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Freeze-thawing and weathering environment simulation system for compacted soil and test method of freeze-thawing and weathering environment simulation system

A technology of environmental simulation and soil compaction, which is applied in the field of engineering permafrost and can solve problems such as not considering the impact of permafrost

Inactive Publication Date: 2018-10-02
CHONGQING JIAOTONG UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Does not take into account the effects of on-site weathering and solar radiation on permafrost, and monitor changes therein

Method used

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  • Freeze-thawing and weathering environment simulation system for compacted soil and test method of freeze-thawing and weathering environment simulation system
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  • Freeze-thawing and weathering environment simulation system for compacted soil and test method of freeze-thawing and weathering environment simulation system

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Embodiment 1

[0035] see figure 1 , the present embodiment discloses a compacted soil freeze-thaw and weathering environment simulation system, including a freeze-thaw model box 9 placed on the experimental platform, and an LED fluorescent lamp 4 arranged outside the freeze-thaw model box 9, a liquid nitrogen freezing cycle Equipment 8, nitrogen heating cycle equipment 10 and air-making equipment 13.

[0036] The freeze-thaw model box 9 is a transparent rectangular box with an open upper end as a whole. The outer wall of the freeze-thaw model box 9 is coated with a transparent heat insulating material 7 . Several sensor lead-in openings 14 are arranged on the inner wall of the freeze-thaw model box 9 . The sensor lead port 14 is connected to a temperature or displacement data acquisition system. A soil sample 11 is housed in the cavity of the freeze-thaw model box 9 . see Figure 5 , the soil sample 11 is embedded with a plurality of displacement sensors 5 and a corresponding number of...

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Abstract

The invention provides a freeze-thawing and weathering environment simulation system for compacted soil and a test method of the freeze-thawing and weathering environment simulation system. The devicecomprises an LED fluorescent lamp, liquid nitrogen refrigerating circulating equipment, a freeze-thawing model box, nitrogen heating circulating equipment and wind making equipment which are placed on an experimental platform, wherein a soil test sample is arranged in an inner cavity of the freeze-thawing model box. During working, a computer controls the refrigerating circulating equipment, thenitrogen heating circulating equipment and the wind making equipment. A dynamic camera monitors a freezing character of the soil test sample. A test method of the device comprises test steps of arranging sensors, compacting the soil test sample, installing monitoring equipment, debugging a data acquisition processor and a freeze-thawing circulating controller and the like. The device can control the acting time of freeze thawing cycle to realize automation of winter frozen soil simulation, can observe and measure a displacement change of soil and can observe mesoscopic characteristics in a test process of the test sample.

Description

technical field [0001] The invention relates to the technical field of engineering permafrost science, in particular to a compacted soil freeze-thaw and weathering environment simulation system. Background technique [0002] Frozen soil refers to various rocks and soils with a temperature at or below 0°C and contains ice. It is extremely sensitive to temperature and contains abundant underground ice. Therefore, permafrost has rheological properties, and its long-term strength is much lower than the instantaneous strength characteristics. Because of these characteristics, construction of engineering structures in permafrost must face two major dangers: frost heaving and thawing. What plays an important role is the existence form of water. When the water turns into ice, the volume increases, which makes the soil expand, and the surface of the earth is arched and raised, which is frost heaving; when the ice in the soil turns into water, the volume increases. When it shrinks, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/24
CPCG01N33/24
Inventor 邱珍锋李施衡曹婷
Owner CHONGQING JIAOTONG UNIVERSITY
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