CN105178125B - A kind of lake region High-filled emkankment is blown sand embankments construction method and embankment structure - Google Patents

Abstract

Blow sand embankments construction method and embankment structure the present invention provides a kind of lake region High-filled emkankment, which blows sand embankments construction method, including step 1, establishes drainage system；Step 2, fill check dam；Step 3, the construction of embankment staged and layered hydraulic fill sand；The smooth compacting of step 4, embankment；Step 5, Embankment Subsidence and horizontal displacement observation, carry out in next step, step 2 being carried out when the height of embankment is not reaching to design requirement when the height of embankment reaches design requirement；Step 6, bound edge soil construction；Step 7, sealing soil construction.The lake region High-filled emkankment roadbed quality that embankments construction method is built out of blowing sand is good, not only accelerates project progress and also reduces engineering cost, has not only solved the problem of no Tu Yuan, but also the sand source that rationally make use of local river to enrich.

Description

A kind of lake region High-filled emkankment is blown sand embankments construction method and embankment structure

Technical field

The present invention relates to road construction field, particularly a kind of lake region High-filled emkankment is blown sand embankments construction method, still A kind of lake region High-filled emkankment is blown sand embankment structure.

Background technology

At present, domestic and international roadbed is generally filled using soil, the cubic meter of stone, and construction technology is ripe, and Subgrade Construction Quality is high, stability It is good.Desert region cubic metre of earth is rare, is filled more using aeolian sand, and construction technology is also very ripe, and construction quality, which meets to use, to be wanted Ask.Blast technique is an emerging technique, is chiefly used in cofferdam protection works and large area platform filling construction at present.Pass through blast energy It is enough to solve the rare problem of the earthwork, and local supplies can be efficiently used, while can achieve the purpose that to clear up river.Southern area Water system is flourishing, and all containing abundant sand, large storage capacity in river, and utilization rate is very low.Only a small number of low-grade highways, which use, at present blows Sand, which fills, to be formed, and high-grade highway is more rare using blowing sand to fill sea.Generally all by the super remote haul distance roping earthwork, certain Engineering cost is added in degree, causes to waste.So efficiently use channel sand source has become inevitable.

The content of the invention

In order to solve the problems, such as that traditional blast is built the road of low quality, the present invention provides a kind of lake region High-filled emkankment to blow sand Embankments construction method and road structure, the lake region High-filled emkankment roadbed quality that embankments construction method is built out of blowing sand is good, not only Accelerate project progress and also reduce engineering cost, not only solved the problem of no Tu Yuan, but also rationally make use of local river rich Rich sand source.

The technical solution adopted by the present invention to solve the technical problems is：A kind of lake region High-filled emkankment is blown sand embankments construction side Method, comprises the following steps：

Step 1, establish drainage system；

Step 2, fill check dam；

Step 3, the construction of embankment staged and layered hydraulic fill sand；

The smooth compacting of step 4, embankment；

Step 5, Embankment Subsidence and horizontal displacement observation, next step is carried out when the height of embankment reaches design requirement, when The height of embankment carries out step 2 when being not reaching to design requirement；

Step 6, bound edge soil construction；

Step 7, sealing soil construction.

A kind of lake region High-filled emkankment is blown sand embankment structure, and lake region High-filled emkankment embankment structure of blowing sand is high by above-mentioned lake region Fill out roadbed embankments construction method of blowing sand to be made, lake region High-filled emkankment embankment structure of blowing sand includes being cascading from bottom to top Sand bedding course, back-up sand layer and capping layer, the both sides and middle part of roadbed are equipped with longitudinal french drain, and sand bedding course has the both sides with roadbed The connection of longitudinal french drain horizontal french drain, the top of longitudinal french drain of the both sides of roadbed is equipped with gutter, and the both sides of roadbed are equipped with Bound edge soil, the both sides of roadbed are equipped with the chute being used for draining ditch water discharge.

The invention has the advantages that the lake region High-filled emkankment is blown sand, the roadbed quality that embankments construction method is built out is good, Not only accelerate project progress and also reduce engineering cost, not only solved the problem of no Tu Yuan, but also rationally make use of local river The sand source that road enriches.

Brief description of the drawings

The present invention is described in further detail below in conjunction with the accompanying drawings.

Fig. 1 be lake region High-filled emkankment blow sand embankments construction method construction when schematic cross-sectional view.

Fig. 2 be lake region High-filled emkankment blow sand embankments construction method construction when floor map.

Fig. 3 is that lake region High-filled emkankment is blown sand the schematic cross-sectional view of embankment structure.

Wherein 1. longitudinal french drains, 2. permeable geotextiles, 3. gutters, 4. sand bedding courses, 5. chutes, 6. longitudinal check dams, 7. horizontal check dam, 8. back-up sand layers, 9. capping layers, 10. bound edges soil, 11. horizontal intercepting ditch.

Embodiment

It should be noted that in the case where there is no conflict, the feature in embodiment and embodiment in the application can phase Mutually combination.Below with reference to the accompanying drawings and the present invention will be described in detail in conjunction with the embodiments.

A kind of lake region High-filled emkankment is blown sand embankments construction method, is comprised the following steps：

Step 1, establish drainage system；

Step 2, fill check dam；

Step 3, the construction of embankment staged and layered hydraulic fill sand；

The smooth compacting of step 4, embankment；

Step 5, Embankment Subsidence and horizontal displacement observation, (back-up sand layer 8 is formed) when the height of embankment reaches design requirement Carry out in next step, step 2 being carried out when the height of embankment is not reaching to design requirement；

Step 6, bound edge soil construction；

Step 7, sealing soil construction.

In this embodiment, step 1 includes：

Step 1.1, set longitudinal french drain 1 in the both sides of roadbed and middle part, and horizontal french drain is set every 50 meters or so；

Step 1.2, set gutter 3 on the top of longitudinal french drain 1 of the both sides of roadbed, and sand bedding course 4 is laid with situ face And permeable geotextiles 2 are laid with sand bedding course 4；

Step 1.3, set horizontal intercepting ditch 11 at segmentation, and 5 He of chute is set every 50 meters or so in roadbed both sides Drop well is connected with gutter 3, as depicted in figs. 1 and 2.

Soil erosion and the change to hydrology state should be able to be reduced to greatest extent by establishing drainage system, reduce interference river Road, water channel or existing irrigation, can promptly exclude recirculated water, avoid influencing the stability and surrounding enviroment of roadbed.Soft Ji Chu During reason, before sand bedding course construction, earth's surface is smooth, prevents low-lying director's phase ponding, has to add permeable geotextiles on sand bedding course 2, accelerate the discharging consolidation of sand road dike.

Draining for blast, can use and directly set the modes such as discharge opening, pipe drain, irrigation canals and ditches draining.The position of discharge opening Put related with the area in hydraulic reclamation area, the outlet port of sediment outflow pipe and direction, be generally located in the hydraulic reclamation area dead angle away from spoil disposal pipeline Locate (hydrostatic), easy to maintain although economical, the mud siltation toward discharge opening is serious, need to constantly rinse, and the water released is easy Influence surrounding environment；Pipe drain is more effective to local draining, but is difficult the water for excluding large area in time, is more suitable for small-sized Dredger Filling Engineering；So engineering carries out draining by the way of irrigation canals and ditches draining, structure temporary drainage system (referring to Fig. 2), and according to Need to set tapping pipe (the permeable geotextiles of mouth of pipe bag) and suction pump, to exclude the water that blast leaves in time.

Specifically, setting gutter 3 away from roadbed slope foot 2m or so place, 3 size of gutter meets mini-excavator dredging .Roadbed side slope top sets longitudinal check dam 6, and sets discharge outlet in position.Discharge outlet neglects greatly blast plant capacity Depending on, the both sides check dam at discharge outlet need to be packed in bag sand bag or plastic film consolidation process.

Carried out since blast is segmented, horizontal check dam 7 and intercepting ditch are set at segmentation, set at embankment both sides are per 50m One interim chute 5 and drop well is connected with the gutter 3 at slope foot, and sets sedimentation basin near gutter 3 as needed, 5 bottom of chute need to be laid with plastic film, and A is blast direction in Fig. 1.

Gutter 3 should connect neighbouring irrigation canals and ditches, but during whole roadbed hydraulic reclamation, the water of blast is flowed into through discharge outlet to be arranged Ditch should be discharged into local drainage system again after precipitation filters, and avoid polluted source, farmland, fishing pool etc..

Draining inside embankment

Since the water during blast is bigger, the sand in roadbed will reach closely knit, it is also desirable to there is certain water content, Roadbed substrate ponding is bound to cause, if not in time discharging water, long period of soaking substrate, causes substrate to soften, or due in side slope It is outer to corrode slope foot there are differential water pressures, slope failure is caused, subgrade stability is destroyed, causes embankment to cave in and collapsed with road surface.This Positive effect is played to the draining inside roadbed with the mode of bound edge after clay in embodiment, sand combination can be solved substantially The problem of position shipwreck is to exclude.

The setting of french drain

Longitudinal french drain 1 is set in the middle part of both sides gutter, roadbed, per 50m between left and right away from setting horizontal french drain, while it is vertical, Horizontal french drain is connected with exterior water system.After longitudinal french drain 1 and horizontal french drain are excavated with small machine, wrapped up by permeable geotextiles thick Gravel or rubble composition.

In step 2, the check dam filled includes the longitudinal check dam 6 being arranged on beyond roadbed design width and is arranged on Horizontal check dam 7 at segmentation, the longitudinal direction check dam are wrapped up using plastic film, which, which is equipped with, is used for the draining The discharge outlet of System drainage, the soil that first layer check dam is dug out using establishing during drainage system are filled, opened from second layer check dam Begin to fill using the sand of hydraulic reclamation.

Specifically, before blast, check dam need to have been built beyond roadbed design width, first layer check dam can be used and excavated The soil in gutter fills, and is filled on the outside of roadbed slope foot, to ensure the compactness of roadbed slope foot.Its cross dimensions is blown according to every layer Depending on sand thickness, first layer check dam is unsuitable blocked up, and general thickness is not more than 1m, and width at dam crest is no less than 80cm, as long as can Meet homeostasis.Since the second layer, check dam is filled using the sand of hydraulic reclamation.The inner side on dam is laid with plastic film, Avoid washing away.Due to high-fill roadbed, brush slope difficulty is larger, excavates and brushes slope amount for reduction later stage bound edge soil construction is anti-, block water Dam is preferably used as a part for roadbed, but must be strictly controlled its compaction quality.

Before blast, it is also necessary to upper blast equipment and arrangement pipeline, specifically：

Blast number of devices is determined according to the construction period, blast ship, mortar pump, force (forcing) pump etc. are installed in position, added The large scale equipments such as press pump must firmly install, and set up rain-proof shelter.Sediment outflow pipe uses steel pipe or plastic tube, caliber 31.5cm, root Determine to manage to obtain quantity according to blast distance.

Sediment outflow pipe avoids highway crossing, avoids producing negative pressure because of abrupt slope, sharp turn as far as possible according to field condition.Into approach After dike hydraulic reclamation scope, stringing is carried out according to embankment hydraulic reclamation width, height, number of devices, power etc..Sediment outflow pipe mouth of pipe distance blocks water Dam is no less than 5 meters, prevents the check dam that destroys by rush of water.

Hydraulic reclamation width, which can be divided into full width and half range, to carry out, and during framing hydraulic reclamation, time interval is unsuitable long, and height difference cannot mistake Greatly, avoid embankment Transverse Subsidence asynchronous.This project uses full width hydraulic reclamation, and sediment outflow pipe is laid with along embankment center line, meanwhile, as far as possible Direct form arrangement is considered as, in pipeline and embankment transposition section, burying processing under pipeline.

When hydraulic reclamation distance exceeds blast equipment maximum capacity, increase force (forcing) pump or solved using the method for secondary suction. When sediment outflow mouth of pipe elevation exceedes sand pump H-Max and is unable to sediment outflow, using additional force (forcing) pump.

In step 3, embankment staged and layered hydraulic fill sand construction carries out in dry season, and the length of segmentation is 200 meters or so, The length of i.e. every section embankment is 200 meters or so, when the design height of embankment is less than or equal to 2 meters, a hydraulic reclamation to design height, When the design height of embankment is more than 2 meters, layering hydraulic reclamation to design height, the thickness of each layering is more than or equal to 1 meter and small In 2 meters.

Specifically, blast is divided into direct blast and indirect blast, direct blast is directly by sand blast to roadbed from river；Between It is to be salvaged sand on ship by sand dredger to connect blast, concentrates and stacks, then is blown to roadbed by blast pipeline.My project uses straight Blast method is connect, direct blast can be divided into underwater two kinds of riverbed blast and dry wash blast again.

Underwater riverbed blast is that sand ship is parked in the water surface, and pipeline falls in river bed, by sand clean out pipe water jetting at high pressure by water-bed sand Rush, then extracted out sand and river water by sand pump.Such a method belongs to hidden construction under river, and difficulty is larger：First, river flow water Middle blast pipeline is difficult to fix, and causes pipeline to play pendulum；Second, blast equipment is conventional equipment, do not observe river bed Sha Yuan, Situations such as pipeline is contacted with sand.Therefore blast amount is difficult to control, inefficiency.

Dry wash blast is that sand ship is placed directly on sand face, is rushed dry sand by sand clean out pipe water jetting at high pressure, sand and water Sand boat bottom is flow to, then is extracted out sand and water by sand pump.Such a method operates under the conditions of visual completely, and construction is convenient, high Effect.

Construction practices and summary by two methods, blast preferably carries out in dry season, efficient and economical.

Check dam (including 6 longitudinal check dams 6 and horizontal check dam 7) is assembled with sand in both sides before blast, check dam uses Plastic film wraps up, and prevents that during blast current destroy by rush of water check dam, each one discharge outlet of blast paragraph concentrated setting, row Filled in the mouth of a river with sand pocket.

Carried out using segmentation propulsion mode, i.e., after the completion of one section is blown, then spreading pipeline hydraulic reclamation hypomere, one layer has often been blown through pressure Hydraulic reclamation last layer again after real qualified.Segmentation distance is about 200m or so.When depth of fill is less than 2m, a hydraulic reclamation can be made；When When depth of fill is more than 2m, it should be blown using layering, lift height is generally 1m~2m.But if overstepping the extreme limit height, once blow It is too thick, the easy unstability of embankment, while consider compaction problems, hydraulic reclamation thickness is generally 0.5m~1m at this time, and maximum lift height is not Preferably more than 1.2m.

When depth of fill is less than Slab culvert (the present embodiment 2.5m-3.5m), fill core concrete can be according to construction Condition is suitably accelerated.More than Slab culvert, to ensure roadbed reclamation, hydraulic reclamation speed should be slowed down, with sedimentation and horizontal position Move observational data and judge whether embankment is stablized, avoid causing destabilization because hydraulic reclamation is too fast or loading is uneven.

To at the passage, end of the bridge and other structure platform back ofs the body had abundant water resources using water pendant rolled-on method filling construction technique.Water Pendant rolled-on method filling construction technique comprises the following steps：

1. push filler:Bull-dozer longitudinally allocates sand push to embankment section out of roadbed both sides or short distance.

2. pave filler:Filler in push to embankment section is paved and flattened with bull-dozer, or is matched somebody with somebody using bull-dozer Close level land leveling, bull-dozer is no more than 30cm per layer thickness after paving.

3. cofferdam:Segmentation sets cofferdam on the roadbed for paving, having flattened, will be according to longitudinal slope, horizontal slope size when setting cofferdam Section is suitably drawn, length is not less than 10m, and width is not less than 5m.Cofferdam is highly not less than 30cm, and width is not less than 30cm.

4. pour water:Cofferdam starts to pour water after setting, and pouring water to be carried out continuously, and flow rate of water flow should be larger when pouring water, sand Head height on base top surface is controlled in more than 20cm.

5. roll:Head height starts to roll in the case of being maintained at 20cm, is rolled using vibrated roller, rolls hour wheel Mark answers the 1/2 of overlapping single-wheel width, and vibration pressure omits more than the 1/3 of machine overlapped wheels stitch width.It is when wheelmark is covered with whole work surface One time.Number of rolling is typically no less than three times.The place that machinery does not arrive can carry out vibration tamp with immersion vibrator.

6. waiting sand base top surface superfluous water to sample detection compactness after having oozed, to be ground water pendant again when compactness is unqualified Pressure, untill qualification.

In the present embodiment, step 4 includes：

Step 4.1, repeatedly flatten precompressed layer of sand and draining with bull-dozer, until compactness reaches 90%；

Step 4.2, with the flat layer of sand of land leveller essence；

Step 4.3, rolled with vibrating roller, this is rolled rolls according to static pressure, weak vibroroller cmpacting and strong vibration Mode carry out successively；

Step 4.4, with vibrating roller pushed open check dam, the check dam and the layer of sand of inside is flattened at the same time.

Specifically, for general subgrade, generally use road roller roll and can achieved the desired results.But for sharp sand Or almost for inviscid sandy soil, since sand is a kind of bulk material, usually by solid-state (sand), gaseous state (air), liquid (water) three phase composition, its outstanding feature are that coherency is very poor, too roll and easily produce sand liquefaction, influence rolling effect.Add Upper hydraulic reclamation thickness is big, is difficult to make pure blast reach defined compacting criteria with conventional compacting methods, therefore use conventional compaction Method is difficult sand is reached comparatively ideal consolidation effect, and for such case, --- draining is closely knit --- stone roller is rushed closely knit using water The method of densification reality is repeated, until compactness is qualified.

Since the clay content of sand is different with modulus of fineness, draining 2d~5d is needed to differ after general blast, as the case may be Depending on.It is closely knit to accelerate the draining of sand, with reference to blast progress, precompressed just can be flattened with bull-dozer after blast, pass through soil-shifting The disturbance of machine, makes the water in sand gush out upwards, is repeated, until no water is gushed out.By the way that draining is closely knit and the stone roller of bull-dozer Pressure, compactness can reach 90% or so at this time.

After bull-dozer flattens precompressed, the aqueous situation of sand is detected in time, 20cm positions, which reach, below sand top surface most preferably contains After water, essence is carried out using land leveller and is put down, is then rolled using vibrating roller.Follow static pressure → weak vibroroller cmpacting → The technique that strong vibration rolls, using 18T vibrated rollers voltage stabilizing one time, vibroroller cmpacting is carried out after the completion of first pass static pressure；Roll When, it is fast after first slow, it is first weak shake after shake by force, then first weak vibroroller cmpacting 1 time carries out strong vibration 3 times again, last static pressure one time.Pressure Road machine travel speed starts with a slow speed, maximal rate 3km/h, and road roller starting parking at the uniform velocity must not will suddenly play emergency stop, midway U-turn is turned, and normally rolls overlapping 1/3 wheel of wheelmark.

Rolling for check dam position will be paid much attention to, and flatten the precompressed later stage in bull-dozer, check dam is pushed open, same with inside When flatten, land leveller essence is flat, rationally controls water content, check dam position water content is low, it is necessary to sprinkle water, after moisturizing in most cases It is carried out at the same time and rolls with inside.

Rational water content should be controlled when being compacted to roadbed both sides bound edge clay, is rolled using 2t baby rollers, As general soil subgrade, the binding site of clay and sand should be fully compacted rolling method in roller compaction process, be kept away as far as possible Exempt from mixing and the uncompacted situation of clay for sand and clay.Finished when bound edge clay rolls, should detect and be compacted by code requirement Degree, flatness, width, absolute altitude (emphasis checks the compactness of the binding site of sand and clay).For roadbed part corner Band, such as abutment or barricade back, the part that road roller cannot roll, using Miniature walking vibrated roller or frog compactor Carry out rolling compacting.

Detected on compactness

Hydraulic fill sand Subgrade Compaction, adopt how to be detected it is more accurate,《Specification》In recommend sand replacement method, Douche (water bag method), core cutter method, nuclear gauge method.Sand replacement method is most common test method and simple.By repetition test, adopt Compactness can be accurately reflected with sand replacement method.Since the general filled slope of hydraulic reclamation thickness ratio is much bigger, compactness need to be same The different depth of position is detected.By practice, 20 and 50 sampling below sand face, and depending on different hydraulic reclamation thickness. Compaction requirement standard, detection frequency are identical with general earthfill road embankment.

In the step 5 of the present embodiment, the sinking speed of sand is controlled by being highly divided into three-level in embankment, three fraction Wei not be below limiting altitude, more than limiting altitude and be less than limiting altitude above 2m, more than limiting altitude 2m；

When below limiting altitude, to accelerate to fill speed, to strive for consolidation time；More than limiting altitude and it is being less than pole More than limit for height degree during 2m, within 15mm/d, the lateral displacement control at slope foot exists the surface settlement speed control at roadbed center Within 8mm/d；When more than limiting altitude 2m, the surface settlement speed control at roadbed center is within 10mm/d, at slope foot Lateral displacement is controlled within 5mm/d.

Specifically, during embankment hydraulic reclamation, to be settled and displacement monitoring, carry out in time sedimentation and displacement observation and Record, it is general per one layer of hydraulic reclamation, a stability monitoring is carried out, and draw the data such as settlement observation curve.Pass through experiment and research point Analysis, determines ground displacement control standard in work progress.Marked in construction when discovery sedimentation or horizontal displacement abruptly increase or more than control On time, survey time should be encrypted, carries out dynamic tracking, analysis reason.Take if necessary and slow down hydraulic reclamation speed, or even pause hydraulic reclamation, treat Bit-rate is reduced to the hydraulic reclamation that can just continue last layer within control standard.Monitoring should be based on controlled level displacement.Treat road After base fills, routine observation sinking equally is wanted, to analyze subgrade stability state.

In actual mechanical process, to be controlled appropriately by settling with stablizing the data observed and data analysis Standard.

Fill the time be no less than ground shearing strength increase need consolidation time, filling speed should be by limiting altitude (this project Slab culvert is 2.5m-3.5m) below, the limiting altitude~limiting altitude above 2m and more than limiting altitude 2m Three class control：It should accelerate to fill speed below limiting altitude, strive for consolidation time；Limiting altitude~limiting altitude above 2m, road The surface settlement speed at base center is preferably controlled within 15mm/d, and the lateral displacement at slope foot is preferably controlled within 8mm/d；The limit During more than height 2m, the surface settlement speed at roadbed center is preferably controlled within 10mm/d, and the lateral displacement at slope foot preferably controls Within 5mm/d.

Laying of roadway should carry out after settlement stability, be controlled using double standards.I.e.：It is required that the settlement after construction calculated is less than Feasible value is designed, while requires the settling amount of observation in continuous two months to be monthly no more than 5mm, can be unloaded and be excavated road groove and start Laying of roadway.

In embodiment, step 6 includes：

Behind step 6.1, brush slope, check whether the draining of sand bedding course 4 is unobstructed, such as impeded drainage, carry out step step 6.2, As draining is smooth, step step 6.3 is carried out；

Step 6.2, in bound edge soil bottom be laid with 50cm blotters in advance, the blotter beyond roadbed design width not Less than 30cm, rubble is using permeable geotextiles parcel and grinding compacting；

Step 6.3, horizontal slice fill bound edge soil and layered rolling, and the loose laying depth of every layer of bound edge soil is no more than 20cm, Bound edge soil exceeds roadbed design width 30cm；

Step 6.4, bound edge soil and internal sand are carried out at the same time precompressed.

Specifically, the construction of bound edge soil carries out bound edge using clay soil, cohesive soil requires liquid limit to be less than 50%, and plasticity index is not More than 26, also to reach the requirement of roadbed filling minimum strength and maximum particle diameter in addition, compactness, which must reach, accordingly fills The requirement of depth, cohesive soil will have larger caking property, stability.In addition, in the bound edge mode of blast, packed can also glue The modes such as (sand) soil bound edge, packed planting soil and grass-seed, it is contemplated that construction and draining difficulty, this project is using bound edge after clay Mode carries out bound edge.Bound edge clay is paved using artificial hanging wire, and paving width is than designing wide 30cm.

Sand water stability is good, water penetration is strong, depression is fast, full water is easily compacted, capillary water height is small, is a kind of good Filling roadbed material.But sand there are easy sloughing after dehydration, is not easy to be compacted, does the defects of stability is poor as filling material.Adopt The advantages of fetch earth the dam filling construction of burnt-in sand, i.e., fills out core using sand, and the mode of clay bound edge can play two kinds of materials.

Bound edge soil width

1. the form of fracture of blast roadbed uniqueness determines its stability mainly by grade of side slope, depth of fill, bound edge soil The influence of three factors of width.And for hydraulic fill sand roadbed without relevant regulations in existing design specification.

2. by consulting and consulting literatures, in 1003-1995 (2008) 05-0070-04《Bound edge sand-filled subgrade stability of slope Property analysis》Influence of the bound edge soil width to subgrade stability is analyzed in one text：

The bound edge soil width that I changes roadbed side slope carries out strength reduction finite element method stability analysis, destroys criterion and takes As the horizontal displacement u of slope shoulder point>4cm or vertical displacement v>6cm, is considered as roadbed destruction.

II roadbed safety coefficient when bound edge soil is broadening rises therewith, works as width>Safety coefficient is begun to decline after 2.5m, is said It is bright due to the effect of bound edge soil moral be plastic zone to roadbed interior shifting so that give full play to the filler angle of friction that shakes out is big, confined pressure compared with Shearing strength high advantage when big, so as to improve the stability of sand roadbed side slope.The bound edge soil of one fixed width can make the peace of roadbed Overall coefficient is more than the roadbed of full clay filling, but wide bound edge soil can cause plastic zone to concentrate in bound edge soil, roadbed safety Coefficient can decline on the contrary.

By above-mentioned analysis, bound edge soil width uses 1m wide in the present embodiment.This project of bound edge soil construction uses rear bound edge Order.Structure check dam is first carried out in construction, plastic film or waterproof geotextiles is laid with the inside of check dam, prevents from washing away and block water Dam.After one layer of end of layering hydraulic reclamation process and compactness reach requirement, next layer of construction is carried out, up to hydraulic reclamation to design After absolute altitude, brush slope is carried out according to design side slope and bound edge soil construction width.

After brushing slope, check whether sand bedding course draining is unobstructed, and such as impeded drainage, 50cm rubbles are laid with advance in bound edge soil bottom Bed course, bed course are no less than 30cm beyond roadbed design width, and rubble is wrapped up using permeable geotextiles, after grinding compacting, then is constructed Bound edge soil, prevents blotter from blocking.

Bound edge soil is filled using horizontal slice, layered rolling, and bound edge soil layering loose laying depth is no more than 20cm, beyond roadbed Design width 30cm.Rational water content should be controlled when rolling, rolling method is as general soil subgrade.

After treating bound edge soil construction, bound edge soil and internal sand are carried out at the same time precompressed.This process makes sand and clay Construct relatively independent, sand construction will not be made to stop work because of the hysteresis of clay, engineering can be accelerated fully using machinery and manpower Progress.Simultaneously as the two construction interval is shorter, compactness different inclined in sand junction in construction is also overcomed by precompressed Difference, makes sand is asynchronous with soil sedimentation to be addressed, is finally reached subgrade stability, uniform settlement by the precompressed phase.

In the step 7 of the present embodiment, sealing soil uses cohesive soil, and the liquid limit of the cohesive soil is less than 50%, the cohesive soil Plasticity index be no more than 26, sealing soil thickness is 50cm or so, and sealing soil construction is toppled over using dumper, and horizontal slice is filled out Build, layering loose laying depth is no more than 20cm, fills out center after first filling out both sides, is bulldozed roughly with bull-dozer, loading machine, then use land leveller It is levelling, holding fill out it is thick uniformly, then carry out the construction that the roadbed of 30cm thickness finishes and form capping layer 9.

Specifically, generally carrying out sealing using clay, cohesive soil requires liquid limit to be less than 50%, and plasticity index is no more than 26, Also to reach roadbed filling minimum strength as defined in specification and maximum particle diameter requirement in addition, as compactness does not reach requirement, The measures such as water mixing mud can be taken.Consider construction and impermeable needs, sealing soil thickness is 50cm or so.

For the sealing soil of all fronts, in the vertical, section should not occur " jumping " with section joining place, cause height difference, And it should smoothly transit.In the horizontal, the road camber same with road surface is made.

Sealing soil is toppled over using dumper, and horizontal slice is filled, it is layered loose laying depth and is no more than 20cm.First fill out both sides After fill out center, be bulldozed roughly with bull-dozer, loading machine, then levelling with land leveller, holding fill out it is thick uniformly.Terminate in sealing soil construction Afterwards, the construction of the roadbed finishing of 30cm thickness is carried out.

High-filled emkankment embankments construction method of blowing sand in lake region further includes step 8：Side slope protection, the side slope protection include interim anti- Shield and permanent protection.

Provisional protection

Width and thickness are filled to ensure every layer, while avoids washing away for rainwater side slope from causing the loss of sand side to silt side up Ditch, damages farmland.After roadbed filling to certain altitude, provisional protection is carried out to the side slope of roadbed, to ensure that roadbed is normal Fill the normal construction with follow-up permanent protection engineering.It is neat according to the slope gradient pile of design using woven bag sand loading, Stacking height is mono- layer of 40cm~50cm, can play the role of provisional protection, avoid the rainwater opposite side when permanent protection does not perform Slope is washed away, and ensures the stabilization of roadbed.

Permanent protection

Permanent protection is constructed according to design drawing, this project is completely located in flood storage protective embankment, side slope protection waterlogging water level+0.5m C20 concrete locking-type prefabricated sections are used below, and above section fills protection using the cast-in-place criss-cross skeletal internal grass planting of C20 concretes.

A kind of lake region High-filled emkankment is blown sand embankment structure, and lake region High-filled emkankment embankment structure of blowing sand is high by above-mentioned lake region Fill out roadbed embankments construction method of blowing sand to be made, lake region High-filled emkankment embankment structure of blowing sand includes being cascading from bottom to top Sand bedding course 4, permeable geotextiles 2, back-up sand layer 8 and capping layer 9, the both sides and middle part of roadbed are equipped with longitudinal french drain 1, sand bedding course 4 The horizontal french drain connected with longitudinal french drain 1 of the both sides of roadbed is had, the top of longitudinal french drain 1 of the both sides of roadbed is equipped with row Ditch 3, the both sides of roadbed are equipped with bound edge soil 10, and the both sides of roadbed are equipped with the chute 5 being used for 3 draining of gutter, back-up sand layer 8 Middle filling is river sand, as shown in Figure 3.

In this embodiment, the thickness of sand bedding course 4 is 50cm, and the thickness of capping layer 9 is 60cm, longitudinal french drain 1 and roadbed slope The distance of foot is 2 meters, a horizontal french drain is set every 50 meters, the width of bound edge soil 10 is 1 meter, and a urgency is set every 50 meters Chute 5, chute 5 are the top of horizontal intercepting blind drain 11.

The above, is only the specific embodiment of the present invention, it is impossible to the scope implemented with its restriction invention, so it is equivalent The displacement of component, or the equivalent variations made according to scope of patent protection of the present invention and modification, should all still fall within what this patent was covered Category.In addition, between technical characteristic and technical characteristic in the present invention, between technical characteristic and technical solution, technical solution with Use can be freely combined between technical solution.

Claims (1)

1. A kind of embankments construction method 1. lake region High-filled emkankment is blown sand, it is characterised in that lake region High-filled emkankment embankment of blowing sand is applied Work method comprises the following steps：

   Step 1, establish drainage system；

   Step 1.1, set longitudinal french drain (1) in the both sides of roadbed and middle part, and horizontal french drain is set every 50 meters；

   Step 1.2, on the top of longitudinal french drain (1) of the both sides of roadbed set gutter (3), and sand bedding course is laid with situ face (4) and on sand bedding course (4) permeable geotextiles (2) are laid with；

   Step 1.3, set horizontal intercepting ditch (11) at segmentation, and chute (5) and drop are set every 50 meters in roadbed both sides Well is connected with gutter (3)；

   Step 2, fill check dam；

   In step 2, the check dam filled includes being arranged on longitudinal check dam (6) beyond roadbed design width and being arranged on Horizontal check dam (7) at segmentation, the longitudinal direction check dam are wrapped up using plastic film, which, which is equipped with, is used for the row The discharge outlet of water system draining, the soil that first layer check dam is dug out using establishing during drainage system fills, from second layer check dam Start to fill using the sand of hydraulic reclamation；

   Step 3, the construction of embankment staged and layered hydraulic fill sand；

   In step 3, embankment staged and layered hydraulic fill sand construction carries out in dry season, and the length of segmentation is 200 meters, when embankment When design height is less than or equal to 2 meters, a hydraulic reclamation to design height, when the design height of embankment is more than 2 meters, layering hydraulic reclamation is extremely Design height, the thickness of each layering is more than or equal to 1 meter and less than 2 meters；

   The hydraulic fill sand is that sand ship is parked in the water surface, and pipeline falls in river bed, is rushed water-bed sand by sand clean out pipe water jetting at high pressure, then Sand and river water are extracted out by sand pump；

   The smooth compacting of step 4, embankment；

   Step 4.1, repeatedly flatten precompressed layer of sand and draining with bull-dozer, until compactness reaches 90%；

   Step 4.2, with the flat layer of sand of land leveller essence；

   Step 4.3, rolled with vibrating roller, this rolls the side rolled according to static pressure, weak vibroroller cmpacting and strong vibration Formula carries out successively；

   Step 4.4, with vibrating roller pushed open the check dam, the check dam and the layer of sand of inside is flattened at the same time；

   Step 5, Embankment Subsidence and horizontal displacement observation, carry out in next step, working as embankment when the height of embankment reaches design requirement Height carry out step 2 when being not reaching to design requirement；

   In steps of 5, the sinking speed of sand is controlled by being highly divided into three-level in embankment, the three-level be respectively limiting altitude with Under, more than limiting altitude and be less than limiting altitude above 2m, more than limiting altitude 2m；

   When below limiting altitude, speed is filled in quickening；

   More than limiting altitude and when being less than limiting altitude above 2m, the surface settlement speed control at roadbed center 15mm/d with Interior, the lateral displacement at slope foot is controlled within 8mm/d；

   When more than limiting altitude 2m, the surface settlement speed control at roadbed center is within 10mm/d, the lateral position at slope foot Control is moved within 5mm/d；

   Step 6, bound edge soil construction；

   Behind step 6.1, brush slope, check whether the draining of sand bedding course (4) is unobstructed, such as impeded drainage, step 6.2 is carried out, such as draining It is smooth, carry out step 6.3；

   Step 6.2, be laid with the blotter of 50cm thickness in bound edge soil bottom in advance, which exceeds roadbed design width not Less than 30cm, rubble is using permeable geotextiles parcel and grinding compacting；

   Step 6.3, horizontal slice fill bound edge soil and layered rolling, and the loose laying depth of every layer of bound edge soil is no more than 20cm, bound edge Soil exceeds roadbed design width 30cm；

   Step 6.4, bound edge soil and internal sand are carried out at the same time precompressed；

   Step 7, sealing soil construction；

   Sealing soil uses cohesive soil, and the liquid limit of the cohesive soil is less than 50%, and the plasticity index of the cohesive soil is no more than 26, sealing Soil thickness is 50cm, and sealing soil construction is toppled over using dumper, and horizontal slice is filled, and layering loose laying depth is no more than 20cm, Center is filled out after first filling out both sides, is bulldozed roughly with bull-dozer and loading machine, then it is levelling with land leveller, holding fills out thickness uniformly, then carries out The construction of the roadbed finishing of 30cm thickness forms capping layer (9)；

   Step 8：Side slope protection；

   The side slope protection includes provisional protection and permanent protection；

   The provisional protection is neat according to the slope gradient pile of design using woven bag sand loading, and stacking height is 40cm~50cm mono- Layer；

   The permanent protection uses C20 concrete locking-type prefabricated sections for below waterlogging water level+0.5m, higher than the portion of the waterlogging water level+0.5m Divide and protection is filled using the cast-in-place criss-cross skeletal internal grass planting of C20 concretes.