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Pile foundation bearing force recovery evaluating and calculating method

A calculation method and bearing capacity technology, applied in the direction of basic structure engineering, basic structure test, instrument, etc., can solve the problems of engineering and technical personnel, and achieve the effect of no complicated parameters, good regularity, and simple formulas

Inactive Publication Date: 2018-10-09
TIANJIN UNIV
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Problems solved by technology

In addition, the engineering practice shows that the recovery coefficient of pile foundation bearing capacity is affected by different factors and shows a certain degree of dispersion, which has caused troubles for engineering and technical personnel

Method used

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  • Pile foundation bearing force recovery evaluating and calculating method
  • Pile foundation bearing force recovery evaluating and calculating method
  • Pile foundation bearing force recovery evaluating and calculating method

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Embodiment Construction

[0028] The features of the present invention and other relevant features will be further described in detail through embodiments in conjunction with the accompanying drawings, so as to facilitate the understanding of those in the same industry.

[0029] A pile foundation bearing capacity restoration evaluation and calculation method of the present invention comprises the following steps:

[0030] Step 1: Classify the piles according to the soil conditions: the piles whose overall thickness of the cohesive soil layer in the soil around the piles is greater than or equal to 50% of the depth of the piles are defined as piles in cohesive soils, and vice versa as piles in non-cohesive soils.

[0031] Step 2. According to the pile installation method (driving, static pressure) and pile type (open, closed), the piles in cohesive soil and the piles in non-cohesive soil are further subdivided into piles driven into open piles and piles driven into closed piles. Piles and static pressur...

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Abstract

The invention discloses a pile foundation bearing force recovery evaluating and calculating method. According to soil texture conditions, piles are divided into piles in cohesive soil and piles in cohesionless soil; according to the pile installing manner and the pile type, the piles in cohesive soil and the piles in cohesionless soil are sub-divided into driving opening piles, driving closing piles and static pressure piles; pile foundation bearing force recovery data of various piles are collected and include pile foundation bearing force after pile driving is finished, time after pile driving is finished, and corresponding pile foundation bearing force; the corresponding pile foundation bearing force recovery rate is calculated and is drawn in a coordinate system; the pile foundation bearing force recovery rate and time are drawn into a dual-logarithm coordinate system, a straight line is formed through least squares fit, the intercept and the slope of the straight line are fitted and determined, and the pile foundation bearing force recovery calculation formula is derived. According to the pile foundation bearing force recovery evaluating and calculating method, the pile foundation bearing force recovery rate (Qt / Q0 / t) serves as the pile foundation bearing force recovery evaluation index, and the pile foundation bearing force at different time points is obtained.

Description

technical field [0001] The invention relates to a method, in particular to a recovery evaluation and calculation method of pile foundation bearing capacity. Background technique [0002] With the rapid development of the world economy and the rapid development of large-scale port and bridge projects, pile foundations, as a deep foundation, are more and more widely used. During the pile sinking process, the soil around the pile side is squeezed, disturbed, and reshaped, resulting in different degrees of soil squeezing effect, and at the same time, high excess pore water pressure will be generated. As a result, the pile bearing capacity increases with the prolongation of the rest period after the piling is completed. Generally, the time required to reach a stable value is dozens of days or even several years. This phenomenon is called pile foundation bearing capacity recovery (setup). That is, the bearing capacity of the pile foundation has a tendency to change with time. In...

Claims

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Application Information

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IPC IPC(8): E02D33/00
CPCE02D33/00G16Z99/00
Inventor 李飒李婷婷尹蒋松
Owner TIANJIN UNIV
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