Structural integrity assessment of shield tunnel crossing of a Railway Bridge using orthogonal experimental design

Zhao, Baoyun; Wang, Xiaoping; Zhang, Chi; Li, Wangcheng; Abbassi, Rouzbeh; Chen, Kun

doi:10.1016/j.engfailanal.2020.104594

Cited by 34 publications

(10 citation statements)

References 5 publications

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“…In [18], the indicators and standards suitable for engineering risk assessment have been proposed. (e absolute value of direct economic losses is used as an assessment standard for harmfulness, which is not applicable to the risk assessment of small and medium structures with low cost.…”

Section: Risk Matrix Expansionmentioning

confidence: 99%

Analysis of Bridge Health Detection Based on Data Fusion

Chen

Zhang

et al. 2022

Advances in Civil Engineering

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By integrating rough set theory and neural network theory, this study combined their advantages. Drawing on the existing theoretical results for bridge influencing factors, a method for numerical simulation and data fusion was used in the application of multifactor data fusion for cable-stayed bridge safety evaluation. Based on studying existing bridge safety evaluation methods, a neural network and rough set theory were combined to perform a safety evaluation of PC cable-stayed bridge cables, which provided a new means for bridge safety evaluation. First, a cable-stayed bridge in Shenyang was used as the engineering background, the safety level of its cables was divided into five levels, and a safety evaluation database was established, clustered by a Kohonen neural network. This provided specific evaluation indicators corresponding to the five safety levels. A rough neural network algorithm integrating the rough set and neural network was applied to data fusion of the database, with the attribute-reduction function of the rough set used to reduce the input dimension of the neural network. Conclusions. The neural network was then trained and the resulting trained network was applied to the safety evaluation of the cables of the cable-stayed bridge. Four specific attribute index values, corresponding to the bridge cables, were directly input to obtain the safety status of the bridge and provide corresponding management suggestions.

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Section: Risk Matrix Expansionmentioning

confidence: 99%

Analysis of Bridge Health Detection Based on Data Fusion

Chen

Zhang

et al. 2022

Advances in Civil Engineering

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“…During shield excavation, the stress of the soil near the excavation face will be changed. This causes the overall settlement of the existing building foundation, differential settlement of the foundation sections, and the associated external risks (Baoyun Zhao et al 2020). According to the Hangzhou subway construction and protection regulations, the maximum surface settlement corresponding to the quasi-rectangular shield tunneling project should be controlled within 18 mm, and the maximum surface uplift should be controlled within 5 mm.…”

Section: Environmental Control Standardmentioning

confidence: 99%

Impact Analysis for Safety Prevention and Control of Special-Shaped Shield Construction Closely Crossing Multiple Operational Metro Tunnels in Shallow Overburden

Dai

Huang

et al. 2021

Geotech Geol Eng

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With the improvement of the urban rail transit network, crossing construction has become an inevitable situation in the construction of subway tunnels. The special-shaped shield has great advantages in space utilization and the ability to cross narrow roads. However, due to its section characteristics, the special-shaped shield under construction often has a greater impact on the existing operating subway. Based on the background of quasi-rectangular shield tunneling through multiple existing tunnels, this paper proposes a two-stage safety pre-control (prevention before construction and control during construction) treatment method for large crosssection special-shaped shield construction. With three protection or auxiliary measures, the pre-reinforcement and process treatment of the crossing construction section are carried out. The effectiveness of these three measures is evaluated by establishing a 3D finite element model. Moreover, the reasonable range of construction parameters of the quasi-rectangular shield is optimized by numerical calculation. This study exposes the strata displacement law and tunnel deformation characteristics under corresponding protection or auxiliary measures and optimized construction parameters. The analysis proves that the proposed two-stage method can effectively reduce the impact of shield tunneling on the surrounding environment and existing tunnels. After applying the corresponding safety precautions, the surface uplift and tunnel uplift are reduced by about 30% on average, and the surface settlement is reduced by about 80%. Parameter optimization analysis shows that the thrust (face) pressure and grouting volume (filling rate) are more sensitive to environmental impact. It is recommended to select 100-160 kPa thrust pressure, 200% grouting filling rate, moderate grouting pressure, and slow propulsion speed in construction.

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“…With the development of urban metro construction and commercialization in downtown areas, the crossing of metro tunnels is frequently encountered in geotechnical engineering practice. e construction of newly built tunnels will inevitably bring great risks to existing operating tunnels and even result in serious engineering accidents and economic losses [1,2]. e in uence of tunnel construction on the existing metro tunnel structure is mediated by the soil layer and groundwater during the process of the new metro tunnel passing through existing operational tunnels.…”

Section: Introductionmentioning

confidence: 99%

Risk Assessment of an Existing Metro Tunnel in Close Proximity to New Shield Tunnels following Construction

Xia²,

Zhang

et al. 2022

Journal of Engineering

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The construction of a new shield tunnel near an existing operating tunnel poses a great risk to the existing tunnel structure due to the continuous encryption of the rail transit network. This study investigated the safety status of an existing metro tunnel in close proximity to new shield tunnels following construction. A fuzzy comprehensive assessment model (hierarchical fuzzy comprehensive evaluation model) based on an analytic hierarchy process was proposed to assess the risks of the existing tunnel structure. The threshold of indicators in the existing tunnel structure risk assessment system was determined based on the tunnel function and structure security. Then, we described the membership vector determination method, weight vector determination method, and comprehensive evaluation vector processing method. Taking a project case in China as the research object, the quantitative analysis of the established evaluation system was carried out, and the intuitive risk assessment results were obtained. The hierarchical fuzzy comprehensive evaluation model can be employed as a decision-making tool for newly built shield tunnels passing through the existing tunnels, which can provide guidance for tunnel maintenance and guarantee.

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Structural integrity assessment of shield tunnel crossing of a Railway Bridge using orthogonal experimental design

Cited by 34 publications

References 5 publications

Analysis of Bridge Health Detection Based on Data Fusion

Analysis of Bridge Health Detection Based on Data Fusion

Impact Analysis for Safety Prevention and Control of Special-Shaped Shield Construction Closely Crossing Multiple Operational Metro Tunnels in Shallow Overburden

Risk Assessment of an Existing Metro Tunnel in Close Proximity to New Shield Tunnels following Construction

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