A method for maintaining long-term stability of freeze-thaw slopes in high-altitude cold regions

Abstract

The invention discloses a method for maintaining the long-term stability of a freeze-thaw slope in a high-altitude cold region, which includes the following steps: (1) collecting and sorting out the meteorological data of the slope engineering area over the years, summarizing the temperature range of the slope engineering area, the annual average temperature, The thickness of the freeze-thaw zone of rock and soil. (2) Determine the length of the heat transfer tube, the length of the evaporation section, the length of the adiabatic section, and the length of the condensation section. Ensure that the evaporating section is in the freeze-thaw zone, and the condensing section can dissipate heat through the cooling fins in time. (3) Determine the layout range and density of heat transfer pipes in the slope engineering area. (4) Install the heat transfer tube. (5) Slope shotcrete support. This control method uses the temperature difference between the upper and lower sides of the heat conduction pipe to bring the heat inside the freeze-thaw circle to the air and release it, so as to keep the temperature of the permafrost layer constant, and change passive control into active protection to prevent freeze-thaw disasters in slope engineering, achieving safety, economy, and safety. High efficiency, environmental protection, simple construction, active protection effect.

Description

technical field [0001] The invention relates to the technical field of slope engineering anchoring, in particular to a method for maintaining the long-term stability of a freeze-thaw slope in a high-altitude cold region. Background technique [0002] The area of ​​permafrost and seasonally frozen soil accounts for about 50% of the earth's land area, and the distribution area of ​​permafrost and seasonally frozen soil in my country accounts for more than 70% of the country's land area, mainly distributed in the high-altitude cold regions of the west and northeast . The airside of the slope project in this area is directly exposed to the air. Due to the diurnal and seasonal changes in climate and temperature, the positive and negative temperature differences are large, and the moisture inside the rock and soil is continuously frozen and thawed, forming a freeze-thaw circle within a certain range. As time goes by, the freeze-thaw cycle will continue to erode the rock mass, and ...

AI Technical Summary

Problems solved by technology

The change of climate temperature will form a freeze-thaw circle on the surface of the rock mass of the slope, and the freeze-thaw cycle will continuously erode the rock mass, resulting in the expansion of cracks in the freeze-thaw circle, the reduction of bearing capacity, and the phenomenon of spalling, chipping, and sandification on the surface of the rock mass. The effect gradually dissipates, and the slope maintenance cannot be guaranteed, so the protective effect is not obvious, and the long-term performance is poor

[0005] 2) Install thermal insulation layer and secondary support: This type of protection is provided with a layer of thermal insulation layer between the primary protection and the secondary lining to prevent the change of external climate temperature from being transmitted to the interior of the rock mass and reduce heat exchange. It has certain positive significance for the prevention and control of freeze-thaw disasters, but there are still some problems. For example, the thermal insulation layer can block the freezing back of the surrounding rock freeze-thaw zone. When it is cold, the rock mass in the freeze-thaw zone cannot be further frozen or slowed down. The freezing speed is reduced, and the cost of secondary lining is high, and the economy is poor

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