A field test method for testing the neutral point of negative friction resistance of phc pipe piles in soft soil areas

A technology of PHC pipe pile and negative friction resistance, which is applied in the field test of testing the neutral point of negative friction resistance of PHC pipe piles in soft soil areas, and the field of testing to determine the neutral point of negative friction resistance of piles, which can solve the negative friction of PHC pipe piles. Resistance neutral point distortion and other problems, to achieve the effect of clear principle, clear and accurate principle, and high accuracy

Active Publication Date: 2022-05-03
INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the weak point of prior art, is to provide a kind of field test method that provides a kind of testing soft soil area PHC pipe pile negative friction resistance neutral point, method is easy to operate, easy to operate, can Effectively solves the current problem of distortion of the neutral point of negative friction resistance of PHC pipe piles obtained by indoor tests or theoretical calculations

Method used

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  • A field test method for testing the neutral point of negative friction resistance of phc pipe piles in soft soil areas
  • A field test method for testing the neutral point of negative friction resistance of phc pipe piles in soft soil areas
  • A field test method for testing the neutral point of negative friction resistance of phc pipe piles in soft soil areas

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Embodiment 1

[0055] The test site of Example 1 is an under-consolidated soft soil stratum, and the soil layers are respectively from top to bottom, the first layer is soft soil, and the thickness of the layer is about 10m; the second layer of soil is clay, and the thickness of the layer is about 4m; The third layer of soil is silty clay with a layer thickness of about 6m. The pile diameter of the PHC pipe pile is about 0.5m, the pile spacing is about 3.0m, and the square layout is arranged. The pile top is set with a pile head of about 1.5m×1.5m×0.35m. The pile head is cast-in-situ C30 concrete. About 20m. The heap soil used in the test is compacted cohesive soil, and the heap height of the compacted soil is about 5m. According to the classification, there are 10 levels in total, and each level is about 0.5m.

[0056] Such as figure 1 As shown, a field test method for testing the neutral point of negative friction resistance of PHC pipe piles in soft soil areas, the steps are:

[0057] ...

Embodiment 2

[0079] In order to better test the general applicability of a kind of field test method of testing the negative friction resistance neutral point of PHC pipe piles in soft soil area of ​​the present invention, select the soft soil stratum different from embodiment 1, the test site of embodiment 2 It is lacustrine soft soil stratum, and the soil layers are from top to bottom. The first layer is muddy soft soil with a thickness of about 12m; the second layer is silt with a thickness of about 9m; the third layer is Clay, layer thickness is about 4m. In addition, choose the PHC pipe pile diameter, pile spacing and pile length different from that of Example 1. The pile diameter of the PHC pipe pile in Example 2 is about 0.6m, the pile spacing is about 4.0m, and the basic pile length is about 25m. Arranged in a triangle, the top of the pile is set with a pile head of about 1.5m×1.5m×0.35m, and the pile head is cast-in-situ with C30 concrete. The heap soil used in the test is compac...

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Abstract

The invention discloses a field test method for testing the neutral point of negative friction resistance of PHC pipe piles in soft soil areas. The steps are as follows: 1) stratum layering: using a drilling rig to drill holes in the manner of spiral drilling to obtain the stratum of the soil around the pile Layer information; 2) Embedding of layered settlement equipment: lay the inclined pipe flat on the ground, and insert it into the settlement ring sequentially from the bottom. The stratum information obtained from the number and position of the settlement ring is determined, and the settlement plate is fixed on the pile head ;4) Surcharge: carry out surcharge to the area surrounded by the pile head and the inclined pipe, the surcharge soil is cohesive soil, and roll it with a roller compactor while surfacing until the surcharge reaches a height; 5) Settlement data collection : Connect the layered settlement probe and the layered settlement data acquisition instrument respectively with the two ends of the measuring line, vertically lower the layered settlement probe into the inclined pipe, and repeatedly test the layered settlement data; 6) calculation and analysis. The method is easy to operate and easy to operate, and can effectively solve the problem of distortion of the neutral point of negative friction resistance of PHC pipe piles obtained by laboratory tests at present.

Description

technical field [0001] The invention belongs to the technical field of pile foundation engineering in geotechnical engineering, and more specifically relates to a field test method for testing the neutral point of negative friction resistance of PHC pipe piles in soft soil areas, which is suitable for testing to determine the neutral point of negative friction resistance of piles. Background technique [0002] In recent years, more and more high-rise buildings have been built. Shallow foundations cannot meet the requirements of the structure for foundation strength and deformation. Pile foundations are favored due to their good integrity, high rigidity, small settlement, and ability to withstand large horizontal and vertical loads. widely used. PHC pipe piles are prestressed high-strength concrete pipe piles. It adopts the pre-tensioned prestressed centrifugal forming process, and after 10 atmospheric pressure (about 1.0Mpa) and steam curing at about 180°C, a hollow cylindr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D33/00E02D5/58E02D27/12
CPCE02D33/00E02D5/58E02D27/12
Inventor 张先伟刘新宇常志雄刘智海余敦猛李悦刘浩彭龙帆
Owner INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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