A Simplified Method for Pile Load Distribution of Inverted Ladder Deformed Section Pile Group Foundation
A technology of pile group foundation and inverted ladder, which is applied in the direction of foundation structure engineering, sheet pile wall, building, etc., can solve the problem of lack of method for load distribution of pile group foundation with inverted ladder deformation section
Inactive Publication Date: 2019-04-12
EAST CHINA JIAOTONG UNIVERSITY
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However, the current "Code for Design of Railway Bridge and Culvert Foundations and Foundations" (TB10002.5-2005) and "Code for Design of Highway Bridge and Culvert Foundations and Foundations" (JTG D63-2007) all calculate the load distribution of pile group foundations for equal-section piles However, there is a lack of methods for the load distribution of this type of inverted stepped deformed section pile group foundation
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[0022] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0023] Simplified method of pile load distribution for pile group foundation with inverted stepped deformed cross-section. First, the calculation assumptions are made:
[0024] (1) The pile and the soil work together, ignoring the friction and cohesive force between the pile and the soil, the pile and the soil on the side of the pile are always in close contact before and after the force is applied;
[0025] (2) Under the action of external load, the pile foundation only produces small deformation (the displacement of the pile at the local scour line is less than 6mm), the pile and the pile side soil are both elastic media, and the stress-strain relationship of the soil conforms to the Winkel assumption;
[0026] (3) The cap is a rigid body, the pile head is embedded and fixed, the cap and the pile are rigidly connected, the pile position rem...
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The present invention discloses a simplified method for allocating foundation pile loads of a grouped pile foundation with an inverted stepped variable cross section. The method comprises: determining a ratio coefficient m value of a pile side soil body foundation; determining the calculation width b1 of a foundation pile; calculating a deformation coefficient a value of the foundation pile; and calculating loads Pi, Qi and Mi born by the top of each of grouped piles with inverted stepped variable cross sections with a current standard multi-row pile internal force calculation method, wherein the Pi is a vertical load of the top of the ith foundation pile, the Qi is a horizontal load of the top of the ith foundation pile, and the Mi is a bending moment of the top pf the ith foundation pile. The simplified method has the beneficial effects that foundation pile loads of the grouped pile foundation with the inverted stepped variable cross section can be calculated and further formation of an upper steel casing is fully exerted.
Description
technical field [0001] The invention belongs to the technical field of civil engineering, and relates to a method for simplifying load distribution of foundation piles of group pile foundations with inverted ladder deformation sections. Background technique [0002] In actual engineering, according to construction needs, bored piles generally use steel casings with a slightly larger diameter than the design, so the constructed foundation piles will inevitably appear in an inverted ladder shape with a large top and a small bottom. At the same time, under the action of horizontal load and bending moment, the bending moment of the foundation pile also shows a distribution of large up and down. The engineering designers made full use of this effect and further enlarged the casing to give full play to the upper part of the large-diameter foundation pile. bending performance. Under the action of vertical load, the inverted ladder-shaped pile will have a certain soil squeezing eff...
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IPC IPC(8): G06F17/50E02D27/12E02D5/38E02D5/66
Inventor 耿大新方焘
Owner EAST CHINA JIAOTONG UNIVERSITY