FEM investigations of dynamic effects in geosynthetic reinforced walls under various seismic characteristics

• Main Authors: Tak-ChungHui, 許德仲
• Other Authors: Ching Hung
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/73599j

碩士 === 國立成功大學 === 土木工程學系 === 107 === This paper presents dynamic effects on numerical models of geosynthetic reinforced walls considering wrapped or rigid faces, using a Finite-element approach. Development of the numerical models for simulating the published results on seismic responses are firstly presented. Then, it is scaled up to a size of 3 m high and 5.65 m long geosynthetic reinforced wall models with both wrapped and rigid faces. 0.1g to 0.5g sinusoidal waves with frequency from 3 Hz, 5 Hz, 7 Hz, 9 Hz, and the Chi-chi earthquake from Taiwan and the Kobe earthquake from Japan, are applied. The results show that for the rigid faced reinforced wall models, the acceleration (A_rms) amplifications increase with increasing of seismic energy under low frequency (3 Hz) sinusoidal waves. All of the models show that the acceleration amplifications increase with the increasing of seismic energy under real earthquakes. There are different tendencies between the results of wrapped and/or rigid face walls according to the two real earthquakes. There are similar tendencies between wall face deformations and maximum reinforcement strains because of the interaction between the soil and reinforcement. All of the maximum of reinforcement strain obtained by the models are lower than 5 %. It is found that the reinforcements are stiffness enough to handle any situations in study.