Seismic response of a reinforced railway embankment traversing a fault zone
Zhiyi Cong,Chao Cao,Yuliang Lin,Xiaojing Li,Hongri Zhang,Guolin Yang
Abstract
The reinforced railway embankments traversing fault zones are susceptible to severe seismic damage, which could disrupt normal railway operation. This paper investigates the seismic response of reinforced railway embankment situated in a fault zone in China. The seismic response characteristics of reinforced railway embankment under strike-slip and reverse fault movement are investigated by means of shaking table tests and 3D numerical simulations. A dual-shaking table test was employed to simulate different seismic loading on either side of the fault, and a full-scale numerical model was established by using FLAC3D software. The results between shaking table test and numerical simulation are compared in terms of the acceleration amplification effects, horizontal displacements, and settlement behavior of the foundation. It is indicated that the impact of strike-slip fault motion on embankment is considerably more significant than that of reverse fault motion. The horizontal acceleration is the most amplified at the midpoint of slope, while the amplification effect of vertical acceleration is mostly observed at the base of slope. The amplification coefficient decreases non-linearly as the earthquake magnitude increases. Strikeslip fault motion leads to asymmetric displacement and tilting on both sides of the embankment, while reverse fault motion causes differential settlement along the railway alignment.
Key Words
crossing-fault; numerical simulation; reinforced embankment; shaking table test
Address
Zhiyi Cong — School of Civil Engineering, Central South University, Changsha, 410075, China; National Engineering Research Center of High-speed Railway Construction Technology, Central South University, Changsha, 410075, China
Chao Cao — China Construction Fifth Engineering Bureau Co. Ltd., Changsha, 410019, China
Yuliang Lin — School of Civil Engineering, Central South University, Changsha, 410075, China; National Engineering Research Center of High-speed Railway Construction Technology, Central South University, Changsha, 410075, China
Xiaojing Li — China Construction Fifth Engineering Bureau Co. Ltd., Changsha, 410019, China
Hongri Zhang — Guangxi Transportation Science and Technology Group Co. Ltd., Nanning, 530029, China
Guolin Yang — School of Civil Engineering, Central South University, Changsha, 410075, China
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