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|Title: ||Effect of Vertical Drain Methods on The Soil Liquefaction|
|Authors: ||陳德富;Phu,Tran Duc|
|Keywords: ||離心模型試驗研究;土壤液化;垂直排水系統;Centrifuge modelling;soil liquefaction;vertical drain systems|
|Issue Date: ||2016-10-13 12:12:15 (UTC+8)|
;It was observed that liquefaction induced by earthquake causes series damages to buildings and threatens the people and their properties. A majority of countermeasures were proposed to reduce the build-up of excess pore water pressure and to enhance the stiffness of the soil during earthquake against soil liquefaction. The vertical drain systems are well known methods which is to provide rapidly shorter dissipation path of water by the use of higher permeability material playing role as vertical drain and it can be installed through the liquefiable soil layers against earthquake-induced soil liquefaction. In this study, the purpose is to clarify the effect of vertical drain methods on the soil liquefaction by high quality centrifuge modeling. Several centrifuge modelling experiments were performed including geosynthetic belt drains and pile sand drains as vertical drains in improved model. By the use of centrifuge data supported, two arrays of accelerometers, the pore water pressure transducers and several displacement transducers were assembled to examine the shear wave propagation, predominant frequency, pore water pressure tendency and ground displacement (on horizontal and vertical plane) and utilize suitable software to describe the physical data meaning become more obvious. According to the test results, it was observed that the vertical drain systems could reduce the excess pore water pressure ratio significantly under seismic loading and fasten dissipation process by providing rapidly water flow path, thereupon seemingly leading curtail surface settlement of soil and angular distortion of building thank to lower excess pore water pressure.
Keywords: Centrifuge modelling, soil liquefaction, vertical drain systems.
|Appears in Collections:||[土木工程研究所] 博碩士論文|
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