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http://dx.doi.org/10.12989/gae.2020.20.2.103

Dynamic response characteristics of crossing tunnels under heavy-haul train loads  

Dong, Jie (College of Civil Engineering, Hebei University of Architecture)
Zhong, Shuai (College of Civil Engineering, Hebei University of Architecture)
Wang, Hai-long (College of Civil Engineering, Hebei University of Architecture)
Wu, Zhi-hui (School of Civil Engineering, Chongqing University)
Publication Information
Geomechanics and Engineering / v.20, no.2, 2020 , pp. 103-112 More about this Journal
Abstract
The dynamic response of crossing tunnels under heavy-haul train loads is still not fully understood. In this study, based on the case of a high-speed tunnel underneath an existing heavy-haul railway tunnel, a model experiment was performed to research the dynamic response characteristics of crossing tunnels. It is found that the under-crossing changes the dynamic response of the existing tunnel and surrounding rock. The acceleration response of the existing tunnel enhances, and the dynamic stress of rock mass between crossing tunnels decreases after the excavation. Both tunneling and the excitation of heavy-haul train loads stretch the tunnel base, and the maximum tensile strain is 18.35 µε in this model test. Then, the measured results were validated by numerical simulation. Also, a parametric study was performed to discuss the influence of the relative position between crossing tunnels and the advanced support on the dynamic behavior of the existing tunnel, where an amplifying coefficient of tunnel vibration was introduced to describe the change in acceleration due to tunneling. These results reveal the dynamic amplifying phenomenon of the existing tunnel during the new tunnel construction, which can be referred in the dynamic design of crossing tunnels.
Keywords
crossing tunnels; heavy-haul train loads; dynamic response; model experiment; numerical simulation;
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Times Cited By KSCI : 3  (Citation Analysis)
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