Vibration Reduction of Layered Sandbags under Traffic Load
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ORIGINAL PAPER
Vibration Reduction of Layered Sandbags under Traffic Load Chenli Shen . Guangya Ding
. Xiaowei Lai
Received: 10 October 2019 / Accepted: 20 October 2020 Ó Springer Nature Switzerland AG 2020
Abstract In this study, a new type of traffic load test device was adopted to investigate the vibration isolation of layered sandbags under train load. The upper part of this device is composed of five high performance hydraulic actuators, to simulate the traffic load produced by train movement. First, sandbags were stacked on the subgrade, which were used as an active vibration isolation barrier. The variations of the soil stress, acceleration and vertical deformation of the sandbag subgrade were analysed by simulating different train speeds, and the relationship between the surface acceleration and train load was established. The attenuation of surface acceleration with depth was further analysed. Then, expanded polystyrene (EPS) foam plates with different thicknesses (placed at a certain distance from the subgrade) were used as a passive vibration isolation barrier. The vibration isolation effect of the EPS foam plate was also analysed. Results show that the sandbag layer used as a subgrade exhibited good vibration isolation C. Shen G. Ding (&) College of Civil Engineering and Architecture, Wenzhou University, Chashan University Town, Wenzhou, China e-mail: [email protected] C. Shen e-mail: [email protected] X. Lai Wenzhou Branch, Zhejiang Engineering Survey Institute, Wenzhou, China e-mail: [email protected]
effect. At a train load of 15 kN, the acceleration at a depth of 25 cm is less than that at the roadbed surface. The faster the train speed, the higher the acceleration attenuation rate. Keywords Reduction
Vibration Sandbag Subgrade
1 Introduction Sandbags have advantages of wide selection of materials, low cost, and convenient construction. The use of sandbags on railway subgrade can reduce the impact of train vibration on the surrounding environment. It also can improve the bearing capacity and reduce the deformation and settlement of the railway. Several studies have investigated techniques for passive vibration reduction. Woods (1968) proposed some basic guidelines for the design of a trench barrier based on a large number of tests, and the amplitude attenuation coefficient was used for the first time to evaluate the vibration reduction effect of a barrier. Murillo et al. (2009) conducted a centrifugal model test of vibration isolation in a sand layer using expanded polystyrene (EPS) foam material, and showed that the vibration isolation effect of EPS foam barrier depends mainly on the depth of the barrier.
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Geotech Geol Eng
Celebi et al. (2009) conducted a series of basic on-site vibration isolation experiments using empty trenches and filled trenches as barriers. The calculation results showed that for trenches filled with low-wave impedance materials, passive vibration isolation was more effective than active vibration isol
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