Article
Engineering, Geological
Siwei Wang, Jianchun Li, Xing Li, Lei He
Summary: This study conducted dynamic photoelastic tests to investigate the influence of joints on stress fields and wave propagation, revealing that joint contact area ratio, joint thickness, and joint surface distribution significantly affect wave propagation and stress fields near joints. The study provides insights into stress field disturbances and the effects of joint geometrical properties on wave propagation through photoelastic testing.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2022)
Article
Mining & Mineral Processing
Zhenyu Han, Diyuan Li, Xibing Li
Summary: Filled inclusions in rock discontinuities have a significant impact on the mechanical characteristics and stability of rock engineering. Experimental results show that the interlayer strength influences wave propagation and fracture processes. Increasing interlayer stiffness leads to higher transmission coefficient, strength, closure, and stiffness. The cement mortar layer acts as a buffer, while a weaker interlayer causes slabbing near the rock-mortar interface.
INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Geological
Kallol Saha, Resmi Sebastian
Summary: Shear wave propagation across frictional joints was investigated using the Split Shear Plate (SSP) test facility. Laboratory experiments were conducted to determine the energy coefficients and transmission amplitude coefficients for joints with different orientations. The study presents the energy transmission, displacement amplitudes, and frequency of the waves propagated across the joints.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Engineering, Environmental
Shizheng Fang, Yang Yang, Yong Zhao, Jun Chen, Weiyu Li
Summary: In this study, the influence of a sub-zero temperature environment on the dynamic characteristics of weakly cemented red sandstone rock was investigated. Dynamic tests were conducted using a modified split Hopkinson pressure bar (SHPB) experiment system. The results showed that the weakly cemented sandstone exhibited plastic characteristics under lower sub-zero temperatures. The dynamic compressive strength (DCS) and elastic modulus of the rock increased exponentially with the strain rate and were found to increase with decreasing temperature. However, with a further decrease in temperature, both parameters showed a rapid increase followed by a rapid decrease. Additionally, the energy dissipation of the weakly cemented red sandstone was significantly affected by the sub-zero temperature. The research findings provide valuable insights for engineering construction in cold regions.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(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
Engineering, Mechanical
Shiguan Chen, Huimei Zhang, Lei Wang, Chao Yuan, Xiangzhen Meng, Gengshe Yang, Yanjun Shen, Yani Lu
Summary: In this study, the dynamic disturbance damage mechanism of rocks under dynamic loads was investigated through laboratory tests and analysis. The results showed that an increase in disturbance times led to an increase in macro damage. Low-velocity impact had a greater impact on internal damage, while high-velocity impact had a greater effect on the reflection and transmission of energy. Additionally, the final fracture fractal characteristics of rocks were correlated with energy dissipation under dynamic stress disturbance.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Geosciences, Multidisciplinary
Vashan Wright, Jhardel Dasent, Richard Kilburn, Michael Manga
Summary: Ice and other mineral cements in Mars' shallow subsurface affect the mechanical properties of the shallow crust, the geologic processes that shape the planet's surface, and the search for past or extant Martian life. Cements increase seismic velocities. Rock physics models are used to infer cement properties from seismic velocities. Model results confirm that the upper 300 m of Mars beneath InSight is most likely composed of sediments and fractured basalts, with grains unlikely to be cemented by ice or other mineral cements. Fractures within the basalt layers could be filled with gas and a small percentage of mineral cement, but not ice or liquid water-saturated layers. Cement at grain contacts has likely been broken by impacts or marsquakes.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Engineering, Civil
Tong-de Zhao, Qing Li, Bing-bing Yu, Chen Huang, Zheng-hua Gao, Kai Wang
Summary: This paper conducted dynamic compression tests on mortar-sandstone composite specimens of different grades using the Hopkinson pressure bar system and a high-speed photography system. The effects of impact velocities and mortar strength on the mechanical properties, energy dissipation, and failure modes of the composite specimens were investigated. The results showed that the properties of the composite specimens were significantly influenced by strain rate, and increasing the mortar strength grade improved the bearing capacity and reduced damage. The degree of fragmentation increased with increasing impact velocity, and the mortar specimens were damaged more severely than the sandstone specimens.
Article
Chemistry, Physical
Linqi Huang, Xin Wu, Sijian Zeng, Xibing Li
Summary: This study investigated the mechanical properties of wave-absorbing metal plates through true-triaxial static-dynamic-coupling loading tests. The results showed that the aperture size and plate thickness have an influence on the peak stress, reflectivity, and energy-absorption rate of the wave-absorbing metal plate, with the plate thickness having a greater impact than the aperture size.
Article
Geochemistry & Geophysics
Qirui Wang, Qihu Zhang, Liyun Yang, Fuli Kong, Chenxi Ding, Junqi Fan
Summary: Experimental research was conducted on intact rock mass and jointed rock mass using numerical software LS-DYNA and indoor SHPB impact system to study the effects of confining pressure and joint material properties on stress evolution and fracture behavior. The study obtained the peak stress, reflection and transmission coefficient, and specimen failure state under different schemes. The research explained the propagation and attenuation law of explosive stress waves, considering the effects of confining pressure level and joint material properties. The results showed that the impact resistance of limestone specimen can be increased within a specific range of confining pressure, but it decreases if the confining pressure continues to increase after reaching the peak value. The dynamic strength of jointed rock mass and the impact damage resistance followed the same pattern, depending on the type of joint material.
Article
Engineering, Civil
Jiong Wang, Lei Ma, Fei Zhao, Bangguo Lv, Weili Gong, Manchao He, Peng Liu
Summary: This study investigates the full-field strain of rock material under dynamic compression load using the high-speed three dimensional digital image correlation (3D-DIC) method. The experimental results reveal the effects of wave propagation, dispersion, and radial inertial on the specimen, as well as the strain recovery phenomenon in the post-peak stage. Compared with the traditional one-dimensional theory method, the 3D-DIC method provides more accurate measurement of the variation details of rock strain.
Article
Engineering, Geological
Yubai Li, Yue Zhai, Yifan Xie, Deyun Liu, Fandong Meng
Summary: As the mileage of long tunnels and the number of underground engineering projects increase, the stability of rock mass after fire and explosion becomes a prominent issue. Therefore, studying the high strain rates mechanical properties of rocks under different heat treatment methods is important for geological engineering design. In this study, Caledonian granite of Sejila Mountain is selected, and impact compression tests are conducted after high-temperature natural cooling and real-time high-temperature treatment. The results show that the temperature threshold of Sejila Mountain granite is 800 celcius, and the peak stress decreases by different percentages under different temperature conditions.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Engineering, Geological
Meng Sun, Junnan Cao, Jingjing Cao, Shuai Zhang, Yunmin Chen, Bate Bate
Summary: Bio-remediation is widely used to improve soil by introducing CaCO3, and shear wave velocity (Vs) is usually adopted to evaluate the effect. This study used the discrete element method (DEM) to simulate Vs evolution and wave propagation path of sand reinforced by calcite precipitates, revealing the microscopic mechanisms and enhancement effect of microorganism-reinforced soil with increasing CaCO3 content.
Article
Engineering, Electrical & Electronic
Yanping Liu, Xuming Fang, Ming Xiao
Summary: This paper studies the problem of maximizing weighted sum energy efficiency in an uplink mmWave network by jointly selecting TRPs and allocating resources, considering both scenarios with and without inter-beam interference. Solutions are proposed for both scenarios, and simulation results confirm the effectiveness of the proposed schemes.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2021)
Article
Construction & Building Technology
Yongqiang Hou, Shenghua Yin, Xin Chen, Minzhe Zhang, Shixing Yang
Summary: The study found that the characteristic stress and energy consumption of the cemented tailings backfill (CTB) increase exponentially with curing age, especially for CTB with a higher cement-to-tailings ratio at 3d to 14d curing ages. Additionally, the deformation and failure of CTB go through five stages, and the loading damage can also be divided into five stages based on damage values and energy growth laws. The slow growth and abrupt change of the elastic energy consumption ratio in the post-peak stage can serve as a criterion for strength instability of the CTB.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Biophysics
Bingzhu Wang, Tiantang Yu, Tao Zhou, Lu Wang, Jian Li, Nenggang Xie
Summary: In this study, a novel multi-posture lower limb rehabilitation robot with three postures is developed to provide different amplitudes and frequencies of rehabilitation training for hip, knee and ankle joints. Kinematic and dynamic analyses are carried out, resulting in ideal trajectory curves for rehabilitation motion. An improved ion motion optimization algorithm is proposed and applied for optimization and adjustment in controller design. Experimental results show accurate and effective trajectory planning and control design, ensuring the stability and rationality of the rehabilitation training process.
JOURNAL OF MECHANICS IN MEDICINE AND BIOLOGY
(2023)
Article
Mechanics
Chenxi Zhang, Diyuan Li, Jinyin Ma, Quanqi Zhu, Pingkuang Luo, Yuda Chen, Minggang Han
Summary: The influence of loading rate on the mode I fracture property of rocks has been extensively studied, but the rate-effect of dynamic mode II fracture is rarely reported. This study conducted a series of dynamic mode II fracture tests under a wide range of loading rates using the modified split Hopkinson pressure bar (SHPB) system. The results showed that the dynamic mode II fracture toughness increases with loading rate, and the fracture processes can be divided into multiple stages.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Engineering, Geological
Tao Zhou, Dongya Han, Jianbo Zhu
Summary: In this study, the influence of damage evolution on ultrasonic wave propagation in unconfined uniaxially loaded granite specimens was experimentally investigated. The results showed that the stress-driven damage in granite specimen is highly nonlinear, and it increases drastically to the peak when the axial stress approaches the peak point. Wave propagation in granite is stress-dependent during compression, with both wave amplitude and velocity increasing first and then decreasing. Compared with wave velocity, wave amplitude is more sensitive to stress and damage. The findings of this study contribute to a better understanding of the relationship between damage evolution and wave propagation and attenuation in rocks.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Engineering, Electrical & Electronic
Yi Zeng, Ming Yu, Tao Zhou
Summary: This article presents an advanced synthesis and novel designs of inline fully canonical filters with cascaded extracted pole (EP) sections for higher band-edge selectivity and interference suppression. The conventional fully canonical prototype is reconfigured and a general node scaling method is implemented for simplified filter design. The importance of precise control over the junction susceptances is discussed for the first time, and a new compact EP structure in coaxial technique is proposed. The effectiveness of the proposed theories is validated with good measurement results.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2023)
Article
Engineering, Electrical & Electronic
Kai Wang, Liu Liu, Jiachi Zhang, MeiLu Liu, Tao Zhou, Bo Ai
Summary: A reliable train-to-ground wireless communication system is proposed for the safe operation of Hyperloop. The wireless channel characteristics of Hyperloops at millimeter-wave (mmWave) bands are analyzed using the ray-tracing method. The investigation and analysis of large-scale and small-scale channel characteristics at different mmWave frequency carriers show that the path loss increases with frequency while the time delay spread and angular spread remain almost unchanged. These research results will contribute to the design of future Hyperloop wireless communication systems.
IET MICROWAVES ANTENNAS & PROPAGATION
(2023)
Article
Computer Science, Cybernetics
Tao Zhou, Qinze Mi
Summary: The determinants of user switching between social Q&A platforms are examined in this work, and the results suggest that improving content quality and user experience, and reducing dissatisfaction and fatigue can prevent users' switching and retain them.
UNIVERSAL ACCESS IN THE INFORMATION SOCIETY
(2023)
Editorial Material
Mathematics, Applied
Alexander Kurganov, Tao Zhou
EAST ASIAN JOURNAL ON APPLIED MATHEMATICS
(2023)
Editorial Material
Engineering, Chemical
Yong Zhu, Tao Zhou, Qiang Gao, Xiaoming Yuan, Chuan Wang, Bo Hu
Article
Energy & Fuels
Peiwang Cao, Tao Zhou, Yang Ju, Jianbo Zhu
Summary: It is still unclear how different loading angles (beta) affect the mixed mode I/II fracture behavior of rock. To investigate this, cracked straight through Brazilian disc tests were performed on sandstone under various beta. The results show that the effect of beta on peak load and crack propagation velocity is slight, but there is a linear increase in mixed mode I/II fracture toughness with increasing beta.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2023)
Article
Energy & Fuels
Tao Zhou, Xiaozhong Zhu, Haifei Yang, Xuyang Yan, Xuejun Jin, Qingzhu Wan
Summary: This paper proposes a method for identifying insulation defects in XLPE cables based on deep learning algorithms, providing a rapid and effective solution for detecting cable insulation defects in the power-related sectors.
GLOBAL ENERGY INTERCONNECTION-CHINA
(2023)
Article
Engineering, Environmental
Kun Du, Xinyao Luo, Tao Zhou
Summary: This study conducts acoustic integrated uniaxial compression tests on 11 types of rock specimens to investigate their acoustic behavior and brittleness properties. Thin section analysis and weighted variable coefficient are used to characterize the mineral composition and grain uniformity of the rocks. The relationships between grain characteristics, mineral composition, and acoustic behaviors are investigated, and a novel brittleness index for rocks is established based on ultrasonic characteristic parameters and mineral composition.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2023)
Article
Mechanics
Jiarong Chen, Xuehan Yin, Changtai Zhou, Muyuan Pan, Zhenyu Han, Tao Zhou
Summary: This study investigated the effect of flaw geometries on the interaction between flaws under compressive-shear loading. The results showed that the axial peak force of flawed specimens was sensitive to the flaw configuration, and the axial peak forces of specimens with parallel flaws were greater than those with coplanar ones. Additionally, it was found that tensile strain primarily influenced crack initiation and propagation, while edge cracks exhibited a combination of tensile and shear strains. Furthermore, novel parameters were proposed to quantitatively characterize the independent effect between coplanar flaws and the reinforced effect between parallel flaws. The findings of this study contribute to a better understanding of the interaction between flaws and rock failure characteristics under compressive-shear loading conditions.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Engineering, Electrical & Electronic
Zhen-Yuan Zhang, Chao Feng Ding, Yi Zeng, Huafeng Su, Tao Zhou, Xiu Yin Zhang, Ming Yu
Summary: This article proposes a general circuit model and a generalized approach to design an N th-order parallel coupled wire antenna with its companion circuit model. The design procedure starts with an initial prototype developed from a synthesized arrow coupling matrix, and then, its companion circuit is constructed accordingly. The proposed method offers a deterministic way for optimally designing an arbitrary-order filtering wire antenna with proper frequency characteristics.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2023)
Article
Construction & Building Technology
Chunning Pei, Peiyuan Chen, Weibo Tan, Tao Zhou, Jin Li
Summary: This paper investigates and compares three methods of using wet copper tailings as a replacement for fly ash in the preparation of high-performance concrete. Experimental results show that high-performance concrete with pre-wetted copper tailings has similar fresh properties to conventional concrete, as well as lower autogenous shrinkage and denser pore structure. The compressive strength of the high-performance concrete is significantly higher compared to conventional concrete.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Engineering, Marine
Yong Zhu, Tao Zhou, Shengnan Tang, Shouqi Yuan
Summary: This research uses deep learning method to extract feature from vibration signals and establishes an adaptive convolutional neural network model for typical failure recognition of an axial piston pump. The proposed method achieves a higher accuracy in fault classification and diagnosis.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
