Three-dimensional seepage field observation test device for unsaturated soil with high temporal and spatial resolution

A spatiotemporal resolution, test device technology, applied in measurement devices, permeability/surface area analysis, suspension and porous material analysis, etc. Construct simple effects

Active Publication Date: 2021-04-13
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the actual test, if the measurement point deviates from the key point of the unsaturated soil seepage field distribution, it will lead to the failure of the entire unsaturated soil seepage prediction

Method used

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  • Three-dimensional seepage field observation test device for unsaturated soil with high temporal and spatial resolution
  • Three-dimensional seepage field observation test device for unsaturated soil with high temporal and spatial resolution
  • Three-dimensional seepage field observation test device for unsaturated soil with high temporal and spatial resolution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The test method for real-time observation of the three-dimensional seepage field of unsaturated soil using the above-mentioned test device, the specific steps are as follows:

[0045] (a) Configure transparent soil solution

[0046] Mix Krystol40 white oil (refractive index 1.451) and high-grade cosmetic grade white oil (refractive index 1.464) according to the mass ratio of 1:1, and make the refractive index of the fluid 1.459, and add it to the reservoir 6;

[0047] (b) Setting up the seepage test model system

[0048] Debug the drainage pipe, liquid outlet valve 13, liquid collector 5, electronic balance 3 and MD-20RZ(M)-N series magnetic water pump 4, and then lay a filter layer 10 on the bottom of the model box 1, and lay transparent layers above the filter layer 10 Soil solid particles 9, 6 overflow outlets are evenly arranged on a plane with a certain height from the top of the transparent model box 1, and then the liquid inlet valve 12, the water head measuring...

Embodiment 2

[0056] The difference between this embodiment and the first embodiment is that the magnetic water pump is always in working condition during the test of this embodiment, and the liquid level of the water head measuring tube remains unchanged. This type of test belongs to the unsaturated soil permeability model test with constant water head.

Embodiment 3

[0058] The difference between the present embodiment and the first embodiment is that in the test process of the present embodiment, silica powder is used to simulate the transparent clay, which can be used to study the change rule of the seepage field of the unsaturated transparent clay.

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Abstract

The invention discloses a three-dimensional seepage field observation test device for unsaturated soil with high temporal and spatial resolution, including a seepage test model system, a PIV test system and a pore pressure sensor measurement system. Compared with the prior art, the test device disclosed in the present invention The device can truly reproduce the rainfall infiltration process in the natural state of the soil through the seepage test model system, and can quickly and continuously measure the amount of fluid entering and leaving the soil and the change of the soil pore pressure through the electronic balance, CCD high-speed camera and micro pore pressure sensor At the same time, according to different saturation soils have different color grayscales, the tracking of the wetting front trajectory of the seepage field can be realized, and the three-dimensional seepage of unsaturated soil with high temporal and spatial resolution can be realized by continuous and multi-side photography of the CCD high-speed camera field observation. The model test device of the invention is easy to operate, and the related instruments are simple in structure, strong in adjustability, easy to master, and have great significance for solving geotechnical engineering problems involving unsaturated soil seepage.

Description

technical field [0001] The invention relates to a model test device applied to geotechnical engineering geotechnical tests, in particular to a test device for observing three-dimensional seepage field of unsaturated soil with high temporal and spatial resolution. Background technique [0002] It is generally believed that the soil is composed of three phases: solid phase (soil particles), liquid phase (water or other liquid) and gas phase (gas). The pores of soil particles are completely filled by the liquid phase, that is, water (or other liquid) occupies the soil pores. When the ratio is 100%, the soil is called saturated soil; otherwise, the soil pores are filled by liquid and gas phases, that is, when the saturation is less than 100% but greater than 0%, the soil is called unsaturated soil. [0003] Seepage is a kind of groundwater movement. When there is a water level difference in a building and its foundation, groundwater will flow from a place with a high water level...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08
CPCG01N15/08
Inventor 张俊然姜彤黄志全于怀昌刘远征
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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