CN210561950U - Overflow structure for preventing lake burst in permafrost region - Google Patents
Overflow structure for preventing lake burst in permafrost region Download PDFInfo
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- CN210561950U CN210561950U CN201920972836.6U CN201920972836U CN210561950U CN 210561950 U CN210561950 U CN 210561950U CN 201920972836 U CN201920972836 U CN 201920972836U CN 210561950 U CN210561950 U CN 210561950U
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Abstract
The utility model relates to an overflow structure for preventing burst of lakes in permafrost region, which comprises a water retaining bank (1) arranged at both sides of an overflow port and a buried dark culvert diversion structure arranged at the overflow port, wherein the water retaining bank comprises a filling layer (6) and a stone block layer (7) laid on the upper surface of the filling layer; the buried blind culvert diversion structure comprises a replacement and filling layer (2), a heat preservation layer (3) and a plurality of corrugated culvert pipes (4), wherein the replacement and filling material of the replacement and filling layer is frost heaving insensitive coarse-grained soil material, and the bottom surface of the replacement and filling layer is 1.5-2 m below the permafrost upper limit. The water retaining bank structure can lift the upper limit of permafrost at the lower part, and the position and the range of the lake overflow are effectively controlled by utilizing the impermeability of the permafrost; the buried dark culvert flow guide structure can effectively reduce the thermal erosion of the overflow water body to the frozen soil at the lower part for many years, and prevent the instability and the structural failure of the overflow structure foundation. The utility model discloses an use can effectively guarantee the long-term stability and the effectiveness of overflow structure, realize the orderly controllable of permafrost region lake and leak, prevent that the lake from bursting.
Description
Technical Field
The utility model relates to a frozen soil area hydraulic engineering technical field especially relates to an overflow structure that perennial frozen soil area prevents lake burst.
Background
Research and monitoring show that rainfall in permafrost regions of Qinghai-Tibet plateau is increased remarkably along with climate warming in recent years. Under the background of climate warming and rainfall increasing, the area and water amount of lakes in permafrost areas are continuously increased, and the risk of burst overflow exists. Taking the cocoa west region as an example, the large piece of frozen soil develops continuously for many years, the climate shows a warm and humid trend in recent 50 years, and the climate is more obvious in 2000. Due to the influence of the warming and humidifying process, the area of the lake in the area and the water quantity are continuously increased, and the risk of burst overflow exists, for example, a burst event of the lake (Zhuoping lake) occurs in 2011 and 9 months. In permafrost areas, after the lake burst, the retreat of the lake surface and the exposure of the lake bottom can cause a series of ecological environment problems. Meanwhile, free flood discharge can cause serious thermal erosion to permafrost in a flood channel, cause surface subsidence and seriously threaten engineering structures along the flood channel.
Unlike conventional melting soil, the strength of permafrost is closely related to the temperature conditions. In the prior art, the concrete overflow structure has hydration heat problem in the construction process, and can cause remarkable thermal disturbance to surrounding permafrost, thereby causing the instability of the overflow structure foundation and structural failure. Meanwhile, under the condition of long-term water passing, the constant flow water carrying heat can generate continuous thermal erosion on the permafrost under the conventional overflow structure, so that the permafrost is heated and melted and has strength loss, and the instability and structural failure of the overflow structure can be caused.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that an overflow structure that permafrost region prevented lake burst is provided to overcome among the prior art concrete hydration heat and the short-term and long-term hot erosion that the permafrost caused to conventional water conservancy diversion structure underlying of overflow water body, and then caused the technical problem of water conservancy diversion structure basis unstability and structural failure.
In order to solve the above problem, a permafrost region prevents overflow structure that lake bursts, include: the water retaining bank is arranged at two sides of the overflow port, and the buried dark culvert diversion structure is arranged at the overflow port, and the two are in a state of high two sides and low middle part; the water retaining bank comprises a filling layer and a stone layer paved on the upper surface of the filling layer; the buried blind culvert flow guide structure comprises a filling layer, a heat insulation layer and a plurality of corrugated culverts arranged along the overflow direction, wherein the filling layer is arranged from bottom to top, the filling material of the filling layer is frost heaving insensitive coarse-grained soil material, and the bottom surface of the filling layer is 1.5-2 m below the upper limit of perennial frozen soil.
Preferably, the buried dark culvert diversion structure further comprises a steel bar block gabion layer arranged on the upper portion of the corrugated pipe culvert, the thickness of the steel bar block gabion layer is 0.5-0.8 m, and the grain size of the stone is 20-30 cm.
Preferably, the length of the water retaining bank is not less than 20m, the thickness of the soil filling layer is not less than 2.5m, the width of the top is 1.5 m-2.0 m, and the slope is released from the top according to the ratio of 1: 1.2-1.5.
Preferably, the filler of the filling layer is frost heaving insensitive coarse-grained soil.
Preferably, the thickness of the block stone layer is 0.5-0.8 m, and the grain size of the stone material is 6-20 cm.
Preferably, the heat-insulating layer is wrapped around the corrugated pipe culvert.
Preferably, the corrugated pipe is a metal corrugated pipe for culvert, the thickness is 2 mm-8 mm, and the diameter is 0.5 m-1 m.
Compared with the prior art, the utility model has the following advantage:
1. the utility model discloses in, the manger plate low bank note is established in overflow mouth both sides, including filling out soil and covering the lump stone, (1) in cold season, cover the heat convection process that the lump stone utilized low temperature air and increase the heat dissipation of the permafrost of lower part, (2) in warm season, fill out soil and cover the heat absorption of the reducible lower part permafrost of lump stone self thermal resistance. Therefore, the water retaining bank can obviously lift the upper limit of the permafrost at the lower part after construction, and the position and the range of the lake overflow are effectively controlled by utilizing the water impermeability of the permafrost and the water retaining bank.
2. The utility model discloses a buried dark culvert diversion structure includes a filling and replacement layer, a heat preservation layer and a series of corrugated culvert, (1) the filling and replacement layer can enhance the basic bearing capacity of the overflow structure, effectively reduce frost heaving and thaw deformation; (2) the heat-insulating layer can effectively isolate the heat exchange between the overflow water body and the permafrost on the lower part, and maintain the thermal condition of the permafrost on the lower part of the structure under the water passing condition, so that the long-term stability and effectiveness of the overflow structure are ensured; (3) the controllable of overflow water body leaks can be realized to the bellows culvert, has avoided the heat disturbance of hydration heat to many years frozen soil on every side simultaneously in conventional concrete water conservancy diversion structure work progress, compares in other prefabricated pipe culverts (like the concrete pipe culvert) moreover, and the bellows culvert has characteristics such as light in weight, durability are good, and more importantly the bellows culvert is inseparable with the soil body contact on every side, and the adaptation basis deformability is strong under the circulation freeze thawing effect, therefore long-term stability is good.
To sum up, under the combined action of manger plate low bank and burying secret culvert water conservancy diversion structure, the utility model discloses an use can effectively control the position that perennial frozen soil area lake overflows and overflow structure's long-term stability and effective, avoid the overflow water to the long-term hot erosion of the perennial frozen soil of lower part, realize the orderly controllable of lake water and leak, prevent that the lake from bursting.
3. The utility model discloses further including establishing the reinforcing bar piece gabion layer on corrugated pipe culvert upper portion, it can prevent that heavy rainfall or other factors from leading to the emergence that lower part heat preservation and corrugated pipe culvert layer were destroyed by the overflow water under the overflow water increases the condition suddenly that it reduces the damage on ice pushing effect part heat preservation and corrugated pipe culvert layer winter simultaneously, further strengthens the overall stability of overflow structure.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of an overflow structure provided in an embodiment of the present invention.
Fig. 2 is a schematic cross-sectional view of a water bank in an overflow structure according to an embodiment of the present invention.
Fig. 3 is another schematic cross-sectional view of the water bank in the overflow structure according to the embodiment of the present invention.
In the figure: 1-water retaining bank, 2-filling layer, 3-heat insulation layer, 4-corrugated pipe culvert, 5-overflow port surface layer filling soil, 6-filling soil layer, 7-stone layer and 8-reinforcing steel bar block gabion layer.
Detailed Description
Referring to fig. 1-2, an embodiment of the present invention provides an overflow structure for preventing burst in a lake in a permafrost region, which mainly includes a water-retaining bank 1 disposed at both sides of an overflow port and a buried dark culvert diversion structure disposed at the overflow port, both of which are in a state of high both sides and low middle; it can be understood that the buried hidden culvert flow guide structure is arranged below the earth filling 5 on the surface layer of the overflow port, and the flowing water overflows outwards from the corrugated pipe culvert 4 in the buried hidden culvert flow guide structure.
The water retaining bank 1 comprises a soil filling layer 6 and a stone block layer 7 paved on the upper surface of the soil filling layer 6. The height of the filling layer 6 is determined according to the landforms on two sides of the overflow port, the height is not less than 2.5m, the width of the top is 1.5 m-2.0 m, and the filling layer is set to be sloping from the top according to the ratio of 1: 1.2-1.5, so that the stability is ensured. The thickness of the block stone layer 7 is 0.5 m-0.8 m, the stone is broken stone or block stone, and the grain size is 6 cm-20 cm. The length of the water retaining bank 1 is determined according to the local terrain, and both sides of the overflow port are not required to be less than 20 m.
Buried dark culvert diversion structure is including trading and filling layer 2, heat preservation 3 and corrugated pipe culvert 4, trades and fills layer 2 and is located heat preservation 3 and corrugated pipe culvert 4 below, and corrugated pipe culvert 4 bottom and the top of trading and filling layer 2 are equipped with heat preservation 3. In order to further enhance the stability of the buried dark culvert diversion structure, the buried dark culvert diversion structure can further comprise a steel bar block gabion layer 8 arranged on the upper part of the corrugated pipe culvert 4. The reinforcing steel block gabion layers 8 are arranged side by side along the overflow direction, the width and the length of the reinforcing steel block gabion layers are the same as the length of the corrugated pipe culvert, the thickness of the reinforcing steel block gabion layers is 0.5-0.8 m, and the particle size of the stone is 20-30 cm.
The filling material of the filling layer 2 is frost heaving insensitive coarse-grained soil material, the thickness is determined according to the upper limit of permafrost on the lower part of the overflow port, and the filling material is required to be filled from the lower part of the heat-insulating layer 3 to the lower part of the upper limit of the permafrost by 1.5-2 m. Such materials and setting mode can effectively reduce frost heaving, melt and sink deformation, and strengthen the basic bearing capacity and the stability of the overflow structure. Similarly, the filling of the overflow port surface layer filling 5 and the filling of the filling layer 6 in the water retaining bank 1 can also adopt frost heaving insensitive coarse-grained soil, so that the stability of the whole overflow structure is further improved.
The heat preservation layer 3 can be wrapped around the corrugated pipe culvert 4 as shown in the figure, and can also be arranged at the bottom of the corrugated pipe culvert 4 and the top of the filling layer 2, but the former is better from the heat preservation and heat insulation effect. The width of the heat preservation layer 3 is determined according to the number and the diameter of the corrugated pipe culverts 4, and the length of the heat preservation layer is the same as that of the corrugated pipe culverts 4. In practical application, the heat-insulating layer 3 can be made of XPS heat-insulating material, and the heat conductivity coefficient is not more than 0.03W.m-1.K-1And the thickness is 10cm to 15 cm.
The plurality of corrugated pipe culverts 4 are arranged side by side along the overflow direction, the diameter and the number are determined according to the overflow flow of the lake on the basis of considering the topography of the overflow port, and the length is determined according to the topography of the overflow port and the distance from the overflow port to the downstream river (flood) channel. In practical application, the corrugated pipe culvert 4 is a metal corrugated pipe for culvert, the material is Q235 or SS400 hot-rolled steel plate, the thickness is 2mm to 8mm, and the diameter of the pipe culvert is 0.5m to 1 m.
Based on the above disclosure, in the actual construction process of the overflow structure, the heat insulation layer 3 and the corrugated pipe culvert 4 are prefabricated in a factory and spliced on site, so that the site construction cost is saved.
The utility model relates to a part material is common ordinary geotechnological material, and the cost is low, and the work procedure is few, and later maintenance is simple. The whole structure is quick and light in construction, less in required manpower and machinery, and small in disturbance to surrounding permafrost in the construction process.
The technical scheme provided by the utility model is introduced in detail above. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the structure and core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.
Claims (7)
1. An overflow structure for preventing burst of lakes in permafrost regions, comprising:
the water retaining bank (1) is arranged at two sides of the overflow port, and the buried dark culvert diversion structure is arranged at the overflow port, and the two are in a state of high two sides and low middle part;
the water retaining low bank (1) comprises a filling layer (6) and a stone block layer (7) paved on the upper surface of the filling layer (6);
the buried blind culvert flow guide structure comprises a filling layer (2) arranged from bottom to top, a heat preservation layer (3) and a plurality of corrugated culverts (4) arranged along the overflow direction, wherein filling materials of the filling layer (2) are frost heaving insensitive coarse-grained soil materials, and the bottom surface of the filling layer is 1.5-2 m below the upper limit of perennial frozen soil.
2. The overflow structure of claim 1, wherein the buried culvert diversion structure further comprises a reinforcement block gabion layer (8) arranged on the upper part of the corrugated culvert (4), the thickness of the reinforcement block gabion layer is 0.5-0.8 m, and the grain size of stone used is 20-30 cm.
3. The overflow structure of claim 1, wherein the length of the water retaining dam (1) is not less than 20m, the thickness of the fill (6) is not less than 2.5m, the top width is 1.5 m-2.0 m, and the fill is pitched at a ratio of 1: 1.2-1.5 from the top.
4. An overflow construction according to claim 1, characterised in that the filling of the filling layer (6) is frost heave insensitive coarse grained earth.
5. An overflow construction as claimed in claim 1, characterised in that the thickness of the block stone layer (7) is 0.5-0.8 m and the grain size of the stone used is 6-20 cm.
6. An overflow structure according to claim 1, characterised in that the insulating layer (3) is wrapped around the corrugated culvert (4).
7. An overflow structure as claimed in claim 1, wherein the corrugated culvert (4) is a metal corrugated culvert having a thickness of 2mm to 8mm and a diameter of 0.5m to 1 m.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920972836.6U CN210561950U (en) | 2019-06-26 | 2019-06-26 | Overflow structure for preventing lake burst in permafrost region |
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| CN201920972836.6U CN210561950U (en) | 2019-06-26 | 2019-06-26 | Overflow structure for preventing lake burst in permafrost region |
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| CN210561950U true CN210561950U (en) | 2020-05-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110295571A (en) * | 2019-06-26 | 2019-10-01 | 中国科学院寒区旱区环境与工程研究所 | A kind of Permafrost Area prevents the flow structure that lake is burst |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110295571A (en) * | 2019-06-26 | 2019-10-01 | 中国科学院寒区旱区环境与工程研究所 | A kind of Permafrost Area prevents the flow structure that lake is burst |
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Effective date of registration: 20201015 Address after: 730000 No.318, Donggang West Road, Chengguan District, Lanzhou City, Gansu Province Patentee after: NORTHWEST INSTITUTE OF ECO-ENVIRONMENT AND RESOURCES, CAS Address before: 730000 Gansu city of Lanzhou province Donggang West Road No. 320 Patentee before: Institute of environment and Engineering in cold and dry areas, Chinese Academy of Sciences |