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Numerical Simulation of Response of Pile Foundation Caused by Tunnel Excavation and Relaiability Analysis of Bearing Capacity
Author: GuoHongWei
Tutor: ZengQiaoLing
School: Beijing Jiaotong University
Course: Bridge and Tunnel Engineering
Keywords: Metro Existed Piles Bearing Capacity Reliability
CLC: TU473.1
Type: Master's thesis
Year: 2009
Downloads: 198
Quote: 0
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Abstract
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Construction of urban metro is inevitably restricted by existing environments, and many metros are built along city roads, running through pile foundations of the overpasses. Metro tunneling is certain to disturb ambient ground, and it may cause settlements or differential settlements of adjacent piles in certain range, which, if excessive, would affect the normal operation and safety of the overpass.Creating relevant numerical model based on FLAC3D, this paper analyzed response of pile group on settlement and bearing capacity caused by tunneling. Then, the paper calculated the bearing capacity and its reliability index of existed pile-group, which is carried out closely combined with Guomao subway station.By using numerical simulation method, which focus on mechanic simulation of soil-cap interaction and soil-pile interaction, the paper analyzed response on cap contact pressure、side-friction force and tip resistance of existed pile group caused by tunneling.In addition, using equal effect layerwise summation method recommended by "Technical Code for Building Foundation", the bearing capacity of 58# bridge foundation of Guomao Bridge was obtained on condition of maximum allowed settlement ruled by relevant specification.The paper calculated the statistical characteristics of variable S_T via response surface method. Then, using frictile method; reliability index of bearing capacity of 59# bridge foundation under tunneling was calculated. Furthermore, this paper analyzed how some variables affect bearing capacity, which provides an integrated method for research of similar problems.
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CLC: > Industrial Technology > Building Science > Soil mechanics,foundation engineering > Foundation > Pile foundation and deep foundation > Pile
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