CN103388312A - Triangular sand control dam applied to prevention and treatment of sandstorm - Google Patents
Triangular sand control dam applied to prevention and treatment of sandstorm Download PDFInfo
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- CN103388312A CN103388312A CN2012101404179A CN201210140417A CN103388312A CN 103388312 A CN103388312 A CN 103388312A CN 2012101404179 A CN2012101404179 A CN 2012101404179A CN 201210140417 A CN201210140417 A CN 201210140417A CN 103388312 A CN103388312 A CN 103388312A
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Abstract
The invention relates to a triangular sand control dam applied to prevention and treatment of sandstorm. The triangular sand control dam is arranged in windward direction of an object to be protected, the section of a dam body is in shape of an isosceles triangle with an inclination angle of 40 degrees, the height H of the dam body is 6.0-7.5m, the length L of the dam body is equal to the length S of the object to be protected, and the maximum space between the object to be protected and the sand control dam is the 17 times the height of the sand control dam. The invention provides a new type of a sand control engineering which can block wind-drift sand at a windward slope and can also form a large-range effective protective distance on the leeward side. The triangular sand control dam disclosed by the invention is already applied to the prevention and treatment of sandstorm at a second double-line Yumen section of Lanxin and obtains excellent sand control effect. Based on the practice, the triangular sand control dam with the inclination angle of 40 degrees exerts the excellent sand control effect and provides successful experience and theoretical direction for the prevention and the treatment of the sandstorm in gravel gobi, the maintenance of transport lines and the protection of important cultural objects and historic monuments and economic facilities in China.
Description
Technical field
The invention belongs to dust storm Prevention Technique field, specifically a kind of sand preventing dyke blocks the triangle sand preventing dyke with the transporting stream.
Background technology
Along with national economy continues, stable, high speed development, country has strengthened the dynamics to development of the West Regions, and the development level of communications and transportation becomes the key factor that promotes regional development.Lanzhou-Xinjiang the second double line is the major part of overpass passage in country " eight horizontal eight is vertical " railway network main framing, to greatly shorten the space-time distance of the Northwest and the central and east and southwest after building up, significant to the Transportation Organization efficiency, drive Regional Economic Development and the raising people's living standard that improve operation enterprise.But the rail track span is large, and institute is complicated through part natural region amblent air temperature, and natural calamity takes place frequently.The stream of Hexi Corridor section is to one of railway operation harm to the erosion of roadbed and car body.It is the principal element of the husky district's road construction of puzzlement China and safe operation.The application of therefore, sand prevention new technology, new material and new technology is one of important subject of dust storm engineering science.
Summary of the invention
, for Hexi Corridor Gobi Region hazards of sand storms rule and geomorphological environment condition, the invention provides a kind of triangle sand preventing dyke for the dust storm control.In order to confirm the validity of triangle sand preventing dyke, the present invention has carried out the field monitoring of sand prevention effect and wind tunnel experiment, FLUENT numerical simulation study, inquire into its sand prevention mechanism, thereby provide the theory and practice foundation for optimum design of structuresprogram and the application thereof of triangle sand preventing dyke.
The objective of the invention is to realize by following measures:
A kind of triangle sand preventing dyke for the dust storm control, it is arranged in by the upwind of fender, it is characterized in that the levee body section is the isosceles triangle at 40 °, inclination angle, the levee body height H is 6.0-7.5m, the long L of levee body is with suitable by fender body length S, and the maximum spacing that is protected object and triangle sand preventing dyke is 17 times of sand preventing dyke height.
The beneficial effect of advantage of the present invention and generation is:
1, sand preventing dyke have the natural cause of being subjected to as a kind of Novel sand-proof technology restriction less, the firm advantage such as survivable, constructability of levee body, can reach comparatively ideal protection effect.Especially be difficult to carry out in high and cold and arid area biological protection measure, perhaps other engineering measures such as the husky fence of resistance, high-vertical great-grid sand-blocking sand-fixing barrier are easily in the situation that high wind is destroyed, and building sand preventing dyke is best selection.Above advantage makes in its control of sandstorm in industries such as industrial and mineral, traffic and cultural relics and historic sites and is with a wide range of applications.
2, the design of the present invention feature and the geomorphological environment condition that are based on Hexi Corridor Gobi Region stream produces.Gobi Region is smooth open, and grit is abundant, the precondition of providing convenience for the build of sand preventing dyke; The maximum spacing of levee body and quilt protection object is no more than 17 times of levee body height; be that effective wind speed weakens district in this spacing scope, and wind speed is in the interior still recovery fully of this distance, for set up one barrier by fender; avoided the sand of leeward side, made by fender and be protected.
3, the present invention suits measures to local conditions, gathers materials on the spot, and traffic route is protected the spoir in the time of can selecting road performance and abandoned stone, and Gobi desert and drift sand area utilize excavates the material build sand preventing dyke that cuts sand furrow, can be at the larger effective protection distance of leeward side formation.For the control of grit matter Gobi windy sand flow with safeguard China traffic route, the protection of important cultural relics and historic sites and economic facility provides successful experience.
4, result of study of the present invention shows, inclination angle is that 40 ° of triangle sand preventing dykes are all formed maximum effective protection distance to protecting object under all kinds of wind speed, make the harm of being avoided stream by fender, for the control of grit matter Gobi windy sand flow provides successful experience.
Description of drawings
Fig. 1 is schematic diagram of the present invention.
Fig. 2 is open-air sand preventing dyke flow field figure.
Fig. 3 is triangle sand preventing dyke flow field figure under the 8m/s wind speed.
Fig. 4 is triangle sand preventing dyke flow field figure under the 10m/s wind speed.
Fig. 5 is triangle sand preventing dyke flow field figure under the 12m/s wind speed.
Fig. 6 is triangle sand preventing dyke flow field figure under the 16m/s wind speed.
Fig. 7 is the flow field structure graphics of different angle triangle sand preventing dyke.
The specific embodiment
Below in conjunction with accompanying drawing, technical solution of the present invention is further described again:
The Hexi Corridor sandstorm is serious, fails effectively to stop for many years the harm of drift sand always., for guaranteeing the smooth and easy operation of traffic route in this zone, avoid hazards of sand storms, the triangle sand preventing dyke of a kind of dust storm control of the invention process.
As shown in Figure 1, a kind of triangle sand preventing dyke for the dust storm control, it is arranged in by the upwind of fender, it is characterized in that the levee body section is the isosceles triangle 1 at 40 °, inclination angle, the levee body height H is 6.0-7.5m, the long L of levee body is with suitable by protection object 2 length S, and the maximum spacing that is protected object 2 and triangle sand preventing dyke 1 is 17 times of sand preventing dyke height.
Should, according to hazards of sand storms rule and the geomorphologic characteristics of locality, rationally adjust spacing at actual arrangement process intermediate cam shape sand preventing dyke.
In order to verify the feasibility of triangle sand preventing dyke, the present invention is from field monitoring and wind tunnel simulation experiment, numerical simulation three aspects:, we have studied inclination angle is that the triangle sand preventing dyke of 40 ° is avoided the effect of hazards of sand storms in protection Hexi Corridor Region traffic route, and the protection benefit of itself and other types sand preventing dyke is compared, reach a conclusion.
The field monitoring of 1 triangle sand preventing dyke protection benefit
1.1 observation procedure
The traffic route, Hexi Corridor is subjected to sandstorm serious, for many years, fails effectively to stop the harm of drift sand always.Chinese Academy of Sciences cold area arid region environment and Engineering research institute and Gansu great municipal and environment-friendly engineering of a specified duration Co., Ltd, excavate and piled up the triangle sand preventing dyke near Lanzhou-Xinjiang the second double line DK886+800 ~ DK891+800 section (40 ° 21 ' 10 " N; 96 ° 55 ' 44.9 " is E) cooperation, select one group of typical triangle sand preventing dyke to observe: the sand preventing dyke main body is high 6.8 meters, the leeward slope inclination angle is 45 °, half length of grade is 9.5 meters windward, the windward slope inclination angle is 40 °, 8 meters of lengths of grade, sand preventing dyke moves towards N40 ° of W, and is parallel with Lanzhou-Xinjiang the second double line roadbed.
The DETI mobile portable gradient wind measuring station of Changchun meteorologic instrument Research Institute is adopted in open-air wind speed and direction observation, carries out field wind flow field observation.This measuring station is comprised of seven cover subsystems, can determine the wind direction and the wind speed of 5 height, and the measuring wind speed scope is 0.8-30ms
-1, resolution ratio is 0.1 ms
-1, the wind direction resolving power is 5.625 °, automatic data collection, storage.
1.2 monitoring result
Find out in conjunction with field inspection data and flow field figure 2: wind speed low value district appears in sand preventing dyke windward slope toe place, and this is the loss area of energy to have occurred because air-flow chance sand preventing dyke is obstructed.The air-flow lifting that is hampered, little along speedup in the crawling process of slope, generally be not more than 1.1 times of control point, in the process of climbing, the near surface air-flow is subjected to the frictional force function influence, and wind speed changes greatly, and at windward slope 1/3 place, 23cm height wind speed ratio reaches 1.28 times of control point; And at windward slope 2/3 place, 23cm and 50cm height wind speed ratio are all less than the control point wind speed; Highly wind speed is less than the corresponding wind speed in windward slope 1/3 place except 23cm to levee crown, and other height wind speed all reaches maximum.Affected by frictional force away from the earth's surface air-flow little, wind speed changes little.Can find also that from flow field figure 2 near surface wind speed equivalence line is not parallel to windward slope always and rises to levee crown, and at levee body windward slope 2/3 place, a doab occur.Obvious afflux accelerating region has been formed on the sand preventing dyke top, and it is maximum that the air speed value of five height of measuring staff all reaches.
Weak wind district appears in the levee body leeward side, and the wind speed major part is less than the wind speed of control point, and the leeward side turbulent flow is grown vigorous, and air-flow, in levee crown section, the energy subregion occurs, and in flow field figure 2, the wind speed equivalence line of leeward side raises up to local sedimentation far away.
The wind tunnel simulation experiment of 2 triangle sand preventing dyke protection benefits
2. 1 experiment content and method
, according to the needs of sediment control structure, carry out emphatically the simulated experiment of different angle triangle sand preventing dyke protection benefit.The present invention has made and highly has been 8cm, side slope inclination angle and is respectively the isosceles triangle model of 10 °, 20 °, 30 °, 40 ° and 45 ° with wooden three-ply board, the experiment of comparing, and it is 1m that model length is suitable for the wind-tunnel cross-sectional width.Wind speed choose 8,10,12 and four groups of 16m/s compare observation.
2.2 experimental result and discussion
Under 8m/s group wind speed, the toe low regime is dwindled with the increase scope at inclination angle windward, but barometric gradient becomes large, and it is intensive that isopleth becomes.The low regime of the toe windward scope of 10 ° and the 30 ° sand preventing dykes in inclination angle is-7H, and 20 ° of inclination angle sand preventing dykes are-9H, 40 ° and 45 ° of sand preventing dyke scopes reduce to-6H and-5H.Each angle sand preventing dyke afflux accelerating region height is all at the 11cm place, but along with angle increases the barometric gradient increase, it is intensive that isopleth becomes.Deceleration decanting zone scope increases and to become large with angle, and 10 ° of sand preventing dykes are without obvious deceleration decanting zone, 20 °, 30 ° sand preventing dykes be respectively 12H and 14.5H, be increased to 20H and 17.7H to 40 ° and 45 ° of sand preventing dykes.Wind speed null value district scope also increases and to enlarge with angle: 10 ° of sand preventing dykes are without obvious null value district, and 20 ° and 30 ° of sand preventing dyke null value districts are respectively 5.5H and 7H, and 40 ° and 45 ° of sand preventing dykes increase to 8H (as Fig. 3).
Under 10m/s group wind speed, toe low regime scope increases and reduces with inclination angle windward, and 10 ° of inclination angle sand preventing dykes are without obvious low regime, 20 ° and 30 ° of sand preventing dykes be respectively-8.5H and-7H, 40 ° and 45 ° of sand preventing dykes drop to respectively-6H and-4.5H.10 ° of sand preventing dykes are without obvious afflux accelerating region, and the afflux accelerating region height of other angle sand preventing dykes is 11cm.The scope of leeward side deceleration decanting zone increases and enlarges with angle, and 10 ° of sand preventing dykes are 8H, and 40 ° of sand preventing dykes reach ultimate range 20H, and wind speed null value district presents same rule, and 20 ° of sand preventing dykes are 5.5H, to 40 ° of sand preventing dykes, reach maximum value 8H(such as Fig. 4).
Under 12m/s group wind speed, toe low regime scope increases and reduces with wind speed windward, and 20 ° of sand preventing dykes be-8H, and 40 ° and 45 ° of sand preventing dykes all reduce to-5H and-4.5H.Afflux accelerating region height is except 10 ° of sand preventing dykes, and other angle sand preventing dykes are 11cm.Leeward side deceleration decanting zone scope increases and enlarges with angle, and 10 ° of sand preventing dykes are 8H, and 40 ° of sand preventing dykes reach maximum 20H.Wind speed null value district is same rule, and 20 ° of sand preventing dykes are 5H, and 40 ° of sand preventing dykes reach maximum value 8H(such as Fig. 5).
Under 16m/s, 20 ° of sand preventing dykes toe low regime windward are-8H, 40 ° and 45 ° of sand preventing dykes reduce to-5H and-4H.The afflux accelerating region except 10 ° of sand preventing dykes highly all at the 11cm place.The deceleration decanting zone increases and to enlarge with angle, and 10 ° of sand preventing dykes are 7H, and 40 ° of sand preventing dykes reach maximum value 17.5H, and wind speed null value district presents same rule, and 20 ° of sand preventing dykes are 5H, to 40 ° of sand preventing dykes expand 8H(such as Fig. 6 to).
In sum, the effective protection distance scope that the triangle sand preventing dyke forms enlarges with the increase at windward slope inclination angle, and the maximum effective protection distance 40 ° of sand preventing dykes all reach all sand preventing dykes under each group wind speed in, realize optimal protective effect.Under the 8m/s wind speed, the 20H from the effective protection distance 8H of 10 ° of inclination angle sand preventing dykes formation is increased to 40 ° of inclination angle sand preventing dykes, reduce to 17.7H to 45 ° of sand preventing dykes; 10m/s than the effective protection distance that forms under the 8m/s wind speed without significant change; Under the 12m/s wind speed, the 20H from the effective protection distance 8H of 10 ° of inclination angle sand preventing dykes formation is increased to 40 ° of inclination angle sand preventing dykes, reduce to 16H to 45 ° of sand preventing dykes; Under the 16m/s wind speed, the 17.5H from the effective protection distance 7H of 10 ° of inclination angle sand preventing dykes formation is increased to 40 ° of inclination angle sand preventing dykes, reduce to 16H to 45 ° of sand preventing dykes.The low regime of toe windward that the triangle sand preventing dyke forms increases and presents the trend of dwindling with inclination angle, and each is organized the lower 20 ° of inclination angle sand preventing dykes of wind speed and all reaches maximum, and 45 ° of sand preventing dykes are minimum.The effective protection distance that mainly utilizes the triangle sand preventing dyke to form in protection process, consider 40 ° of inclination angle sand preventing dyke best results of integrated protection benefit.
The FLUENT Numerical Experiment of 3 triangle sand preventing dyke protection benefits
3. 1 experiment content and method
Utilize FLUENT software to carry out numerical simulation calculation to the Fluid Flow in A situation around the different angle sand preventing dyke.At first utilize GAMBIT to carry out the generation of structure, boundary types and the grid of flow region geometry, the form that output can be calculated by the FLUENT solver, produce respectively the isosceles triangle sand preventing dyke model at 20 °, 30 °, 40 ° and 45 ° inclination angles.Then apply FLUENT solver flow zone and solve calculating, utilize finally TECPLOT software to carry out post processing to the result of calculation of FLUENT output.
3.2 experimental result and discussion
Wind tunnel experiment can only be drawn the Flow Field Distribution of the body central authorities that appear, and by the fluent numerical simulation, can observe the flow field structure of whole hole body.The leeward side wind speed of sand preventing dyke central part reduces maximum, and the backflow of formation is also maximum.As can be seen from Figure 7 inclination angle is 40 ° and 45 ° of sand preventing dykes than the sand preventing dyke of 20 ° and 30 °, and leeward side has formed larger recirculating zone, wind speed null value district and effective protection distance, and the conclusion that this and wind tunnel experiment draw is similar.
In sum, the maximum effective protection distance 40 ° of sand preventing dykes all reach all sand preventing dykes under each group wind speed in, the effective protection distance that mainly utilizes the triangle sand preventing dyke to form in protection process, consider 40 ° of inclination angle sand preventing dyke best results of integrated protection benefit.
Claims (1)
1. one kind is used for the triangle sand preventing dyke that dust storm is prevented and treated, it is arranged in by the upwind of fender, it is characterized in that the levee body section is the isosceles triangle (1) at 40 °, inclination angle, the levee body height H is 6.0-7.5m, the long L of levee body is with suitable by protection object (2) length S, and the maximum spacing that is protected object (2) and triangle sand preventing dyke (1) is 17 times of sand preventing dyke height.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111074801A (en) * | 2019-12-31 | 2020-04-28 | 上海电气集团股份有限公司 | Sand blocking fence accumulated sand cleaning method, sand guiding embankment structure and wind sand protection system |
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2012
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| JPH01250507A (en) * | 1988-03-31 | 1989-10-05 | Nippon Parts Center:Kk | Dust-proof, sand-proof, and snow-proof device at storing place of coal or the like |
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Non-Patent Citations (1)
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Cited By (1)
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| CN111074801A (en) * | 2019-12-31 | 2020-04-28 | 上海电气集团股份有限公司 | Sand blocking fence accumulated sand cleaning method, sand guiding embankment structure and wind sand protection system |
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Application publication date: 20131113 |