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arXiv 2024年

作者： You, Lingyun Guo, Nanning Long, Zhengwu Wang, Fusong Si, Chundi Diab, Aboelkasim School of Civil and Hydraulic Engineering Huazhong University of Science and Technology Hubei Province Wuhan430074 China State Key Laboratory of Mechanical Behaviour and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Hebei Province Shijiazhuang050043 China Department of Civil Engineering College of Engineering Fahad Bin Sultan University Tabuk71454 Saudi Arabia Department of Civil Engineering Aswan University Aswan81542 Egypt

Asphalt pavements as the most prevalent transportation infrastructure, are prone to serious traffic safety problems due to functional or structural damage caused by stresses or strains imposed through repeated traffic loads and continuous climatic cycles. The good quality or high serviceability of infrastructure network is vital to the urbanization and industrial development of nations. In order to maintain good functional pavement performance and extend the service life of asphalt pavements, the long-term performance of pavements under maintenance policies needs to be evaluated and favourable options selected based on the condition of the pavement. A major challenge in evaluating maintenance policies is to produce valid treatments for the outcome assessment under the control of uncertainty of vehicle loads and the disturbance of freeze-thaw cycles in the climatic environment. In this study, a novel causal inference approach combining a classical causal structural model and a potential outcome model framework is proposed to appraise the long-term effects of four preventive maintenance treatments for longitudinal cracking over a 5-year period of the upkeep. Three fundamental issues were brought to our attention: 1) detection of causal relationships prior to variables under environmental loading (identification of causal structure);2) obtaining direct causal effects of treatment on outcomes excluding covariates (identification of causal effects);and 3) sensitivity analysis of causal relationships. The results show that the method can accurately evaluate the effect of preventive maintenance treatments and assess the maintenance time to cater well for the functional performance for different preventive maintenance approaches. This framework could help policymakers to develop appropriate maintenance strategies for pavements. Copyright © 2024, The Authors. All rights reserved.

关键词： Sensitivity analysis

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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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Author Correction: Origin and tuning of bandgap in chiral phononic crystals

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Communications Physics 2024年第1期7卷 1页

作者： Wei Ding Rui Zhang Tianning Chen Dewen Yu Jian Zhu Shuai Qu Liwei Dong Yaowen Yang Badreddine Assouar School of Mechanical Engineering and State Key Laboratory of Strength & Vibration of Mechanical Structures Xi’an Jiaotong University Xi’an 710049 Shaanxi China School of Civil and Environmental Engineering Nanyang Technological University 50 Nanyang Avenue 639798 Singapore Singapore Train and Track Research Institute State Key Laboratory of Rail Transit Vehicle System Southwest Jiaotong University Chengdu 610031 China Institute of Rail Transit Tongji University Shanghai 201804 China Université de Lorraine CNRS Institut Jean Lamour F-54000 Nancy France

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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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