Structure capable of avoiding cold damage to high-temperature and unstable freeze soil area tunnel portal side slope
A technology for permafrost areas and slopes, which is used in infrastructure engineering, excavation, protection devices, etc., can solve the problems of tunnel entrance slopes and frost damage in unstable permafrost areas, so as to solve the problem of freezing damage of supporting structures and reduce edge damage. Slope temperature, the effect of increasing formation cold storage
Inactive Publication Date: 2014-07-23
TONGJI UNIV
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Problems solved by technology
[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and solve the problem of freezing damage to tunnel entrance slopes in high-temperature
Method used
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[0021] Implement application examples
[0022] Such as Figure 1-Figure 5 as shown, In actual application, after the slope body is excavated to the design slope according to the regulations, the slope surface is leveled, and flakes with a particle size of about 20cm and a thickness of 0.5-1.0m are laid on the slope surface and the ground in an L-shaped wall-mounted manner. Layer 2. S-shaped PVC ventilation ducts 4 with a diameter of 20-30 cm are evenly arranged inside the flake layer 2, and the spacing is 4-5 times the pipe diameter. The convection of the air in the flake layer 2 is smooth; the bottom end of the ventilation pipe 4 is provided with a slope of 2%-5%, and is connected with the longitudinal drainage ditch 6 at the bottom of the slope, so as to discharge the rainwater or snow water entering the ventilation pipe; the top of the ventilation pipe 4 Set a horizontal transverse slope at a height of 5-10cm on the top of the slope to avoid rainwater directly flowing...
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The invention relates to the field of tunnel portal side slopes, in particular to a structure capable of avoiding cold damage to a high-temperature and unstable freeze soil area tunnel portal side slope. The structure comprises a side slope rock and earth mass, a rubble stone layer and a side slope retaining structure. Ventilation pipelines are distributed in the rubble stone layer at equal intervals. The wall of each ventilation pipeline is provided with ventilation holes. The upper end of each ventilation pipeline faces the cold air direction of the cold season. The upper end and the lower end of each ventilation pipeline are respectively provided with a horizontal cross slope. The lower end of each ventilation pipeline is connected with a longitudinal drainage ditch. The upper port and the lower port of each ventilation pipeline are respectively provided with a wind stop cover. Square ventilation ports corresponding to the ventilation pipelines in portion are distributed at the bottom of the side slope retaining structure. The rest of the side slope retaining structure is embedded into the ground surface. By the utilization of the characteristics of natural convection circulation of cold air in the rubble stone layer and rapid ventilation and cooling in the ventilation pipelines with the ventilation holes, the high-temperature and unstable freeze soil area tunnel portal side slope is automatically cooled, the temperature of the side slope is reduced, the upper limit of freeze soil is increased, cold reserves of a stratum are increased, and the problem of cold damage to the retaining structure of the high-temperature and unstable freeze soil area tunnel portal side slope is solved.
Description
technical field [0001] The invention relates to the field of tunnel entrance slopes, in particular to a novel structure for avoiding freezing damage to tunnel entrance slopes in high-temperature unstable permafrost regions. Background technique [0002] The area of permafrost in my country accounts for 22% of the total land area. With the rapid development of engineering construction in permafrost areas, more and more highway projects are under construction or proposed in permafrost areas, which inevitably encounters permafrost. Frost damage problem of tunnel entrance slope in soil area. At present, a considerable part of the tunnel projects that have been built in high-temperature unstable permafrost regions in my country have thermal-thaw slump or frost heave problems on the slopes of the tunnel entrances, which threaten the stability of the retaining structure and the safety of driving. [0003] When the slope of the tunnel entrance in the permafrost region is excavated...
Claims
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Login to view more IPC IPC(8): E02D31/14E02D17/20
Inventor 沈世伟夏才初黄继辉
Owner TONGJI UNIV
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