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Cushion material gradation design optimization method based on pore distribution index in cold regions

A technology of pore distribution and cold regions, applied in the direction of dams, barrages, weirs, etc., can solve the problems affecting the stability of the dam body, uneven deformation and cracking of face dams, etc., to reduce the test workload, narrow the range of gradation selection, The effect of frost heave deformation is small

Inactive Publication Date: 2016-08-24
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the characteristics of permafrost in western China and climate reasons, if the water entering the cushion layer cannot be discharged in time, local frost heave may occur, resulting in uneven deformation and cracking of the face dam, which will affect the stability of the dam body

Method used

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  • Cushion material gradation design optimization method based on pore distribution index in cold regions
  • Cushion material gradation design optimization method based on pore distribution index in cold regions
  • Cushion material gradation design optimization method based on pore distribution index in cold regions

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Experimental program
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Effect test

Embodiment 1

[0052] Such as Figure 1-7 As shown, the cushion material gradation design optimization method based on the pore distribution index in the cold region is characterized in that it includes the following steps:

[0053] S01, determination of rolling density:

[0054] Such as figure 1 Shown is the position of the cushion material in the face dam, and its relative density requirements, the design code for concrete face rockfill dams require more than 0.75.

[0055] Such as figure 2 As shown, the law obtained from the frost heave test under the condition of freeze-thaw cycle is: the greater the relative density of the cushion material, the greater the frost heave deformation. In order to make the cushion material have a high relative density without causing large frost heave deformation, it is recommended that the relative density range of the cushion material be designed as 0.75-0.80.

[0056] S02, cosmid replacement method:

[0057] Such as image 3As shown, for the requir...

Embodiment 2

[0070] Such as Figure 1-7 As shown, the cushion material gradation design optimization method based on the pore distribution index in cold regions, preferably, the rolling density of the cushion material is designed to be 0.80; , the content of the fine sand group is 8.75%, and other gradations are the same as Sherard gradation; the pore distribution index of each group of gradations in the cushion material is -6.2; the face dam made according to the above parameters can be formed at one time. There is no need for repeated debugging, which reduces the number of experiments. Under the condition of not affecting the permeability, the deformation of the dam body is small during frost heaving. The internal seepage stability of the dam body is good, low compressibility, high shear strength, and the service life of the face dam is long.

Embodiment 3

[0072] Such as Figure 1-7 As shown, the cushion material gradation design optimization method based on the pore distribution index in cold regions, preferably, the rolling density of the cushion material is designed to be 0.78; , the content of the fine sand group is 4%, and other gradations are the same as Sherard gradation; the pore distribution index of each group of gradations in the cushion material is -6.25; the face dam made according to the above parameters is formed at one time. There is no need for repeated debugging, which reduces the number of experiments. Under the condition of not affecting the permeability, the deformation of the dam body is small during frost heaving. The internal seepage stability of the dam body is good, low compressibility, high shear strength, and the service life of the face dam is long.

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Abstract

The invention discloses a pore distribution index based cushion material grading design optimization method for cold regions. The method is characterized by comprising the steps of S01, rolling density determination; S02, replacing of clay particles by fine sand groups; S03, pore distribution index determination; S04, grading adjustment. By the aid of the method, the grading selection range is reduced, the experiment workload is reduced, the requirements for the compactness deserved by serving as face slab support materials and permeability that shall be possessed by draining water leaking into the cushion materials of the cushion materials are met, the cushion material frost heaving deformation in condition of freezing and thawing cycle is the smallest, and the produced frost heaving deformation cannot affect the normal use of concrete face dams under the constraint of vertical pressure of the concrete face dams.

Description

technical field [0001] The invention relates to a cushion material gradation design optimization method based on a pore distribution index in a cold region, and belongs to the fields of water conservancy engineering and highway engineering. Background technique [0002] In water conservancy projects, concrete face rockfill dams are favored by engineers in the western region because of their good adaptability, and many dams that have been built or are under construction have adopted this dam type. However, due to the characteristics of permafrost in western China and climate reasons, if the water entering the cushion layer cannot be discharged in time, local frost heave may occur, resulting in uneven deformation and cracking of the face dam, which will affect the stability of the dam body. Frost heave deformation of cushion material is related to its permeability and gradation, and the selection of reasonable gradation is crucial to control the frost heave deformation of cush...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02B7/06
Inventor 袁俊平王强林韩春雷李康波丁国权
Owner HOHAI UNIV
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