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Study on Bearing Properties of Large-diameter and Super-long Bored Piles with Tip Post-grouting

Author: WangShengZhong
Tutor: ZhuXiangRong；WangWenJun；YeJunNeng
School: Zhejiang University
Course: Geotechnical Engineering
Keywords: Large diameter Bored The pile end after grouting Bearing characteristics Load transfer function model Finite Element
CLC: U443.15
Type: Master's thesis
Year: 2010
Downloads: 180
Quote: 1
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Abstract


Large diameter Bored pile length due to its high bearing capacity is widely used in large-scale projects in the high-rise building, Bridge, improve ultimate bearing capacity, at the same time can be shortened in order to reduce the impact of sediment and mud skin reduce cost, widespread adoption of the pile end grouting technology. On the basis of previous work, test data analysis and numerical simulation method of Large Diameter Bored pile pile end grouting bearing characteristics. First, the combination of the large diameter of the Hangzhou Bay Bridge Bored self-balanced pile test data, single pile vertical load before and after grouting the pass traits distinction load of box depth of the sediment pile end grouting amount of pile end load transfer traits. The research results show that the pile end grouting of the soil side of the end resistance near the pile end resistance play features a greater impact, pile load transfer to traits with the load box depth and grouting the size, sediment thickness after grouting pile end limit displacement of greater impact, less impact on the ultimate tip resistance. Secondly, the existing pile end grouting bored pile ultimate bearing capacity calculation methods are summarized, applicable to the Large Diameter Bored Pile Tip Grouting ultimate bearing capacity formula, combined with the test pile The data given in the Hangzhou Bay Bridge area pile end grouting lateral resistance, tip resistance enhancement factor common pile end grouting drilling pile ultimate bearing capacity calculation formula results verified by comparison. Third, according to the characteristics before and after grouting vertical load transfer traits proposed lateral resistance of the before and after grouting end resistance load transfer function model for Large Diameter Bored pile characteristics and traditional load transfer law inadequate consider a \Finally, based on the ABAQUS finite element analysis software, on the assumption that the grout for the same cylinder diameter pile diameter, soil Mohr-Coulomb model pile and grouting body elastic model conditions, the numerical simulation of grouting volume with the aspect ratio of the large-diameter bored pile ultimate bearing capacity of pile end grouting. The results show that the aspect ratio on the ultimate bearing capacity significantly compared to the grouting volume grouting the larger the amount, the aspect ratio of the smaller the larger ultimate bearing capacity, there are optimal grouting volume and optimal aspect ratio. ultimate bearing capacity of slow growth when grouting amount more than the optimal grouting or aspect ratio less than optimal aspect ratio.

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CLC: > Transportation > Road transport > Bridges and Culverts > Bridges constructed > Bridge Foundation > Pile
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