CN111911227A - Exploration design method for seasonal frozen soil highway tunnel - Google Patents
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- CN111911227A CN111911227A CN202010685758.9A CN202010685758A CN111911227A CN 111911227 A CN111911227 A CN 111911227A CN 202010685758 A CN202010685758 A CN 202010685758A CN 111911227 A CN111911227 A CN 111911227A
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- 238000013461 design Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 29
- 230000001932 seasonal effect Effects 0.000 title claims abstract description 22
- 239000002689 soil Substances 0.000 title claims description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 38
- 238000007710 freezing Methods 0.000 claims abstract description 24
- 230000008014 freezing Effects 0.000 claims abstract description 20
- 238000009413 insulation Methods 0.000 claims abstract description 14
- 230000002265 prevention Effects 0.000 claims abstract description 8
- 239000002352 surface water Substances 0.000 claims abstract description 5
- 238000004321 preservation Methods 0.000 claims description 17
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 7
- 239000001301 oxygen Substances 0.000 claims description 7
- 229910052760 oxygen Inorganic materials 0.000 claims description 7
- 238000013507 mapping Methods 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 6
- 239000012774 insulation material Substances 0.000 claims description 5
- 230000006378 damage Effects 0.000 claims description 3
- 238000005553 drilling Methods 0.000 claims description 3
- 238000009825 accumulation Methods 0.000 claims description 2
- 238000010276 construction Methods 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 208000027418 Wounds and injury Diseases 0.000 description 2
- 208000014674 injury Diseases 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- 210000003437 trachea Anatomy 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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Abstract
The invention discloses a reconnaissance design method for a seasonal frozen earth highway tunnel, which belongs to the technical field of tunnel reconnaissance design and comprises the following steps: establishing a miniature meteorological observation value in a proposed tunnel site area, and collecting meteorological data of the tunnel site area; surveying, collecting surface water distribution, underground water level and variation range, collecting the freezing depth and underground water distribution condition of a tunnel site area, and predicting the maximum water inflow of each section of the tunnel along the way; determining the inner contour of the tunnel, and calculating the distribution condition of the air temperature in the tunnel along the way, wherein the temperature is 0 ℃ as a boundary; designing a hole opening and a hole door, calculating frost heaving force, determining lining parameters, and determining the thicknesses of a tunnel lining and a ditch heat-insulating layer; the design of water prevention and drainage, namely, the heat insulation design of a tunnel water prevention and drainage system is required at the heat insulation section of the tunnel; the method is clear in thought, strong in operability and strong in pertinence, and is proved to be feasible and reliable in project practice in a plurality of western and Sichuan regions.
Description
Technical Field
The invention belongs to the technical field of tunnel reconnaissance design, and particularly relates to a reconnaissance design method for a seasonal frozen soil highway tunnel.
Background
In recent years, more and more highways in alpine regions are planned and constructed. The highway brings great convenience to traffic in seasonally frozen soil areas. But due to the special low-temperature and rich-water meteorological and hydrogeological conditions, great difficulty is brought to the construction of tunnels in cold regions. The tunnel lining cracking, ice hanging and frost heaving of a plurality of cold areas bring great potential safety hazards to the tunnel operation. For many years, how to improve the anti-freezing performance of the cold region tunnel is always the key point, the difficulty point and the pain point of the cold tunnel construction.
At present, the research work of tunnel lining heat preservation and frost resistance in cold regions of various countries is mainly focused on two aspects. First, basic theoretical research work. The method is particularly used for researching the freezing and thawing characteristics of the tunnel surrounding rock, the freezing depth, the thermal performance of the tunnel surrounding rock, the concrete tunnel lining and the heat-insulating material, the structural form design of the tunnel lining, and the influence of the conditions of engineering site climate, hydrology and the like. The second is the research work of the application technology. On the basis of basic theoretical research work, the technical measures of heat preservation and frost resistance of the tunnel are taken, a durable heat preservation and insulation material is developed, and the reasonable thickness, the set length, the set form and the like of the heat preservation and insulation layer are researched. However, no matter the national standard or the industrial standard, no standard for designing the tunnel in the cold region exists, and the design method of the seasonal frozen soil highway tunnel is provided by combining the design experiences of a plurality of seasonal frozen soils.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the technical problem in the prior art, and the invention aims to provide a method.
The invention is realized by the following technical scheme:
a reconnaissance design method for seasonal frozen soil highway tunnels comprises the following steps:
the first step is as follows: establishing a miniature meteorological observation value in a proposed tunnel address area, and respectively setting at an inlet and an outlet of a tunnel under the condition of a condition to collect meteorological data of the tunnel address area, wherein the specific collected data are as follows;
firstly, the average temperature of the coldest month at the opening is used for judging the cold degree, and the cold area is determined as the area with the average temperature of the coldest month being less than or equal to-10 ℃ and the cold area with the average temperature of the coldest month being less than-10 ℃ and less than 0 ℃; the average temperature of the coldest month is more than or equal to 0 ℃, and the average temperature is a general area, wherein heat preservation design is required in severe cold areas and cold areas;
the maximum freezing depth is used for judging the depth of the central drainage ditch needing to be buried so as not to be damaged by freezing;
thirdly, the annual average oxygen partial pressure of the air pipe at the tunnel entrance is used for determining the construction work efficiency and determining the oxygen generation and supply mode;
wind direction, wind speed and snow line in winter are used for judging whether the tunnel portal blows snow or not and selecting the elevation of the tunnel portal;
the second step is that: surveying, collecting surface water distribution, underground water level and variation range, collecting the freezing depth and underground water distribution condition of a tunnel site area, and predicting the maximum water inflow of each section of the tunnel along the way, besides conventional engineering geology and hydrogeology collection; hydrological surveys should be surveyed separately in different seasons. Measures and paragraphs for determining deep grouting water plugging are provided, underground water is extremely rich, a route is recommended to be adjusted or advanced full-face grouting is recommended, and a treatment mode of plugging removal combination can be adopted when the underground water is small;
the third step: determining the inner contour of the tunnel, calculating the distribution condition of the air temperature in the tunnel along the way, and determining the length of the heat preservation section of the tunnel by taking 0 ℃ as a boundary;
the fourth step: designing a hole opening and a hole door, calculating frost heaving force, determining lining parameters, and determining the thicknesses of a tunnel lining and a ditch heat-insulating layer; the calculation formula is a Japanese Higashi formula;
y＝91.6(-x)0.863
in the above formula, x is the temperature of the hole (calculated temperature, negative value, wherein the value of the calculated temperature is as follows: the average temperature of the lowest month is 10 ℃ lower for northeast, northChina, northwest (not containing Xinjiang) and three states of Sichuan, and the average temperature of the lowest month is 15 ℃ lower for Sinkiang autonomous region); wherein, northeast, northChina, northwest (not containing Sinkiang) and Sichuan Sanzhou areas are cold areas, the temperature difference is less than a threshold value, the value is that the average temperature of the lowest month is reduced by 10 ℃, for Sinkiang autonomous areas and inner Mongolia areas which are cold areas, the temperature difference is greater than the threshold value, the average temperature of the lowest month is reduced by 15 ℃, and the occurrence of freezing injury can be reasonably avoided.
y is the distance between the point at 0 ℃ in the hole and the hole opening.
The fifth step: the design of water prevention and drainage, namely, the heat insulation design of a tunnel water prevention and drainage system is required at the heat insulation section of the tunnel; the cold area adopts the heat insulation ditch, the severe cold area adopts the deep-buried ditch or winter protection sluiceway, the longitudinal wall back drain pipe and horizontal drain pipe under the road surface, etc. need to adopt the heat insulation material to wrap up;
and a sixth step: and after the tunnel is communicated, verifying whether the temperature in the tunnel is consistent with the temperature in the design stage, and correcting the thicknesses of the lining and the ditch heat-insulating layer in time.
The invention further preferably establishes a miniature meteorological observation value in a proposed tunnel address area, and sets the miniature meteorological observation value at an inlet and an outlet of the tunnel respectively to collect meteorological data of the tunnel address area.
Further preferably, the collecting of meteorological data includes collecting an average temperature of a coldest month at the tunnel opening, a maximum freezing depth, an average annual trachea oxygen partial pressure at the tunnel opening, and a winter wind direction and a wind speed.
The invention further preferably adopts the average temperature of the coldest month at the opening of the cave to judge the cold degree, the cold region is the area with the average temperature of the coldest month being less than or equal to minus 10 ℃ and the cold region is the area with the average temperature of the coldest month being less than minus 10 ℃ and less than 0 ℃; wherein, the severe cold area and the cold area need to be designed for heat preservation.
Further preferably, the method of the invention comprises the steps of data acquisition, engineering geological mapping, hydrogeological mapping, geophysical prospecting, drilling, field testing or laboratory testing.
According to the invention, the inner contour of the seasonal frozen soil tunnel meets the requirements of the conventional tunnel, and is provided with a heat-preservation and anti-freezing layer, wherein the inner contour of the frozen soil tunnel generally needs to be increased by 5-15 cm.
According to the further optimization of the invention, the hole opening is selected to be in a position which is exposed to the sun, not easy to accumulate snow, easy to drain water and below a snow line, a snow-proof shed hole is suitable to be arranged at the hole opening, the portal foundation is arranged below the freezing depth and is not less than 0.25m, and the side slope protection grade of the hole opening is enhanced by one grade or the slope rate is slowed down by one grade compared with the conventional protection.
In a further preferred embodiment of the invention, the lining structure design should take into account the effects of frost heaving and thaw collapse in addition to meeting the conventional design, and the lining structure and dimensions are determined by engineering analogy.
In a further preferred embodiment of the invention, the cold area adopts a heat-preservation ditch, the severe cold area adopts a deep-buried ditch or a cold-proof drainage tunnel, and the longitudinal wall back drainage pipe and the transverse drainage pipe under the road surface are wrapped by heat-preservation materials.
According to the invention, further optimization is carried out, whether the air temperature in the tunnel is consistent with that calculated in the design stage or not is further verified within three years, and if the actually measured length of the heat-insulating layer to be insulated is larger than the implemented length or the temperature is lower than the calculated temperature, the length or the thickness of the heat-insulating layer of the lining and the ditch is corrected in time.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the method is suitable for seasonal frozen soil highway tunnels, micro meteorological observation values are established in a planned tunnel site area, surface water distribution, underground water level and variation range are required to be collected in addition to conventional engineering geology and hydrogeology collection, the freezing depth and underground water distribution conditions of the tunnel site area are collected, the maximum water inflow of each section of the tunnel along the way is predicted, heat insulation design is carried out on the inner contour of the tunnel, the tunnel lining and the water ditch, and after the tunnel is finished, the thicknesses of the lining and the water ditch heat insulation layer are corrected in time.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic view of the survey design process of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: it is not necessary to employ these specific details to practice the present invention. In other instances, well-known structures, circuits, materials, or methods have not been described in detail so as not to obscure the present invention.
Throughout the specification, reference to "one embodiment," "an embodiment," "one example," or "an example" means: the particular features, structures, or characteristics described in connection with the embodiment or example are included in at least one embodiment of the invention. Thus, the appearances of the phrases "one embodiment," "an embodiment," "one example" or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Further, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the description of the present invention, it is to be understood that the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "high", "low", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the scope of the present invention.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The present invention will be described in detail with reference to fig. 1.
The first embodiment is as follows: a reconnaissance design method for seasonal frozen soil highway tunnels comprises the following steps:
the first step is as follows: establishing a miniature meteorological observation value in a proposed tunnel address area, and respectively setting at an inlet and an outlet of a tunnel under the condition of a condition to collect meteorological data of the tunnel address area, wherein the specific collected data are as follows;
firstly, the average temperature of the coldest month at the opening is used for judging the cold degree, and the cold area is determined as the area with the average temperature of the coldest month being less than or equal to-10 ℃ and the cold area with the average temperature of the coldest month being less than-10 ℃ and less than 0 ℃; the average temperature of the coldest month is more than or equal to 0 ℃, and the average temperature is a general area, wherein heat preservation design is required in severe cold areas and cold areas;
the maximum freezing depth is used for judging the depth of the central drainage ditch needing to be buried so as not to be damaged by freezing;
thirdly, the annual average oxygen partial pressure of the air pipe at the tunnel entrance is used for determining the construction work efficiency and determining the oxygen generation and supply mode;
wind direction, wind speed and snow line in winter are used for judging whether the tunnel portal blows snow or not and selecting the elevation of the tunnel portal;
the second step is that: surveying, collecting surface water distribution, underground water level and variation range, collecting the freezing depth and underground water distribution condition of a tunnel site area, and predicting the maximum water inflow of each section of the tunnel along the way, besides conventional engineering geology and hydrogeology collection; hydrological surveys should be surveyed separately in different seasons. Measures and paragraphs for determining deep grouting water plugging are provided, underground water is extremely rich, a route is recommended to be adjusted or advanced full-face grouting is recommended, and a treatment mode of plugging removal combination can be adopted when the underground water is small;
the third step: determining the inner contour of the tunnel, calculating the distribution condition of the air temperature in the tunnel along the way, and determining the length of the heat preservation section of the tunnel by taking 0 ℃ as a boundary;
the fourth step: designing a hole opening and a hole door, calculating frost heaving force, determining lining parameters, and determining the thicknesses of a tunnel lining and a ditch heat-insulating layer; the calculation formula is a Japanese Higashi formula;
y＝91.6(-x)0.863
in the above formula, x is the temperature of the hole (calculated temperature, negative value, wherein the value of the calculated temperature is as follows: the average temperature of the lowest month is 10 ℃ lower for northeast, northChina, northwest (not containing Xinjiang) and three states of Sichuan, and the average temperature of the lowest month is 15 ℃ lower for Sinkiang autonomous region); wherein, northeast, northChina, northwest (not containing Sinkiang) and Sichuan Sanzhou areas are cold areas, the temperature difference is less than a threshold value, the value is that the average temperature of the lowest month is reduced by 10 ℃, for Sinkiang autonomous areas and inner Mongolia areas which are cold areas, the temperature difference is greater than the threshold value, the average temperature of the lowest month is reduced by 15 ℃, and the occurrence of freezing injury can be reasonably avoided.
y is the distance between the point at 0 ℃ in the hole and the hole opening.
The fifth step: the design of water prevention and drainage, namely, the heat insulation design of a tunnel water prevention and drainage system is required at the heat insulation section of the tunnel; in particular to a heat preservation ditch adopted in cold areas. Deep-buried ditches or cold-proof water drainage holes are adopted in severe cold areas. The longitudinal wall back drain pipe and the transverse drain pipe below the road surface need to be wrapped by heat insulation materials.
And a sixth step: and after the tunnel is communicated, verifying whether the temperature in the tunnel is consistent with the temperature in the design stage, and correcting the thicknesses of the lining and the ditch heat-insulating layer in time.
The invention further preferably establishes a miniature meteorological observation value in a proposed tunnel address area, and sets the miniature meteorological observation value at an inlet and an outlet of the tunnel respectively to collect meteorological data of the tunnel address area.
The second embodiment: collecting meteorological data, including collecting the average temperature of the coldest month at the cave entrance, the maximum freezing depth, the annual average oxygen partial pressure of a gas pipe at the tunnel cave entrance and the wind direction and the wind speed in winter, wherein the average temperature of the coldest month at the cave entrance is used for judging the cold degree, the cold region is the area with the average temperature of the coldest month being less than or equal to minus 10 ℃, and the cold region is the area with the average temperature of the coldest month being less than minus 10 ℃ and less than 0 ℃; wherein, the severe cold area and the cold area need to be designed for heat preservation.
The third embodiment is as follows: when the exploration is carried out, the means of data, engineering geology mapping, hydrogeology mapping, geophysical prospecting, drilling, field testing or indoor testing are adopted.
Besides meeting the requirements of a conventional tunnel, the inner contour of the seasonal frozen soil tunnel is provided with a heat-insulating and anti-freezing layer, and the inner contour of the frozen soil tunnel is generally increased by 5-15 cm.
The fourth embodiment is as follows: the hole opening is selected to be in a position exposed to the sun, not prone to snow accumulation, easy to drain and below a snow line, a snow-proof shed hole is arranged at the hole opening, the portal foundation is arranged below the freezing depth and is not less than 0.25m, and the hole opening side slope protection grade is enhanced by one grade or the slope rate is slowed down by one grade compared with the conventional protection.
The lining structure design should consider the influence of frost heaving and thaw sinking in addition to satisfying conventional design, and determine the lining structure and size through engineering analogy.
The cold area adopts the heat preservation ditch, and severe cold area adopts deep-buried ditch or winter protection sluicehole, and vertical wall back of the body drain pipe and the horizontal drain pipe etc. of road surface below all need to adopt insulation material to wrap up.
And (3) further verifying whether the air temperature in the tunnel is consistent with that calculated in the design stage within three years, and correcting the lengths or the thicknesses of the lining and the ditch heat-insulating layer in time if the actually measured length of the section to be heat-insulated is larger than the implemented length or the temperature is lower than the calculated temperature.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A reconnaissance design method for seasonal frozen soil highway tunnels is characterized by comprising the following steps:
the first step is as follows: establishing a miniature meteorological observation value in a proposed tunnel site area, and collecting meteorological data of the tunnel site area;
the second step is that: surveying, collecting surface water distribution, underground water level and variation range, collecting the freezing depth and underground water distribution condition of a tunnel site area, and predicting the maximum water inflow of each section of the tunnel along the way, besides conventional engineering geology and hydrogeology collection;
the third step: determining the inner contour of the tunnel, calculating the distribution condition of the air temperature in the tunnel along the way, and determining the length of the heat preservation section of the tunnel by taking 0 ℃ as a boundary;
the fourth step: designing a hole opening and a hole door, calculating frost heaving force, determining lining parameters, and determining the thicknesses of a tunnel lining and a ditch heat-insulating layer;
the fifth step: the design of water prevention and drainage, namely, the heat insulation design of a tunnel water prevention and drainage system is required at the heat insulation section of the tunnel;
and a sixth step: and after the tunnel is communicated, verifying whether the temperature in the tunnel is consistent with the temperature in the design stage, and correcting the thicknesses of the lining and the ditch heat-insulating layer in time.
2. The reconnaissance design method of a seasonal frozen soil highway tunnel according to claim 1, wherein a microclimate observation value is established in a proposed tunnel site area, and the microclimate observation value is set at an entrance and an exit of the tunnel respectively to collect meteorological data of the tunnel site area.
3. The survey design method for the seasonal frozen soil road tunnel according to claim 1, wherein the collecting of meteorological data comprises collecting a coldest month average air temperature at the tunnel entrance, a maximum freezing depth, an annual average tracheal oxygen partial pressure at the tunnel entrance, and a winter wind direction and a wind speed.
4. The reconnaissance design method for a seasonal frozen soil road tunnel according to claim 1, wherein the average temperature of the coldest month at the opening is used for judging the degree of coldness, and the average temperature of the coldest month is less than or equal to-10 ℃ and is a severe cold region, and the average temperature of the coldest month is less than-10 ℃ and is less than 0 ℃ and is a cold region; wherein, the severe cold area and the cold area need to be designed for heat preservation.
5. The survey design method for the seasonal frozen soil road tunnel according to claim 1, wherein the survey is performed by means of data, engineering geological mapping, hydrogeological mapping, geophysical prospecting, drilling, field testing or indoor testing, and the tunnel water inflow and water temperature are definitely extracted for the tunnel section in the survey stage. The water quantity and the water temperature are very important for whether the freezing damage of the tunnel occurs in winter.
6. The reconnaissance design method of the seasonal frozen soil highway tunnel according to claim 1, wherein an inner contour of the seasonal frozen soil tunnel meets the requirements of a conventional tunnel, and is further provided with a heat-insulating and anti-freezing layer, and the inner contour of the frozen soil tunnel is generally increased by 5-15 cm.
7. The reconnaissance design method of a seasonal frozen soil road tunnel according to claim 1, wherein the opening is selected to be exposed to the sun, not prone to snow accumulation, easy to drain and below a snow line, a snow-proof shed is preferably arranged at the opening, a portal foundation is arranged below a freezing depth of not less than 0.25m, and the slope protection grade of the opening is enhanced by one grade or the slope rate is slowed down by one grade compared with the conventional protection.
8. The reconnaissance design of seasonal frozen earth highway tunnel of claim 1The method is characterized in that the lining structure design meets the conventional design, the influence of frost heaving and thaw collapse is considered, the lining structure and the size are determined through engineering analogy, and the calculation formula is as follows: y is 91.6(-x)0.863
Wherein x is the temperature of the opening (calculation temperature, negative value, wherein the calculation temperature value rule is as follows, the average temperature in the lowest month is taken for cold regions and is reduced by 10 ℃, and the average temperature in the lowest month is taken for severe cold regions and is reduced by 15 ℃).
9. The reconnaissance design method of a seasonal frozen earth road tunnel according to claim 1, wherein a thermal insulation ditch is adopted in a cold area, a deep-buried ditch or a cold-proof drainage tunnel is adopted in a severe cold area, and a longitudinal wall back drainage pipe, a transverse drainage pipe below a road surface and the like are wrapped by thermal insulation materials.
10. The reconnaissance design method of a seasonal frozen earth road tunnel according to claim 1, wherein it is further verified whether the air temperature in the tunnel is consistent with that calculated in the design stage within three years, and if the actually measured length of the section to be insulated is larger than the implemented length or the temperature is lower than the calculated temperature, the length or thickness of the lining and ditch insulation is corrected in time.
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| 乞力马扎罗: "《多年冻土区 公路隧道技术规范》", 18 October 2019 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116357335A (en) * | 2023-04-03 | 2023-06-30 | 交通运输部公路科学研究所 | Safety control method for tunnel structure in cold region |
| CN116357335B (en) * | 2023-04-03 | 2023-11-21 | 交通运输部公路科学研究所 | Safety control method for tunnel structure in cold region |
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Application publication date: 20201110 |