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Method for testing vertical permeability characteristic of sand gravel damming material of earth-rock dam

A technology of permeability characteristics and test methods, which is applied in the field of geotechnical tests of water conservancy and hydropower projects, can solve the problems of lack of test methods and equipment, and the inability to measure the permeability characteristics of filling materials, etc., and achieve significant economic benefits

Pending Publication Date: 2021-06-29
POWERCHINA XIBEI ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the tests on the permeability characteristics of the original graded sand and gravel dam materials are carried out after the on-site rolling test, and only the test pit water injection method is used to measure the permeability coefficient in the unsaturated state. Permeability and evolution process of sand and gravel dam material samples
In addition, since the permeability test is carried out on the existing rolling body, it is impossible to measure the permeability characteristics of the filling material under the pressure of the overlying dam body
[0003] Due to the limitations of equipment processing conditions and project scale, in the current domestic version of the test procedures, for sand and gravel fillers with a maximum particle size far exceeding 60mm, the scaled-scale filler gradation is often used indoors for testing. , there is a lack of clear test methods and equipment for the vertical permeability test of the original graded filler with a particle size greater than 60mm

Method used

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  • Method for testing vertical permeability characteristic of sand gravel damming material of earth-rock dam
  • Method for testing vertical permeability characteristic of sand gravel damming material of earth-rock dam
  • Method for testing vertical permeability characteristic of sand gravel damming material of earth-rock dam

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specific Embodiment approach

[0063] It should be noted that the structures, proportions, sizes, etc. shown in this specification are only used to cooperate with the content disclosed in the specification for the understanding and reading of those familiar with this technology, and are not used to limit the conditions for the implementation of the present invention , any modification of structure, change of proportional relationship or adjustment of size shall still fall within the scope covered by the technical content disclosed in the present invention without affecting the effect and purpose of the present invention. .

[0064] At the same time, terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit this specification. The practicable scope of the invention and the change or adjustment of its relative relationship shall also be regarded as the practicable scope of the present invention without...

Embodiment 1

[0066] Such as figure 1 As shown, the invention discloses a method for testing the vertical permeability characteristics of sand and gravel dam materials for earth-rock dams, comprising the following steps:

[0067] Step 1: Determine the size of the permeameter 3, the loading of the permeameter 3, and the maximum head pressure of the water head water supply pressurizing device 2 according to the test requirements;

[0068] Step 2: Perform side wall flow treatment on the inner wall of the permeameter 3;

[0069] Step 3: Prepare samples for the filling material according to the requirements of the penetration test, and pre-embed the pressure measurement extension pipe 29 in the pressure measurement hole 28 of the permeameter 3 during sample preparation;

[0070] Step 4: After sample preparation is completed, install the upstream permeable plate 24 of the permeameter 3, lay buffer material on the upstream permeable plate 24, and then install the hydraulic jack 26 to fasten the p...

Embodiment 2

[0075] preferred, such as figure 2 , 3 As shown, in the step 1, the permeameter 3 includes a sand discharge hole 19, a water inlet 20, a downstream permeable plate 21, a support column 22, a sample container 23, an upstream permeable plate 24, an upper cover water outlet 25, a hydraulic jack 26, Force transmission column with holes 27, pressure measuring hole 28, pressure measuring extension tube 29, saturation hole 30, support base 31, sample container upper cover 32 and sample container lower cover 33, the sample container lower cover 33 is installed on the support base 31 upper end surface, wherein the lower end surface of the sample container lower cover 33 is provided with a sand discharge hole 19, the left and right end surfaces of the sample container lower cover 33 are respectively provided with a water inlet 20 and a saturation hole 30, and the inside of the sample container lower cover 33 is vertically provided with The support column 22, the lower end of the sampl...

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Abstract

The invention belongs to the technical field of water conservancy and hydropower engineering geotechnical test methods, and discloses a method for testing vertical permeability characteristic of sand gravel damming material of an earth-rock dam. The method utilizes a permeameter to carry out a large-scale vertical permeability characteristic test on an original grading damming material, and can avoid the influence of a grain grading scale effect on the permeability characteristic of the damming material. A water head water supply pressurizing device is used for simulating an actual dam body water retaining working water head, on the basis of maintaining the original filling material gradation, the permeability characteristic of the hydropower station dam filling material under the action of the actual water head pressure is simulated, and a high-precision control assembly is matched, so that the original gradation permeability characteristic test of the filling material under different conditions can be realized. The permeability characteristic parameters of the sand gravel filling material of the earth-rock dam are measured, the evolution process of the permeability characteristic of the filling material is recorded and analyzed, more accurate, reliable and real technical parameters are provided for analysis and evaluation of the permeability stability of the dam body of a high-face-rock dam, and the economic benefits are remarkable.

Description

technical field [0001] The invention belongs to the technical field of geotechnical test methods for water conservancy and hydropower projects, and in particular relates to a test method for vertical permeability characteristics of sand and gravel dam materials for earth-rock dams. Background technique [0002] With the construction of high concrete dams, the permeability characteristics of sand and gravel dam materials and the seepage stability of dam bodies have become the key technical issues restricting the construction of high concrete dams. Most of the tests on the permeability characteristics of the original graded sand and gravel dam materials are carried out after the on-site rolling test, and only the test pit water injection method is used to measure the permeability coefficient in the unsaturated state. The permeability characteristics and evolution process of sand and gravel dam material samples. In addition, since the permeability test is carried out on the ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
CPCG01N15/0826
Inventor 崔家全王建民杨凌云王奇峰魏鹏马凌云李子森陆希李粉灵张晓凤
Owner POWERCHINA XIBEI ENG
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