantified by analyzing the frequency-amplitude response curves of field results. The theoretically back-calculated soil-pile system response curves are compared with the field results, and it is observed that the analytically predicted responses closely match the field responses. It is also found that the values of estimated damping of the pile group increased, while effective mass and average stiffness values decreased with an increase in eccentric moments.
Research on Construction Method of Soft Soil Foundation Pit with L-Shaped Small Steps
Authors: Cao Yanhui , Ye Jinhua , Hao Gang 
Published: June 2023

AbstractA layered, segmented, and block building technique was created during the construction of the cut-and-cover foundation pit. Traditional foundation pit excavation often necessitates both support erection and mechanical excavation at the same time, however owing to the intersection of support and excavation mechanical operation, which may decrease building efficiency, and the construction requirements are higher due to the low mechanical characteristics of the soil in the silty soil layer. Therefore, the construction method of an L-shaped short step with small steps soft soil foundation pit is proposed, based on the mechanical characteristics of the silty soil layer and the construction operation characteristics of the foundation pit. After excavation, the support is erected using a numerical calculation of the stability of the foundation pit. According to engineering practice, the L-shaped short step with small steps soft soil foundation pit building technique can significantly facilitate basement pit deformation, improve construction efficiency, and be popularized.
Study on Structural Performance and Design Method of Rectangular Steel Plate Water Tank
Authors: Tang Gan , Jia Zelong , Li Peng , Ye Ziheng , Dou Junchun 
Published: June 2023

AbstractAccording to the engineering requirements of the integrated sewage treatment equipment, the structural design of the steel plate water tank used in the integrated sewage treatment equipment is carried out. Based on the investigation of actual projects and theoretical analysis, proposed the failure mode of steel plate water tank structure and the corresponding design guidelines. The finite element modeling calculation of the steel plate water tank project example is carried out to obtain the calculation results of the stress–strain level and displacement of the water tank structure under the stress state, so as to analyze the structural performance of the steel plate water tank structure and judge whether the water tank structure reaches the failure state accordingly. According to the design guidelines to adjust the structural arrangement and member size to ensure the safety of the water tank structure in the process of use, providing design methods for the design of steel plate water tank structure.
Numerical Evaluation of Punching Shear Capacity Between Bonded and Unbonded Post-tensioned Slab Using Inverted-U Shape Reinforcement
Authors: Khatib Milad , Saleh Zaher Abou 
Published: June 2023

AbstractThe Both bonded and unbonded prestressing tendons may be used to reinforce post-tensioned (PT) concrete members. The binding state of tendons may have an impact on how well different types of PT concrete elements function in flexural and shear loads. Inverted-U shape reinforcement was used experimentally to enhance the behavior of different structural elements. The obtained results confirmed the proposed model’s accuracy for both PT slabs and beams (bonded, and unbonded). This study's major goal is to compare numerically PT concrete slabs provided with inverted-U shape reinforcement with the two different tendon systems and evaluate their performances due to applying punching shear load. To do this, the PT slab that has already been tested is reexamined numerically. By using, a nonlinear finite element, the results were carried out utilizing visualization tools. For a better study of the behavior of bonded and unbonded PT slabs, the obtained numerical results, and the previous experimental one are compared. Good correlations are shown.
Analysis of the Effect of the Deep Excavation of a High-Rise Building on the Deformation of the Ground Surface and Diaphragm Wall
Authors: Nguyen Hong Nam 
Published: June 2023

AbstractStudy on the influence of the deep excavation by top-down construction method on the deformation of the adjacent ground surface and diaphragm wall has been analyzed in detail for a deep foundation pit of a high-rise building at 27 Lang Ha, Hanoi. The analysis was implemented by the finite element method. The influencing factors such as wall stiffness, wall depth, ground surface load, and initial groundwater level were carefully investigated by applying a parametric study, taking two cases of short-term and long-term working conditions. The simulated results show that the settlement of the ground surface adjacent to the deep excavation depends significantly on the surface load and the initial groundwater level. Under the long-term condition, the calculated ground surface settlement has a larger value than that under the short-term condition. The simulated horizontal displacement and the bending moment of the diaphragm wall depends significantly on the initial groundwater level and the large surface load.
Investigation on Contact Force for Asphalt Mixture During Compaction Using DEM
Authors: Feng Jian , Liu Weidong , Lei Jiechao 
Published: June 2023

AbstractContact force for asphalt mixture has a significant effect on mechanical properties, and discrete element method (DEM) is a feasible and efficient numerical simulation approach to investigate on skeleton structure of asphalt mixture from microscopic perspective. A three-dimensional (3D) DEM compaction model which can well describe morphology characteristics of mineral aggregate, compaction temperature, was established to investigate the contact force. It indicates that aggregate–aggregate (A-A) merely exists in contact pressure force, aggregate–mortar (A-M) and mortar–mortar (M-M) exists in contact pressure force and tension force. While contact force of two-dimensional (2D) sections is employed to characterize the contact force of 3D specimens, it needs to investigate rationality of the selected section. The 3D DEM compaction model can be utilized to investigate contact force for asphalt mixture.
Research on Carbon Footprint Calculation and Evaluation in Assembled Building Phase
Authors: Zhao Miaomiao , Zhu Jiwei , Han Pengwei , Liu Chengling 
Published: June 2023

AbstractThis study takes the carbon footprint of prefabricated buildings as the research object, and divides its physical and chemical process into four stages: building materials mining (production), prefabricated component production, material transportation and on-site construction. According to the carbon footprint sources of each stage, a carbon footprint model is established, and the carbon footprint factors and consumption factors required in the model are analyzed. Build a three-dimensional model based on BIM technology, and convert the consumption in combination with the project consumption quota to provide a data basis for calculation. The carbon footprint concentration produced in each stage of prefabricated buildings and cast-in-place buildings is analyzed by cases, and corresponding countermeasures and suggestions are put forward.