Test method for measuring permeability coefficient of soil body in saturation state or unsaturation state

A technology of permeability coefficient and test method, which is applied in the field of civil engineering test

Inactive Publication Date: 2010-08-25
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of this invention is to provide a kind of test method for measuring the saturated and unsaturated permeability coefficient of soil body, which is used to solve the problem of soil permeability coefficient measurement under one-dimensional vertical pressure and confining stress state under saturated or unsaturated soil conditions question

Method used

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  • Test method for measuring permeability coefficient of soil body in saturation state or unsaturation state
  • Test method for measuring permeability coefficient of soil body in saturation state or unsaturation state

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Experimental program
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Embodiment

[0010] Embodiment: the method for measuring soil saturated and unsaturated permeability coefficient is as follows,

[0011] (1) Determination method of saturated permeability coefficient of soil:

[0012] ①The upper clay plate 6, the lower clay plate 19 and the sample 17 are pumped and saturated respectively, and then the lower clay plate 19 is installed on the lower base 20, and the cross-sectional area is a and the height is h 1 The sample 17 is installed on the lower clay plate 19, the upper clay plate 6 is installed on the sample 17, the stainless steel side limit ring 7 is stuck between the upper top cover 4 and the pressure chamber base 21 through the rubber pad 16, the stainless steel side limit ring 7 The second miniature water pressure sensor 25 is installed below the left side, and the first miniature water pressure sensor 18 is installed above the stainless steel side limit ring 7 right side;

[0013] ② Install the pressure chamber 2 on the pressure chamber base 21...

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Abstract

The invention provides a test method for measuring the permeability coefficient of a soil body in a saturation state or an unsaturation state. The test method is characterized by measuring the permeability coefficient of the soil body in the saturation state or the unsaturation state by adopting a testing device, wherein the device consists of a pressure chamber 2, an upper base 5, an upper clay plate 6, a stainless steel side limitation ring 7, a lower clay plate 19, a lower base 20, and a vertical pressure lifting shaft 13; the upper clay plate 6 and the lower clay plate 19 are subjected to air extraction to reach saturation respectively; a sample 17 is placed between the upper clay plate 6 and the lower clay plate 19; and suction balance in the sample 17 is controlled by applying a pore water pressure and a pore air pressure. Due to the adoption of the device, the permeability coefficient of the soil body in the saturation state or the unsaturation state can be precisely measured. The method has the advantages of meeting requirement of loading one-dimensional vertical stress and measuring the permeability coefficient of all kinds of soil bodies in the saturation state or the unsaturation state during civil engineering, along with convenient application and high measurement precision.

Description

technical field [0001] The invention relates to a test method for measuring the saturated and unsaturated permeability coefficient of soil, which belongs to the field of civil engineering testing. Background technique [0002] Unsaturated soil is widely distributed in our country. The natural sedimentary soil widely distributed on the surface of the earth and the soil problems encountered in engineering construction are almost all unsaturated soil problems. Saturated soil in the true sense is rarely seen in engineering practice. This makes the study of unsaturated soil mechanics very realistic and practical. Hydraulic hysteresis is an important feature of unsaturated soil, and hydraulic hysteresis is usually manifested in the hysteresis of the soil-water retention curve, which is affected by many factors, such as soil structure, temperature and especially the stress state. An important parameter used to describe the hydraulic properties of unsaturated soil is the unsaturate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08G01N7/10
Inventor 李志清
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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