A pipeline type hollow control layer for cooling a frozen soil roadbed slope surface

Abstract

The invention discloses a pipeline type hollow control layer for cooling a frozen soil roadbed slope surface; the pipeline type hollow control layer is laid on the roadbed slope surface, and two endsof the pipeline type hollow control layer are respectively close to the slope surface top and the slope surface bottom of the roadbed slope surface. The pipeline type hollow control layer is providedwith a first ventilation opening correspondingly close to the top of the slope surface and a second ventilation opening correspondingly close to the bottom of the slope surface; the first ventilationopening communicates with the second ventilation opening so as to form a bidirectional commutation channel from the top of the slope surface to the bottom of the slope surface and / or from the bottom of the slope surface to the top of the slope surface, thus accelerating the air convection in the pipeline type hollow control layer so as to cool off the roadbed slope surface; the pipeline type hollow control layer is of a single-layer structure or a multi-layer structure formed by arranging a plurality of hollow pipes in parallel.

Description

technical field [0001] The invention relates to the field of frozen soil engineering, in particular to a pipeline-type hollow control layer used for cooling the slope surface of frozen soil subgrade. Background technique [0002] Frozen soil is a kind of soil and rock with a temperature lower than 0°C and containing ice. The mechanical strength of frozen soil will change greatly with the change of temperature: the lower the temperature, the greater its strength. When the temperature is lower than -1.5°C, Its instantaneous compressive strength is equivalent to that of ordinary rocks; when the temperature is higher than -0.5°C to 0°C, its compressive strength is equivalent to that of ordinary soil blocks, or even basically lost. Therefore, in order to ensure the smooth progress and long-term stability of major projects in cold regions, scientific workers in cold regions in my country, based on national conditions, focus on major national projects such as the Qinghai-Tibet Rail...

AI Technical Summary

Problems solved by technology

[0004] However, the hollow block slope protection measures have the following disadvantages: (1) at the construction site, they must be manually discharged one by one, first in rows and then in columns, and finally stacked layer by layer, which is cumbersome and inefficient; (2) due to manual discharge and stacking, it is difficult to To ensure the absolute neatness and alignment of the hollow blocks, the mutual misalignment of the middle hollow blocks often occurs, resulting in the narrowing or blockage of the central airflow channel of the hollow block, which affects the efficiency of ventilation, convection and heat transfer; (3) Inaccurately pay attention to the entire hollow block slope protection during construction The position of the air vent at the shoulder end of the measure is randomly placed according to the feeling, which usually makes the air flow inside the hollow block less and the flow process is slow, and usually there is only the air flow process from the toe of the slope up to the shoulder, which leads to convection. The thermal effect is not strong; (4) Due to the slow internal air flow rate, as the heat-exchanging air continues to absorb heat, the air temperature increases continuously from the toe of the subgrade slope to the top of the roof, that is, there is a temperature difference in the overall control layer A large phenomenon is not conducive to the overall regulation of the temperature field of the subgrade

[0005] Especially in today's highway roadbed with wider width and black road surface with greater heat absorption, in the face of more intense heat absorption and complex heat transfer process of the roadbed, the cooling efficiency of existing measures is difficult to meet the actual engineering needs. The emergence of slope control measures with more prominent cooling efficiency is urgently needed

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