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Pore water pressure gauge and use method thereof

A technology of pore water pressure and water pressure, which is used in the measurement of fluid pressure, measuring devices, instruments, etc., can solve the problems of difficult to meet the measurement accuracy requirements, instrument damage, large range, etc. low cost effect

Inactive Publication Date: 2011-11-02
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. The measurement range is too large, and the sensitivity is difficult to meet the measurement accuracy requirements of cm or mm level water head changes in model tests;
[0005] 2. The price is expensive, and the model test investment is limited, which makes it difficult to purchase a large number of pore water pressure gauges for multi-point measurement;
[0006] 3. Both the vibrating wire type and the piezoresistive type have the characteristics that it is easy to short-circuit the circuit and damage the instrument due to water ingress at the test end, and it is not easy to carry out long-term monitoring and repeated use

Method used

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  • Pore water pressure gauge and use method thereof
  • Pore water pressure gauge and use method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] In the clay foundation pit outburst model test, the model pool has an inner pool and an outer pool, and the inner and outer model pools are both rectangular. The length, width, and height of the outer pool are 2.3m×1.6m×1.0m, and the wall thickness of the outer pool is 260cm. The inner wall and the bottom of the pool are treated with anti-seepage treatment to avoid water seepage and pressure relief. A small sand pool is built inside the outer pool, the distance between the outer wall of the small sand pool and the inner wall of the large model pool is 30cm, the wall thickness of the small sand pool is 140cm, and the inner wall of the small sand pool is also waterproofed. Four steel pipes are pre-embedded in the four corners of the wall of the large model pool, and the bottom of the steel pipes is horizontally laid into the bottom of the small sand tank through joints. The four steel pipes are used for water injection and pressurization.

[0041] A 42-45cm thick sand is ...

Embodiment 2

[0048] Rockfill face dam hydraulic model test, the model pool is rectangular, the length, width and height are 2.3m×1.6m×1.0m, the wall thickness of the pool is 260cm, and the inner wall and the bottom of the pool are treated to prevent seepage and pressure relief. A trapezoidal dam body with a height of 0.8m and an upper and lower bottom of 0.2m and 0.5m is built in the model pool. Both ends of the dam body are connected to the model pool. A permeable stone pore water pressure test point is arranged every 0.1m from top to bottom in the sand and gravel in the dam body, and the water pressure transmission pipeline is laid horizontally and passes through the model pool to connect to the water pressure display board.

[0049] The diameter of the permeable stone at the pore water pressure test end is 30mm, and the thickness is 10mm; the inner diameter of the thin copper tube for the water pressure transmission pipeline is 5mm, and the outer diameter is 8mm. After laying out the pe...

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Abstract

The invention discloses a pore water pressure gauge comprising a water pressure display unit. The water pressure display unit comprises a vertical plate, a glass tube and a rubber tube, wherein squared paper is arranged in the front of the vertical plate; the glass tube is vertically fixed on the vertical plate; the rubber tube is connected with the lower end of the glass tube; and the other end of the rubber tube is connected with a water pressure-conveying pipeline the other end of which is closed and connected with a pore water pressure tester made of permeable stone. The invention also discloses a use method of the pore water pressure gauge. The pore water pressure gauge combines the favorable permeability of the permeable stone and the flexibility of the water pressure-conveying pipeline, displays water pressure by the transparent glass tube, achieves favorable pore water pressure measuring effect of a model test, not only can be used for clay tests, but also can be used for gravel tests.

Description

technical field [0001] The invention relates to the field of geotechnical and hydraulic model tests, in particular to a pore water pressure gauge and a using method thereof. Background technique [0002] It is often necessary to monitor pore water piezometers in geotechnical and hydraulic model tests. At present, the commonly used pore water piezometers are divided into vibrating wire type and piezoresistive type. These two types of pore water piezometers are mainly used for on-site monitoring of civil and hydraulic engineering. 0.005MPa~20.000MPa (equivalent to 0.5m~200m water head). [0003] There are the following disadvantages in using the above two types of pore water piezometers for geotechnical and hydraulic model tests: [0004] 1. The measurement range is too large, and the sensitivity is difficult to meet the measurement accuracy requirements of cm or mm level water head changes in model tests; [0005] 2. The price is expensive, and the model test investment is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L19/08
Inventor 郑刚杨建民
Owner TIANJIN UNIV
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