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SSRN 2023年

作者： Xu, Ang Ma, Wenyong Yuan, Huanxin Lu, Lihe State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Shijiazhuang050043 China School of Civil Engineering Shijiazhuang Tiedao University Shijiazhuang051132 China Key Laboratory of Road and Railway Engineering Safety Ministry of Education Shijiazhuang Tiedao University Shijiazhuang Hebei050043 China Innovation Center for Wind Engineering and Wind Energy Technology of Hebei Province Hebei050043 China School of Civil Engineering Wuhan University Wuhan430072 China Inner Mongolia Electric Power Survey & Design Istitute Co. Ltd. Huhehot Inner Mongolia 010011 China

Row spacing and ground clearance have a significant effect on the wind load of a photovoltaic (PV) array. Based on wind tunnel tests and numerical simulations with the self-sustainable equilibrium atmospheric boundary layer, the influences of row spacing and ground clearance on the wind load of PV arrays are analysed, and the mechanism of the wind-induced interference effect is determined by flow field analysis. The results show that the ground clearance affects the wind load distribution on the PV module, and this effect has an inconsiderable impact on the net wind pressure on the PV modules. The effect of row spacing on the wind load of PV arrays is more significant, and this effect is mainly manifested in the shielding effect. The tilt angle is the main factor that affects the size of the vortex scale which significantly influences the wind load. The ground clearance, row spacing and tilt angle all affect the torque coefficient on the PV module. The larger the ground clearance is, the larger the torque coefficient. Finally, the wind load coefficients and reduction factors are presented as a recommendation for wind resistance design of PV arrays. © 2023, The Authors. All rights reserved.

关键词： Atmospheric boundary layer

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curing Stress Effect on Stability, Microstructure, Matric Suction and Electrical conductivity of cementitious Tailings Backfills

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SSRN 2022年

作者： chen, Shunman Yilmaz, Erol Wang, Wei Wang, Yi-Ming School of Civil Engineering and Architecture East China Jiaotong University Jiangxi Nanchang330013 China State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Hebei Province Shijiazhuang050043 China Jiangxi Key Laboratory of Disaster Prevention-mitigation and Emergency Management East China Jiaotong University Jiangxi Nanchang330013 China Department of Civil Engineering Geotechnical Division Recep Tayyip Erdogan University Fener RizeTR53100 Turkey School of Civil and Resources Engineering University of Science and Technology Beijing Beijing100083 China

cementitious tailings backfill (cTB) is a regularly used technique for most mines at home and aboard since it has a significant meaning for the recycling of total tailings and enhances the safety of underground mines. Thus, studying the behavior of the cTB materials exposed to diverse curing stresses is fairly vital to guarantee the whole stability and long-term ageing of underground mining structures. This paper inspects the effect of diverse curing stresses (0 kPa – witness, 180 kPa, 360 kPa and 540 kPa) on physico-mechanical characteristics of cTB materials subjected to a curing age of up to 28 days. Based on lab tests, uniaxial compression and microstructure analyses are performed for all the specimens. To well characterize the self-desiccation behavior of cTB specimens, suction and electrical conductivity are also scrutinized during their curing processes. Results indicate that curing of cTBs under stress ranging from 0 to 540 kPa can improve their strength gains to some extent. Irrespective of curing stress, cTB’s suction is enlarged while its porosity is dropped once increased with curing age and stress, respectively. There exists a robust power function between suction and strength while there is a linear link between electrical conductivity and strength. One can state from this study that curing stress must be significantly taken into account during the backfill mixture proportions’ design. © 2022, The Authors. All rights reserved.

关键词： Pore structure

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Data-Driven Turbulence Model for Unsteady cavitating Flow

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SSRN 2022年

作者： Zhang, Zhen Wang, Jingzhu Huang, Renfang Qiu, Ruidi Ye, Shuran Wang, Yiwei Liu, Qingkuan State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Shijiazhuang050043 China Innovation Center for Wind Engineering and Wind Energy Technology of Hebei Province Shijiazhuang050043 China School of Civil Engineering Shijiazhuang Tiedao University Shijiazhuang050043 China Key Laboratory for Mechanics in Fluid Solid Coupling Systems Institute of Mechanics Chinese Academy of Sciences Beijing100190 China School of Future Technology University of Chinese Academy of Sciences Beijing100049 China School of Engineering Science University of Chinese Academy of Sciences Beijing100049 China

Reynolds-averaged Navier-Stokes (RANS) equations have been widely used in engineering fields to investigate cavitating flow owing to their low computational cost and excellent robustness. However, it is challenging to accurately obtain the unsteady characteristics of cavitating flow owing to cavitation-induced phase transitions. In this study, we propose an implicit data-driven RANS (DD-RANS) framework based on a higher-order eddy viscosity model to analyze the unsteady characteristics of cavitating flow. In the DD-RANS framework, a basic computational model is developed by introducing a cavitation-induced phase transition into the equations of Reynolds stress in the process of turbulence modeling. To improve the computational accuracy and generalization performance of the basic model, the linear and nonlinear parts of the anisotropic Reynolds stress tensor are predicted through implicit and explicit methods, respectively. A data fusion approach, allowing the input and output of characterized parameters at multiple time points, is presented to obtain the unsteady characteristics of the model dataset. The neural networks in the DD-RANS model are trained using the numerical results obtained via large eddy simulation (LES). The training data consists of two parts: (i) the results obtained at cavitation numbers of 2.0, 2.2, and 2.7 for a Venturi flow, and (ii) those obtained at cavitation numbers of 0.8 and 1.5 for a NAcA66 hydrofoil. The DD-RANS model is used to predict the cavitating flow at cavitation numbers of 2.5 for a Venturi flow and 0.8 for a clark-Y hydrofoil. It is found that the DD-RANS model is superior to the baseline RANS model in predicting the instantaneous periodic shedding of a cavity and the mean flow fields. Furthermore, the developed DD-RANS exhibited excellent generalization abilities. © 2022, The Authors. All rights reserved.

关键词： cavitation

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NUMERIcAL STUDY ON TRANISENT NATURAL cONVEcTION IN cOAL SHED ENcLOSED OF SINGLE cOAL PILE

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Gongcheng Lixue/engineering Mechanics 2023年第10期40卷 237-246页

作者： Wang, Wen-Yue cui, Hui-Min Han, Zhi-Ming Liu, Qing-Kuan Department of Mathematics and Physics Shijiazhuang Tiedao University Hebei Shijiazhuang050043 China State Key Laboratory of Mechanical Behavior System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Hebei Shijiazhuang050043 China Innovation Center for Wind Engineering Wind Energy Technology of Hebei Province Hebei Shijiazhuang050043 China School of Civil Engineering Shijiazhuang Tiedao University Hebei Shijiazhuang050043 China

In recent years, the environmentally friendly closed coal shed has been widely used in actual production and life. The heat released from the coal pile will cause local overheating of the environment, which will affect the comfort and health of workers. So the problem of convective heat transfer in coal shed has attracted extensive attention. In order to reduce the harm of coal heap heat release, it is necessary to understand the mechanism of heat transfer and flow in the process of coal heap heat release. cFD numerical simulation method is used to study the natural convection phenomenon in the closed large span coal shed with a single coal pile. Under unsteady conditions, the heat transfer characteristics and flow transition around coal pile with fixed Rayleigh number are studied. The emergence time of symmetric and asymmetric flow structures in coal shed under different Rayleigh numbers are studied. The unsteady characteristics of flow in full development stage are given. The results show that the transient flow in the coal shed will go through three different stages: initial stage, transitional stage and quasi-steady stage. During the transitional stage, the separation and shedding of the plume will promote the formation of asymmetric structure in coal shed, and the emergence time of asymmetric phenomenon will advance with the increase of Rayleigh number. In the quasi-steady stage, the flow in the coal shed presents the characteristics of irregular unsteady turbulent flow, and the time to reach full-development state is delayed with the increase of Rayleigh number. © 2023 Tsinghua University. All rights reserved.

关键词： coal

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corrigendum to “Study on the interface damage of cRTS Ⅱ slab track under temperature load” [structures 26 (2020) 224–236]

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structures 2020年 28卷 2174-2174页

作者： Yang Li Jinjie chen Jianxi Wang Xianfeng Shi Long chen State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Shijiazhuang 050043 China Key Laboratory of Roads and Railway Engineering Safety Control (Shijiazhuang Tiedao University) Ministry of Education Shijiazhuang 050043 China Innovation Center of Railway Fastener System Technology of Hebei Province Shijiazhuang 050043 China School of Civil Engineering Hebei University of Water Resources and Electric Engineering Cangzhou 061001 China

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Parametric Influences of Stability and Settlement Pattern of Embankment on Slope Foundation

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IOP conference Series: Earth and Environmental Science 2020年第1期560卷

作者： Ouyang Zhang Guangqing Yang Yunfei Zhao Huali Lu Licheng Hou The Third Construction Engineering Company Ltd. China Construction Second Engineering Bureau Ltd. Beijing 100070 China School of Civil Engineering Shijiazhuang Tiedao University Shijiazhuang 050043 China State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures (Shijiazhuang Tiedao University) Shijiazhuang 050043 China School of Traffic and Transportation Shijiazhuang Tiedao University Shijiazhuang 050043 China China State Construction Engineering Corp. Ltd Beijing 100020 China

Building a subgrade on the slope foundation is common for highway constructions in china. Under different hydrogeological conditions, the stability and differential settlement are the main problems for the construction of the subgrade. In order to study the parameters that influence the stability and deformation of subgrade, based on the cross-section of a mountainous region highway, those simulations were conducted to study the influence of subgrade height, subgrade width, embankment slope angle, and slope foundation angle on the stability and pattern of embankment. The results showed that the allowable filling height is 15 m; otherwise, there is a large risk of the slope sliding. Further, it was found that the maximum vertical deformation on the right shoulder of the embankment increases with an increase in the angles of the slope of the foundation. These results provide references for future highway constructions and design works in mountainous areas.

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Effect of Tamping Energy on the Reinforcement of a High Embankment Filled with Soil-Rock

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IOP conference Series: Earth and Environmental Science 2020年第1期560卷

作者： Licheng Hou Guangqing Yang Jing Jin Huali Lu Ouyang Zhang The Third Construction Engineering Company Ltd. China Construction Second Engineering Bureau Ltd. Beijing 100070 China School of Civil Engineering Shijiazhuang Tiedao University Shijiazhuang Hebei 050043 China State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Shijiazhuang Hebei 050043 China School of Civil Engineering Hebei University of Science and Technology Shijiazhuang Hebei 050018 China China State Construction Engineering Corp. Ltd Beijing 100020 China

Through dynamic compaction tests with tamping energies of 1500, 2000, and 2500 kN•m of an embankment section in the PingShan–ZanHuang Expressway, the compression deformation behavior of the tamping settlement, soil deformation around the tamping rammer, consolidation depth, and dynamic stress of dynamic compaction were comprehensively tested. comparative analyses of field data under three different tamping energies suggested that the optimal tamping energy, number of strikes, and vertical effective tamping depth for this embankment are 2000 kN•m, six, and 5 m, respectively. The field test data proving that dynamic compaction has a significant effect on this embankment.

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