CN109610258A - A kind of joint electro-osmosis method prevention and treatment " pot cover effect " causes the road based structures of disaster - Google Patents
A kind of joint electro-osmosis method prevention and treatment " pot cover effect " causes the road based structures of disaster Download PDFInfo
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- CN109610258A CN109610258A CN201910044612.3A CN201910044612A CN109610258A CN 109610258 A CN109610258 A CN 109610258A CN 201910044612 A CN201910044612 A CN 201910044612A CN 109610258 A CN109610258 A CN 109610258A
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- vapour barrier
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/11—Improving or preserving soil or rock, e.g. preserving permafrost soil by thermal, electrical or electro-chemical means
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Architecture (AREA)
- Soil Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- General Engineering & Computer Science (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The present invention discloses a kind of road based structures combined electro-osmosis method prevention and treatment " pot cover effect " and cause disaster, including airtight coating and hydrophobic vapour barrier, the hydrophobic vapour barrier is close and is lower than dew point depth, electric osmose system is additionally provided between the airtight coating and the hydrophobic vapour barrier, the electric osmose system includes longitudinal anode, longitudinal cathode, the longitudinal direction anode is layed in below the airtight coating, and the longitudinal direction cathode is layed in above the hydrophobic vapour barrier.Road based structures proposed by the present invention, drainage by electroosmosis can be carried out to the hydrophobic vapour barrier top unsaturation soil body in the ice-melt phase in spring to reduce its moisture content, make to be gathered in moisture under airtight coating due to vaporous water condensation and be discharged in time in the annual ice-melt phase, accumulation of the ground top moisture under circular temperature loads effect is prevented, thus the disaster that more effectively prevention and treatment " pot cover effect " may cause.
Description
Technical field
The present invention relates to road based structures technical fields, and in particular to draws to a kind of joint electro-osmosis method prevention and treatment " pot cover effect "
The road based structures for playing disaster are got down the highway, railway bed disaster suitable for prevention and treatment airfield runway road base disaster and similar situation.
Background technique
In northwest China arid and semi-arid cold district, level of ground water is deeper, and capillarity has underground water lifting height
Limit, underground water are smaller on the influence of shallow soil water content, and the moisture in shallow soil is typically derived from temperature difference driving and is transported to top
Condensation of the vaporous water in shallow-layer low-temperature space.When there are the airtight coatings such as runway Dao Jihuo highway, railway bed for soil body surface
When, the evaporation of soil body surface is obstructed, and the moisture of shallow soil is assembled under the cover, is ultimately formed at level of ground water and under coating
Moisture content is high, the low phenomenon of intermediate soil moisture content, referred to as " pot cover effect ".The presence of " pot cover effect ", makes in shallow soil
Moisture frost heave, melt contracting, Frozen-thawed cycled is serious to cause base soil strength reduction, and differential settlement and the frost boiling of road base etc. are tight
Weight engineering project disaster.
The disaster that " pot cover effect " causes is similar with subgrade frost heaving.Currently, the control method of subgrade frost heaving mainly has:
One, increase roadbed according to the actual situation, make the upper subgrade remotely lower or earth's surface water surface；Reinforcement road surface will
It easily causes the soil of frost boiling to change under road surface within certain depth and fills in soil；With clinker, brickbat, the peat of compression, pine and cypress etc. make every
Warm layer prevents roadbed from freezing line and elapses to depths, is thinned and freezes layer.
Two, lateral french drain is set, lateral french drain is arranged under the slot of road with timely in the frost boiling section to highway longitudinal slope less than 3%
Longitudinal water flow and spring in discharge water penetration base melt excessive moisture when phase soil matrix thaws.
Three, sewer is set, and pipe sewer, which can be used, to be reduced the level of ground water near roadbed or intercepted side by side with sewer is intercepted
Except the intermediary water of lateral roadbed；Improve pavement structure, is laid with Base with Sand Gravel Cushion or rendzinas, cinder lime soil padding.
Four, evengranular gravel, rubble etc. is used to lead warm layer as ventilative.
Five, road frost boiling, the service condition of road improvement and the anti-slurry roadbed knot of setting are administered using geosynthetics
Structure controls road frost boiling, surrounds roadbed etc. with polychloroethylene film.
Increase however, control method as described above only can solve road face bottom water content caused by capillary water effect water delivery
The disaster of initiation is not particularly suited for disaster caused by water content increase caused by condensation.Therefore the above method is not appropriate for
Diaster prevention and control caused by " pot cover effect " in the lower situation of arid and semi-arid cold district level of ground water.
In recent years, professor Yao Yangping has made intensive studies the mechanism of " pot cover effect ", proposes one on this basis
Kind is laid with the control method of hydrophobic vapour barrier below road foundation dew point depth.This method can preferably prevent deep layer Dao Jitu
Middle vaporous water is migrated upwards, and dredges the moisture that roadbed top is gathered in through vapour barrier.However, part vaporous water it is possible to
Gathered across vapour barrier and under condensation in the airtight infratectal soil body, and insulating course and airtight coating it
Between the soil body be generally in unsaturated state, soil body free drainage speed is very slow, only can not by conventional hydrophobic layer draining
In time, it is completely exhausted out, with the seasonal variety of annual temperature, the moisture content in the soil body of roadbed top will be built up, and final
It may cause disaster.
Summary of the invention
In response to the problems existing in the prior art, the purpose of the present invention is to provide a kind of joint electro-osmosis methods to prevent and treat " pot cover effect "
Cause the road based structures of disaster.
To achieve the above object, the technical solution adopted by the present invention is that:
A kind of joint electro-osmosis method prevention and treatment " pot cover effect " causes the road based structures of disaster, including airtight coating and hydrophobic
Vapour barrier, the hydrophobic vapour barrier is close and is lower than dew point depth, between the airtight coating and the hydrophobic vapour barrier
It is additionally provided with electric osmose system, the electric osmose system includes longitudinal anode, longitudinal cathode, and the longitudinal direction anode is layed in described impermeable
Below gas coating, the longitudinal direction cathode is layed in above the hydrophobic vapour barrier.Gaseous state is prevented by the hydrophobic vapour barrier
Water migrate upwards and prevent and treat under layer generate vaporous water condensation and ponding；The ice-melt phase by the electric osmose system accelerate it is hydrophobic every
The drainage speed of the unsaturation soil body between gas-bearing formation and airtight coating prevents the day product moon of moisture under many years temperature change lower layer
It is tired.The geological disaster that " pot cover effect " may cause can be more efficiently prevented and treated by this method.
Specifically, the hydrophobic vapour barrier include be layed in 37 lime earth layer that is close and being lower than the dew point depth, if
Sandy gravel stratum in 37 lime earth layer top, and longitudinal french drain of the sandy gravel stratum two sides is set and is equidistantly set along longitudinal direction
The transverse direction on longitudinal french drain is set to draw water general pipeline；The longitudinal direction cathode is tightly attached to above the sandy gravel stratum.When underground water or
When aqueous vapor permeates up the hydrophobic vapour barrier, sandy gravel stratum and 37 lime earth layer arrange the water of aggregation to longitudinal french drain, then lead to
It crosses the general pipeline that laterally draws water water is discharged；Water between hydrophobic vapour barrier and airtight coating in the unsaturation soil body is from the longitudinal direction
Anode finally collects in above the sandy gravel stratum, longitudinal french drain of the sandy gravel stratum two sides and edge to longitudinal cathode motion
The transverse direction that longitudinal direction is placed equidistant on the longitudinal french drain water that general pipeline will collect that draws water is discharged in time.
Specifically, the 37 lime earth layer and the sandy gravel stratum section along road base longitudinal direction it is symmetrical and along center to two
Side is in tilted layout to dredge moisture to two sides and converge, and at inverted " V " type on road based structures cross section, the inclined gradient is between 1%
Between~5%.To the inclined 37 lime earth layer in two sides and the sandy gravel stratum, is conducive to accelerate to dredge and drain, avoids water
Aggregation in the middle part of the road Fen base.
Preferably, distance is 20~30 centimetres between the top of the 37 lime earth layer and the dew point depth.
Specifically, the dew point depth is determined based on following steps: based on thermostat layer mild relative humidity determines steam
Pressure；Dew-point temperature is determined based on vapour pressure；And dew point depth is determined based on ground temperature-depth distribution curve.
Saturated vapor at this temperature is obtained using following formula (1) according to obtained soil body thermostat layer ground temperature is monitored throughout the year
Pressure:
Wherein, uv,satFor saturated vapor pressure, T is thermostat layer ground temperature.
Then, it is acquired according to the relative humidity of soil body hole gas at a temperature of the obtained thermostat layer of measurement and by formula (1)
Saturated vapor pressure, utilize following formula (2) calculate vapour pressure:
uv=RHuv,sat (2)
Wherein, RH is relative humidity, uvFor vapour pressure.
In soil body hole gas relative humidity under measuring thermostat layer humidity, for example, can be wet with thermocouple psychrometer, Cold Mirrors
The equipment such as degree meter, polymer resistive/capacitance sensor are sampled measurement.
Then, by vapour pressure u counted in formula (2)vIt substitutes into following formula (3) and obtains dew-point temperature:
Wherein, TdFor the dew-point temperature being calculated.
Finally, can determine dew point depth based on monitoring gained ground temperature-depth distribution curve throughout the year.
Preferably, longitudinal anode is laid on 5~10 centimeters of the airtight coating or less.
Preferably, the hydrophobic vapour barrier is with a thickness of 40-60 centimetres.
Preferably, longitudinal anode and longitudinal cathode are the Electro-kinetic Geosynthetics of corrosion resistance.It can be with
Select one or more of carbon black, carbon fiber, conductive filled polymer, corrosion resistant wire as longitudinal sun
Pole and longitudinal cathode.
Specifically, the electric osmose system further includes the DC power supply powered for longitudinal anode and longitudinal cathode,
And the conducting wire of the connection DC power supply.It is equipped with independent DC power supply, can according to need, be powered draining at any time, arrangement
Get up also fairly simple, is easily installed and safeguards.
Specifically, the electric osmose system starts in the annual ice-melt phase, it is continuous every time to be powered 3~5 days.Annual ice-melt phase, soil
Water content in body can increased dramatically, and carry out drainage by electroosmosis at this time, and effect is best.
Compared with prior art, the beneficial effects of the present invention are: 1, hydrophobic vapour barrier joint electro-osmosis method can be more efficient
The geological disaster that ground prevention and treatment " pot cover effect " may cause；2, the hydrophobic vapour barrier prevents vaporous water from migrating upwards and prevent and treat layer
It is lower generate vaporous water condensation and ponding；3, accelerated in the ice-melt phase by electric osmose non-between hydrophobic vapour barrier and airtight coating
It is saturated the drainage speed of the soil body, prevents accumulating over a long period for moisture under many years temperature change lower layer；4, sandy gravel stratum two sides are set
Longitudinal french drain and the transverse direction being placed equidistant on longitudinal french drain along longitudinal direction are drawn water general pipeline, can be by the water in hydrophobic vapour barrier
The moisture for dividing and assembling to longitudinal cathode is timely discharged, and reduces the moisture in the soil body to the greatest extent, reduces geological disaster and sends out
Raw risk；5, dew point depth, Ke Yigeng are determined by determining vapour pressure, dew-point temperature and ground temperature-depth distribution curve
Add the position for accurately arranging hydrophobic vapour barrier and longitudinal cathode, reaches best drainage effect.
Detailed description of the invention
Fig. 1 is road based structures cross section structure schematic diagram of the invention；
Fig. 2 is road based structures hierarchical diagram of the invention；
In figure: 1, longitudinal anode；2, longitudinal cathode；3, sandy gravel stratum；4, longitudinal french drain；5,37 lime earth layer；6, dew point is deep
Degree；7, conducting wire；8, DC power supply；9, laterally draw water general pipeline；10, airtight coating；11, hydrophobic vapour barrier.
Specific embodiment
Below in conjunction with the attached drawing in the present invention, technical solution of the present invention is clearly and completely described, it is clear that
Described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on the implementation in the present invention
Example, those of ordinary skill in the art's all other embodiment obtained under the conditions of not making creative work belong to
The scope of protection of the invention.
As shown in Figure 1, a kind of joint electro-osmosis method prevention and treatment " pot cover effect " causes the road based structures of disaster, including airtight cover
Cap rock 10 and hydrophobic vapour barrier 11, the hydrophobic vapour barrier 11 is close and is lower than dew point depth 6, airtight 10 He of coating
Electric osmose system is additionally provided between the hydrophobic vapour barrier 11, the electric osmose system includes longitudinal anode 1, longitudinal cathode 2, described
Longitudinal anode 1 is layed in 10 lower section of airtight coating, and the longitudinal direction cathode 2 is layed in 11 top of hydrophobic vapour barrier
And it is lower than dew point depth 6.
Specifically, as shown in Fig. 2, the hydrophobic vapour barrier 11 includes being layed in close and being lower than the dew point depth 6
37 lime earth layer 5, the sandy gravel stratum 3 set on 5 top of 37 lime earth layer, and the longitudinal direction of 3 two sides of sandy gravel stratum is set
French drain 4 and the transverse direction being placed equidistant on longitudinal french drain 4 along longitudinal direction are drawn water general pipeline 9；The longitudinal direction cathode 2 is tightly attached to described
3 top of sandy gravel stratum.When underground water or aqueous vapor permeate up the hydrophobic vapour barrier 11, sandy gravel stratum 3 and 37 lime earth layer 5 will
The water of aggregation is arranged to longitudinal french drain 4, then water is discharged by the general pipeline 9 that laterally draws water；Hydrophobic vapour barrier 11 and airtight coating
Water between 10 in the unsaturation soil body is moved from longitudinal anode 1 to longitudinal cathode 2, finally collects in the sandy gravel stratum
3 tops, longitudinal french drain 4 of 3 two sides of sandy gravel stratum and the transverse direction being placed equidistant on longitudinal french drain 4 along longitudinal direction are drawn water always
The water collected is discharged pipe 9 in time.
Specifically, the 37 lime earth layer 5 and the sandy gravel stratum 3 section along road base longitudinal direction it is symmetrical and along center to
Two sides are in tilted layout to dredge moisture to two sides and converge, and at inverted " V " type on road based structures cross section, the inclined gradient is 3%.
Specifically, calculating according to specific geographical location and climatic environment and determining vapour pressure and dew-point temperature, and be based on
The ground temperature in location-depth distribution curve determines dew point depth 6.
Preferably, longitudinal anode 1 is laid on 8 centimeters of the airtight coating or less.
Preferably, distance is 20 centimetres between the top of the 37 lime earth layer 5 and the dew point depth 6.
Preferably, with a thickness of 19 centimetres, the longitudinal direction cathode 2 is tightly disposed on the sandy gravel stratum 3 sandy gravel stratum 3
Side, the slightly below described dew point depth 6.
Preferably, the hydrophobic vapour barrier is with a thickness of 50 centimetres.
It preferably, the use of the carbon black with corrosion resistance is that material makes longitudinal anode 1 and longitudinal cathode 2.
Specifically, the electric osmose system further includes the DC power supply powered for longitudinal anode 1 and longitudinal cathode 2
8, and the conducting wire 7 of the connection DC power supply 8.It is equipped with independent DC power supply, can according to need, be powered draining at any time,
Arrangement get up it is also fairly simple, be easily installed and safeguard.
Specifically, the electric osmose system starts in the annual ice-melt phase, it is continuous every time to be powered 4 days.
The present invention is obstructed deep layer vaporous water by 37 lime earth layer 5 and migrated to top；37 lime earth is penetrated for part
The moisture that layer 5 condenses in shallow soil, when entering the spring ice-melt phase, it is liquid water to make shallow-layer that the moisture of the condensation, which melts,
Soil becomes with the unsaturation soil layer compared with high-moisture percentage；At this point, electric osmose system dc power supply 8 is connected, the water in the unsaturation soil body
By top longitudinal direction anode 1, longitudinal cathode 2 is fast moved downwards point under electroosmosis, and is discharged by sandy gravel stratum 3.Using oblique
The sandy gravel stratum 3 of slope formula can be finally blind to being longitudinally arranged at using pressure pump in time by the moisture dispatch of convergence to longitudinal french drain 4
Main sewer 8 on ditch 4 draws water.Using this method, part can be made through the vaporous water of 37 lime earth layer 5 since condensation is made
It can be quickly discharged in the annual ice-melt phase with the moisture being gathered under airtight coating 10, many years for reducing ponding under layer, which are accumulated, to be made
With thus the geological disaster that more effectively prevention and treatment " pot cover effect " may cause.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (10)
1. a kind of joint electro-osmosis method prevention and treatment " pot cover effect " causes the road based structures of disaster, including airtight coating and it is hydrophobic every
Gas-bearing formation, which is characterized in that the hydrophobic vapour barrier is close and is lower than dew point depth, the airtight coating and it is described it is hydrophobic every
Electric osmose system is additionally provided between gas-bearing formation, the electric osmose system includes longitudinal anode, longitudinal cathode, and the longitudinal direction anode is layed in
Below the airtight coating, the longitudinal direction cathode is layed in above the hydrophobic vapour barrier.
2. road based structures according to claim 1, which is characterized in that the hydrophobic vapour barrier is close and low including being layed in
In the 37 lime earth layer of the dew point depth, sandy gravel stratum set on 37 lime earth layer top, and be arranged in the gravel
Longitudinal french drain of layer two sides and the transverse direction being placed equidistant on longitudinal french drain along longitudinal direction are drawn water general pipeline；The longitudinal direction cathode is tight
It is affixed on above the sandy gravel stratum.
3. road based structures according to claim 2, which is characterized in that the 37 lime earth layer and the sandy gravel stratum are along road base
Section is symmetrical in longitudinal direction and is in tilted layout to two sides to dredge moisture to two sides and converge, in road based structures cross section along center
On at inverted " V " type, the inclined gradient is between 1%~5%.
4. road based structures according to claim 2, which is characterized in that the top of the 37 lime earth layer and the dew point are deep
Distance is 20~30 centimetres between degree.
5. road based structures according to claim 1 or 2, which is characterized in that the dew point depth is determined based on following steps:
Based on thermostat layer mild relative humidity determines vapour pressure；Dew-point temperature is determined based on vapour pressure；And based on ground temperature-depth point
Cloth curve determines dew point depth.
6. road based structures according to claim 1, which is characterized in that the longitudinal direction anode is laid on the airtight covering
Layer or less 5~10 centimeters.
7. road based structures according to claim 1, which is characterized in that the hydrophobic vapour barrier is with a thickness of 40-60 centimetres.
8. road based structures according to claim 1, which is characterized in that the longitudinal direction anode and longitudinal cathode are resistance to
Corrosive Electro-kinetic Geosynthetics.
9. road based structures according to claim 1, which is characterized in that the electric osmose system further includes for longitudinal anode
With the DC power supply of longitudinal cathode power supply, and the conducting wire of the connection DC power supply.
10. road based structures according to claim 1, which is characterized in that the electric osmose system starts in the annual ice-melt phase, often
Secondary continuous energization 3~5 days.
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| KR101932911B1 (en) * | 2018-07-05 | 2018-12-28 | (주)유성종합감리단건축사사무소 | Structure of settlemet-prevention of sidewalk-block in apartment complex |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104846711A (en) * | 2015-05-11 | 2015-08-19 | 河海大学 | Electro-osmosis method for reinforcing soil side slope |
| CN105064158A (en) * | 2015-07-08 | 2015-11-18 | 北京航空航天大学 | Prevention method for disasters caused by "pot effect" of airport runway |
| CN105088911A (en) * | 2015-07-29 | 2015-11-25 | 北京航空航天大学 | Novel runway foundation structure preventing and treating disasters caused by 'pot cover effect' |
| CN105256788A (en) * | 2015-11-04 | 2016-01-20 | 上海大学 | Saturated dredger soft soil foundation reinforcing treatment system and grid-type vacuum preloading and electroosmosis-method combined treatment method |
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