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A method for converting o-cell test pile load into vertical compression pile load

A vertical and test pile technology, which can be used in basic structure testing, construction, infrastructure engineering and other directions, and can solve problems such as low bearing capacity.

Active Publication Date: 2019-03-26
HANGZHOU SOUTHWEST DETECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for converting the load of an improved O-cell test pile into a vertical compression pile load, and improve the calculation of the bearing capacity of the lower section of the existing compression pile to solve the problems calculated in the above-mentioned background technology The problem that the bearing capacity is less than the actual bearing capacity

Method used

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  • A method for converting o-cell test pile load into vertical compression pile load
  • A method for converting o-cell test pile load into vertical compression pile load
  • A method for converting o-cell test pile load into vertical compression pile load

Examples

Experimental program
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Effect test

Embodiment 1

[0037] A method of converting O-cell test pile load into vertical compression pile load:

[0038] 1. The pile body used is l / d=30, the diameter of the pile is 500mm, the length of the pile is 15m, and the weight of the pile body is 70.7kN, acting on cohesive soil, so λ 上 = 1.25, the internal friction angle of the soil around the pile is 15°, and the end resistance of the soil at the pile end is 2000kPa.

[0039]2. The carrying capacity conversion data according to this method are shown in Table 1-1 below:

[0040] Table 1-1

[0041]

[0042] 3. Comparative experiment:

[0043] The load converted by the O-cell method, the converted load obtained in Example 1, and the vertical compressive load on the top of the pile obtained by the traditional method were compared (the same pile body as in Example 1 was selected).

[0044] The load converted by the O-cell method, the conversion obtained in Example 1 and the comparison of the vertical compressive load on the top of the pile...

Embodiment 2

[0049] A method of converting O-cell test pile load into vertical compression pile load:

[0050] 1. The pile body l / d=60, the diameter of the pile is 500mm, the length of the pile is 30m, and the weight of the pile body is 141.3kN, acting on cohesive soil, so λ 上 = 1.25, the internal friction angle of the soil around the pile is 15°, and the end resistance of the soil at the pile end is 2200kPa.

[0051] 2. The bearing capacity conversion data according to this method are shown in Table 2-1 below:

[0052] Table 2-1

[0053]

[0054] 3. Comparative experiment:

[0055] The load converted by the O-cell method, the converted load obtained in Example 2, and the vertical compressive load on the top of the pile obtained by the traditional method were compared (the same pile body as in Example 2 was selected).

[0056] The load converted by the O-cell method, the comparison between the converted load obtained in Example 2 and the vertical compressive load on the top of the pi...

Embodiment 3

[0061] A method of converting O-cell test pile load into vertical compression pile load:

[0062] 1. The pile body used is l / d=90, the diameter of the pile is 500mm, the length of the upper section of the pile is 45m, and the weight of the upper section of the pile is 212.0kN, acting on cohesive soil, so λ 上 = 1.25, the internal friction angle of the soil around the pile is 15°, and the end resistance of the soil at the pile end is 2500kPa.

[0063] 2. The bearing capacity conversion data according to this method are shown in Table 3-1 below:

[0064] Table 3-1

[0065]

[0066] 3. Comparative experiment:

[0067] The load converted by the O-cell method, the converted load obtained in Example 3, and the vertical compressive load on the top of the pile obtained by the traditional method were compared (the same pile body as in Example 3 was selected).

[0068] The load converted by the O-cell method, and the comparison between the converted load obtained in Example 3 and t...

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Abstract

The invention discloses a method for converting an O-cell test pile load into a vertical compressive pile load in the technical field of pile foundation tests in civil engineering. The method for converting the O-cell test pile load into the vertical compressive pile load comprises the following steps: S1, defining a pile; S2, acquiring a downward compressive bearing capacity of an upper section pile under the action of the ith level load; S3, acquiring a downward compressive bearing capacity of a lower section pile under the action of the ith level load; and S4, acquiring a pile block vertical compressive bearing capacity Qi under the action of the ith level load. The method disclosed by the invention can count overload loss caused by an up-holding force in, so that the end resistance of pile end soil of the lower section pile is reduced; the method can count overload loss caused by gravity unloading of a soil body, soil around pile of the lower section pile is unloaded, and the end resistance of pile end soil of the lower section pile is reduced as well. Furthermore, with regard to pile bodies which cannot be detected by a conventional acquiring method of Q of the vertical compressive pile, for example, piles in water and piles on sloping fields, correct Q can be acquired by virtue of the method disclosed by the invention.

Description

technical field [0001] The invention relates to the technical field of civil engineering pile foundation detection, in particular to a method for converting the load of an O-cell test pile into the load of a vertical compression pile. Background technique [0002] The method for obtaining the Q of the existing vertical compression pile is: apply a vertical downward load on the pile top of a continuous pile, measure the settlement Si of each level corresponding to each level of load Qi, and then according to the difference between Qi and Si data A graph of the relationship between them is drawn. According to the Q-S curve of the vertical compression pile, the various load-deformation stages of the vertical compression of the single pile can be judged. This method is currently the most reliable method for obtaining the vertical compression bearing capacity of the single pile, referred to as the traditional static load experiment method. According to Section 4.4.2 of "Technic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D33/00
CPCE02D33/00
Inventor 马宇飞马海龙虞月桥陈镇应志杰
Owner HANGZHOU SOUTHWEST DETECTION TECH CO LTD
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