检索结果-南通市图书馆

Comparative Analysis of ARIMA and LSTM Model-Based Anomaly Detection for Unannotated Structural Health Monitoring Data in an immersed tunnel

引用

Computer Modeling in Engineering & Sciences 2024年第5期139卷 1797-1827页

作者： Qing Ai Hao Tian Hui Wang Qing Lang Xingchun Huang Xinghong Jiang Qiang Jing School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong UniversityShanghai200240China Key Laboratory of Road and Bridge Detection and Maintenance Technology of Zhejiang Province Hangzhou311305China Zhejiang Scientific Research Institute of Transport Hangzhou310023China State Key Laboratory of Coal Mine Dynamics and Control Chongqing UniversityChongqing400044China Hong Kong-Zhuhai-Macao Bridge Authority Zhuhai519060China

Structural Health Monitoring(SHM)systems have become a crucial tool for the operational management of long *** immersed tunnels exposed to both traffic loads and the effects of the marine environment,efficiently identifying abnormal conditions from the extensive unannotated SHM data presents a significant *** study proposed amodel-based approach for anomaly detection and conducted validation and comparative analysis of two distinct temporal predictive models using SHM data from a real immersed ***,a dynamic predictive model-based anomaly detectionmethod is proposed,which utilizes a rolling time window for modeling to achieve dynamic *** the assumption of temporal data similarity,an interval prediction value deviation was employed to determine the abnormality of the ***,dynamic predictive models were constructed based on the Autoregressive Integrated Moving Average(ARIMA)and Long Short-Term Memory(LSTM)*** hyperparameters of these models were optimized and selected using monitoring data from the immersed tunnel,yielding viable static and dynamic predictive ***,the models were applied within the same segment of SHM data,to validate the effectiveness of the anomaly detection approach based on dynamic predictive modeling.A detailed comparative analysis discusses the discrepancies in temporal anomaly detection between the ARIMA-and LSTM-based *** results demonstrated that the dynamic predictive modelbased anomaly detection approach was effective for dealing with unannotated SHM *** a comparison between ARIMA and LSTM,it was found that ARIMA demonstrated higher modeling efficiency,rendering it suitable for short-term *** contrast,the LSTM model exhibited greater capacity to capture long-term performance trends and enhanced early warning capabilities,thereby resulting in superior overall performance.

关键词： Anomaly detection dynamic predictive model structural health monitoring immersed tunnel LSTM ARIMA

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Experimental Study on Mooring,Towing and Installing of immersed tunnel Caissons

引用

Journal of Shanghai Jiaotong university(Science) 2010年第1期15卷 103-107页

作者：肖龙飞杨建民李润培 State Key Laboratory of Ocean Engineering Shanghai Jiaotong University

Mooring,towing and installing tests on immersed tunnel caissons across the Yong River are carried out in basin to investigate the motions and line *** the towing operation,the maximum tension exists in the case that half caisson is exposed to waves and *** cooperation of operating manually on many lines at the same time is very difficult and *** dynamic behavior of the caisson and the line tensions are affected more by the manual operations than by waves and *** the installing operation,the tensions of hoisting lines are much larger than the positioning lines.

关键词： immersed tunnel caisson installation model test

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Evaluation on the state of sand filling layer and the influence on segment deformation of immersed tunnels

引用

Underground Space 2024年第3期16卷 224-238页

作者： Ziyao Xu Ailan Che Chao Su School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China CCCC Second Harbor Engineering Company Ltd. Wuhan 430040China

The immersed tunnel is considered an effective solution for traffic problems across rivers and *** sand filling layer,as an important part of immersed tunnel foundation treatments,directly affects segment attitude *** to difficulties in quality control of concealed construction and the complex hydrodynamic environment,the sand filling layer is prone to compaction defects,further leading to changes in segment ***,limited by structural concealment and state complexity,most studies consider the sand filling layer part of the foundation to study its impact on settlement while neglecting its influence on segment *** research proposes an evaluation method for the sand filling layer state based on elastic wave testing and the elastic wave characteristic parameters selected come from analysis of the time domain,frequency domain and time–frequency *** classifying the elastic wave characteristic parameters through the K-means clustering method,the relationship between the state of the sand filling layer and the elastic wave characteristic parameters is *** state of the sand filling layer is divided into dense,incompact,and void.A numerical model is established based on the Guangzhou BI-UT immersed tunnel with incompact and void sand filling layer states to simulate deformation and *** results indicate that the settlement of the tunnel segment is low in the eastern region and high in the western region due to the presence of a less dense sand filling layer,with a maximum differential settlement of 0.04 *** evaluation method plays a crucial role in guiding the construction of immersed tube tunnels.

关键词： Sand filling layer state immersed tunnel Elastic wave test Clustering algorithm

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Enhanced elastic beam model with BADS integrated for settlement assessment of immersed tunnels

引用

Underground Space 2023年第5期12卷 79-88页

作者： Cong Tang Shu-Yu He Zheng Guan Wan-Huan Zhou Zhen-Yu Yin State Key Laboratory of Internet of Things for Smart City and Department of Civil and Environmental Engineering University of MacaoTaipaMacao 999078China Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong Kong 999077China

Excessive settlement may induce structural damage and water leakage in immersed tunnels,seriously threatening the tunnels’***,making accurate assessment of the settlement in immersed tunnels is difficult due to the incomplete knowledge of the geotechnical parameters and the inadequacy of the model *** paper proposes an effective method to accurately assess the settlement in immersed *** enhanced beam on elastic foundation model(E-BEFM)is developed for the settlement assessment,with the Bayesian adaptive direct search algorithm adopted to estimate unknown model parameters based on previous *** proposed method is applied to a field case of the Hong Kong–Zhuhai–Macao immersed *** original BEFM is used for comparison to highlight the better assessment performance of E-BEFM,particularly for joints’differential *** show that the proposed method can provide accurate predictions of the total settlement,angular distortion(a representation of tubes’relatively differential settlement),and joints’differential settlement,which consequently supports the associated maintenance decision-making and potential risk prevention for immersed tunnels in service.

关键词： immersed tunnel Settlement Beam on elastic foundation model Bayesian adaptive direct search Hong Kong-Zhuhai-Macao tunnel

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

TIME-DOMAIN RESPONSES OF IMMERSING tunnel ELEMENT UNDER WAVE ACTIONS

引用

Journal of Hydrodynamics 2009年第6期21卷 739-749页

作者： CHEN Zhi-jie WANG Yong-xue WANG Guo-yu HOU Yong State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology Dalian 116024 China CCCC-FHDI Engineering Co. Ltd Guangzhou 510230 China

The time domain responses of the tunnel element under wave actions during its immersion are investigated based on the linear wave diffraction theory. The integral equation is derived by using the time-domain Green function that satisfies the free water surface condition in the finite water depth, and is solved by the boundary element method. The motion equations of the tunnel element are solved by the fourth order Runge-Kutta method. A comparison between the computed and measured results reveals that the numerical model can effectively simulate the motion responses of the tunnel element and the cable tensions when the motions of the tunnel element are within some limit. Taking the tunnel element of 100 m in length, 15 m in width and 10 m in height as an example, the computational results of the motion responses of the tunnel element and the cable tensions in different immersing depths are obtained under different incident wave conditions.

关键词： immersed tunnel time-domain response cable tension boundary element method

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Typical Underwater tunnels in the Mainland of China and Related tunneling Technologies

引用

Engineering 2017年第6期3卷 871-879页

作者： Kairong Hong State Key Laboratory of Shield Machine and Boring Technology China Railway Tunnel Group Co. Ltd. Zhengzhou 450001 China

In the past decades, many underwater tunnels have been constructed in the mainland of China, and great progress has been made in related tunneling technologies. This paper presents the history and state of the art of underwater tunnels in the mainland of China in terms of shield-bored tunnels, drill-and-blast tunnels, and immersed tunnels. Typical underwater tunnels of these types in the mainland of China are described, along with innovative technologies regarding comprehensive geological prediction, grouting-based consolidation, the design and construction of large cross-sectional tunnels with shallow cover in weak strata, cutting tool replacement under limited drainage and reduced pressure conditions, the detection and treatment of boulders, the construction of underwater tunnels in areas with high seismic intensity, and the treatment of serious sedimentation in a foundation channel of immersed tunnels. Some suggestions are made regarding the three potential great strait-crossing tunnels-the Qiongzhou Strait-Crossing tunnel, Bohai Strait-Crossing tunnel, and Taiwan Strait-Crossing tunnel--and issues related to these great strait-crossing tunnels that need further study are proposed.

关键词： Underwater tunnel Strait-crossing tunne Shield-bored tunnel immersed tunnel Drill and blast

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Establishment of Nanchang Honggu tunnel health monitoring and assessment system

引用

Journal of Southeast University(English Edition) 2019年第2期35卷 206-212页

作者： Xu Xiangchun Liu Songyu Tong Liyuan Institute of Geotechnical Engineering Southeast UniversityNanjing 211189China

Based on the background of the Nanchang Honggu tunnel,which is the largest inland river immersed tunnel to date in China,some research work on the construction of the Nanchang Honggu tunnel health monitoring and assessment system is *** platform of the health monitoring and assessment system is established with a relatively mature structure,including the sensor subsystem,data acquisition subsystem,data transmission subsystem,database subsystem,data processing and control subsystem,and health assessment and pre-warning *** index selection,sensor selection and sensor layout are fully considered in the health monitoring design and technology *** fuzzy-AHP(analytic hierarchy process)evaluation method is employed to establish the Honggu tunnel health assessment model,and the index weight determination method and grading control criterion are investigated and ***,the functions of the software system are achieved with advanced cloud platform technology,and the running costs of the system is reduced *** summary,the establishment of the Nanchang Honggu tunnel health monitoring and assessment system is described and such a system can realize real-time monitoring of the Honggu tunnel and make it more convenient for implementing health assessment,pre-warning,and some other *** can operate the system using PCs and cell *** the same time,the relevant work on this system can provide a good reference for other immersed tunnels.

关键词： immersed tunnel health monitoring system platform analytic hierarchy process(AHP)model

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Frequency responses of immersing tunnel element under wave actions

引用

Journal of Marine Science and Application 2009年第1期8卷 18-26页

作者：陈智杰王永学王国玉侯勇大连理工大学海岸和近海工程国家重点实验室辽宁大连116024

The immersion of large-scale tunnel elements is one of the most important working procedures in the construction of an underwater immersed tunnel. To investigate the dynamic characteristics of tunnel element in the process of immersion, based on the twin-barge immersing operation method, the frequency-domain analysis of the tunnel element motions under wave actions was made. The linear wave diffraction theory and the three-dimensional source distribution method were applied to calculate the wave loads and motion responses of the tunnel element under different incident wave conditions. In the study, movement of the two barges in the water was assumed to be small and was ignored. Cable tension was computed by the static method. On the basis of the above theories, a computer program was made, and two cases were taken to check the validity of the program. The results showed that wave loads acting on the immersed tunnel element are relatively large near the water surface, and they decrease with the increase of immersing depth of the tunnel element. Wave loads first increase, then decrease, with the increase of wave period. The motion responses of the tunnel element are also generally large near the water surface and decrease as the immersing depth increases.

关键词： immersed tunnel motion response frequency domain linear potential theory

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：