Determination method of bearing capacity of overlong bored pile

A technique for bored piles, determination methods, applied in sheet pile walls, special data processing applications, instruments, etc.

Inactive Publication Date: 2013-08-28
RES INST OF HIGHWAY MINIST OF TRANSPORT
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Problems solved by technology

[0011] The invention provides a method for designing super-long bored piles according to the principle of stiffness coordination, which so

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  • Determination method of bearing capacity of overlong bored pile
  • Determination method of bearing capacity of overlong bored pile
  • Determination method of bearing capacity of overlong bored pile

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Embodiment Construction

[0036] The traditional fixed value design method regards the bearing capacity of the pile foundation as a fixed value, and uses the total safety factor K to measure the safety (reliability) of the pile foundation. In fact, for pile foundations with different geological conditions and different soil layers that bear different loads (the ratio of dead load to live load, etc.), the actual reliability is different under the same safety factor. not clear. Because of the load effect S resistance R is a random variable. by figure 1 The S, R frequency distribution curve shown, the traditional safety factor is: K=μ R / μ s .

[0037] From figure 1 It can be seen that S and R are around the mean R 0 =μ R , S 0 =μ S It changes regularly, so for the same soil and the same pile type, the actual safety factor K is also non-fixed. For different soils and different pile types, the variability of R is different. When the same safety factor κ is used for design, the actual safety is different, ...

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Abstract

The invention provides a determination method of the bearing capacity of an overlong bored pile. The method comprises the following steps that the total stiffness of pile soil is determined, and a standard value of the frictional resistance of the pile side of each layer of pile soil and a standard value of the counterforce of the pile bottom are determined in accordance with engineering needs; a mathematically traditional fitting method is utilized to determine a hyperbolic function passing parameter of the pile side of each layer of the pile soil and determine a hyperbolic function passing parameter of the pile bottom of each layer of the pile soil; a length measuring device is utilized to determine the pile diameter D; the subsection length of a pile body is determined in accordance with the requirement of calculation accuracy, and each subsection corresponds to one layer of the pile soil; the frictional resistance of the pile side on the subsection length of each pile body is calculated one by one, and a control value of the frictional resistance of the pile side is determined; and whether a control value of the counterforce of the pile bottom and the vertical bearing capacity of a pile foundation meet the conditions or not is determined, thereby determining the bearing capacity of the overlong bored pile. By using the determination method of the bearing capacity of the overlong bored pile, the defects in aspects of bearing property analysis and parameter selection calculation of the overlong bored pile in the prior art can be overcome.

Description

Technical field [0001] The invention relates to a method for analyzing the bearing shape of a bored pile foundation, and more specifically to a method for determining the bearing capacity of an ultra-long bored pile. Background technique [0002] The current "Code for Design of Highway Bridges and Culvert Foundations and Foundations" JTG D63-2007 for the standard value of the lateral friction resistance of the side soil of bored piles still uses the values ​​in the "Code for Design of Highway Bridges and Culverts Foundations and Foundations" JTJ024-85. These values ​​are determined based on the data of 105 test piles before the 1980s. From the perspective of the use effect, the result is relatively conservative. If it is directly used in the design calculation of super-long piles, there may be safety hazards; and in theory, there are the following problems: [0003] (1) The composition of the bearing capacity of the pile foundation: [0004] From the pile circumference friction (ul...

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Application Information

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IPC IPC(8): E02D33/00E02D5/34G06F17/50
Inventor 马晔宋春霞张学峰
Owner RES INST OF HIGHWAY MINIST OF TRANSPORT
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