Article
Construction & Building Technology
Yaocai Ma, Aizhong Lu, Hui Cai, Xiangtai Zeng
Summary: An analytical solution is proposed for studying the plastic zones developed around two circular tunnels with unequal size excavated in intact rock governed by the Mohr-Coulomb yield criterion. The solution involves the use of conformal transformation to map the elastic-plastic interfaces on the physical plane onto an annulus on the image plane. A set of nonlinear equations involving mapping function coefficients is constructed, and the differential-evolution algorithm is used to solve these equations.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2022)
Article
Construction & Building Technology
Qing Ai, Yong Yuan, Xiaomo Jiang, Hui Wang, Chanjuan Han, Xingchun Huang, Kun Wang
Summary: In this study, a pathological diagnosis method was proposed to quantitatively sort the influencing factors and conduct a risk analysis of the seepage of a mountain tunnel. The importance of the influencing factors was determined and the failure risk of seepage was predicted. The proposed method was validated based on real data, and the results provided insights into the importance of different factors and the future development of seepage.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2022)
Article
Geochemistry & Geophysics
An Gang-jian, Cao Zheng-zheng, Duan Hong-fei, Li Guo-sheng, Li Ao
Summary: In this study, a new damage constitutive mechanical model of the surrounding rock of a karst tunnel under the stress-damage-seepage coupling effect was established. The research findings provide an important theoretical basis for the prediction and treatment of dynamic disasters in karst tunnels.
Article
Materials Science, Multidisciplinary
Pinxiang Liao, Hailang Wan, Junying Min, Kai Zhang, Jianping Lin
Summary: This article investigates the temperature evolution of AA6061-T6 during the flow drill riveting process and its effects on joint quality. The results show that friction stir is the main factor contributing to temperature rise, and rotation speed and feed rate have significant influences on temperature evolution and the size of the heat-affected zone. Higher rotation speed and larger feed rate result in higher temperatures and larger heat-affected zones, leading to greater softening effects on the upper workpiece and reduced joint strength.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Review
Construction & Building Technology
Ruishan Cheng, Wensu Chen, Hong Hao, Jingde Li
Summary: Understanding the performance of road tunnels under explosion loads is crucial for a reliable blast-resistant design of tunnel structures. Research on dynamic response, damage assessment, and damage mitigation are essential in this field.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2021)
Article
Engineering, Mechanical
Longlong Chen, Yaqiong Wang, Zhi-Feng Wang, Feifei Fan, Yong Liu
Summary: This paper analyzes the collapse characteristics and mechanism of a tunnel in Wenzhou in a fault fracture zone during rainfall. The study uses the failure theory of surrounding rock, three-dimensional discrete element numerical simulation, and in-situ deformation monitoring. The continuous erosion and expansion of rock fissures caused by water seepage are identified as the main reason for the reduction of surrounding rock stability. Treatment measures such as grouting and pipe-roofing are adopted and the reinforcement effect is evaluated through monitoring.
ENGINEERING FAILURE ANALYSIS
(2023)
Article
Engineering, Environmental
Ziquan Chen, Zihan Zhou, Chuan He, Changwei Jiang, Bo Wang, Tiansheng Li
Summary: As China's transportation infrastructure expands westward, the construction of superlong deep-buried tunnels becomes more common in an area with active tectonic movements. However, the effects of faults formed by these movements on the distribution of geo-stress have not been studied systematically. This paper analyzes the disturbance influence of different factors using the Anderson model and Coulomb friction criterion, and establishes a viscoelastic-plastic damage constitutive model. The results show that all types of faults lead to a decrease in geo-stress within the fault-affected area, with strike-slip faults having the greatest effect.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2023)
Article
Geochemistry & Geophysics
Xiaoding Xu, Yuejin Zhou, Chun Zhu, Chunlin Zeng, Chong Guo
Summary: This paper presents a model to predict the formation and evolution of the excavation damage zone (EDZ) in surrounding rock of deep-buried tunnels. The model takes into account the stress characteristics of the tunnel surrounding rock and considers the effects of strain softening and dilatancy during rock deformation. Sensitivity analysis is also performed to examine the influence of different factors in the model. The results provide valuable references for future numerical and experimental studies.
Article
Engineering, Civil
Milad Zaheri, Masoud Ranjbarnia
Summary: A closed-form solution is presented to determine induced stresses and deformations near circular tunnels, taking into account the altered zone around the tunnel and the self-weight of different zones. The Mohr-Coulomb criterion and elastic-brittle-plastic model are used to analyze the altered zone and initial rock mass, showing that the damaged and reinforcement zones cannot be neglected in considering the propagation of plastic radii.
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING
(2022)
Article
Construction & Building Technology
Enjie Su, Xingbing Zhang, Xiaobao Wen, Jia Liu, Fei Ye, Xingbo Han, Pengfei Lei
Summary: To improve driving safety in extra-long highway tunnels, a gradual landscape zone is proposed in this study to reduce the discomfort caused by the sharp contrast between the landscape and ordinary zones. Through driving simulation tests, it was found that the blue sky and white clouds landscape zone in the tunnel vault has no excessive distraction risk for drivers. The length of the gradual landscape zone in the approach direction significantly affects the change rate of drivers' pupil diameter range, while the gradual landscape zone in the driving direction has little influence.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2023)
Article
Engineering, Chemical
Chengshan Wang, Wenbin Lu, Zongyan Zhou
Summary: This study employed a novel potential flow model to predict the profile of different flow zones in an ironmaking blast furnace and verified the results with experiments. The model has the advantage of simultaneously predicting stagnant and flowing zones without the need for complicated correlations.
Article
Geochemistry & Geophysics
Keishi Okazaki, Eric Burdette, Greg Hirth
Summary: The study investigates the rheology of quartz with different fluid fractions in the brittle-plastic transition zone (BPT) near plate boundaries. Results show that the presence of fluid-filled porosity significantly weakens shear zones, and that variations in fluid fraction (along with temperature) explain transitions in slip behaviors along plate boundaries. The study helps to understand the mechanisms behind large earthquakes and slow slip events occurring along plate boundaries.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Engineering, Environmental
Y. Fan, J. W. Zheng, X. Z. Cui, Z. D. Leng, F. Wang, C. C. Lv
Summary: This study analyzed the influence of stress unloading paths on the excavation damage zone (EDZ) in deep tunnel excavation using acoustic data analysis and numerical simulation. The results showed that transient unloading amplifies stress effects in surrounding rock masses, resulting in greater depths of the EDZ in blasting excavation tunnels compared to TBM excavation tunnels.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2021)
Article
Engineering, Geological
Guopeng Lyu, Chuanbo Zhou, Nan Jiang
Summary: This study investigates the damage characteristics and distribution of grouted surrounding rock induced by tunnel blasting through ultrasonic testing and numerical simulation analysis. The results show that there is a certain pattern in the depth and degree of damage to the surrounding rock along the tunnel cross-section. Based on the findings, recommendations for reinforcement are proposed.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Environmental Sciences
Nana Xue, Qunkai Fang, Xiangliang Pan, Daoyong Zhang
Summary: The study revealed significant differences in the fungal plastisphere structure on plastic debris in different functional zones of an urban river, with human activities having considerable effects on these fungal communities.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Geological
Mohammad Reza Zareifard, Ahmad Fahimifar
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2015)
Article
Engineering, Civil
Mohammad Reza Zareifard, Ahmad Fahimifar
KSCE JOURNAL OF CIVIL ENGINEERING
(2016)
Article
Construction & Building Technology
Mohammad Reza Zareifard, Ahmad Fahimifar
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2016)
Article
Engineering, Multidisciplinary
Mohammad Reza Zareifard
APPLIED MATHEMATICAL MODELLING
(2018)
Article
Engineering, Geological
Ahamad Fahimifar, Mohammad Reza Zareifard
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2013)
Article
Engineering, Civil
Ahmad Fahimifar, Mohammad Reza Zareifard
STRUCTURE AND INFRASTRUCTURE ENGINEERING
(2014)
Article
Construction & Building Technology
Ahamad Fahimifar, Mohammad Reza Zareifard
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2009)
Article
Engineering, Civil
Mohammad Reza Zareifard
Summary: This paper presents an analytical-numerical solution of the ground response curve for a tunnel considering gravitational loading, using specific yield criterion and plastic potential function for the ground medium, and introducing flexible and inflexible lining theories. The derived differential equations are solved using finite difference approximations, and illustrative examples demonstrate the effects of gravity loading on tunnel convergence. Results show that gravity loads may affect tunnel convergence, especially in wide plastic regions.
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING
(2021)
Article
Computer Science, Interdisciplinary Applications
Mohammad Reza Zareifard
COMPUTERS AND GEOTECHNICS
(2020)
Article
Engineering, Geological
Mohammad Reza Zareifard
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2020)
Article
Engineering, Marine
Mohammad Reza Shekari, Seyed Mehrab Amiri, Mohammad Reza Zareifard
Summary: A submerged floating tunnel (SFT) is proposed as an alternative to conventional bridges and tunnels for crossing deep waterways. Limited research has been done to analyze the importance of seaquake effects on SFTs. This paper numerically simulates the dynamic response of an SFT system under bidirectional earthquake actions and confirms the significance of input seismic excitation characteristics.
Article
Engineering, Multidisciplinary
Soleiman Ghoohestani, Mohammad Reza Shekari, Mohammad Reza Zareifard, Seyyed Mehrab Amiri
Summary: This study analyzes two base isolation systems and compares their seismic applicability with a liquid-filled elevated container. The effects of various parameters on the efficiency of the seismic bilinear hysteretic members are examined through finite element analysis. The results suggest that the earthquake response spectrum plays a crucial role in the performance of the elevated containers.
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2022)
Article
Engineering, Geological
Mohammad Reza Zareifard
GEOTECHNICAL AND GEOLOGICAL ENGINEERING
(2020)
Article
Engineering, Geological
Mohammad Reza Zareifard, Ahmad Fahimifar
ACTA GEOTECHNICA SLOVENICA
(2012)
Article
Engineering, Multidisciplinary
A. A. Aganin, A. I. Davletshin
Summary: A mathematical model of interaction of weakly non-spherical gas bubbles in liquid is proposed in this paper. The model equations are more accurate and compact compared to existing analogs. Five problems are considered for validation, and the results show good agreement with experimental data and numerical solutions. The model is also used to analyze the behavior of bubbles in different clusters, providing meaningful insights.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Hao Wu, Jie Sun, Wen Peng, Lei Jin, Dianhua Zhang
Summary: This study establishes an analytical model for the coupling of temperature, deformation, and residual stress to explore the mechanism of residual stress formation in hot-rolled strip and how to control it. The accuracy of the model is verified by comparing it with a finite element model, and a method to calculate the critical exit crown ratio to maintain strip flatness is proposed.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Shengwen Tu, Naoki Morita, Tsutomu Fukui, Kazuki Shibanuma
Summary: This study aimed to extend the finite element method to cope with elastic-plastic problems by introducing the s-version FEM. The s-version FEM, which overlays a set of local mesh with fine element size on the conventional FE mesh, simplifies domain discretisation and provides accurate numerical predictions. Previous applications of the s-version FEM were limited to elastic problems, lacking instructions for stress update in plasticity. This study presents detailed instructions and formulations for addressing plasticity problems with the s-version FEM and analyzes a stress concentration problem with linear/nonlinear material properties.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Bo Fan, Zhongmin Wang
Summary: A 3D rotating hyperelastic composite REF model was proposed to analyze the influence of tread structure and rotating angular speed on the vibration characteristics of radial tire. Nonlinear dynamic differential equations and modal equations were established to study the effects of internal pressure, tread pressure sharing ratio, belt structure, and rotating angular speed on the vibration characteristics.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
X. W. Chen, Z. Q. Yue, Wendal Victor Yue
Summary: This paper examines the axisymmetric problem of a flat mixed-mode annular crack near and parallel to an arbitrarily graded interface in functionally graded materials (FGMs). The crack is modeled as plane circular dislocation loop and an efficient solution for dislocation in FGMs is used to calculate the stress field at the crack plane. The analytical solutions of the stress intensity factors are obtained and numerical study is conducted to investigate the fracture mechanics of annular crack in FGMs.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Xumin Guo, Jianfei Gu, Hui Li, Kaihua Sun, Xin Wang, Bingjie Zhang, Rangwei Zhang, Dongwu Gao, Junzhe Lin, Bo Wang, Zhong Luo, Wei Sun, Hui Ma
Summary: In this study, a novel approach combining the transfer matrix method and lumped parameter method is proposed to analyze the vibration response of aero-engine pipelines under base harmonic and random excitations. The characteristics of the pipelines are investigated through simulation and experiments, validating the effectiveness of the proposed method.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Xiangyu Sha, Aizhong Lu, Ning Zhang
Summary: This paper investigates the stress and displacement of a layered soil with a fractional-order viscoelastic model under time-varying loads. The correctness of the solutions is validated using numerical methods and comparison with existing literature. The research findings are of significant importance for exploring soil behavior and its engineering applications under time-varying loads.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Thuy Dong Dang, Thi Kieu My Do, Minh Duc Vu, Ngoc Ly Le, Tho Hung Vu, Hoai Nam Vu
Summary: This paper investigates the nonlinear torsional buckling of corrugated core sandwich toroidal shell segments with functionally graded graphene-reinforced composite (FG-GRC) laminated coatings in temperature change using the Ritz energy method. The results show the significant beneficial effects of FG-GRC laminated coatings and corrugated core on the nonlinear buckling responses of structures.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Zhihao Zhai, Chengbiao Cai, Qinglai Zhang, Shengyang Zhu
Summary: This paper investigates the effect of localized cracks induced by environmental factors on the dynamic performance and service life of ballastless track in high-speed railways. A mathematical approach for forced vibrations of Mindlin plates with a side crack is derived and implemented into a train-track coupled dynamic system. The accuracy of this approach is verified by comparing with simulation and experimental results, and the dynamic behavior of the side crack under different conditions is analyzed.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
James Vidler, Andrei Kotousov, Ching-Tai Ng
Summary: The far-field methodology, developed by J.C. Maxwell, is utilized to estimate the effective third order elastic constants of composite media containing random distribution of spherical particles. The results agree with previous studies and can be applied to homogenization problems in other fields.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Kim Q. Tran, Tien-Dat Hoang, Jaehong Lee, H. Nguyen-Xuan
Summary: This study presents novel frameworks for graphene platelets reinforced functionally graded triply periodic minimal surface (GPLR-FG-TPMS) plates and investigates their performance through static and free vibration analyses. The results show that the mass density framework has potential for comparing different porous cores and provides a low weight and high stiffness-to-weight ratio. Primitive plates exhibit superior performance among thick plates.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Bence Hauck, Andras Szekrenyes
Summary: This study explores several methods for computing the J-integral in laminated composite plate structures with delamination. It introduces two special types of plate finite elements and a numerical algorithm. The study presents compact formulations for calculating the J-integral and applies matrix multiplication to take advantage of plate transition elements. The models and algorithms are applied to case studies and compared with analytical and previously used finite element solutions.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Wu Ce Xing, Jiaxing Wang, Yan Qing Wang
Summary: This paper proposes an effective mathematical model for bolted flange joints to study their vibration characteristics. By modeling the flange and bolted joints, governing equations are derived. Experimental studies confirm that the model can accurately predict the vibration characteristics of multiple-plate structures.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Pingchao Yu, Li Hou, Ke Jiang, Zihan Jiang, Xuanjun Tao
Summary: This paper investigates the imbalance problem in rotating machinery and finds that mass imbalance can induce lateral-torsional coupling vibration. By developing a model and conducting detailed analysis, it is discovered that mass imbalance leads to nonlinear time-varying characteristics and there is no steady-state torsional vibration in small unbalanced rotors. Under largely unbalanced conditions, both resonant and unstable behavior can be observed, and increasing lateral damping can suppress instability and reduce lateral amplitude in the resonance region.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Yong Cao, Ziwen Guo, Yilin Qu
Summary: This paper investigates the mechanically induced electric potential and charge redistribution in a piezoelectric semiconductor cylindrical shell. The results show that doping levels can affect the electric potentials and mechanical displacements, and alter the peak position of the zeroth-order electric potential. The doping level also has an inhibiting effect on the first natural frequency. These findings are crucial for optimizing the design and performance of cylindrical shell-shaped sensors and energy harvesters.
APPLIED MATHEMATICAL MODELLING
(2024)