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Device for testing pore water pressure

A technology of pore water pressure and pore water pressure gauge, which is applied in the field of foundation soil survey, construction, infrastructure engineering, etc., and can solve the problem that the service life of buried pore water pressure gauge is greatly affected by the environment, cannot be realized, and is difficult to bury Pore ​​water pressure gauge and other issues to achieve the effect of enhancing monitorability, improving safety assurance, and continuous testing

Inactive Publication Date: 2017-08-11
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, sometimes it is difficult to bury the pore water pressure gauge due to site restrictions and other reasons.
For example, during shield tunneling, it is obviously impossible to bury ordinary piezometers on the tunnel face to measure pore water pressure.
Moreover, the service life of the buried pore water pressure gauge is greatly affected by the environment

Method used

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  • Device for testing pore water pressure
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  • Device for testing pore water pressure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A device for testing pore water pressure, its structure is as follows figure 1 As shown, it is mainly composed of a water storage container 1, a positioning steel plate 2, a permeable stone 3 and a pore water pressure gauge 4. The middle part of the positioning steel plate 2 is provided with an opening, and the aperture is divided into two levels. The water storage container 1 is connected to the positioning steel plate 2, and is a hollow structure with a hole in the center of the interior. The pore water pressure gauge 4 is set in the water storage container 1, and the permeable stone 3 is set in the opening of the positioning steel plate 2. The upper surface and the water storage The lower surface of the container is in contact, and a water storage space 7 is formed between the permeable stone 3 and the pore water pressure gauge 4 .

[0034] The outer surface of the lower section of the water storage container 1 is provided with threads, which are matched and connect...

Embodiment 2

[0040] Pore ​​Water Pressure Test of Slag in Screw Conveyor

[0041] The screw conveyor is an important component of the earth pressure balance shield, which plays a vital role in maintaining the earth pressure balance of the shield excavation face. It changes the amount of soil discharged by controlling the speed, thereby controlling the pressure of the soil chamber and realizing the balance between the pressure of the soil chamber and the pressure of the face. By fixing the present invention on the screw conveyor, the pore water pressure in the muck can be tested during the process of conveying the muck by the screw conveyor.

[0042] The details of the implementation are as follows:

[0043] Such as figure 2 As shown, five measuring points 9 are respectively selected on the upper and lower sides of the screw conveyor 8, and openings are reserved at these points when the screw conveyor is manufactured. Install the assembled manometer on each measuring point. When the sc...

Embodiment 3

[0047] Pore ​​water pressure test of shield machine face

[0048] For the earth pressure balance shield, the outer wall of the soil cabin is in direct contact with the soil mass of the tunnel face, and the invention can be installed on the soil bulkhead to measure the pore water pressure in the soil mass of the tunnel face.

[0049] The details of the implementation are as follows:

[0050] like image 3 As shown, the shield machine 11 is set in the soil layer 11, and a suitable location is selected as the measuring point 9 on the inner surface of the soil chamber 11 of the shield machine 10, and opening conditions are reserved at these points when the shield machine is manufactured. Install the assembled manometer on each measuring point. During the tunneling process of the shield machine, the pore water in the muck enters the water storage container from the permeable stone to realize the test of the pore water pressure. The overall size of the device and the dimensions o...

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Abstract

The invention relates to a device for testing pore water pressure. The device for testing the pore water pressure is mainly composed of a water storage container (1), a positioning steel plate (2), a permeable stone (3) and a pore water pressure meter (4), wherein a hole is formed in the middle of the positioning steel plate (2), the water storage container (1) is connected with the positioning steel plate (2) and is of a hollow structure, and a hole is formed in the center of the interior of the water storage container (1); the pore water pressure meter (4) is arranged in the water storage container (1); the permeable stone (3) is arranged in the hole of the positioning steel plate (2), and the upper surface of the permeable stone (3) is connected with the lower surface of the water storage container (1) in an abutting mode; and during testing, the pore water pressure is transmitted into the water storage container (1) through the permeable stone (3) and acts on the pore water pressure meter (4) in the water storage container (1), and thus pore water pressure testing is achieved. Compared with the prior art, the device for testing the pore water pressure has the advantages of being simple in structure, convenient and fast to mount and demount, recyclable and the like, and is suitable for testing the pore water pressure under various circumstances.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering, in particular to a device for testing pore water pressure. Background technique [0002] Pore ​​water pressure is a very important research content in the field of geotechnical engineering. The value and change of pore water pressure often have a great impact on engineering. Therefore, it is necessary to monitor and measure pore water pressure during construction. For example, in loading preloaded foundation, when it is necessary to control the loading rate and degree of consolidation; in pile foundation engineering, when it is necessary to control the pile sinking rate; in engineering dewatering, when it is necessary to control ground settlement, in-situ pore water Stress testing works. [0003] An instrument that measures pore water pressure is called a pore water piezometer. According to the test principle, the pore water pressure gauge can be divided into closed type (including elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D1/00
CPCE02D1/027
Inventor 周顺华季昌夏杰余儿忠郭佳奇
Owner TONGJI UNIV
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