Device and method for testing mechanical properties of pile-soil contact surface

A technology for testing device and mechanical properties, which is applied in the direction of measuring device, strength properties, and testing material strength by applying stable tension/pressure, can solve the problems of geotechnical instruments not being able to study the pile-soil contact surface test, etc., and achieve simple structure, easy-to-achieve effects

Active Publication Date: 2012-08-08
HOHAI UNIV
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Problems solved by technology

[0003] The present invention aims at the defects that the existing geotechnical instruments cannot carry out the pile-soil co

Method used

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  • Device and method for testing mechanical properties of pile-soil contact surface
  • Device and method for testing mechanical properties of pile-soil contact surface

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Embodiment Construction

[0031] Such as figure 1 , as shown, a pile-soil contact surface mechanical properties testing device, its structure includes a sealed pressure chamber (1), a hollow cylindrical soil sample (2), a solid cylindrical concrete pile sample (3), it is characterized in that the solid The cylindrical concrete pile sample (3) is prefabricated, and its diameter is equal to the inner diameter of the hollow cylindrical soil sample (2), and the two closely fit; the lower end of the concrete pile sample (3) is placed on the base ( 11), the upper end is connected to the pressure loading system through the dowel bar (8), and the stress sensor (5) and the displacement sensor I (6) are set on the dowel bar (8); the outer side of the concrete pile sample (3) is a hollow cylinder Soil sample (2), filter paper (9) and permeable stone (10) are placed on the lower end of soil sample (2) and placed on the base (12), and filter paper (9), permeable stone (10), The top cover (13) and the displacement ...

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Abstract

The invention discloses a device for testing the mechanical properties of a pile-soil contact surface. The device is composed of a sealed pressure chamber, a hollow cylindrical soil sample, a solid cylindrical concrete pile sample and the like. The pile sample is prefabricated, and its diameter is equal to the internal diameter of the hollow cylindrical soil sample, and the two samples joint together closely. The lower end of the concrete pile sample is disposed on a pedestal through a spring assembly, and the upper end is connected to a stress loading system through a dowel bar, which is provided with a stress sensor and a displacement sensor I. The outside of the concrete pile sample is the hollow cylindrical soil sample. Filter paper and permeable stones are disposed at the lower end of the soil sample, and the lower end is positioned on the pedestal, while the upper end of the soil sample is provided with filter paper, permeable stones, a top cover and a displacement sensor II in order. During test, a confining pressure is exerted first for consolidating, and then a static (dynamic) load is exerted on the pile sample for measuring the axial deformation, pore water stress and the like of the pile and the soil. The device provided in the invention has a simple structure, is easy to realize, and can be used to measure the mechanical properties of a pile-soil contact surface under the action of a static (dynamic) load.

Description

technical field [0001] The invention belongs to the technical field of civil engineering, and in particular relates to a test device and a test method for the mechanical properties of pile-soil contact surfaces. Background technique [0002] In recent years, pile foundations have been widely used in the foundation engineering of highways, bridges and civil buildings, so that there are a large number of contact surfaces between piles and soil in this type of foundation. Due to the different properties of the pile and the soil around the pile, the stiffness of the two is different. There are large differences in deformation such as settlement under the upper load; in addition, friction piles such as cast-in-place large-diameter pipe piles increase the pile-side friction by expanding the contact area between the pile and the soil. Therefore, it is of great significance to measure the settlement deformation and pile side friction resistance of the pile-soil contact surface durin...

Claims

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Application Information

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IPC IPC(8): G01N3/00G01N3/10
Inventor 刘平杨贵丁选明刘汉龙
Owner HOHAI UNIV
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