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Permeation method for realizing multi-field coupling and in-situ dry-wet cycle

A dry-wet cycle, in-situ technology, applied to the field of rock and soil infiltration, can solve the problems of inability to achieve multi-field coupling, inability to simulate periodic cycles of rock and soil, affecting the accuracy of sample penetration, saving time, The effect of improving the convenience of operation and ensuring the sameness

Active Publication Date: 2019-03-12
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The permeability test device disclosed in this patent document can compare the permeability coefficient before and after the dry-wet cycle of the sample, and obtain the influence of the number, frequency and time of the dry-wet cycle on the sample permeability coefficient, but it cannot realize multi-field coupling. It cannot effectively reflect the actual situation, affects the accuracy of sample penetration, and cannot accurately simulate the periodic cycle of rock and soil affected by the rise and fall of the reservoir water level

Method used

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  • Permeation method for realizing multi-field coupling and in-situ dry-wet cycle

Examples

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Effect test

Embodiment 1

[0044] An infiltration method for realizing multi-field coupling and in-situ dry-wet cycle, comprising the following steps:

[0045] a, prepare the sample, the prepared sample is contained on the station groove 35 of the pressure chamber 10 of the permeameter;

[0046] b. Apply confining pressure and axial pressure at the same time. During the application process, the confining pressure must be greater than the axial pressure, and the pressure value should be kept stable when the designed pressure load is reached;

[0047] c. Apply a cycle of water pressure to the pressure chamber 10 of the permeameter. The cycle time is 1.5 days. First, pressurize to 0.15MPa uniformly for 12 hours to simulate the rise of the reservoir water level; keep the 0.15MPa pressure constant for another 12 hours to simulate High water level stable period; the pressure evenly drops to 0 in the last 12 hours, simulating the low water level stable period; when water pressure is applied, the pressure chamb...

Embodiment 2

[0052] An infiltration method for realizing multi-field coupling and in-situ dry-wet cycle, comprising the following steps:

[0053] a, prepare the sample, the prepared sample is contained on the station groove 35 of the pressure chamber 10 of the permeameter;

[0054] b. Apply confining pressure and axial pressure at the same time. During the application process, the confining pressure must be greater than the axial pressure, and the pressure value should be kept stable when the designed pressure load is reached;

[0055]c. Apply a cycle of water pressure to the pressure chamber 10 of the permeameter. The cycle time is 1.5 days. First, pressurize to 0.15MPa uniformly for 12 hours to simulate the rise of the reservoir water level; keep the 0.15MPa pressure constant for another 12 hours to simulate High water level stable period; the pressure evenly drops to 0 in the last 12 hours, simulating the low water level stable period; when water pressure is applied, the pressure chambe...

Embodiment 3

[0062] An infiltration method for realizing multi-field coupling and in-situ dry-wet cycle, comprising the following steps:

[0063] a, prepare the sample, the prepared sample is contained on the station groove 35 of the pressure chamber 10 of the permeameter;

[0064] b. Apply confining pressure and axial pressure at the same time. During the application process, the confining pressure must be greater than the axial pressure, and the pressure value should be kept stable when the designed pressure load is reached;

[0065] c. Apply a cycle of water pressure to the pressure chamber 10 of the permeameter. The cycle time is 1.5 days. First, pressurize to 0.15MPa uniformly for 12 hours to simulate the rise of the reservoir water level; keep the 0.15MPa pressure constant for another 12 hours to simulate High water level stable period; the pressure evenly drops to 0 in the last 12 hours, simulating the low water level stable period; when water pressure is applied, the pressure chamb...

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Abstract

The invention discloses a permeation method for realizing multi-field coupling and in-situ dry-wet cycle, belonging to the technical field of rock and soil permeation. The method is characterized by comprising the following steps: a. preparing a sample, and placing the prepared sample on a working tank of a pressure chamber of a permeameter; b. simultaneously applying a confining pressure and an axial pressure, wherein the requirement that the confining pressure is greater than the axial pressure is met during the application, and maintaining the pressure values to be stable when the designedpressure load is reached; c. applying a water pressure to the interior of the pressure chamber of the permeameter for one cycle; d. draining and drying; e. repeating the steps c and d, cycling for 1-6times, and ending the test. The permeation method provided by the invention can realize multi-field coupling and is more in line with the actual situation; furthermore, the method can realize in-situdrying and measurement of dryness and humidity of the sample, and guarantees the integrity of the sample structure during the test, thereby being capable of effectively reflecting the actual reactionsituation and guaranteeing the accuracy of the sample permeation; the method can perform accurate cyclic simulation periodically on rock and earth mass affected by the rise and fall of the water level of a reservoir.

Description

technical field [0001] The invention relates to the technical field of rock-soil mass infiltration, in particular to an infiltration method for realizing multi-field coupling and in-situ dry-wet cycle. Background technique [0002] During the construction and operation of large-scale hydropower projects, reservoir storage and reservoir water level fluctuations will cause changes in the hydrological conditions and natural environment of the slopes on both banks. The periodic rise and fall of the reservoir water level will not only cause cyclical changes in the dry and wet state of rock and soil, but also cause periodic changes in the seepage field and stress field of the slopes on both banks. [0003] In the past, when testing the permeability of rock and soil, the existing methods only considered the dry-wet cycle caused by the rise and fall of the reservoir water level, and did not consider the joint action of the seepage field and the stress field. That is, the effects of...

Claims

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Application Information

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IPC IPC(8): G01N15/08
CPCG01N15/0806G01N15/0826
Inventor 汤明高杨何许强祝权龚正峰
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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