Dynamic Response of a Heavy-Haul Railway Tunnel’s Bottom Structures in Hard Rock
Source abstract
Abstract
A train–tunnel–surrounding rock numerical model was established by using ABAQUS to analyze the dynamic response of a heavy-haul railway tunnel in hard rock, quantify the influence of the train axle load on the tunnel dynamic response and determine its potential vulnerable position. The results suggested that: Under the 30 t train load and surrounding rock pressure coupling, the maximum principal stress caused by rock pressure was 1.27 MPa, located at the bottom of the structure below the side drain; the maximum dynamic response of the tunnel structure and base rock was located directly below the rail. The lower part of the side drain and rail was the vulnerable position in the tunnel bottom structure, and the probability of base disease under the rail may be higher than that in soft-rock tunnels, for it has a greater dynamic response and thinner structure compared to a soft-rock tunnel. The maximum principal stress amplitude of the tunnel structure and base rock were 129.3 kPa and 43.0 kPa, respectively. When the axle load increased by 1 t, the dynamic amplitude of the structure’s maximum principal stress increased by about 4.14 kPa, and the base rock’s maximum principal stress increased by about 1.33 kPa. The rock pressure was not negligible in the dynamic analysis of the railway tunnel, and the dynamic response of the tunnel bottom structure and base rock will decrease, obviously, when the rock pressure is ignored.
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Research context
OpenAlex topics: Railway Engineering and Dynamics · Geotechnical Engineering and Underground Structures · Geotechnical Engineering and Analysis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Geological Survey of Jiangxi Province, Nanchang 330001, China
School of Civil and Architectural Engineering, East China University of Technology, Nanchang 330013, China
School of Civil Engineering, Central South University, Changsha 410075, China
School of Road and Bridge engineering, Jiangxi Transportation Vocational and Technical College, Nanchang 330013, China
Jiangxi Institute of Survey and Design, Nanchang 330224, China
Funding
Science and Technology Research Project of Jiangxi Provincial Department of Education · Science and Technology Project of Jiangxi Transportation Department · National Science of China · Natural Science Foundation of Jiangxi Province · “Double Thousand Plan” Innovation Leading Talent Project of Jiangxi Province · East China University of Technology
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