A Field Measuring Device for Total Soil Suction Based on Filter Paper Method

A technology of on-site measurement and filter paper method, applied in the field of geotechnical engineering, to achieve the effect of simple operation process

Active Publication Date: 2017-08-01
CHINA THREE GORGES UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is relatively simple and convenient to operate. However, the disadvantage is that the soil sample after disturbance and reconstruction is used in the indoor test, and the structure and compaction of the soil sample are different from the original soil in the field. The characteristic curve does not necessarily reflect the real soil-water characteristics of the soil on site

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  • A Field Measuring Device for Total Soil Suction Based on Filter Paper Method
  • A Field Measuring Device for Total Soil Suction Based on Filter Paper Method
  • A Field Measuring Device for Total Soil Suction Based on Filter Paper Method

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Embodiment Construction

[0025] like Figure 1~Figure 5 As shown, a field measuring device for total soil suction based on the filter paper method includes a measuring tube 1, which is generally tubular in shape, and the measuring tube 1 is a PVC pipe with an outer diameter of 50 mm, an inner diameter of 47 mm, and a length of 320 mm. The upper and lower ports of this pipe all use diameter 50mm, the sealing sheet 2 of thickness 3mm, and sealing sheet 2 is rubber sheet, and sealing sheet 2 seals PVC main pipe body, prevents the moisture in the soil from evaporating and losing through the pipe body channel.

[0026] The function of the measuring tube 1 is mainly to maintain the depth of the device into the soil and serve as a carrier for placing the filter paper 5 and its protective cylinder 4 . The measuring tube 1 is designed with a plurality of protective tubes 4. In this embodiment, two protective tubes 4 are preferably used, respectively at 90mm and 190mm from the lower port of the measuring tube 1...

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Abstract

The invention provides a field soil total suction measurement device based on a filter paper method. The field soil total suction measurement device comprises a measuring tube; sealing pieces are arranged at the upper and lower openings of the measuring tube; a plurality of pairs of through holes are formed in the measuring tube; a protective cylinder is inserted into each through hole, and the two ends of the protective cylinder are exposed from the wall of the measuring tube; filter paper is placed in the protective cylinder. The field soil total suction measurement device based on the filter paper method is capable of measuring the soil total suction values at different depths by arranging filter paper holding modules on the body of the measuring tube at different heights.

Description

technical field [0001] The invention relates to an on-site measuring device for soil total suction force based on a filter paper method, and relates to the technical field of geotechnical engineering. Background technique [0002] The filter paper method is a common method for measuring the soil-water characteristic curve of unsaturated soil, which has the advantages of low cost and large suction measurement range. Its working principle is: based on the theoretical basis that filter paper can achieve equilibrium with soil with certain suction through water vapor migration. There are two kinds of soil suction usually measured in actual research, one is the total suction, which is composed of two parts: matrix suction and osmotic suction; the other is matrix suction, and its magnitude depends on the capillary action of the soil, soil structure and surface tension factors. Both kinds of suction can be tested by the filter paper method. The general process of using the filter ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N5/00
Inventor 张华张沣袁密申科曹金露李茂
Owner CHINA THREE GORGES UNIV
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