Article
Multidisciplinary Sciences
Shaobo Chai, Yongsheng Jia, Yuxiang Du, Bo Hu, Xianpeng Li
Summary: In this study, prefabricated artificial filled jointed rock specimens were repeatedly impacted by a self-made drop hammer impact device to obtain specimens with different levels of cumulative damage characteristics. The static and dynamic compression mechanical properties were then studied using a universal testing machine and SHPB device. Experimental results showed that the damage degree of jointed rock samples increased nonlinearly after multiple impacts, and the attenuation laws of static and dynamic strength were different. The failure mode of jointed rock samples tended to compression failure as the impact times increased.
SCIENTIFIC REPORTS
(2022)
Article
Multidisciplinary Sciences
Xingchao Tian, Tiejun Tao, Xia Liu, Jian Jia, Caijin Xie, Qianxing Lou, Qingzhi Chen, Zhenhua Zhao
Summary: This paper investigates the effects of in situ stress and joints on tunnel blasting hole network deployment and proposes an equation for blast stress wave attenuation and a method for calculating peripheral hole distance. Field core samples and indoor tests are conducted to obtain the parameters of jointed slate. The attenuation formula of blast stress wave under the combined action of in situ stress and joints is derived, and a formula for calculating peripheral hole distance is proposed considering the effects of in situ stress, joints, and rock body tensile strength. LS-PREPOST software is used to analyze the damage to the surrounding rock and the results are verified by on-site blasting test. The research provides important references for the control of over-excavation and under-excavation in large-section tunnel blasting.
SCIENTIFIC REPORTS
(2022)
Article
Energy & Fuels
Lianzeng Chai, Shaobo Chai, Pei Li, Jinhao Liu, Boyang Song, Xianpeng Li
Summary: This study analyzes stress wave propagation in filled jointed rock mass with viscoelastic properties based on the time-domain recursive analysis method. The results show that the amplitude attenuation and time delay of stress wave in rock mass with small cracks are influenced by the rock's viscoelastic behavior. The transmission and reflection characteristics of P-wave in filled jointed rock mass decrease significantly due to the attenuation effect of rock viscoelasticity, but stabilize as the quality factor increases.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2023)
Article
Engineering, Geological
Dongya Han, Hui Yang
Summary: The study experimentally investigated the effects of tensile stresses on wave behaviors across single natural rock joints, showing that increasing tensile stress decreases transmission coefficient and spectral amplitudes for ultrasonic waves. The wave velocity is also reduced under tension, and ultrasonic wave properties of single rock joints under tension can be well described by the displacement discontinuity model (DDM). Additionally, the specific stiffness of joints decreases with increasing tensile stress.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2021)
Article
Engineering, Geological
Jin Huang, Xiaoli Liu, Danqing Song, Jian Zhao, Enzhi Wang, Jianmin Zhang
Summary: An auxiliary device for simulating the liquid-filled layer was developed to analyze the dynamic response characteristics of liquid-filled rock joints in the laboratory. The experimental results showed that the energy propagation coefficient and peak liquid pressure decreased with increasing joint inclination within the considered range, and smaller coefficient values were obtained for granite specimens compared with PMMA specimens. The peak pressure for granite specimens was slightly higher than that for PMMA specimens.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2022)
Article
Nanoscience & Nanotechnology
Dong Yue, Lixin Guo, Jiangting Li, Linjing Guo
Summary: This paper presents a point-focusing lens antenna based on 3D printing technology for the experimental study of the interaction between electromagnetic waves and a small-area plasma. The lens combined with the horn antenna was designed using CST simulation software and printed using 3D printing technology for experimental verification. The results showed that the 3D-printed lens antenna exhibited a good focusing effect on electromagnetic waves.
Article
Materials Science, Multidisciplinary
Shuai Tang, Jin-Lei Wu, Cheng Lu, Xiaosai Wang, Jie Song, Yongyuan Jiang
Summary: We have achieved an analog of the reversed f-STIRAP phenomenon in an acoustic system by designing acoustic metamaterials. The agreement between analytical and simulated results confirms the similarity between the propagation of acoustic waves and the evolution of reversed f-STIRAP in quantum optics. The constructed acoustic metamaterials have optional functions such as beam focusing, beam splitting, or asymmetric transmission with switchable features, depending on the wavelength of the incident acoustic wave.
Article
Multidisciplinary Sciences
Feng Li, Chenchen Wang, Runchuan Sun, Guangyou Xiang, Baorui Ren, Zhao Zhang
Summary: Dynamic load disturbance in underground engineering can induce accidents and change stress state of layered rock mass, which can be effectively solved by Hamiltonian mechanics system. Specific effective vibration modes are found for thin plate rock mass, which is most likely to resonate and damage due to certain resonance frequency intervals and vibration amplitudes. The failure of fine sandstone is attributed to the resonance of effective vibration modes caused by hammer excitation, while the failure mechanism of thin plate involves tensile shear and shear failures on sides and corners, with crack propagation forming O-+ failure mode when tensile failure occurs in the center.
SCIENTIFIC REPORTS
(2022)
Article
Environmental Sciences
Dong Wang, Sheng Yan, Chen Chen, JianGuo Lin, Xupeng Wang, Ehsan Kazemi
Summary: This study simulated solitary wave propagation over a bottom-mounted barrier using the ISPH method and compared the results with experimental data to accurately capture turbulence characteristics. The effects of wave non-linearity and geometrical size of the barrier on flow separation were investigated, and the importance of energy dissipation due to the generation of vortices was evaluated. The developed ISPH method with the k-epsilon turbulence closure model can accurately reproduce velocity fields and turbulence characteristics for predictions of flow-structure interactions in urban hydro-environment systems.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2021)
Article
Engineering, Marine
Nguyet-Minh Nguyen, Duong Do Van, Tu Le Duy, Nhat Truong Pham, Thanh Duc Dang, Ahad Hasan Tanim, David Wright, Phong Nguyen Thanh, Duong Tran Anh
Summary: This study investigated the design parameters of Pile-Rock Breakwaters (PRBWs) in the Vietnamese Mekong Delta and their relationship with wave transmission coefficient, wave reflection coefficient, and wave energy dissipation. The results showed the significant influence of PRBW width on wave energy coefficients, with crest width being inversely proportional to wave transmission coefficient and directly proportional to wave reduction efficiency and energy dissipation.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Computer Science, Interdisciplinary Applications
Haoyu Han, Daisuke Fukuda, Jianbin Xie, Ebrahim Fathi Salmi, Ewan Sellers, Hongyuan Liu, Huaming An, Andrew Chan
Summary: In this study, a self-developed combined finite-discrete element method software is used to model the rock fracture process induced by a single-hole destress blasting and a two-round tunnel face excavation in a deep gold mine with high in-situ stresses. The effects of accelerometer holes and bedding planes are discussed and it is found that the destress blasting can shift the high abutment pressure away from the tunnel face and protect the tunnel wall from fracturing. The success of destress blasting in controlling excavation-induced rockbursts depends on site conditions and the design of the destress blasting.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Engineering, Geological
Chai Shao-bo, Zhou Tao, Tian Wei, Jing Yan-lin, Shi Jie-hui
Summary: This study quantitatively analyzes the interaction between stress waves and nonlinear rock structural planes, and deduces the wave propagation equation. The study finds that rock mass stresses have a significant influence on wave propagation characteristics.
ROCK AND SOIL MECHANICS
(2022)
Article
Physics, Applied
Janghoon Kang, Michael R. Haberman
Summary: This article investigates the spatiotemporal modulation of the surface acoustic admittance of a metasurface diffuser to improve sound diffusion. By using mathematical and finite element models, it demonstrates that the effects of spatial periodicity can be mitigated without introducing aperiodic spacing, thus reducing diffuser thickness and improving the diffusivity of the backscattered field.
APPLIED PHYSICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
S. Ghimire, F. Sabri
Summary: The complex microstructure of aerogels contributes to their superior insulating capabilities and unique acoustic fingerprint. A computational approach using the k-wave wave solving tool was developed to predict sound propagation behavior in monolithic aerogels. The model explored attenuation and loss values based on density, angle of incidence, and medium for frequencies ranging from 0.5 to 1 MHz. The results showed that loss increases with frequency and the medium significantly influences attenuation and other characteristics.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Geosciences, Multidisciplinary
Qun Yu, Fang Yu, Dali Yao, Shengji Jin
Summary: This study investigates the failure process and acoustic emissions of jointed rock mass containing a pre-existing hole under stress waves using a three-dimensional numerical model based on microscopic damage mechanics. The results demonstrate the significant effects of transmission energy, joint width, joint angle, and wavelength of stress waves on the failure modes and degrees of the rock.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Construction & Building Technology
Hao Wang, Ruijun Liang, Jian Li, Jiawei Liu, Hourong Li, Xiaozhong Hu, Kehong Zhu
Summary: In this study, the anchorage performance of the grouted corrugated duct connection (GCDC) was investigated through a two-phase experimental program. The first phase focused on factors affecting the anchorage requirement of GCDC, while the second phase analyzed the bond-slip constitutive relationship and developed a comprehensive constitutive model. The findings provide important reference for engineering application and finite element analysis of GCDC.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Danqing Yu, Caroline Bennett, Jian Li, William Collins
Summary: This paper studies the fatigue performance of a specific type of coupling assembly in aluminum overhead truss sign structures constructed before 2015 in Kansas. Through finite-element analysis and experimental tests, the research findings indicate that fatigue failure in these connections is unlikely to occur, and no evidence of preexisting cracks was found.
JOURNAL OF PERFORMANCE OF CONSTRUCTED FACILITIES
(2022)
Article
Construction & Building Technology
Xiao Wang, Jianchun Li, Xiaobao Zhao, Yue Liang
Summary: This paper discusses the propagation characteristics and attenuation prediction equation of blast-induced vibration on closely spaced rock tunnels based on field monitoring and numerical simulation. A new equation is proposed to predict the vibration velocity on adjacent tunnel section.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2022)
Article
Chemistry, Analytical
Sdiq Anwar Taher, Jian Li, Jong-Hyun Jeong, Simon Laflamme, Hongki Jo, Caroline Bennett, William N. Collins, Austin R. J. Downey
Summary: This paper presents the field implementation of structural health monitoring (SHM) for fatigue cracks in steel bridge structures. It proposes a wireless large-area strain sensor (WLASS) and an associated algorithm to measure and process large-area strain data for fatigue crack monitoring. The effectiveness of the proposed algorithm and WLASS are validated through numerical investigation and field deployment.
Article
Engineering, Multidisciplinary
Jong-Hyun Jeong, Hongki Jo, Simon Laflamme, Jian Li, Austin Downey, Caroline Bennett, William Collins, Sdiq Anwar Taher, Han Liu, Hyung-Jo Jung
Summary: Thin film-based flexible strain sensors have advantages for structural health monitoring (SHM). Previous research has developed a flexible strain sensor based on a soft elastomeric capacitor (SEC) and investigated an AC bridge-based method to convert dynamic capacitance changes into voltage signals. However, limitations in AC-bridge balancing, signal amplification control, and calibration have hindered its practical use. This study addressed these limitations with critical updates in hardware and software, resulting in a fully automated high-sensitive capacitive strain sensing system.
Article
Engineering, Civil
Rushil Mojidra, Jian Li, Ali Mohammadkhorasani, Fernando Moreu, Caroline Bennett, William Collins
Summary: A computer vision-based fatigue crack detection approach using a short video recorded under live loads by a moving consumer-grade camera is presented. Global motion compensation techniques are introduced to compensate for camera-induced movement, which can create false detection results. The proposed methodology is validated using two laboratory test setups and shows the importance of motion compensation for both 2D and 3D videos.
EARTHQUAKE ENGINEERING AND ENGINEERING VIBRATION
(2023)
Article
Engineering, Civil
Wenzhi Zheng, Ping Tan, Jian Li, Hao Wang, Yanhui Liu, Kui Yang
Summary: This study proposes a novel superelastic pendulum isolator with variable stiffness (SPIVS) equipped with copper-based shape memory alloy (CuSMA) to enhance the seismic resilience of bridges against near-fault earthquakes. The sensitivity of the novel SPIVS to outside temperature effects is considered. The seismic performance of the proposed SPIVSs for bridges is assessed by conducting case studies, and the feasibility and effectiveness of the system are discussed and demonstrated.
ENGINEERING STRUCTURES
(2023)
Article
Engineering, Mechanical
Hui Gao, Hao Wang, Jian Li, Jianxiao Mao, Zhihao Wang
Summary: A novel negative stiffness inerter damper (NSID) is proposed in this study to improve the control performance of stay cables. The NSID utilizes the damping enhancement of negative stiffness and inerter for cable vibration control. The study explores the modal behavior of the cable based on optimum parameters of the NSID and demonstrates the principle and conditions of the NSID for cable vibration control. The NSID performs better than other dampers in mitigating cable vibrations.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Construction & Building Technology
Hui Gao, Chenxi Xing, Hao Wang, Jian Li, Yang Zhang
Summary: Base isolation is an effective earthquake protection strategy for building structures. To improve its control performance, a new device called tuned negative stiffness inerter damper (TNSID) is proposed. By combining the benefits of an inerter and a negative stiffness element, the TNSID shows advantages in displacement mitigation, damping enhancement, and energy reduction. A demand-oriented optimum design method is also developed to balance the control performance and design cost.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Engineering, Civil
Wenzhi Zheng, Ping Tan, Jian Li, Hao Wang, Yanhui Liu, Zhibin Xian
Summary: This study develops a novel superelastic pendulum isolator with multi-stage variable curvature (SPIVC) to enhance the seismic resilience of the cold-regional bridges. The SPIVC system combines improved conical friction pendulum bearings (CFPB) and recentering devices made of copper-based shape memory alloy (CuSMA). With the optimum parameters determined based on the hysteretic characteristics of the re-centering device, the SPIVC system can provide both deformation accommodation and seismic isolation performance for bridges in cold regions.
ENGINEERING STRUCTURES
(2023)
Article
Engineering, Mechanical
Yun Liu, Hao Wang, Zidong Xu, Jian Li, Tong Wu, Jianxiao Mao
Summary: In this paper, a correlated-turbulence wave number-frequency spectral representation method (CT-WSRM) is proposed for simulating turbulent wind fields. Turbulent spectra that consider the correlation of turbulence are established using wind data measured during Typhoon Yanhua at the Ma'anshan Yangtze River (MYR) Bridge site in China. The proposed method can be utilized to simulate multidimensional multivariate two dimensional-three variate (2D-3V) spatial-temporal turbulent wind fields. This method can be further utilized in the dynamic reliability analysis, providing structural reliability evaluation from the probabilistic view.
JOURNAL OF ENGINEERING MECHANICS
(2023)
Article
Engineering, Multidisciplinary
Emmanuel Ogunniyi, Alexander Vareen, Austin R. J. Downey, Simon Laflamme, Jian Li, Caroline Bennett, William Collins, Hongki Jo, Alexander Henderson, Paul Ziehl
Summary: Damage to bridges can lead to fatal structural failures. Monitoring and detecting cracks in concrete infrastructure is important for reducing these risks, but it can be expensive due to the number of sensors required. This study explores the use of rubber isolators to reduce the capacitive coupling between concrete and sensors, and demonstrates accurate strain monitoring with the SEC sensor on concrete beams and bridge decks.
MEASUREMENT SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Multidisciplinary
Simon Laflamme, Filippo Ubertini, Alberto Di Matteo, Antonina Pirrotta, Marcus Perry, Yuguang Fu, Jian Li, Hao Wang, Tu Hoang, Branko Glisic, Leonard J. Bond, Mauricio Pereira, Yening Shu, Kenneth J. Loh, Yang Wang, Siqi Ding, Xinyue Wang, Xun Yu, Baoguo Han, Yiska Goldfeld, Donghyeon Ryu, Rebecca Napolitano, Fernando Moreu, Giorgia Giardina, Pietro Milillo
Summary: Structural health monitoring (SHM) is the automation of assessing the condition of engineered systems. The challenge lies in designing cost-effective sensing solutions for large components or structures, and the implementation of these solutions is still limited due to economic and technical challenges.
MEASUREMENT SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Mechanical
Sdiq Anwar Taher, Jian Li, Huazhen Fang
Summary: This paper investigates the simultaneous real-time input and state estimation and optimal sensor placements in systems without direct feedthrough. The paper proposes an optimal sensor placement algorithm (OSPA) to ensure the required system conditions are met, which is integrated with two optimal real-time filters – minimum-variance unbiased input and state estimation filter (MVUIS) and Augmented State Kalman Filter (ASKF). The developed OSPA along with the MVUIS and ASKF provide accurate and stable estimations in real-time, improving performance and reducing errors. Numerical, experimental, and real-world studies validate the effectiveness of the proposed approach.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Construction & Building Technology
Wenzhi Zheng, Ping Tan, Jian Li, Hao Wang, Yanhui Liu, Zhibin Xian
Summary: A novel superelastic conical friction pendulum isolator (SCFPI) is developed by combining an improved conical friction pendulum isolator (CFPI) with shape memory alloy (SMA) to improve the seismic performance of bridges. The SCFPI system is designed with a flat sliding function to enhance adaptability under service loadings. The study proposes a cost-effective design method and conducts case studies to demonstrate the effectiveness of the SCFPI system and design method under near-fault ground motions.
STRUCTURAL CONTROL & HEALTH MONITORING
(2023)
