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Suction accurately controlled pressure plate instrument capable of directly saturating soil sample

A precise control and soil sampling technology, applied in soil material testing, material inspection products, etc., can solve the problems of easily neglected water evaporation errors, difficult to determine suction balance conditions, affecting test results, etc. The judgment and measurement method are convenient, and the effect of improving the test accuracy

Inactive Publication Date: 2012-09-19
CHANGAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] (1) The initial saturation condition of the soil sample is not easy to realize
Due to the gap between the sample preparation device and the clay plate of the traditional pressure plate instrument, the water in the saturated soil sample will flow out before the test starts, resulting in that after the test, the measured data cannot be used to accurately calculate the pressure under low suction conditions. Moisture content of soil sample
[0004] (2) Low suction conditions are not easy to control
The traditional control of soil suction is only divided into high and low levels. Due to the large range of the low pressure section, it is limited by the accuracy of the pressure gauge and it is difficult to accurately reflect the actual suction value. The measurement of the soil water characteristic curve in the low suction range It has a great impact, especially for the soil-water characteristic curve of cracked soil, which is difficult to accurately measure
[0005] (3) Lack of automation of data collection
The test data needs to be read regularly by the test personnel, which is easy to cause human error, affects the accuracy of the data, and cannot monitor the test process in real time
[0006] (4) The suction balance condition is not easy to determine
Because the low suction condition is not easy to control, and lack of real-time monitoring of soil moisture and suction changes during the test, the soil sample is affected by the unstable suction control during the test, making it difficult to judge the suction balance condition
[0007] (5) The temperature control effect of the pressure vessel is not good
The temperature of the pressure vessel is easy to change with the environment, causing water vapor to condense on the inner wall of the pressure vessel, which makes the determination of the water content of the soil sample have certain errors
[0008] (6) The air saturation in the pressure vessel is not easy to control
The unsaturated air around the soil sample will gradually evaporate the water in the soil sample, which affects the test results
[0009] (7) The error of water evaporation is easy to be ignored

Method used

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  • Suction accurately controlled pressure plate instrument capable of directly saturating soil sample
  • Suction accurately controlled pressure plate instrument capable of directly saturating soil sample
  • Suction accurately controlled pressure plate instrument capable of directly saturating soil sample

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Embodiment Construction

[0068] Such as figure 1 and figure 2 As shown, the present invention includes a pressure chamber system 1, a suction control system 2, a soil sample suction saturation system 3, a flushing system 4, a water quality measurement system 5 and an automatic data acquisition system 6; the pressure chamber system 1 includes a base and a setting The top cover above the base, and the clay plate 19, the sample preparation device 21 and the temperature control and moisture retention device installed on the base; the top cover includes a consolidation top cover and a common top cover 28, and the base It consists of an upper base 15 and a lower base 16 which are connected. The sample preparation device 21 is installed on the upper base 15. The lower base 16 has a scour groove 17, and the clay plate 19 is set in the scour groove. On the groove 17, the scouring system 4 is connected with the scouring groove 17 and is used for scouring the air diffused from the clay plate 19, the scouring s...

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Abstract

The invention discloses a suction accurately controlled pressure plate instrument capable of directly saturating a soil sample. The instrument mainly comprises a pressure chamber system, a suction control system, a soil sample air exhaust saturation system, a scouring system, a water quality measuring system, an automatic data acquisition system and the like, and is characterized in that a sample preparation device is tightly contacted with a clay plate through threads, so that the sealing performance of the sample preparation device and the clay plate is ensured; the changes of suction and the water content of the soil sample are monitored and controlled in real time by combining a high-accuracy electronic pressure gauge with an electronic balance; a water storage outer chamber with an upper opening is formed, and a temperature control heating rod ensures that the temperature of an inner chamber is basically constant; water is stored in the inner chamber, and filter paper is soaked in the water, so that the air humidity of the inner chamber is basically saturated; and the inner chamber is improved and matched with a vacuum pump and a water storage tank, so that a new function of performing air exhaust saturation on the soil sample is realized. A measuring result of a soil-water characteristic curve is accurate, particularly test accuracy under the condition of low suction is improved, and a measuring method is convenient.

Description

technical field [0001] The invention relates to a device for measuring soil-water characteristic curves of soil samples, in particular to a pressure plate instrument with precise suction control which can directly saturate soil samples. Background technique [0002] The soil-water characteristic curve refers to the relationship curve between soil suction and soil water content, saturation or volumetric water content. The soil-water characteristic curve is an important part of the constitutive model of unsaturated soil, which can be used to estimate the strength and permeability coefficient of unsaturated soil, so it is a key parameter and basic test content in unsaturated soil mechanics. At present, the soil-water characteristic curve of soil at home and abroad is generally measured by pressure plate meter or osmotic consolidation pressure plate meter, etc. These pressure plate meters have the following problems in the process of use: [0003] (1) The initial saturation con...

Claims

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Application Information

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IPC IPC(8): G01N33/24
Inventor 林鸿州庞维福彭建兵
Owner CHANGAN UNIV
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