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Method for determining treatment of pie body based on bearing capacity of single pile when rejecting hammer in subsequent piling

A technology of bearing capacity and single pile, applied in sheet pile walls, foundation structure engineering, water conservancy engineering, etc., can solve problems such as hammer rejection

Inactive Publication Date: 2008-01-16
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the recovery and improvement of the strength of the foundation soil after the hammering of the pile, the hammer rejection phenomenon of subsequent pile driving occurs, that is, the hammering number has reached or exceeded the control standard, and the pile body still cannot continue to penetrate to reach the design depth

Method used

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  • Method for determining treatment of pie body based on bearing capacity of single pile when rejecting hammer in subsequent piling
  • Method for determining treatment of pie body based on bearing capacity of single pile when rejecting hammer in subsequent piling
  • Method for determining treatment of pie body based on bearing capacity of single pile when rejecting hammer in subsequent piling

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0055] A project is located in the Bohai Sea of ​​my country, using steel pipe piles with a diameter of 1.524m, and the design penetration depth is 104m. During the driving process, the driving was stopped for 15 days when the soil depth reached about 88.7m, and the phenomenon of hammer rejection occurred during the subsequent piling. The engineering information is as follows:

[0056] (1) Some soil parameters

[0057]

layer

name

Soil description

the depth

efficient

severe

(kN / m 3 )

Design Shear Strength

(kPa)

unit pile side

friction

unit pile end

carrying capacity

layer top

(m)

layer bottom

(m)

(kPa)

(MPa)

1

very soft to soft silty clay

0.0

7.8

4

0

0.04

2.0

9.0

7.5

6

0.07

2.0

9.4

16

8

0.14...

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Abstract

The present invention belongs to a technique for judging pile body quality in the course of driving pile of ocean engineering. Said technique includes the following steps: according to pile-driving record of construction field and theoretical formula utilizing one-dimensional wave equation to simulate continuous pile-driving process, calculating to obtain relation curve of pile penetration and number of blow in pile driving, regulating calculation parameters of Qs, Qp, Sf, Jp and Js to make the calculated curve can be better fit with pile-driving record curve so as to define values of Qs, Qp, Sf, Jp and Js; using this as basis to make sequent pile-driving analysis, utilizing regulation of f and q values to simulate driving refusal phenomenon; using finally-defined f and q values to calculate actual bearing capacity of single pile, and comparing it with design-calculated bearing capacity of single pile so as to define the treatment of pile body when the sequent pile-driving is refused.

Description

technical field [0001] The invention relates to a method for determining and disposing of a pile body based on the bearing capacity of a single pile when hammering is rejected in subsequent pile driving. It belongs to the technology of judging the quality of pile body during the piling process of marine engineering. Background technique [0002] During piling construction at sea, it is often necessary to connect piles, replace piling hammers, or due to weather, ship scheduling, etc., the pile body cannot be continuously penetrated to the design depth, so the hammer stops during the construction process. In marine engineering, continuing piling construction after stopping the hammer is called subsequent piling. Due to the recovery and improvement of the strength of the foundation soil after the hammering of the pile, the hammer rejection phenomenon of subsequent pile driving occurs, that is, the number of hammering has reached or exceeded the control standard, and the pile b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D5/22E02D29/09
Inventor 刘润闫澍旺
Owner TIANJIN UNIV
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