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| VIBRATION SCREENING EFFECT OF IN-FILLED TRENCHES ON TRAIN DYNAMIC LOADS OF GEOMETRIC IRREGULAR TRACK IN
LAYERED GROUNDS |
| CHEN Gongqi1，2，GAO Guangyun1，2 |
| (1. Department of Geotechnical Engineering，Tongji University，Shanghai 200092，China；2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education，Tongji University，Shanghai 200092，China) |
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Abstract A 2.5D finite element method(FEM) model of train-track-ground is built to analyze the train induced ground vibration with geometric irregular track. Then the expression of train loads is obtained implicitly by simplifying the track as an Euler beam resting on the layered ground. The 2.5D finite element formulas are derived by taking the in-filled trench as heteroplasmon. The screening of in-filled trench on ground under moving train load at high-speed and low-speed is analyzed. Then the parameters of in-filled trench are analyzed in detail. The parameters herein include the width，depth，distance and materials of the in-filled trench. The results show that，the screening as train runs at high-speed is better than that at low-speed train. In addition，increasing the depth and width of the in-filled trench can improve the screening under moving train load；vibration enhancement area appears in a certain range in front of the trench；the isolation effectiveness of nonrigid materials is better than that of concrete in front and back of the trench. The results will contribute to the theoretical and technical development of the screening of ground vibration induced by train load.
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Received: 24 August 2012
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MAO Yuting1, 2, HE Manchao1, 2, LIU Fangzhou3, BAI Xing4, YANG Xiaojie1, 2, TAO Zhigang1, 2*. Development and application of a large-scale physical model system for tunnel creep testing[J]. , 2026, 45(6): 1627-1638. |
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2014, Vol. 33 
