CN102864782B - Construction method for fast filling clay core rock-fill dam body - Google Patents
Construction method for fast filling clay core rock-fill dam body Download PDFInfo
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- CN102864782B CN102864782B CN201210403171.XA CN201210403171A CN102864782B CN 102864782 B CN102864782 B CN 102864782B CN 201210403171 A CN201210403171 A CN 201210403171A CN 102864782 B CN102864782 B CN 102864782B
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Abstract
The invention discloses a construction method for fast filling a clay core rock-fill dam body. The method comprises the following concrete steps of: dividing a core rock-fill dam into 9 large areas, carrying out base excavation of an upstream rock-fill area and a downstream rock-fill area of a dam base and then carrying out dam body filling construction after acceptance inspection; firstly, carrying out installation of a cushion material under upstream and downstream rock-fill areas, a horizontal filter material, and a corresponding composite geomembrane, and construction of materials of the upstream and downstream rock-fill areas; after finishing base treatment of a clay core wall area range of a riverbed section and concrete construction of a grouting corridor, carrying out the construction of a clay core wall under the top of the grouting corridor and highly-plastic clay; then carrying out full-section filling of a normal dam body and entirely lifting to the top of a dam to fill height. The construction method has the beneficial effects that the construction method is fast to construct, and a construction period is powerfully ensured, and filling quality meets related requirements. The construction method is suitable for filling and constructing a large-scale clay core rock-fill dam of which a normal construction progress of a front-period project is affected by immigration land requisition and complicated base treatment and the like while a finishing node target is invariable.
Description
Technical field
The present invention relates to a kind of construction method, particularly relate to a kind of construction method of dam embankment.
Background technology
Clay Core Wall Rockfill Dam is a kind of local material dam, suits measures to local conditions, gathers materials on the spot, thereby obtained very large development because it has in China's water conservancy construction climax in recent years.For guaranteeing the realization of the dual node target that power station retaining and flood control are passed the flood period, need to a kind ofly compared with casual labourer, in the phase, realize filling in a large number of dam body, meanwhile, also must guarantee that dam body has high-quality.
Summary of the invention
Given this, the object of the invention is to provide a kind of and is easy to grasp, quality is convenient to control, the construction method that can promote the use in a big way.
For solving above technical problem, technical scheme provided by the invention is to provide a kind of Clay Core Wall Rockfill Dam dam body quick filling construction method:
1) core wall rockfill dam is divided into 9 Ge great districts, according to Parallel to the flow direction, is followed successively by from top to bottom: ballast district, upstream, rockfill area, upstream, upstream transition district, filtration area, upstream, earth core district, filtration area, downstream, downstream transition region, rockfill area, downstream, kentledge district, downstream;
2) rockfill area, dam foundation upstream and downstream foundation excavation completes and carries out afterwards by inspection dam embankment construction; Dam embankment in earlier stage, first carry out bedding material and horizontal reverse filtrate and corresponding composite geo-membrane installation and the material construction of rockfill area, upstream and downstream thereof under basis, rockfill area, upstream and downstream, after river-bed section earth core district scope based process, irrigation gallery concrete construction complete, carry out irrigation gallery top following position earth core and highly plastic clay construction; Then carry out the full section of normal dam body and fill, rise overally to dam crest reclamation level.
Further, the program of filling in earth core district is for first filling the sole filtrate of redressing, then hearting both sides filter material, hearting material then, every layer of core-wall material with a layer filter material, roll simultaneously, put down rising; One deck Transition Materials rises after 2 layers of filter material of every rising and core-wall material; In the scope of the wide 30m in upstream and downstream, stockpile fills rising with core-wall district, every rising 2 floor in the core-wall district 1 floor stockpile that simultaneously rises, and rising is filled in circulation successively.
Further, described earth core is divided into highly plastic clay material district and earth core material district.
Further, described highly plastic clay material district and earth core material district unit construction sequence of dam embankment are:
1) fill unit plane survey,
2) after base surface acceptance(check), fill the measurement of sideline, unit, unwrapping wire,
3) charging, discharging, control earth material water content,
4) flat material, layer thickness control,
5) padfoot roller rolls,
6) roll quality examination, sampling,
7) after acceptance(check), enter next unit and fill, check and accept the defective step 5) of returning.
Further, the concrete construction method in described earth core district is: clay material is divided into unselected clay and highly plastic clay, near gallery both sides 2.5m scope, it is highly plastic clay, near cover plate 3.0m scope, it is highly plastic clay, remainder is unselected clay, clay material two work planes of minute upstream and downstream below gallery crest level fill, stride across and form one after gallery and fill work plane, clay material and dam body foundation face contact site first fill dam foundation filter material, then lay geomembrane, on geomembrane top, start to fill clay material, earth core material filling construction first carries out dam foundation filter material and fills, and then lays geomembrane, then measures unwrapping wire, finally carries out clay material and fills, clay material fills and frontly first material source is carried out to measurement of water-content coefficient, clay filling adopts attacks and occupies method construction, first the one end by surface of filling starts material loading, form material loading platform, platform height is controlled in strict accordance with the thick standard of loose laying, after large stone of clay completes, measurement is emitted and is rolled reference line, roll the parallel axis of dam of reference line, spacing 4m, adopt the parallel axis of dam direction of 20T padfoot roller exciting to roll, clay adopts advance and retreat mistake to roll apart from method, unselected clay rolls 8 times, wrong apart from 26cm, highly plastic clay rolls 6 times, near cover plate concrete 1.0m distal part position, adopt the quiet stone roller of vibrating roller 6 times, before highly plastic clay fills, gallery and the watering of cover plate concrete surface of the contact of Ying Yu highly plastic clay are moistening, and brush dense clay slip, the compacting of Pu Tu limit, limit, clay slip brushing height should be consistent and be connected with bottom coating with paving soil thickness, repaves soil and compacting after forbidding clay slip to dry up, clay is with water quality than being 1:2.5～1:3.0, and viscosity is as the criterion with wall built-up, coating layer thickness 3～5mm, and core-wall is from the second layer bankets, and the highly plastic clay contacting with cover plate should be prior to carrying out making with layer earth material.
Further, stockpile district, Transition Materials district and unit construction sequence of filter material district dam embankment are:
A) fill unit plane survey,
B) after base surface acceptance(check), fill the measurement of sideline, unit, unwrapping wire,
C) charging, discharging, during charging at dam external adding water,
D) flat material, layer thickness control,
E) supplement watering,
F) roll,
G) roll quality examination, after acceptance(check), enter next unit and fill, check and accept the defective step f) of returning.
Further, described filter material district is used filter material to fill, upstream and downstream filter material district is by F1, F2Liang Ge district forms, upstream F1, each 3.0m of F2 is wide, downstream F1, each 4.0m of F2 is wide, filter material is by the stock ground processing of natural sand gravel, the earth material content that is less than 0.075mm is not more than 5%, filter material fills front elder generation and carries out setting-out according to design size, filter material and adjacent clay material, Transition Materials boundary is clearly demarcated, sprinkling French chalk carries out and fills reference line, filling of filter material should have been put down rising with core wall filling building face, loaded filter and core-wall junction should adopt smooth drum vibratory roller to roll across seam, when loaded filter is connected with core-wall, adopt zigzag to fill, and making core-wall after first making filter material, when loaded filter is connected with Transition Materials, adopt equally zigzag to fill, when filter material fills, must keep moisture state, the F1 filter material that stock ground has just been produced must dewater, and adds water-wet before rolling, and amount of water is to reach wettability effect.
Further, described transition region is filled with Transition Materials, and the wide 12m of Transition Materials adopts bursting charge, and maximum particle diameter is not more than 300mm; The granule content that is less than 5mm should be in 15%～25% scope, and D15≤20mm, and the transmission coefficient after Transition Materials compacting should be greater than 5 * 10
-2cm/s, the granule content that is less than 0.075mm is not more than 5%; Transition Materials bulk degree 63cm, 56cm after compacting, compacted depth and filter material match; Transition Materials fills and adopts the method for attacking and occupying to fill, and first adopts excavator that the oversize stone with F2 contact site and concentrated piece stone are removed totally, and adopt the levelling of microlith slag charge after stone completes, and watering rolls; To strengthening the junction of the edges of two sheets of paper with F2 contact site, roll.
Further, stockpile district adopts stockpile to fill, and stockpile maximum particle diameter is not more than 800mm, and the granule content that is less than 5mm should be controlled at 10%～25%; The granule content that is not more than 0.075mm should be not more than 5%, and nonuniformity coefficient is greater than 10, and transmission coefficient is greater than 5 * 10
-2cm/s; Stockpile fills to adopt and attacks and occupies method, retreat method or mixing method is filled; Stockpile fills bulk degree 1.0m; Stockpile is sprinkled water before rolling, and the amount of water of stockpile is 10%～25%.
Further, the junction construction sequence in dam embankment upstream ballast district, rockfill area, upstream, upstream transition district, filtration area, upstream, earth core district, filtration area, downstream, downstream transition region, rockfill area, downstream, kentledge district, downstream is:
1) stockpile within the scope of core-wall material, filter material, Transition Materials and 30m has been put down rising;
2) first carry out the 1st layer of filter material and 2 layers of core-wall material and fill,
3) carry out again the 2nd layer of filter material and 2 layers of core-wall material and fill,
4) then carry out the 1st layer of Transition Materials and the 1st layer of stockpile fills;
5) the 2nd layer of filter material rolls together with the 1st layer of Transition Materials, stockpile with core-wall material,
6) rising is filled in circulation successively.
Useful, the quick filling construction method construction of Clay Core Wall Rockfill Dam dam body of the present invention fast, guarantees effectively, to fill quality and meet related request to the duration.The present invention is applicable to advance works and is subject to immigrant's expropriation of land, complicated foundation processing etc. to affect normal construction progress, and the constant large-scale Clay Core Wall Rockfill Dam filling construction of completion node target.
Accompanying drawing explanation
Fig. 1 is dam body Ge Liao district sequence of construction figure.
Fig. 2 is dam embankment total programme diagram of constructing.
Fig. 3 is dam body clay, highly plastic clay filling construction programme diagram.
Fig. 4 is dam body core-wall district, filtration area, transition region, rockfill area junction filling construction programme diagram.
The specific embodiment
Below in conjunction with accompanying drawing and specific embodiment, describe.Referring to Fig. 1 to Fig. 4.
1, determine dam zoning and various filling parameter
Core wall rockfill dam is divided into 9 Ge great districts, according to Parallel to the flow direction, is followed successively by from top to bottom: ballast district, upstream, rockfill area, upstream, upstream transition district, filtration area, upstream, earth core district, filtration area, downstream, downstream transition region, rockfill area, downstream, ballast district, downstream.Wherein, upstream and downstream filter material district is divided into F1 HeF2Liang Ge district, F1 filter material particle diameter used Dmax≤20mm wherein, 2.7mm≤D85≤9.5mm; F2 filter material particle diameter used Dmax≤80mm, 17mm≤D85≤45mm.Earth core district filler used comprises two kinds of highly plastic clay and unselected clays.
2, dam body Ge Liao district sequence of construction
For guaranteeing the quality of filling of integral dam quality, particularly core-wall district, dam body Ge Liao fills principle in district and is: guarantee the physical dimension of clay material, filter material, excessive material, do not allow filter material to occupy clay material, do not allow coarse granule to occupy fine grained while filling.Order is filled as shown in Figure 1 by each district, and in figure, sequence number represents the order of filling, and the gradient of junction, adjacent Liang Ge district is 1:0.75.
3, dam embankment total program of constructing
(1) rockfill area, dam foundation upstream and downstream foundation excavation completes and carries out afterwards by inspection dam embankment construction.Dam embankment in earlier stage, first carry out bedding material and horizontal reverse filtrate and corresponding composite geo-membrane installation and rockfill area material construction thereof under basis, upstream and downstream rockfill area, after river-bed section core-wall district scope based process, irrigation gallery concrete construction complete, carry out irrigation gallery top following position earth core and highly plastic clay construction.Then carry out the full section of normal dam body and fill, rise overally to dam crest reclamation level.Dam embankment total programme diagram of constructing is shown in Fig. 2.Composite geo-membrane is usingd plastic sheeting as antiseepage base material, and with the non-woven fabric compounded geotechnological impervious material forming, its barrier performance depends primarily on the barrier performance of plastic sheeting.At present, the plastic sheeting of the application of antiseepage both at home and abroad, mainly contains polyvinyl chloride, polyethylene, ethylene/vinyl acetate copolymer, and they are a kind of polymer chemistry flexible materials, proportion is less, and extensibility is stronger, and adaptive deformation ability is high, corrosion-resistant, low temperature resistant, good frost resistance.
(2) program of filling in core-wall district is for first filling the sole filtrate of redressing, then hearting both sides filter material, hearting material then, every layer of core-wall material with a layer filter material, roll simultaneously, put down rising.One deck Transition Materials rises after 2 layers of filter material of every rising and core-wall material.Upstream and downstream certain limit (wide 30m) stockpile fills rising with core-wall district, every rising 2 floor in the core-wall district 1 floor stockpile that simultaneously rises, and rising is filled in circulation successively.
4, dam embankment unit construction sequence
(1) highly plastic clay material district and unit construction sequence of earth core material district dam embankment are as shown in Figure 3.
(2) the junction construction sequence such as dam embankment core-wall material, filter material, Transition Materials, stockpile as shown in Figure 4.
The wide stockpile of core-wall material, filter material, Transition Materials and 30m has been put down rising.Fill order as follows: first carry out the core-wall material that filter material that the 1st layer thickness is 40cm and 2 layer thicknesses are 40cm and fill, then carry out the 2nd layer of filter material and 2 layers of core-wall material fill, then carry out the 1st layer of Transition Materials and the 1st layer of stockpile fills.The 2nd layer of filter material rolls together with the 1st layer of Transition Materials, stockpile with core-wall material, and rising is filled in circulation successively.
5, fill enforcement parameter
Rockfill Dam filling construction parameter is the basis that guarantees dam embankment quality and progress.Field compaction test is to fill front of paramount importance technical data demonstration, also be to determine that can dam fill and guarantee the important step of dam safety smoothly, generally speaking, in tender document or in fill placement technique requirement, the index proposing is suggestiveness, all requires in field compaction test, check and verify.Field compaction test is drafted construction parameter according to engineering analog method and is tested, the parameter that test draws, to control the key factor that can dam fill fast, as fixed in index is too high, in formally filling as being difficult for reaching, cause and increase ftercompction number of times too much and take heavier rolling apparatus to construct, efficiency can reduce, as fixed in index is low, for guaranteeing dam safety, may many engineering quantitys will be increased, also be unfavorable for engineering rapid construction, as not careful in field compaction test work, the suspension of works of likely having in the process of filling re-starts field compaction test, directly affect filling of dam body.
According to on-site rolling test result, management, to the reply of field compaction test report, design advice note and management meeting summary related request, Ge Liao fills in district construction parameter definite in process in Table 1.
Table 1 Ge Liao fills construction parameter in process in district
Illustrate: on gallery and cover plate limit, within the scope of 50cm, adopt 18t loader tire to roll 16 times.
6, the quick filling construction of dam body
Fill fast in 6.1 earth core districts
1) core that earth core is dam, what the quality that earth core fills quality was directly connected to dam body totally fills quality and security of operation.Clay material is divided into unselected clay and highly plastic clay, near gallery both sides 2.5m scope, it is highly plastic clay, near cover plate 3.0m scope, it is highly plastic clay, remainder is unselected clay, clay material two work planes of minute upstream and downstream below gallery crest level fill, and stride across to form one after gallery and fill work plane, and clay material and dam body foundation face contact site first fill dam foundation filter material, then lay geomembrane, on geomembrane top, start to fill clay material.Geomembrane is usingd plastic sheeting as antiseepage base material, and with the non-woven fabric compounded geotechnological impervious material forming, its barrier performance depends primarily on the barrier performance of plastic sheeting.At present, the plastic sheeting of the application of antiseepage both at home and abroad, mainly contains polyvinyl chloride and polyethylene, ethylene/vinyl acetate copolymer.
2) earth core material filling construction program is as follows:
After dam foundation filter material fills, carry out geomembrane laying, then measure unwrapping wire, finally carry out clay material and fill.
Clay material fills and frontly first material source is carried out to measurement of water-content coefficient, and moisture content deviation just allows dam in roping in standard allowed band, and the moisture content of upper dam earth material should be controlled between ω op-2%≤ω f≤ω op+2%, and ω op is optimum moisture content 27.1%.Clay filling adopts attacks and occupies method construction, and first the one end by surface of filling starts material loading, forms material loading platform, and platform height is controlled in strict accordance with the thick standard of loose laying, determines that bulk degree is 35cm, 28cm after compacting according to field compaction test.After large stone of clay completes, measurement is emitted and is rolled reference line, roll the parallel axis of dam of reference line, spacing 4m, adopts the parallel axis of dam direction of 20T padfoot roller exciting to roll, and clay adopts advance and retreat mistake to roll apart from method, unselected clay rolls 8 times, wrong apart from 26cm, highly plastic clay rolls 6 times, near cover plate concrete 1.0m distal part position, adopts the quiet stone roller of vibrating roller 6 times.Guarantee that highly plastic clay reaches design objective requirement.
3) before highly plastic clay fills, gallery and the watering of cover plate concrete surface of the contact of Ying Yu highly plastic clay are moistening, and brush dense clay slip, the compacting of Pu Tu limit, limit, clay slip brushing height should be consistent and be connected with bottom coating with paving soil thickness, repaves soil and compacting after forbidding clay slip to dry up.Clay is with water quality than being 1:2.5～1:3.0, and viscosity is as the criterion with wall built-up, coating layer thickness 3～5mm.Core-wall is from the second layer bankets, and the highly plastic clay contacting with cover plate should be prior to carrying out making with layer earth material.
4) clay material filled and will be closely connected with local meteorological department rainy season, before raining, in time clay was covered, and rain stops first the degree of compaction of surface of filling clay is detected afterwards, and the earth material moisture content in stock ground is detected, and all meets the demands and just allows recovery to fill.As higher because of the moisture content that rains in surface of filling clay, for accelerating to fill progress, can take to ted or with bulldozer, top layer clay is disposed.Clay to deposit will pile " car pusher ", rains and covers in time.Clay, because of insolation overlong time, can adopt waterwheel to spray the moistening rear recovery of a small amount of water and fill before filling.
5) for accelerating the speed of filling of earth core material, carry out test sense partitions, and according to detecting frequency requirement, surface of filling completes one and detects one, be ready in advance periodic duty face, clay material adopts Nucleus Density Apparatus to carry out the indexs of correlation such as moisture content and degree of compaction and detects.
Fill fast in 6.2 filter material districts
1) upstream and downstream in earth core district arranges filter material district, and upstream and downstream filter material district forms by F1, F2Liang Ge district, and each 3.0m of upstream F1, F2 is wide, and each 4.0m of downstream F1, F2 is wide.
Filter material is by the stock ground processing of natural sand gravel, in strict accordance with second wife, controls material source quality well, particularly will control well to be less than 0.075mm earth material content and to be not more than 5%.Filter material fills front elder generation and carries out setting-out according to design size, filter material and adjacent clay material, Transition Materials boundary are clearly demarcated, sprinkle French chalk and carry out and fill reference line, filling of filter material should have been put down rising with core wall filling building face, and loaded filter and core-wall junction should adopt smooth drum vibratory roller to roll across seam.
2), when loaded filter is connected with core-wall, adopt zigzag to fill, and making core-wall after first making filter material, guarantee that the design thickness of core-wall is not is not occupied.When loaded filter is connected with Transition Materials, also can adopt zigzag to fill, must guarantee that the design thickness of loaded filter is not is not occupied.
3) when filter material fills, must keep moisture state, the F1 filter material that stock ground has just been produced must dewater, and rule of thumb generally in stock ground, stores up 2～3 days, avoids forming because F1 filter material water content is excessive spring soil.To storing up the filter material of overlong time, be enhancing consolidation effect simultaneously, before rolling, add water-wet, amount of water is to reach wettability effect, amount of water should not affect the filling construction of the seepage prevention of core wall earth material being in contact with it simultaneously, rule of thumb adopt sprinkling truck Jia Shui, switch leaves to the medium water yield, with the travel speed of 2～3km, sprays and can be effective for 2 times.
Fill fast in 6.3 Transition Materials districts
1) between filter material and main rock filling, be provided with Transition Materials, the wide 12m of Transition Materials, adopts bursting charge, requires grating good continuously, and maximum particle diameter is not more than 300mm; Particle diameter is less than the granule content of 5mm should be in 15%～25% scope, and the native content that is less than this particle diameter accounts for particle diameter D15≤20mm of 15% of gross mass, and the transmission coefficient after Transition Materials compacting should be greater than 5 * 10
-2cm/s, the granule content that is less than 0.075mm is not more than 5%.Specific discharge under unit hydraulic gradient, represents that fluid is by the complexity of pore framework, and transmission coefficient is larger, and rock permeability is stronger.
2) Transition Materials fills and should strictly control material source quality well, Transition Materials bulk degree 63cm, and 56cm after compacting, compacted depth and filter material match.Transition Materials fills and adopts the method for attacking and occupying to fill, and first adopts excavator that the oversize stone with F2 contact site and concentrated piece stone are removed totally, and adopt the levelling of microlith slag charge after stone completes, and watering rolls.To strengthening the junction of the edges of two sheets of paper with F2 contact site, roll, guarantee that basic part placement grinding is closely knit.
Fill fast in 6.4 stockpile districts
1) stockpile district is as the main load-bearing district of dam, and material source quality control and filling quality control are the emphasis of construction.Stockpile requires grating good continuously, and maximum particle diameter is not more than 800mm, and the granule content that is less than 5mm should be controlled at 10%～25%; Be not more than 0.075mm particle diameter content and should be not more than 5%, nonuniformity coefficient should be greater than 10, and transmission coefficient should be greater than 5 * 10
-2cm/s.Explosion is carried out in strict accordance with blasting parameter in stock ground, and oversize stone is rejected in stock ground, and top layer, mountain top excavated material is carried out selectively going up dam, avoids defective material to be transported to dam facing.
2) stockpile fills and can adopt the method for attacking and occupying, retreats method, mixing method is filled.Stockpile fills bulk degree 1.0m, and the general method of attacking and occupying that adopts is filled, and first forms and fills platform, and vehicle is by platform loading and unloading material, and the method advantage of attacking and occupying is first to form platform, can control preferably and fill planeness; When transport vehicle flow is larger, also can adopts and retreat method discharging, vehicle is filling compaction plane loading and unloading material, and the method discharging of retreating can improve upper dam material intensity, less to auto tire wear, and shortcoming is that it is large that planeness is controlled difficulty if the control of stockpile spacing is bad; It is to retreat method and progress method combines that mixing method is filled, first form discharging platform, a part of vehicle is at platform loading and unloading material, and a part of vehicle adopts and retreats method at compaction plane loading and unloading material, mixing method is filled and can be controlled preferably planeness, also can improve upper dam transportation intensity simultaneously.
3) for strengthening the quality that rolls of stockpile, stockpile rolls front need and sprinkles water, the amount of water of stockpile is preferably 10%～25%, this engineering adopts, at upper dam road, filling up area is set, the filling up area of take adds water as main, dam facing is aided with high-lift pump artificial supplementation watering before rolling, and guarantees stockpile grinding compacting.
4) when winter temperature is lower, stockpile does not add water, for guaranteeing to fill quality, takes to reduce bulk degree, and layer thickness is controlled at below 90cm, and number of rolling is increased to 10 times by 8 times, has guaranteed the quality that rolls of low temperature season stockpile.
6.5 Clay Core Wall Rockfill Dams fill the special measure of taking fast
1) an interior road specially treated
For meeting the needs of rapid construction, it is inevitable that a large amount of plant equipment drops into, and current carrier is more and more to large-tonnage development trend, haulage vehicle quantity also requires corresponding increasing, requirement to road is more and more higher, and engineering practice proves, road is better, the haulage vehicle rate of attendance is higher, fills also corresponding raising of efficiency.
To transporting in field, major trunk roads are built roller compacted concrete and cure process is carried out on normal concrete road surface, guarantee vehicle safety even running.Ramp is arranged to crashproof big and heavy stone and hedging ramp, guarantee vehicle operating safety, avoid occurring car accident, improved bicycle conevying efficiency, ensure that dam fills the transportation of material unimpeded.
2) exploitation in stock ground and the setting of charge make-up area
Stock ground is self-evident to the importance of earth and rockfill dam, the most easily to affect the weakness that dam fills smoothly also, according to engineering practice, generally speaking, the geological prospecting working depth in stock ground can not show a candle to dam site, the stockpile of the amount of filling maximum particularly, often only depend on several exploratory headings or landform to reconnoitre and carry out geologic description, after marching into the arena, the possibility changing with tender document is very large, geological conditions generation great change, in tender document, there are materials to become without materials, be exactly that productive area diminishes, cannot form large scale mining or step mining conditions, be unfavorable for extensive machine instruction statement mining, directly can restriction dam fill on schedule, whether grating is good simultaneously, also be to affect the key that can dam fill fast, aspect impermeable soil, the height of water content also becomes the key that can dam fill fast, therefore, improve and cautiously carry out material field countercheck and again the work of surveying seem particularly important, doing material field countercheck and reserves well calculates.
For ensureing the fast rise in core-wall district, after dam counter-dam nearby position suit measures to local conditions be provided with clay, filter material deposit stock ground, solved preferably clay material rainy day and night can not exploit and transport and be difficult to meet the problem of filling intensity.
In dam upstream, stockpile charge make-up area is set, the building stones that enrockment stock ground is exploited out are in earlier stage laid in and later-stage utilization, exploit out as early as possible the material source that intensity grating meets the fill placement technique requirement of the main rockfill area of dam, both solved stockpile top material source and can not meet the problem that requirement is filled in main rockfill area, the stockpile that exploit out early stage fully utilizes and has avoided increase investment problem in the later stage.
3) adopt steel slab bridge to solve across core wall construction difficult point
In dam facing subregion continuous productive process, lay special stress on is the construction of impermeable soil, be subject to many-sided impact, impermeable soil directly restricts the rising of dam integral body, at impermeable soil, fill in continuous productive process, according to the needs that fill, should fill region and carry out continuous productive process analysis according to actual conditions classifying rationally, and adjust in time according to plant equipment and the situation of filling, passing through on core-wall, employing is rockfilled on impermeable soil upper berth and is cut and geotextiles, the steel slab bridge of weighbridge repacking for laying, the construction methods such as pad a tree, used in making timber for boats wood, invest little, easy-to-use, that has greatly improved dam body fills rising intensity, in filling fast, play very effectively effect.Steel slab bridge forms by 3, can adopt loop wheel machine and excavator to move, and the every rising 1.0m of clay filling steel slab bridge need move once, avoids rolling for a long time causing clay shear failure.
4) adopt moving detection vehicle to carry out fast detecting
For guaranteeing job site impermeable soil exploitation material and the fast detecting of filling material, guarantee that material source grating and moisture content meet design and code requirement, guarantee engineering construction quality, promote engineering construction progress, adopt moving detection vehicle within 24 hours, to serve job site.In moving detection vehicle, configure micro-wave oven, Nucleus Density Apparatus and routine test equipment.Than methods such as traditional alcohol combustion method, dry stir-fry method, baking oven baking, infrared lamp bakings, greatly shorten sample time, for filling fast, provide foundation.
5) earth core material adopts the mode that flat stone roller and protruding stone roller combine
Rational allocation rolling apparatus, carries out to earth core material the field compaction test that a series of flat stone rollers and protruding stone roller combine.Clay filling has intensive feature on the period, and the speed rolling is directly determining the speed of filling to a certain extent.Schedule requirement, need configuration protruding stone roller how as far as possible, but in economic benefit, because protruding stone roller just fills use for earth core material, non-the filling in the period of core-wall in rainy season, a large amount of protruding stone rollers are idle.Therefore adopt flat stone roller and mode that protruding stone roller combines, give full play to the intrinsic advantage of equipment, most synergy greatly possibly.In the flat affluence of grinding, not enough normally the filling in the period of protruding stone roller, according to test parameters, first moves and grinds 4 times with flat stone roller, then grinds 6 times with protruding stone roller is moving, can reach the good rolling effect that obtains.When rainy season construction, if find weather rainfall at once, adopt first protruding stone roller to put down afterwards and grind or all with the flat airtight surface of clay of mode grinding, make it the light face that formation is beneficial to suitable slope draining, reduce rainwater and permeate downwards, avoid or reduce rainy season and fill the phenomenon generation of filling out shorter and shorter in dam.
Below be only the preferred embodiment of the present invention, it should be pointed out that above-mentioned preferred embodiment should not be considered as limitation of the present invention, protection scope of the present invention should be as the criterion with claim limited range.For those skilled in the art, without departing from the spirit and scope of the present invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. the quick filling construction method of Clay Core Wall Rockfill Dam dam body, is characterized in that:
1) core wall rockfill dam is divided into 9 Ge great districts, according to Parallel to the flow direction, is followed successively by from top to bottom: ballast district, upstream, rockfill area, upstream, upstream transition district, filtration area, upstream, earth core district, filtration area, downstream, downstream transition region, rockfill area, downstream, kentledge district, downstream;
2) rockfill area, dam foundation upstream and downstream foundation excavation completes and carries out afterwards by inspection dam embankment construction; Dam embankment in earlier stage, first carry out bedding material and horizontal reverse filtrate and corresponding composite geo-membrane installation and the material construction of rockfill area, upstream and downstream thereof under basis, rockfill area, upstream and downstream, after river-bed section earth core district scope based process, irrigation gallery concrete construction complete, carry out irrigation gallery top following position earth core and highly plastic clay construction; Then according to the subregion of core wall rockfill dam, carry out the full section of normal dam body and fill, rise overally to dam crest reclamation level.
2. the quick filling construction method of Clay Core Wall Rockfill Dam dam body according to claim 1, it is characterized in that, first the program of filling in earth core district for filling the sole filtrate of redressing, hearting both sides filter material again, then hearting material, every layer of core-wall material rolls with a same layer filter material simultaneously, put down rising; One deck Transition Materials rises after 2 layers of filter material of every rising and core-wall material; In the scope of the wide 30m in upstream and downstream, stockpile fills rising with core-wall district, every rising 2 floor in the core-wall district 1 floor stockpile that simultaneously rises, and rising is filled in circulation successively.
3. the quick filling construction method of Clay Core Wall Rockfill Dam dam body according to claim 2, is characterized in that, described earth core is divided into highly plastic clay material district and earth core material district.
4. the quick filling construction method of Clay Core Wall Rockfill Dam dam body according to claim 3, is characterized in that, described highly plastic clay material district and earth core material district unit construction sequence of dam embankment are:
1) fill unit plane survey,
2) after base surface acceptance(check), fill the measurement of sideline, unit, unwrapping wire,
3) charging, discharging, control earth material water content,
4) flat material, layer thickness control,
5) padfoot roller rolls,
6) roll quality examination, sampling,
7) after acceptance(check), enter next unit and fill, check and accept the defective step 5) of returning.
5. the quick filling construction method of Clay Core Wall Rockfill Dam dam body according to claim 4, it is characterized in that, the concrete construction method in described earth core district is: clay material is divided into unselected clay and highly plastic clay, near gallery both sides 2.5m scope, it is highly plastic clay, near cover plate 3.0m scope, it is highly plastic clay, remainder is unselected clay, clay material two work planes of minute upstream and downstream below gallery crest level fill, stride across and form one after gallery and fill work plane, clay material and dam body foundation face contact site first fill dam foundation filter material, then lay geomembrane, on geomembrane top, start to fill clay material, earth core material filling construction first carries out dam foundation filter material and fills, and then lays geomembrane, then measures unwrapping wire, finally carries out clay material and fills, clay material fills and frontly first material source is carried out to measurement of water-content coefficient, clay filling adopts attacks and occupies method construction, first the one end by surface of filling starts material loading, form material loading platform, platform height is controlled in strict accordance with the thick standard of loose laying, after large stone of clay completes, measurement is emitted and is rolled reference line, roll the parallel axis of dam of reference line, spacing 4m, adopt the parallel axis of dam direction of 20T padfoot roller exciting to roll, clay adopts advance and retreat mistake to roll apart from method, unselected clay rolls 8 times, wrong apart from 26cm, highly plastic clay rolls 6 times, near cover plate concrete 1.0m distal part position, adopt the quiet stone roller of vibrating roller 6 times, before highly plastic clay fills, gallery and the watering of cover plate concrete surface of the contact of Ying Yu highly plastic clay are moistening, and brush dense clay slip, the compacting of Pu Tu limit, limit, clay slip brushing height should be consistent and be connected with bottom coating with paving soil thickness, repaves soil and compacting after forbidding clay slip to dry up, clay is with water quality than being 1:2.5～1:3.0, and viscosity is as the criterion with wall built-up, coating layer thickness 3～5mm, and core-wall is from the second layer bankets, and the highly plastic clay contacting with cover plate should be prior to carrying out making with layer earth material.
6. the quick filling construction method of Clay Core Wall Rockfill Dam dam body according to claim 1, is characterized in that, stockpile district, Transition Materials district and unit construction sequence of filtration area dam embankment are:
A) fill unit plane survey,
B) after base surface acceptance(check), fill the measurement of sideline, unit, unwrapping wire,
C) charging, discharging, during charging at dam external adding water,
D) flat material, layer thickness control,
E) supplement watering,
F) roll,
G) roll quality examination, after acceptance(check), enter next unit and fill, check and accept the defective step f) of returning.
7. the quick filling construction method of Clay Core Wall Rockfill Dam dam body according to claim 1, it is characterized in that, described filtration area is used filter material to fill, upstream and downstream filtration area is by F1, F2Liang Ge district forms, upstream F1, each 3.0m of F2 is wide, downstream F1, each 4.0m of F2 is wide, filter material is by the stock ground processing of natural sand gravel, the earth material content that is less than 0.075mm is not more than 5%, filter material fills front elder generation and carries out setting-out according to design size, filter material and adjacent clay material, Transition Materials boundary is clearly demarcated, sprinkling French chalk carries out and fills reference line, filling of filter material should have been put down rising with core wall filling building face, loaded filter and core-wall junction should adopt smooth drum vibratory roller to roll across seam, when loaded filter is connected with core-wall, adopt zigzag to fill, and making core-wall after first making filter material, when loaded filter is connected with Transition Materials, adopt equally zigzag to fill, when filter material fills, must keep moisture state, the F1 filter material that stock ground has just been produced must dewater, and adds water-wet before rolling, and amount of water is to reach wettability effect.
8. the quick filling construction method of Clay Core Wall Rockfill Dam dam body according to claim 7, is characterized in that, described transition region is filled with Transition Materials, and the wide 12m of Transition Materials adopts bursting charge, and maximum particle diameter is not more than 300mm; Be less than the granule content of 5mm in 15%～25% scope, and D15≤20mm, the transmission coefficient after Transition Materials compacting should be greater than 5 * 10
-2cm/s, the granule content that is less than 0.075mm is not more than 5%; Transition Materials loose laying depth 63cm, 56cm after compacting, compacted depth and filter material match; Transition Materials fills and adopts the method for attacking and occupying to fill, and first adopts excavator that the oversize stone with F2 contact site and concentrated piece stone are removed totally, and adopt the levelling of microlith slag charge after stone completes, and watering rolls; To strengthening the junction of the edges of two sheets of paper with F2 contact site, roll.
9. the quick filling construction method of Clay Core Wall Rockfill Dam dam body according to claim 1, is characterized in that, stockpile district adopts stockpile to fill, and stockpile maximum particle diameter is not more than 800mm, and the granule content that is less than 5mm should be controlled at 10%～25%; The granule content that is not more than 0.075mm should be not more than 5%, and nonuniformity coefficient is greater than 10, and transmission coefficient is greater than 5 * 10
-2cm/s; Stockpile fills to adopt and attacks and occupies method, retreat method or mixing method is filled; Stockpile fills loose laying depth 1.0m; Stockpile is sprinkled water before rolling, and the amount of water of stockpile is 10%～25%.
10. the quick filling construction method of Clay Core Wall Rockfill Dam dam body according to claim 1, it is characterized in that, the junction construction sequence in ballast district, dam embankment upstream, rockfill area, upstream, upstream transition district, filtration area, upstream, earth core district, filtration area, downstream, downstream transition region, rockfill area, downstream, kentledge district, downstream is:
1) stockpile within the scope of core-wall material, filter material, Transition Materials and 30m has been put down rising;
2) first carry out the 1st layer of filter material and 2 layers of core-wall material and fill,
3) carry out again the 2nd layer of filter material and 2 layers of core-wall material and fill,
4) then carry out the 1st layer of Transition Materials and the 1st layer of stockpile fills;
5) the 2nd layer of filter material rolls together with the 1st layer of Transition Materials, stockpile with core-wall material,
6) rising is filled in circulation successively.
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