CN108166435A - Grid dam viscous mud-flow of blocking occludes critical comprehensive judging method - Google Patents
Grid dam viscous mud-flow of blocking occludes critical comprehensive judging method Download PDFInfo
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- CN108166435A CN108166435A CN201810050516.5A CN201810050516A CN108166435A CN 108166435 A CN108166435 A CN 108166435A CN 201810050516 A CN201810050516 A CN 201810050516A CN 108166435 A CN108166435 A CN 108166435A
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Abstract
A kind of grid dam viscous mud-flow of blocking occludes critical comprehensive judging method, including：The unit weight γ of mud-rock flow is determined by field investigationc, unit kN/m3, determine mud-rock flow wholegrain diameter grading curve so as to obtain characteristic diameter d by field sampling95Value, unit m；The longitudinal slope tan θ of in-site measurement raceway groove choose grid dam opening the spacing b, unit m of actual measurement or design；Root formula calculation grid dam occludes critical comprehensive criterion F；If F≤0.99, it is fully closed plug type to judge grid dam；If 0.99<F≤2.92 then judge grid dam for half occlusion type；If F>2.92, then it is unobstructed type to judge grid dam.The present invention considers multifactor impact, choose the dimensionless groups such as volumetric concentration, opposed open degree, raceway groove longitudinal slope, eliminate dimensional effect, with reference to indoor water tank model experiment data, it provides grid dam and occludes critical comprehensive criterion formula, it can determine that grid dam occlusion condition and grid dam opening line space design provide foundation to be reasonable, further can provide foundation for practical engineering application.
Description
Technical field
The present invention relates to debris flow control works technical field, more particularly to a kind of grid dam block viscous mud-flow occlusion
Critical comprehensive judging method.
Background technology
Mud-rock flow engineering measure is most effective debris flow means, it include check dam, debris dam, drainage groove, aqueduct,
Bright cave etc., wherein debris dam are a kind of most common engineering measures.By structure type, debris dam can be divided into solid type debris dam and
Two major class of permeable debris dam.And permeable debris dam drainage performance is excellent, can make debris flow body water and soil in a relatively short period of time
Separation, and in non-debris flow period, debris dam interior section silt particle can be carried by flow through dam body gap, and then increase
Debris dam effective storage.It can be said that permeable debris dam, which integrates, blocks row function, block and slightly arrange thin function admirable, thus increasingly
By extensive use.
At present, China achieves certain progress for the research of permeable debris dam, is gradually built in Wenchuan earthquake disaster area
Some permeable debris dams, such as window dam, slit dam, check dam, grid dam, block and slightly arrange thin performance, can be effective
Big particle in mud-rock flow is reduced, improves dam body stress condition, there is good structural strength and stability, while weaken mudstone
The impact and destruction for downstream are flowed, there is wide development space compared to solid type debris dam.
As shown in Figure 1, grid dam 1 belongs to one kind of infiltration type crib dam, the plane lattice dam and use made including steel
The space lattice dam that steel pipe, the space lattice dam for combining steel member manufacture and precast reinforced concrete structure make.It is penetrating
In type debris dam, grid dam is again distinct with other permeable debris dams (such as window dam, slit dam, broach dam), opening
Rate is generally large.There are vertical beam, generally steel structure in plane grid dam compared to check dam increase, and compared to window dam
Its aperture opening ratio bigger；The country block to grid dam viscous mud-flow performance carry out system research it is less.
《Debris flow guide》In mention, grid dam can be used for retain containing megalith, the water-rock debris flow of big erratic block, dilute property mudstone
The high sand-containing flood of a large amount of bed loads is flowed and carried under one's arms, is also disposed at the raceway groove of viscous mud-flow appearance alternate with flood；Grid
Dam include plane and solid type, plane grid dam be mainly used for raceway groove is narrow, dam body is relatively low, debris flow scale and effect lotus
Carry smaller situation, solid type grid dam is then mainly used for that dam body is higher, debris flow scale is larger, imposed load and grid
The larger situation of bulk.It can be said that the scope of application that grid dam is applied to debris flow control works is wider.
Grid dam is compared with other permeable debris dams, also following characteristics：After its most of component can be by prefabrication
Assembling, both shortens the duration, in turn ensures construction quality, saves material, and investment reduction is conducive to dam body maintenance management.Meanwhile
For Tibet region and the scenic spot in mountain area is predominantly located in, mostly containing drift wood, grid dam floats wood and block dam break for reducing
The secondary harm brought has preferable control effect.Blocking about grid dam, to occlude critical comprehensive criterion public for viscous mud-flow
Formula is the important references index of grid dam designed openings spacing, is critical issue urgently to be resolved hurrily at present.
Publication No. CN 103343526A, publication date disclose a kind of window for the Chinese invention patent on October 9th, 2013
Mouth dam intercepts mud-rock flow occlusion type identification method and its application.This method is only for window dam dam type, and criterion only considers
Influence of the dam body opening parameter to occlusion, does not consider the influence of mud-rock flow property, raceway groove longitudinal slope to dam body occlusion condition；Publication number
For CN 106096216A, publication date discloses a kind of check dam occlusion table for the Chinese invention patent on November 9th, 2016
Existing method of discrimination, application.This method is only for check dam dam type, and criterion does not account for shadow of the raceway groove longitudinal slope to occlusion
It rings.Using the two patents as the prior art of representative, criterion formula is mainly used for judging that window dam, check dam are closed
Type is filled in, for grid dam occlusion condition and is not applied to；And external main research grid dam is blocked water-rock debris flow, for the viscous of China
The occlusion condition research of property mud-rock flow is less.
Invention content
The purpose of the present invention provides a kind of consideration mud-rock flow volumetric concentration, mud-rock flow aiming at the deficiencies in the prior art
The grid dam of characteristic diameter, grid dam opening spacing and raceway groove longitudinal slope occludes critical comprehensive criterion, is closed for rationally determining grid dam
Plug situation and grid dam opening line space design provide foundation, adapt to the demand of engineer application.
The present invention provides a kind of grid dam viscous mud-flows of blocking to occlude critical comprehensive judging method, including：
Step 1, the unit weight γ of mud-rock flow is determined by field investigationc, unit kN/m3, mud is determined by field sampling
Rock glacier wholegrain diameter grading curve is so as to obtain characteristic diameter d95Value, unit m；The longitudinal slope tan θ of in-site measurement raceway groove choose
The grid dam of actual measurement or design opening spacing b, unit m；
Step 2, grid dam is calculated according to the following formula occlude critical comprehensive criterion F：
Wherein, CvFor mud-rock flow volumetric concentration；B for grid dam be open spacing, unit m；d95For debris flow characteristic grain size, i.e.,
In wholegrain diameter grading curve cumulative amount be 95% corresponding particle size values, unit m；Tan θ are raceway groove longitudinal slope, value for 0.10~
0.25；γcFor mud-rock flow unit weight, unit kN/m3, value is 18~22；γwFor the unit weight of water in mud-rock flow, unit kN/m3, take
Value 10；γsFor the unit weight of solid particle in mud-rock flow, unit kN/m3, value 26.5.
Step 3, if F≤0.99, it is fully closed plug type to judge grid dam；If 0.99<F≤2.92 then judge lattice
Sub- dam is half occlusion type；If F>2.92, then it is unobstructed type to judge grid dam.
Preferably, by the method be applied to grid dam occlusion condition prediction, check and instruct grid dam be open between
Away from design.
The present invention considers multifactor impact, chooses the dimensionless such as volumetric concentration, opposed open degree, raceway groove longitudinal slope ginseng
Number with reference to indoor water tank model experiment data, provides grid dam and occludes critical comprehensive criterion formula, can be rationally to determine grid
Dam occlusion condition and grid dam opening line space design provide foundation, further can provide foundation for practical engineering application.
Description of the drawings
Fig. 1 is grid dam structure diagram；
Fig. 2 is mud-rock flow wholegrain diameter grading curve；
Fig. 3 is grid dam occlusion critical pumping rate experiment value.
Specific embodiment
The invention discloses a kind of grid dam viscous mud-flows of blocking to occlude critical comprehensive criterion formula and its application.The public affairs
Formula fully considers the volumetric concentration C of viscous mud-flowv, debris flow characteristic grain size d95, grid dam opening spacing b, raceway groove longitudinal slope tan
The influence of the principal elements such as θ, and then judge the occlusion condition on grid dam；Prediction available for grid dam occlusion condition, check with
And the design of grid dam opening spacing.
Compared with prior art, the present invention considers multifactor impact, chooses volumetric concentration, opposed open degree, raceway groove
The dimensionless groups such as longitudinal slope eliminate dimensional effect, with reference to indoor water tank model experiment data, provide grid dam and occlude critical synthesis
Criterion formula can determine that grid dam occlusion condition and grid dam opening line space design provide foundation to be reasonable, and adapting to engineering should
Demand.
Embodiment one
Certain debris flow gully is located at Bailong River Basin south of Gansu Province Wudu area Jiao Gong towns Nian Jia villages the north, and drainage area is
2.54km2, main channel length 1.71km, relative relief 1451m, ditch bed longitudinal slope is than drop 22%.Landslide, avalanche development in basin,
Outwash and Accumulation In Debris-flow enrich, and drop bank development in raceway groove, block stone distribution easily breaks out mud-rock flow, and serious threat occupies
The villager of debris fans and house, farmland are stayed in, directly threatens population up to 1180 people, about 80,000,000 yuan of property, harm
Degree is big.
By field investigation, the unit weight for determining mud-rock flow is 19.3kN/m3；Field sampling analyzes mud-rock flow wholegrain
Diameter grading curve (as shown in Figure 2), obtains characteristic diameter d95For 1.0m；In-site measurement raceway groove longitudinal slope is 0.22；It opens on grid dam
Mouth spacing is 2.0m.
Critical comprehensive criterion formula is occluded according to grid dam, determines CvIt is 0.56, b/d95It is 0.22 for 2.0, tan θ, brings into
It is 1.57 that formula, which obtains criterion F, and prediction grid dam is half blocked state.
Embodiment two
Certain debris flow gully is located at Bailong River Basin south of Gansu Province Wudu area Liang Shui towns Hou Ba villages north side, and drainage area is
11.56km2, main channel length 5.97km, relative relief 998m, ditch bed longitudinal slope is than drop 17%.ROCK MASS JOINT is developed in basin, soil
Body is loose, broken, and slump, avalanche are extremely developed, and Zhigou cutting in both sides is strong, and pole is conducive to the rapid of rainfall and collects, and easily breaks out
Mud-rock flow, serious threat the safety of exit or entrance of a clitch resident's life, property and 212 national highway traffic.
By field investigation, the unit weight for determining mud-rock flow is 20.5kN/m3；Field sampling analyzes mud-rock flow wholegrain
Diameter grading curve (as shown in Figure 2), obtains characteristic diameter d95For 1.0m；In-site measurement raceway groove longitudinal slope is 0.17；As needed, if
It is full blocked state to count grid dam, it is thus necessary to determine that the opening line space design value on grid dam.
Critical comprehensive criterion formula is occluded according to grid dam, needing grid dam, criterion F need to be less than for full blocked state
0.99, it brings formula into and obtains b/d951.93 need to be less than, i.e. grid dam opening spacing b need to be less than 1.93m.To sum up, grid dam is open
Line space design value takes below 1.93m.
Claims (2)
1. a kind of grid dam is blocked, viscous mud-flow occludes critical comprehensive judging method, which is characterized in that including：
Step 1, the unit weight γ of mud-rock flow is determined by field investigationc, unit kN/m3, mud-rock flow is determined by field sampling
Wholegrain diameter grading curve is so as to obtain characteristic diameter d95Value, unit m；The longitudinal slope tan θ of in-site measurement raceway groove choose actual measurement
Or grid dam opening the spacing b, unit m of design；
Step 2, grid dam is calculated according to the following formula occlude critical comprehensive criterion F：
Wherein, CvFor mud-rock flow volumetric concentration；B for grid dam be open spacing, unit m；d95For debris flow characteristic grain size, i.e. wholegrain
In diameter grading curve cumulative amount be 95% corresponding particle size values, unit m；Tan θ are raceway groove longitudinal slope, and value is 0.10~0.25；
γcFor mud-rock flow unit weight, unit kN/m3, value is 18~22；γwFor the unit weight of water in mud-rock flow, unit kN/m3, value 10；
γsFor the unit weight of solid particle in mud-rock flow, unit kN/m3, value 26.5.
Step 3, if F≤0.99, it is fully closed plug type to judge grid dam；If 0.99<F≤2.92 then judge grid dam
For half occlusion type；If F>2.92, then it is unobstructed type to judge grid dam.
2. grid dam according to claim 1 is blocked, viscous mud-flow occludes critical comprehensive judging method, which is characterized in that
The method is applied to the occlusion condition prediction on grid dam, checks and instruct the design of grid dam opening spacing.
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| CN201810050516.5A CN108166435B (en) | 2018-01-18 | 2018-01-18 | Blocking critical comprehensive judgment method for viscous debris flow blocked by check dam |
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| CN201810050516.5A CN108166435B (en) | 2018-01-18 | 2018-01-18 | Blocking critical comprehensive judgment method for viscous debris flow blocked by check dam |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108960680A (en) * | 2018-07-27 | 2018-12-07 | 中国地质科学院探矿工艺研究所 | Debris flow loose source activity determination method |
| CN110067230A (en) * | 2019-04-16 | 2019-07-30 | 中国科学院、水利部成都山地灾害与环境研究所 | A kind of window dam opening parameter determination method for viscous mud-flow |
| CN110952508A (en) * | 2019-12-16 | 2020-04-03 | 北京师范大学 | Method and device for preventing and treating mountain torrents and debris flow disasters |
| CN113486428A (en) * | 2021-07-08 | 2021-10-08 | 中国科学院、水利部成都山地灾害与环境研究所 | Design method and application of opening of permeable debris flow sand dam and permeability evaluation method |
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| CN106096216A (en) * | 2016-08-15 | 2016-11-09 | 中国科学院、水利部成都山地灾害与环境研究所 | Check dam obturation performance method of discrimination, application |
| CN107133423A (en) * | 2017-06-02 | 2017-09-05 | 中国科学院、水利部成都山地灾害与环境研究所 | A kind of single otch dam kerf width design method for being used to prevent and treat the wooden mud-rock flow of drift |
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| CN103276687A (en) * | 2013-05-31 | 2013-09-04 | 中国科学院、水利部成都山地灾害与环境研究所 | Calculating method and calculating application of forms of debris flow siltation behind silt arresters |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108960680A (en) * | 2018-07-27 | 2018-12-07 | 中国地质科学院探矿工艺研究所 | Debris flow loose source activity determination method |
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| CN110067230A (en) * | 2019-04-16 | 2019-07-30 | 中国科学院、水利部成都山地灾害与环境研究所 | A kind of window dam opening parameter determination method for viscous mud-flow |
| CN110952508A (en) * | 2019-12-16 | 2020-04-03 | 北京师范大学 | Method and device for preventing and treating mountain torrents and debris flow disasters |
| CN110952508B (en) * | 2019-12-16 | 2021-01-29 | 北京师范大学 | Prevention and control method for mountain torrents and debris flow disasters |
| CN113486428A (en) * | 2021-07-08 | 2021-10-08 | 中国科学院、水利部成都山地灾害与环境研究所 | Design method and application of opening of permeable debris flow sand dam and permeability evaluation method |
| CN113486428B (en) * | 2021-07-08 | 2023-08-11 | 中国科学院、水利部成都山地灾害与环境研究所 | Design method and application of opening of permeable debris flow silt stop dam and permeability evaluation method |
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