CN103938658A - Structure capable of avoiding cold damage to high-temperature and unstable freeze soil area tunnel portal side slope - Google Patents
Structure capable of avoiding cold damage to high-temperature and unstable freeze soil area tunnel portal side slope Download PDFInfo
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- CN103938658A CN103938658A CN201410135146.7A CN201410135146A CN103938658A CN 103938658 A CN103938658 A CN 103938658A CN 201410135146 A CN201410135146 A CN 201410135146A CN 103938658 A CN103938658 A CN 103938658A
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Abstract
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
The present invention relates to tunnel portal side slope field, be specifically related to a kind of novel structure of avoiding the freeze injury of the unstable permafrost region tunnel portal of high temperature side slope.
Background technology
China's ever-frozen ground area accounts for 22% of territory total area, along with the high speed development that engineering in permafrost regions is built, more and more in the highway engineering of building and planning to build at permafrost region, and this just inevitably runs into Permafrost Area tunnel portal side slope freeze injury problem.China is in the built construction of tunnel of the unstable permafrost region of high temperature at present, and quite a few has occurred Tunnel slope thaw slumping or problem of frost heave, threatens retaining structure stability and travel safety.
When after the tunnel portal slope excavation of Permafrost Area, will break the original Heat And Water Balance of frozen soil, cause the disasters such as side slope thaw slumping and frost heave, threaten the stability of retaining structure.At present, processing the freeze injury of tunnel in cold area Tunnel slope, is mainly from the viewpoint of insulation and section draining.Adopt on the one hand the measure such as sunshade or warming plate, reduce side slope temperature by avoiding solar radiation or increasing thermal resistance; On the other hand, utilize dash low bank between fields to intercept the surface water that infiltrates tunnel portal side slope, utilize the structures such as insulation infiltration french drain to discharge the underground water of body inside, slope simultaneously, avoid freezing side slope retaining structure to produce frost-heave force because of underground water.But at the unstable permafrost region of high temperature, adopting Insulation to increase the thermal resistance of slope ground body, can only delay the thawing of ever-frozen ground, still can there is along with the increase of service life freeze thawing circulating phenomenon in slope ground body; On the other hand, when the absolute value of the cold degree of integrating is greater than year integrating temperature then, cuts a drainage system and still can, because underground water freezes to lose efficacy, be difficult to ensure its durability and long service performance, cannot fundamentally avoid the freeze injury of slope supporting structure.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, solves the unstable permafrost region tunnel portal of high temperature side slope freeze injury problem, and the present invention discloses a kind of novel structure of avoiding the freeze injury of the unstable permafrost region tunnel portal of high temperature side slope.
For this reason, the technical scheme that the present invention provides is:
A novel structure of avoiding the freeze injury of the unstable permafrost region tunnel portal of high temperature side slope, is characterized in that, from inner side to outside, comprises successively: slope ground body 1, ragstone layer 2 and slope supporting structure 3.In described ragstone layer 3, equidistantly lay tube wall and be provided with the ventilating duct 4 of air vent 5., towards cold wind direction dead season, discharge for convenience of air condensed water and rainwater simultaneously the upper end of ventilating duct 4, and its upper and lower two ends all arrange the gradient that horizontal cross is certain, and wherein the gutter 6 longitudinal with side slope bottom, lower end is connected; Two ports up and down at ventilating duct 4 arrange choke lid 7, and described choke lid 7 was opened in dead season, and warm season is closed it.Be laid with the square ventilation opening 8 corresponding with the position of ventilating duct 4 in described slope supporting structure 3 bottoms, and slope supporting structure 3 all the other below embedding earth's surface, position, to ensure the stable of retaining structure.
When application, the gradient at described ventilating duct two ends Shang Xia 4, can be defined as horizontal cross 2%-5%.
Based on said structure design scheme; form a kind of leitungskern structure of avoiding the freeze injury of the unstable permafrost region tunnel portal of high temperature side slope by ragstone layer 2 and tube wall thereof with the ventilating duct 4 of air vent 5; utilize the natural convection of cold air in ragstone layer 2 the quick aeration-cooling feature in conjunction with ventilating duct 4; adjust the state of temperature of side slope by the hot transporting mechanism in change slope ground body, reach the object of protection ever-frozen ground.
Specifically, this structure (for example adopts the realization such as retaining wall or Reinforced Concrete Retaining Walls at the unstable Permafrost Area of high temperature tunnel portal side slope surface and slope supporting structure, be all prior art) between lay ragstone layer with adherent form, wherein contain the ventilating duct with air vent, and at the upper and lower two ends of ventilating duct, choke lid 7 is set.Because ragstone layer is originally as loose structure, between slabstone, contain larger space, air can flow freely in space, and now the heat exchange pattern in slope ground body will be heat transfer-convection current CGCM from single heat transfer mode-conversion.In dead season, because atmospheric temperature is lower than formation temperature, the cold air that density is larger sinks to entering slope ground body 1 along the space between slabstone, replace the less hot air of density in stratum simultaneously, in ragstone layer, form heat convection, impel the heat loss in side slope body stratum, play the effect to Rock And Soil cooling.At warm season, because atmospheric temperature is higher than Rock And Soil temperature, the hot air that now density is less cannot sink to entering side slope body, has stoped cold air in the body of slope and extraneous interchange of heat, makes stratum still can keep lower temperature.In sum, the resultant effect that ragstone layer rose is cold air input and inputs much larger than hot air, therefore can ensure that slope ground body is all the time in low-temperature condition, can increase the cold reserves in stratum, make frozen soil upper limit increase, ensure that retaining structure can not destroy because of freeze thawing ringing or thaw slumping.
Meanwhile, in air chimney end, choke lid 7 is set, opens in dead season, ensure cold air circulation in pipe, to accelerate roadbed heat radiation, play storage cold-working and use; Close at warm season, to stop external heat to import roadbed into, avoid hot blast to circulate by air chimney, play heat-blocking action.This structure can realize and reduce slope ground temperature, increases the cold reserves in stratum, promotes the effect of Upper Limit of Permafrost, thereby avoids the freeze injury of slope supporting structure under freeze thawing ringing.
Compared with prior art, the beneficial effect that technical solution of the present invention structure design must be brought is:
Proposition utilizes the natural convection circulation of cold air in ragstone layer and with aeration-cooling feature fast in the air chimney of air vent, the unstable permafrost region tunnel portal of high temperature side slope is carried out to the initiatively new concept of cooling, to reduce side slope temperature, promote frozen soil upper limit, to increase the cold reserves in stratum as final purpose, can fundamentally solve the unstable permafrost region tunnel portal of high temperature slope supporting structure freeze injury problem.
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described:
Fig. 1 is structure elevation of the present invention.
Fig. 2 is A-A ' cross section drawing in side sectional elevation in Fig. 1.
Fig. 3 is B-B ' cross section drawing in side sectional elevation in Fig. 1: safeguard structure structure chart dead season a).
Fig. 4 is B-B ' cross section drawing in side sectional elevation in Fig. 1: safeguard structure warm season structure chart b).
Fig. 5 is ventilating duct drawing.
In figure: 1-slope ground body; 2-ragstone layer; 3-slope supporting structure; 4-ventilating duct; 5-air vent; 6-gutter; 7-choke lid; 8-ventilation opening.
Detailed description of the invention
implementation of an application example
as Figure 1-Figure 5,when practical application, side slope body excavates after design grade by regulation and stipulation, and by domatic leveling, at it, domatic and ground is L-type wall-attaching type and lays the about 20cm of particle diameter left and right, the ragstone layer 2 that thickness is 0.5-1.0m.The inner S type PVC ventilating ducts 4 of evenly laying diameter 20-30cm of ragstone layer 2, spacing is 4-5 times of caliber, ventilating duct 4 bodys are blossom type and are evenly arranged the air vent 5 of diameter 5cm, unobstructed to ensure the convection current in ragstone layer 2 of air in ventilating duct 4; Ventilating duct 4 bottoms arrange the gradient of 2%-5%, are connected, to discharge the rainwater or the snow-broth that enter in air chimney with longitudinal drainage ditch 6 at the bottom of slope; Ventilating duct 4 Po Ding top, top 5-10cm At The Heights arrange level to horizontal wall inscription, avoid rainwater under condition of raining to flow directly in body; Make the lateral part of ventilating duct 4 upper ends towards cold wind direction dead season, choke lid 7 is set two ends at ventilating duct Shang Xia 4, open in dead season, warm season is closed, to ensure to circulate to greatest extent cold air simultaneously; At ragstone layer 2 outside adherent construction side slope body retaining structure 3(retaining wall or Reinforced Concrete Retaining Walls), slope supporting structure 3 embeds the following certain depth in earth's surface, to ensure under soil pressure the stability of self; Slope supporting structure 3 arranges the square ventilation opening 8 that the length of side is 40-50cm at ventilating duct 4 positions, ensure the cross-ventilation of ragstone layer 2 inside.
The engineering construction implementation of the present embodiment structure: after (1) Tunnel slope body excavation, flatten processing by the gradient of code requirement to domatic.
(2) select explosion piece stone or quarry stone material in the tunnel about particle diameter 20cm, at the ragstone layer 2 of the adherent construction thickness of domatic higher slice 0.5-1.0m thickness.
(3) at the PVC ventilating duct 4 of air chimney design attitude laying diameter 20-30cm, upper and lower two ends adopt curved joint to connect, and the gradient of 2%-5% is all set, and the interior water body of convenient pipe is discharged, and upper end exceeds side slope surface 5-10cm.
(4) the processing choke lid 7 slightly large with ventilating duct 4 external diameters, carries out shutoff at warm season to ventilating duct 4.
(5) at slope angle position construction barricade foundation ditch, at ragstone layer 2 outsides construction side slope body retaining structure 3(retaining wall or Reinforced Concrete Retaining Walls), not being set, air chimney position embeds in Rock And Soil.
(6) in top application work gutter, barricade other places 6.
The beneficial effect that embodiment of the present invention technical scheme structure design must be brought is:
(1) propose to utilize the natural convection circulation of cold air in ragstone layer and with aeration-cooling feature fast in the air chimney of air vent, the unstable permafrost region tunnel portal of high temperature side slope is carried out to the initiatively new concept of cooling, to reduce side slope temperature, promote frozen soil upper limit, to increase the cold reserves in stratum as final purpose, can fundamentally solve the unstable permafrost region tunnel portal of high temperature slope supporting structure freeze injury problem;
(2) slabstone protective slope structure, raw material drawing is convenient, can utilize country rock after tunnel borehole blasting or the stone material of highway quarry directly to lay;
(3) in construction and operation process, side slope body is melted to disturbance without any heat, pollution-free, and without any power-equipment, do not destroy ecological environment;
(4), from construction and operation cost angle, ragstone layer and PVC ventilation tubing protective slope structure, without insulation and drainage system, can reduce investment outlay greatly, and without later maintenance expense.
Claims (2)
1. the structure that can avoid the freeze injury of the unstable permafrost region tunnel portal of high temperature side slope, is characterized in that, from inner side to outside, comprises successively: slope ground body (1), ragstone layer (2) and slope supporting structure (3);
In described ragstone layer (3), equidistantly lay the ventilating duct (4) that tube wall is provided with air vent (5); The upper end of described ventilating duct (4) is towards cold wind direction dead season,, its upper and lower two ends are provided with the horizontal cross gradient, and wherein the gutter (6) longitudinal with side slope bottom, lower end is connected; Two ports up and down at ventilating duct (4) arrange choke lid (7), and described choke lid (7) was opened in dead season, and warm season is closed it;
Be laid with the square ventilation opening (8) corresponding with the position of ventilating duct (4) in described slope supporting structure (3) bottom, and slope supporting structure (3) all the other below embedding earth's surface, position.
2. the structure of avoiding the freeze injury of the unstable permafrost region tunnel portal of high temperature side slope as claimed in claim 1, is characterized in that, the gradient at the upper and lower two ends of described ventilating duct (4) is horizontal cross 2%-5%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410135146.7A CN103938658A (en) | 2014-04-04 | 2014-04-04 | Structure capable of avoiding cold damage to high-temperature and unstable freeze soil area tunnel portal side slope |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410135146.7A CN103938658A (en) | 2014-04-04 | 2014-04-04 | Structure capable of avoiding cold damage to high-temperature and unstable freeze soil area tunnel portal side slope |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104358265A (en) * | 2014-11-06 | 2015-02-18 | 兰州理工大学 | Active refrigeration and self-recovery cold region side slope support structure and construction method |
| CN106677229A (en) * | 2017-02-24 | 2017-05-17 | 中冶长天国际工程有限责任公司 | Pipe network system for treating frozen soil of tailings pond by combining drainage facility and construction method for pipe network system |
| CN106759232A (en) * | 2017-02-24 | 2017-05-31 | 中冶长天国际工程有限责任公司 | Pipe network system and its construction method for administering frozen soil in Tailings Dam |
| CN107201702A (en) * | 2016-03-17 | 2017-09-26 | 中国科学院寒区旱区环境与工程研究所 | Convection current regulates and controls the ventilated formula frozen soil ventilation embankment of full wall |
| CN108316082A (en) * | 2018-05-10 | 2018-07-24 | 俞祁浩 | A kind of cooling structure of frozen earth roadbed slope surface and the hollow stepped construction of cooling |
| CN113638442A (en) * | 2021-08-17 | 2021-11-12 | 中国科学院西北生态环境资源研究院 | Cutting retaining wall unit with automatic diversion function and manufacturing method thereof |
| CN114606973A (en) * | 2022-01-26 | 2022-06-10 | 新疆交通规划勘察设计研究院有限公司 | Earth work check room retaining wall structure |
| CN115822640A (en) * | 2022-11-04 | 2023-03-21 | 中国科学院西北生态环境资源研究院 | Frozen soil tunnel entrance to a cave protection system |
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| JP2003105746A (en) * | 2001-09-28 | 2003-04-09 | Haipaa:Kk | Design method for in-soil drainage layer and in-soil drainage structure |
| CN2679247Y (en) * | 2004-01-08 | 2005-02-16 | 中国科学院寒区旱区环境与工程研究所 | Heat isolating and temp lowering appts. for protecting for frozen earth |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104358265A (en) * | 2014-11-06 | 2015-02-18 | 兰州理工大学 | Active refrigeration and self-recovery cold region side slope support structure and construction method |
| CN107201702A (en) * | 2016-03-17 | 2017-09-26 | 中国科学院寒区旱区环境与工程研究所 | Convection current regulates and controls the ventilated formula frozen soil ventilation embankment of full wall |
| CN106759232B (en) * | 2017-02-24 | 2018-09-28 | 中冶长天国际工程有限责任公司 | Pipe network system and its construction method for administering frozen soil in Tailings Dam |
| CN106759232A (en) * | 2017-02-24 | 2017-05-31 | 中冶长天国际工程有限责任公司 | Pipe network system and its construction method for administering frozen soil in Tailings Dam |
| CN106677229B (en) * | 2017-02-24 | 2018-09-28 | 中冶长天国际工程有限责任公司 | The pipe network system and its construction method of Tailings Dam frozen soil are administered in conjunction with water seepage drainage facility |
| CN106677229A (en) * | 2017-02-24 | 2017-05-17 | 中冶长天国际工程有限责任公司 | Pipe network system for treating frozen soil of tailings pond by combining drainage facility and construction method for pipe network system |
| CN108316082A (en) * | 2018-05-10 | 2018-07-24 | 俞祁浩 | A kind of cooling structure of frozen earth roadbed slope surface and the hollow stepped construction of cooling |
| CN108316082B (en) * | 2018-05-10 | 2023-09-29 | 俞祁浩 | Cooling structure of frozen soil roadbed slope and hollow laminated structure for cooling |
| CN113638442A (en) * | 2021-08-17 | 2021-11-12 | 中国科学院西北生态环境资源研究院 | Cutting retaining wall unit with automatic diversion function and manufacturing method thereof |
| CN113638442B (en) * | 2021-08-17 | 2023-01-03 | 中国科学院西北生态环境资源研究院 | Cutting retaining wall unit with automatic diversion function and manufacturing method thereof |
| CN114606973A (en) * | 2022-01-26 | 2022-06-10 | 新疆交通规划勘察设计研究院有限公司 | Earth work check room retaining wall structure |
| CN115822640A (en) * | 2022-11-04 | 2023-03-21 | 中国科学院西北生态环境资源研究院 | Frozen soil tunnel entrance to a cave protection system |
| CN115822640B (en) * | 2022-11-04 | 2023-11-28 | 中国科学院西北生态环境资源研究院 | Frozen soil tunnel portal protection system |
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Application publication date: 20140723 |