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Stress-dependent coarse-grained soil seepage deformation characteristic tester and test method

A technology of penetration deformation and test method, which is applied in the field of deformation characteristic testing device

Pending Publication Date: 2016-08-31
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to investigate the variation law of the hydraulic gradient of seepage deformation of coarse-grained soil and the measurement of the permeability coefficient after seepage deformation under the action of different stresses.

Method used

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  • Stress-dependent coarse-grained soil seepage deformation characteristic tester and test method

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Embodiment Construction

[0013] The left structure of the plexiglass barrel without a cover (20) is a double-layer transparent permeable board (13) with adjustable pores. The sample is placed in the middle, compacted and flattened. The right side of the sample is a permeable board (14), and the rightmost end is a pebble (15 ).

[0014] The left end and the right end of the coverless plexiglass barrel (20) are respectively connected with stainless steel barrel covers (5) and (6) with high-strength bolts, and the upper end is connected with the pressure chamber (10). A pressure gauge (11) is arranged on the pressure chamber (10), the upper end is connected with the blower (9), and the lower end is connected with the elastic rubber membrane (12).

[0015] The left end of the stainless steel barrel cover (5) is connected to the tee (7), the right side of the tee (7) is connected to the water outlet, the upper side is connected to the air extraction device (22), and the left side is connected to the plexig...

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Abstract

The invention discloses a stress-dependent coarse-grained soil seepage deformation characteristic tester and a test method, and belongs to the field of rock-soil body seepage deformation parameter test. The stress-dependent coarse-grained soil seepage deformation characteristic tester aims to solve the technical problem that the change rule of a coarse-grained soil seepage deformation hydraulic slope and the measurement of a seepage coefficient after seepage deformation is carried out under the function of different stresses are investigated, wherein applied pressure is controlled through the air pressure of a pressure chamber, and the quick saturation of the coarse-grained soil can be achieved by an air extractor through the injection of air-free water. In a test process, the hydraulic slopes under different stress functions are obtained through a specific value of the reading difference of two piezometer tubes and the distance, and the change rule of the hydraulic slope along with stress change is analyzed. Flow changes in a testing process are recorded to obtain the seepage coefficient after the seepage deformation is carried out. The device has the advantages of simple and reasonable structure and convenience in operation and is mainly used for fields including civil engineering, water conservancy engineering and the like.

Description

technical field [0001] The invention relates to a deformation characteristic testing device of a rock and soil mass used in civil engineering and water conservancy engineering, especially for testing the seepage deformation characteristic of coarse-grained soil under different stresses. Background technique [0002] Under the action of seepage, soil will undergo seepage deformation, which may lead to engineering failure. Therefore, it is of great significance to study the permeability of soil and its anti-seepage damage performance. In the division of grain groups, 0.075mm is used as the boundary between the coarse-grained group and the fine-grained group, and 60mm is used as the boundary between the coarse-grained group and the macro-grained group. It is stipulated that the mass of the coarse-grained group in the soil sample is more than 50% of the total mass. Soil is called coarse-grained soil. The permeability coefficient and hydraulic gradient are important indexes to c...

Claims

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Application Information

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IPC IPC(8): G01N15/08
CPCG01N15/0826
Inventor 何忠明职孟林邢逸航邓喜刘森峙蔡军
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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