A piezometric extension tube for a large-scale penetration test and method of operation thereof

An extension tube and pressure measurement technology, applied in permeability/surface area analysis, pipes, hoses, etc., can solve problems such as reducing the accuracy of measurement data, improve the test success rate, and solve the contact surface gap and side wall flow around The effect of interference and improving test accuracy

Active Publication Date: 2022-04-01
POWERCHINA XIBEI ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a pressure measurement extension tube for large-scale penetration tests and its operation method to overcome the problem in the prior art that the measurement data is interfered by the gap of the contact surface and the flow around the side wall, which reduces the accuracy of the measurement data.

Method used

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  • A piezometric extension tube for a large-scale penetration test and method of operation thereof
  • A piezometric extension tube for a large-scale penetration test and method of operation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Such as figure 1 As shown, a pressure measurement extension tube for large-scale penetration tests, including an outer filter 1, a filler material 2, an inner filter 3, a rigid extension tube 5, a flexible extension tube 6, a control valve, a pressure sensor, and a permeameter The inner wall of the box wall 10 is connected with the flexible extension pipe 6, the rigid extension pipe 5 and the inner filter screen 3 successively from left to right, the right end of the rigid extension pipe 5 is connected with the outer filter screen 1 and the outer filter screen 1 is positioned at the right outer side of the inner filter screen 3, The filling material 2 is filled between the inner filter 3 and the outer filter 1, the control valve is respectively connected to the flexible extension pipe 6 and the pressure sensor and the control valve is located on the outer wall of the permeameter box wall 10, and the pressure sensor is connected to the flexible extension pipe 6.

[0025]...

Embodiment 2

[0027] On the basis of Embodiment 1, the shape of the outer filter 1 is spherical, and the shape of the inner filter 3 is hemispherical. The outer filter 1 and the inner filter 3 of this shape reduce the contact area between impurities and the filter (outer filter and inner filter) when filtering the sample, so as to prevent impurities from depositing on the filter, blocking the filter, and affecting the filtration. Effect.

[0028] Further, the outer filter is a spherical structure with a diameter of 2.0-4.0cm, and the inner filter is a hemispherical structure with a diameter of 1.0-2.0cm; preferably the outer filter is a spherical structure with a diameter of 3.0cm, and the inner filter is a diameter of 2.0cm The hemispherical shape of the filter; this size screen filters better than other screen sizes.

[0029] Further, the filler 2 is fine gravel. The fine gravel is conducive to the collection and seepage of water when the seepage sample is passed, reducing the interfere...

Embodiment 3

[0032] On the basis of Example 2, the rigid extension pipe 5 adopts a hollow 304 steel circular pipe. Its tensile strength is better than ordinary stainless steel materials, even reaching the effect of 520MPa. Because of its high strength, when the extension tube is buried in the sample, it can ensure that the extension tube is not deformed and safe when faced with vibration shock in the later stage. High, because its own density is 7.93, so it can adapt to the external environment well when used, and it is not easy to rust.

[0033] Such as figure 2 As shown, further, the outer wall of the rigid extension pipe 5 is sleeved with an annular steel sheet 4 . The annular steel sheet 4 can effectively block the pore passage between the outer wall of the rigid extension tube 5 and the sample.

[0034] Further, the rigid extension tube 5 adopts a hollow 304 steel circular tube with a diameter of 2.0 cm and a wall thickness of 0.5 cm; the outer diameter of the annular steel sheet 4...

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Abstract

The invention belongs to the technical field of test and detection, and specifically provides a pressure measurement extension tube for large-scale penetration tests and an operation method thereof, including an outer filter screen, a filling material, an inner filter screen, a rigid extension tube, a flexible extension tube, and a control valve , pressure sensor, the inner wall of the permeameter box wall is connected to the flexible extension pipe, the rigid extension pipe and the inner filter in turn from left to right, the right end of the rigid extension pipe is connected to the outer filter and the outer filter is located on the right outside of the inner filter, and the inner Filling material is filled between the filter net and the outer filter net, the control valve is respectively connected to the flexible extension tube and the pressure sensor and the control valve is located on the outer wall of the permeameter box wall, and the pressure sensor is connected to the flexible extension tube. The present invention effectively measures the penetration test The water pressure inside the sample during the process can effectively reduce the interference of the water pressure caused by the flow around the side wall of the permeameter in the traditional measurement, solve the problem that the measurement data in the prior art is interfered by the gap of the contact surface and the flow around the side wall, and improve the measurement Data Accuracy.

Description

technical field [0001] The invention belongs to the technical field of test and detection, and in particular relates to a pressure measuring extension tube used for a large-scale penetration test and an operation method thereof. Background technique [0002] Large-scale penetration tests are one of the most direct and reliable methods for determining soil permeability. In the penetration test, it is particularly important to accurately measure the water pressure values ​​of different sample sections. If there are too many interference factors in the measured position, the data collected by the test will be easily affected and cause deviations. The traditional measurement method only measures the water pressure value of the contact surface between the side wall of the permeameter and the sample. Usually, due to the different properties of the two materials at the interface, gaps are easily formed on the contact surface, and there are interference factors such as flow around t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08F16L27/10F16L41/14F16L9/02F16L11/08F16L55/07
CPCG01N15/0806G01N15/0826F16L27/1008F16L41/14F16L9/02F16L11/081F16L55/07
Inventor 周恒崔家全马凌云陆希苗喆王建民鲁瑞许建军张路
Owner POWERCHINA XIBEI ENG
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