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Transportation engineering 2025年 20卷

作者： Liu, Jiankun Sun, Zhaohui cui, Yinghui Hu, Tianfei Tai, Bowen School of Civil Engineering & State Key Laboratory for Tunnel Engineering Sun Yat-Sen University Guangzhou519082 China Institute of Future Civil Engineering Sciences and Technology Chongqing Jiaotong University Chongqing 400074 China China State Railway Group Co. Ltd Beijing 100844 China State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Shijiazhuang050043 China State Key Laboratory of Cryospheric Science and Frozen Soil Engineering Northwest Institute of Eco-Environment and Resources Chinese Academy of Sciences Lanzhou730000 China

Permafrost is widely distributed across the Qinghai-Tibet Plateau, and under the influence of climate warming, low-temperature frozen soil is gradually degrading into warm frozen soil. The ratio of ice to unfrozen water in warm frozen soil is highly sensitive to temperature changes, resulting in significant instability in its mechanical properties. To ensure the long-term stability of structures overlying permafrost foundations, conducting research on the mechanical characteristics of warm frozen soil and proposing effective measures to mitigate thaw settlement are crucial. This paper presents the research progress of our team in the field of warm frozen soil dynamics. Using a dynamic triaxial apparatus for frozen soil and a self-developed dynamic direct shear apparatus, we investigated the behavior of warm frozen soil under different temperatures, revealing the influence of temperature on its dynamic stress-strain relationship and dynamic parameters. The development of frozen soil creep theory is reviewed, and advancements in frozen soil dynamics research are summarized and discussed. This paper proposes the use of solar refrigeration technology to protect permafrost, introducing a solar-powered compression refrigeration device and its working principles. The active cooling performance of the device was tested through model experiments and field trials. Additionally, the design and construction techniques of all-season cooling embankments are discussed, providing theoretical and technical support for the stability control of subgrade engineering in permafrost regions. © 2025 The Author(s)

关键词： Permafrost

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Effect of Tamping Energy on the Reinforcement of a High Embankment Filled with Soil-Rock 4

Effect of Tamping Energy on the Reinforcement of a High Emba...

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2020 4th International conference on Water conservancy, Hydropower and Building engineering, WcHBE 2020

作者： Hou, Licheng Yang, Guangqing Jin, Jing Lu, Huali Zhang, Ouyang Third Construction Engineering Company Ltd. China Construction Second Engineering Bureau Ltd. Beijing100070 China School of Civil Engineering Shijiazhuang Tiedao University Shijiazhuang Hebei050043 China State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Shijiazhuang Hebei050043 China School of Civil Engineering Hebei University of Science and Technology Shijiazhuang Hebei050018 China China State Construction Engineering Corp. Ltd Beijing100020 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. © Published under licence by IOP Publishing Ltd.

关键词： Embankments

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Illumination robust loop closure detection with the constraint of pose

arXiv

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arXiv 2019年

作者： Deli, Yan Wenkun, Tuo Weiming, Wang Shaohua, Li State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Shijiazhuang050043 China School of Electrical and Electronic Engineering Shijiazhuang Tiedao University Shijiazhuang050043 China School of Electronic and Information Engineering Beijing Jiaotong University Beijing100044 China

Background: Loop closure detection is a crucial part in robot navigation and simultaneous location and mapping (SLAM). Appearance-based loop closure detection still faces many challenges, such as illumination changes, perceptual aliasing and increasing computational complexity. Method: In this paper, we proposed a visual loop-closure detection algorithm which combines illumination robust descriptor DIRD and odometry information. The estimated pose and variance are calculated by the visual inertial odometry (VIO), then the loop closure candidate areas are found based on the distance between images. We use a new distance combing the the Euclidean distance and the Mahalanobis distance and a dynamic threshold to select the loop closure candidate areas. Finally, in loop-closure candidate areas, we do image retrieval with DIRD which is an illumination robust descriptor. Results: The proposed algorithm is evaluated on KITTI_00 and EuRoc datasets. The results show that the loop closure areas could be correctly detected and the time consumption is effectively reduced. We compare it with SeqSLAM algorithm, the proposed algorithm gets better performance on PR-curve. copyright © 2019, The Authors. All rights reserved.

关键词： Mapping

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Invariant cubature kalman filter for monocular visual inertial odometry with line features

arXiv

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arXiv 2019年

作者： Deli, Y.A.N. chunhui, W.U. Wang, Weiming Song, Yu Li, Shaohua State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Shijiazhuang050043 China School of Electrical and Electronic Engineering Shijiazhuang Tiedao University Shijiazhuang050043 China School of Electronic and Information Engineering Beijing Jiaotong University Beijing100044 China

To achieve robust and accurate state estimation for robot navigation, we propose a novel Visual Inertial Odometry(VIO) algorithm with line features upon the theory of invariant Kalman filtering and cubature Kalman Filter (cKF). In contrast with conventional cKF, the state of the filter is constructed by a high dimensional Matrix Lie group and the uncertainty is represented using Lie algebra. To improve the robustness of system in challenging scenes, e.g. low-texture or illumination changing environments, line features are brought into the state variable. In the proposed algorithm, exponential mapping of Lie algebra is used to construct the cubature points and the re-projection errors of lines are built as observation function for updating the state. This method accurately describes the system uncertainty in rotation and reduces the linearization error of system, which extends traditional cKF from Euclidean space to manifold. It not only inherits the advantages of invariant filtering in consistency, but also avoids the complex Jacobian calculation of high-dimensional matrix. To demonstrate the effectiveness of the proposed algorithm, we compare it with the state-of-the-art filtering-based VIO algorithms on Euroc datasets. And the results show that the proposed algorithm is effective in improving accuracy and robustness of estimation. copyright © 2019, The Authors. All rights reserved.

关键词： Kalman filters

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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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