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Study on Settlement Characters of Composite Foundation under Train Load

Author: JiLin
Tutor: LiuYing
School: Beijing Jiaotong University
Course: Geological Engineering
Keywords: Train load CFG pile composite foundation Settlement characteristics Low Embankment FLAC3D
CLC: U213.1
Type: Master's thesis
Year: 2011
Downloads: 110
Quote: 0
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Abstract


In recent years, the rapid development of China 's high-speed railway construction . In this process , the the subgrade settlement issue has become one of the most unfavorable factors restricting the high-speed railway , high - quality construction . Currently, widely used in China CFG pile composite foundation treatment of soft soil area railway embankment settlement problem . With the increasing speed of trains , train load will have an adverse impact on the railway embankment and the underlying CFG pile composite foundation settlement , so CFG pile composite foundation settlement characteristics of research under train loads has important practical significance . PDL, Wuhan engineering background of the test section , we collect the construction of the test section of CFG pile composite foundation settlement observations and measured earth pressure - time history data characterize the dynamic loads generated by the train . On this basis , the paper under train loads of CFG pile composite foundation settlement characteristics of in-depth analysis , the main research work are as follows : 1. Composite modulus and layered summation and train load is equivalent to ZK live load train loads of CFG pile composite foundation settlement design calculations ; based on the finite difference software FLAC3D , combined with the geology of the test section in Wuhan , roadbed material , the subgrade settlement simulation model ; 3. FLAC3D simulation of embankment fill building - heap preloading - unloading standing stage of CFG pile composite foundation settlement changes and distribution rules , and comparison of the data with the actual settlement observations , verify the reliability of the model ; measured earth pressure - time history data , under the to the FLAC3D simulation model of the train loads , different speeds , different embankment height of CFG pile composite foundation settlement characteristics and power attenuation characteristics ; 5 . combined with the low embankment engineering background Wuhan test section , for the most unfavorable the load combinations form of CFG pile composite foundation improvement programs .

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CLC: > Transportation > Rail transport > Railway Line Project > Line constructed > Subgrade
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