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Sealing method and device suitable for large three-way loading permeameter

A technology of sealing device and permeation instrument, which is applied in the field of experimental theory, can solve problems such as danger, discounting of test results, and spraying in the gap between the upper cover and the lower instrument body, so as to ensure sealing, ensure rationality, and meet seepage The effect of research needs

Active Publication Date: 2019-10-22
NANJING HYDRAULIC RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the push plate can slide freely, if there is no specific water-tight sealing treatment inside the large-scale three-way loading permeameter, water can flow into the cavity through the gap between the push plate and the side wall, thereby affecting the permeability test results; in addition, the soil sample is directly connected to the side wall. Due to the side wall effect, it is easy to form a piping channel at the side wall, which greatly reduces the test results and affects the reliability of the test
At the same time, when performing a high-pressure permeability test, due to the high internal water pressure of the test instrument, if the instrument is separated, water can easily flow from the connection of the instrument, such as the gap between the upper cover and the lower instrument body. spray out, causing danger

Method used

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  • Sealing method and device suitable for large three-way loading permeameter
  • Sealing method and device suitable for large three-way loading permeameter
  • Sealing method and device suitable for large three-way loading permeameter

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Effect test

Embodiment 1

[0031] Embodiment 1, a kind of high-pressure penetration test sealing method, has adopted described sealing method, comprises the steps:

[0032] Step 1: Return all push plates of the instrument to their original positions;

[0033] Step 2: Glue a circular rubber sheet around the water inlet hole of the water inlet push plate and the water outlet hole of the water outlet plate, and place a rubber sheet inside the test chamber. The rubber sheet covers the front, bottom and rear sides of the instrument ( Except for the water inlet surface, water outlet surface and top), the specific size and model of the rubber sheet is determined by the calculated peak shear strength and the thickness of the rubber sheet allowed by the instrument;

[0034] Step 3: Put in the custom-made water bladder, place the geotextile and the rubber sheet in sequence on the water inlet side of the bladder body, and place the rubber sheet on the water outlet side;

[0035]Step 4: Fill the test soil sample f...

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Abstract

A sealing method and device suitable for a large three-way loading permeameter are provided. The method comprises the steps of: repositioning all the push plates of an instrument to the initial positions; sticking annular rubber plates around the water inlet of a water inlet plate and the water outlet of a water outlet plate, placing a rubber plate in a test chamber to cover the front side, the bottom side and the back side of the instrument; placing a customized water bladder, successively placing a geotextile and an annular rubber plate on the water inlet surface side in the water bladder, and placing an annular rubber back on a water outlet surface side; injecting a material into the water bladder from the top; placing another rubber plate; disposing a whole sealing strip in a sealing groove on the top; disposing the upper cover of the instrument; applying a certain pressure to each push plate; filling the instrument with water, and carrying out a corresponding penetration test after saturation. The sealing method and device solve the lateral seepage and the boundary effect existing in a large-scale three-way loading permeameter model test, ensures that the seepage water flows from the water inlet through the whole soil body, ensures the rationality of a test path, and guarantees the tightness of the entire instrument cavity under a high water pressure condition.

Description

technical field [0001] The invention relates to a sealing system for a seepage model test under high stress, belonging to the technical field of experiment theory. It is especially suitable for the overall sealing of the large-scale true triaxial permeameter when carrying out high-stress and high-head seepage model test research, ensuring the rationality of the permeation path and reducing the side wall effect. Background technique [0002] With the shift of the center of national resources construction and development, a large number of central and western water resources are gradually put on the development and utilization agenda. A series of 200m and even 300m super-high earth-rock dams have been established for investigation or construction. The original conventional triaxial seepage meter and tank seepage meter , has been unable to meet the needs of the research on the seepage mechanism and anti-seepage measures of ultra-high earth-rockfill dams. It is necessary to deve...

Claims

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Application Information

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IPC IPC(8): G01N15/08
CPCG01N15/082G01N15/0806
Inventor 陈生水吉恩跃其他发明人请求不公开姓名
Owner NANJING HYDRAULIC RES INST
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