CN106894389A - A kind of new seepage prevention system and structure for being applicable deep covering layer earth and rockfill dam - Google Patents
A kind of new seepage prevention system and structure for being applicable deep covering layer earth and rockfill dam Download PDFInfo
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- CN106894389A CN106894389A CN201510944674.1A CN201510944674A CN106894389A CN 106894389 A CN106894389 A CN 106894389A CN 201510944674 A CN201510944674 A CN 201510944674A CN 106894389 A CN106894389 A CN 106894389A
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- dam
- covering layer
- prevention system
- seepage prevention
- seepage
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/16—Sealings or joints
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B7/00—Barrages or weirs; Layout, construction, methods of, or devices for, making same
- E02B7/02—Fixed barrages
- E02B7/04—Dams across valleys
- E02B7/06—Earth-fill dams; Rock-fill dams
Abstract
The present invention relates to building engineering field, be directed to existing earth and rockfill dam high it is single based on complex structural designs, difficulty of construction existing for vertical seepage prevention system be huge, capital intensive, construction quality ensure that the more difficult, runtime haves the shortcomings that risk etc. is main, propose a kind of new seepage prevention system and structure for being applicable deep covering layer earth and rockfill dam.It is included in dam foundation while be provided with leakage preventing structure vertically with horizontal direction, untill the cut-pff wall of in the vertical direction and grout curtain extend to the depth that antiseepage requirement is met below stratum；Updrift side at dam foundation ground elevation is provided with horizontal impervious layer, crosses to form tight impervious body near the axis of dam to leakage preventing structure to level vertically, and set level to drainage blanket along ground elevation in dam foundation downstream.Orthogonal space seepage prevention system of the present invention has distinct specific aim feature：Structure design is uncomplicated, difficulty of construction is little, investment relatively saving, construction quality guarantee degree is high, operation risk is small.
Description
Technical field
One kind the invention belongs to building engineering field, more particularly to hydraulic engineering is applicable deep covering
The new seepage prevention system and structure of cap rock earth and rockfill dam.
Background technology
Since the nineties in last century, China's economy and society development increasingly increases to the demand of the energy
It is long, wherein the reproducible cleaning energy based on water power is China's economic society Green Development
There is provided natural excellent condition.China, the water power of China are seen in one time, world's hydroelectric development
Southwest is seen in exploitation, and having for national strategy to develop western regions is caught in the southwestern province with Sichuan as representative
Sharp opportunity, in Yangtze river basin upstream Jinsha jiang River, Yalongjiang River, Jia Lingjiang River and Lancang, yunnan river, expensive
The hydroelectric development of the great rivers such as the state Wujiang River, the Tibet Yarlung Zangbo River is in the ascendant.These rivers
Two sides are steep, river is profoundly rapid, contain the hydraulic power potentials of very abundant, a collection of with high dam
Big storehouse is that large-scale, the Huge Power Station of mark are constructed and put into operation one after another, as local economic development and
The key power generation source of " transferring electricity from the west to the east ".From current analysis of statistical data, southwest is big
The big storehouse of high dam in partial rivers is in the majority with earth and rockfill dam, and riverbed all generally existings where dam site
Deep covering layer, and layer of structure is complicated, builds 100m grades and the above on such ground
Earth and rockfill dam high, its osmotic control and leakage preventing structure are safely one with of overall importance, key
, systematic technical barrier, can the crucial difficulty of earth and rockfill dam design and construction high is that
Formed together safe and effective seepage proof curtain, it is ensured that reservoir in the safe and reliable of longtime running,
Otherwise, dam is caused because seepage prevention system goes wrong, will causes catastrophic to downstream
Destruction and catastrophic loss.It is current to 100m and with higher level's earth and rockfill dam high (including gravel matter class clay
Core wall rockfill dam and rockfill dam with asphalt concrete core etc.), the scientific research that domestic some units are passed through
Tackling key problem and practical implementation, have taken incremental advances.Current this respect research application level is most
It is high surely belong to Chengdu survey and design research institute of Chinese electricity Jian groups, Kunming survey and design research institute,
Design exploration company of the Changjiang river committee etc., these design studies mechanisms by more than ten years research with should
With, achieve a series of achievements in research, Pubugou Project (186m high), hard and infertile moraine (126m high),
(height is strangled in lion level ground (136m high), Mao Er lids (147m high), sill may long (240m high), smelting
125m), tens of seat height soil stones such as waxy common wheat (261.5m high), water cloth a strip of land between hills (233.2m high)
It is applied and promotes in dam engineering, achieves obvious scientific and technological progress and good economic effect
Benefit.By analyzing all kinds of patterns of above-mentioned earth-rock dam seepage control and leakage preventing structure safe design,
An overall feature is that all of which uses the vertical leakage preventing structure system to (single or double),
Vertically dam body seepage body (calculous soil Impervious Materials or bituminous concrete are generally to leakage preventing structure system
Core-wall) (coating top, typically can be single or double for+dam foundation coating concrete cut
Arrangement, divides main curtain and secondary curtain again during double arrangement)+dam foundation deep layer grout curtain, three sections
Impervious body also has different structure linked vector graphs (such as gallery) to form an overall seepage prevention system.
Current earth and rockfill dam antiseepage key skill design high is all according to this " Trinity " combination against seepage knot
What structure pattern was carried out.Costly, difficulty of construction is also very big, later stage treatment be also inconvenient and
It is difficult.
In the prior art relevant with the present invention
(1) deep covering layer 200m grades of high-tech zones " seepage prevention of core wall body+gallery is created
The combination against seepage design complete set technology of+concrete cut+grout curtain ", solves deep covering
Cap rock builds the key technical problem such as high-tech zones osmotic control and leakage preventing structure safety.Should
Innovation belongs to hydraulic engineering, hydraulic structure subject.This achievement has been successfully applied to waterfall
The engineerings such as rockfill dam with asphalt concrete core high are strangled in ditch native core wall rockfill dam high, smelting.Circumstantial evidence
For：
①《Scientific and technological achievement assay certificate》；
②《High-tech zones seepage control system key technology research and application on deep covering layer》
Project research report；
3. monograph,《Pubugou Hydropower Station volume Two civil engineering》(grant number ISBN
978-7-5084-6979-9)；
4. patent, " earth-rock dam deep-base seepage-control water-stopping structure for water conservancy and hydropower project " (patent No.：
ZL 2007 1 0203303.3)；
5. patent, a kind of " soil property core-wall structure " (patent No.：ZL 2014 2 0719396.0)；
6. patent, " cover plate dam foundation trigonum curtain structure " (patent No.：ZL 2012 2
0688778.2)；
7. paper,《Pubugou Hydropower Station gravelly soil Design of rockfill dam with earth core》Hydroelectric generation, 2010,
No.6；
8. paper,《High-tech zones dam foundation impervious wall is studied with core-wall connection scheme》The Changjiang river
Institute of the academy of sciences reports, and 2010, No.9；
(2) innovation proposes cut-pff wall vertical fragmentation joint leakage preventing structure pattern, cut-pff wall point
Upper and lower two-layer construction, it is middle to be connected by gallery, solve deep covering layer ultra-deep cut-pff wall
Cannot once into the technical barrier of wall.The innovation belongs to hydraulic engineering, hydraulic structure subject.
This achievement has been successfully applied to covering and deep up to 420m's both at home and abroad without engineering precedent
Engineering is strangled in smelting.Circumstantial evidence is：
①《Scientific and technological achievement assay certificate》；
②《High-tech zones seepage control system key technology research and application on deep covering layer》
Project research report；
3. monograph,《Hydropower Project construction technology is strangled in smelting》(grant number ISBN
978-7-5083-6915-0)
4. patent, " for the impervious watertight structure in Hydraulic and Hydro-Power Engineering " (patent No.：ZL
2006 1 0021297.5)
5. patent, " embankment seepage preventing structure " (patent No.：ZL 2006 2 0034777.0)
6. patent, a kind of " dam foundation gallery attachment structure " (patent No.：ZL 2014 2
0750462.0)
7. paper,《The design of power station preventing seepage handling of base of a dam is strangled in smelting》Hydroelectric generation, 2004,
No.11；
8. paper,《Hydropower station pivotal layout design is strangled in smelting》Sichuan hydroelectric generation, 2003, No.4；
(3) the big spacing of the dam foundation, double cut-pff walls joint leakage preventing structure, cut-pff wall are proposed first
Gallery is respectively adopted with native core-wall and plug-in type is connected, main wall top uses with gallery and is rigidly connected
Structure, solves 200m grades high native core wall rockfill dam seepage prevention for deep covering under high water head and sets
Meter and construction technology problem.The innovation belongs to hydraulic engineering, hydraulic structure subject.This into
Fruit is applied to sill may engineering long in Pubugou Project successful Application, makes deep covering
The height of dam that soil core wall rockfill dam high is built on layer is improved to 250m grades.Circumstantial evidence is：
①《Scientific and technological achievement assay certificate》；
②《High-tech zones seepage control system key technology research and application on deep covering layer》
Project research report；
3. patent, " superelevation earth and rockfill dam cut-pff wall Liquid penetrant testing structure " (patent No. ZL 2,014 2
0441479.8)
4. patent, " core wall dam bank slope bridging type dam foundation gallery structure " (patent No.：ZL 2012
2 0388743.7)
5. patent, " high-tech zones seepage prevention of dam founda structure " (patent No.：ZL 2014 2
0752310.4)
6. paper,《Sill may dam foundation gallery stress-deformation characteristic research long》Geotechnical Engineering journal,
2011, No.11；
7. paper,《Influence of the different constitutive models to calculating cut-pff wall stress》University Of Chongqing is learned
Report, 2013, No.10；
8. paper,《Sill may core wall rockfill dam foundation anti-seepage wall stress and deformation analysis long》.Journal
Of Water Resources ＆ Water Engineering, 2008, No.3；
9. paper,《Smelting is strangled Dam core-wall and concrete pedestal design is connected with cut-pff wall》.
Hydroelectric station design, 2013, No.2；
Above-mentioned 3 prior arts of correspondence, its major defect is as follows：
(1) deep covering layer high-tech zones " seepage prevention of core wall body+gallery+concrete cut
" Trinity " the combination against seepage technology of+grout curtain " and traditional earth and rockfill dam Anti-seeping technology skill
Art is come down in a continuous line, and is substantially still vertical single seepage proof curtain structure, only in depth and
Changed on material." earth and rockfill dam is how high, and intratectal seepage prevention system should just have how deep "
This traditional thinking mode has to be made moderate progress by the innovation of construction technology.But could not
Recognize, once this unidirectional or single leakage preventing structure is subjected to external force destruction (such as earthquake)
Cannot then repair.Therefore, the combination against seepage structural system of single " Trinity " formula
Larger operation risk is still present.
(2) due to the Traditional Thinking of " dam is how high, and seepage prevention system is just how high ", so produce
" Trinity " combination against seepage technology of complexity has been given birth to, thus when leakage preventing structure is constructed, no
The two-layer that must make no distinction of rank is carried out, the middle structure design connected with gallery, seepage prevention of dam founda system depth
Degree accounts for 0.8-1.2 times of height of dam, causes construction costs sufficiently expensive, and many water are close in such as Tibet
Storehouse height of dam only 72.3m, but seepage prevention for deep covering wall treatment depth reaches 158m, seepage prevention of dam founda body
It is that construction cost accounts for 1.6-1.9 times that dam construction fills cost.Yele, Sichuan Province power station
Big height of dam 125m, its coating treatment uses cut-pff wall and each deep 100m of grout curtain, its antiseepage
Treatment scale is huge.
(3) according to the conventional thought of vertical antiseepage, carried out using the double curtain for relatively having new meaning
Anti-seeping technology, gallery is respectively adopted with native core-wall for cut-pff wall and plug-in type be connected, main wall top and
Gallery uses rigid connection structure, and this design comparison is complicated, and difficulty of construction is big and long in time limit,
Some projects need to be larger across 2-3 flood season construction, flood control safety risk.In general underground
The construction one of structure leans on fund by conscience two by technology three, and three is indispensable, deep covering layer
The difficulty of ultra-deep cut-pff wall quality control is larger, it is necessary to level professional technology higher and excellent
Appointed condition, the construction technology of this coating Anti-seeping technology is sufficiently complex, and difficulty is too big, non-
General construction enterprises to be.
The content of the invention
The present invention for above-mentioned deep covering layer earth and rockfill dam high it is single based on vertical seepage prevention system
Existing complex structural designs, difficulty of construction are huge, the guarantee of capital intensive, construction quality is more difficult,
Runtime haves the shortcomings that risk etc. is main, proposes that one kind is equally applicable to deep covering layer soil high
The orthogonal space seepage prevention system and its structure of masonry dam.Orthogonal space seepage prevention system has distinct pin
To property feature：Structure design is uncomplicated, difficulty of construction is little, investment is relatively saved, construction quality
Guarantee degree is high, operation risk is small.
To achieve these goals, the technical solution used in the present invention is：
A kind of new impermeable system and structure for being applicable deep covering layer earth and rockfill dam, in Dam
Be provided with leakage preventing structure vertical with horizontal direction in base simultaneously, the cut-pff wall of in the vertical direction and
Untill grout curtain extends to the depth that antiseepage requirement is met below stratum；In dam foundation ground elevation
The updrift side at place is provided with horizontal impervious layer, vertically to attached in the axis of dam to leakage preventing structure with level
Inbreeding converges, and sets level to drainage blanket along ground elevation in dam foundation downstream.
Described impervious barrier cross-directional length is the distance between dam bottom and cut-pff wall.
Described vertical impervious barrier is one or more.
Described impervious barrier uses grout curtain antiseep.
Useful achievement of the invention：The present invention simplifies and optimizes conventional leakage preventing structure system,
Earth and rockfill dam dam body and dam foundation orthogonal space seepage prevention system are formed, changes that " dam is how high, antiseepage
System just it is how high " traditional design mode.Upstream horizontal leakage preventing structure is increased in the present invention
L1With downstream horizontal row water body L2, this is easily done in construction, vertical seepage control structure
H (or h1, h2) difficulty of construction greatly reduced, and reliability is also greatly improved, and is applied
Working medium amount can effectively be ensured.Covered deep because the present invention program has effectively avoided
Difficulty and costly cut-pff wall or Curtain Grouting Construction are carried out in cap rock, thus its economy can
Row is also apparent from.In addition, technical solution of the present invention has also promoted industry scientific and technological progress,
Promote application study.
Brief description of the drawings
Fig. 1 is the structural representation of embodiment one；
Fig. 2 is the structural representation of embodiment two.
Specific embodiment
With reference to embodiment, the present invention will be further described.
Embodiment one
As shown in figure 1, a kind of new seepage prevention system and structure for being applicable deep covering layer earth and rockfill dam,
Leakage preventing structure is that increased horizontal leakage preventing structure L with conventional structure significant difference1.Using
Multiple tracks vertical seepage control structure h1, h2, one layer of displacement hull is arranged in the horizontal direction in core-wall downstream
L2, open up to downstream drainage rib body.The relation of each structure of seepage prevention system as shown in Figure 1 is such as
Under：①h1+h2≤B；2. vertical seepage control body h1, h2There are three kinds of relations according to different situations
h1≤h2, h1=h2, h1＞ h2；③L1≥L2And L1+L2≤L。
Embodiment two
As shown in Fig. 2 the present embodiment is with the difference of embodiment one, one also can be only used
Road vertical seepage control structure h, each structural relation is shown in Fig. 2：①L1≥L2And L1+L2≤L；
2. h≤(0.5~1.0) B.
Theoretical foundation：Should meet seepage stability for the design of deep covering layer high dam foundation leakage preventing structure
Requirement, to a Dam Foundation Seepage analysis point the following two kinds situation.1. when Dam Foundation Seepage characteristic is uniform,
During isotropism (such as simple sand gravel coating), osmotic pressure herd function H meets drawing
Laplace equation
In formula, x, y are the plane geometry coordinate of seepage field.
2. when dam foundation Penetration Signature has obvious two to difference, i.e. horizontal direction osmotic coefficient kxIt is more than
Vertically to osmotic coefficient ky(such as coating layering, be made up of the material of different attribute),
This is appropriate to the occasion to be substituted for seepage field original horizontal coordinate xLaplace equation expression formula is：
In this case seepage field infiltration coefficient is：
According to the seepage flow drift net (as shown in Figure 1, 2) drawn based on Laplace's equation, it is necessary to enter
Row seepage stability checking calculation and accordingly design level and vertical seepage control structural shape and size.Appoint
Infiltration gradient J, the seepage velocity at one grid (setting its average width Δ s equal with average Δ l long) place
The flow Δ q such as following formulas of stream band are obtained where v and the grid：
It is dam foundation tunneling boring list seepage discharge q wide that seepage field amounts to m stream band flow sum,
The osmotic pressure head of any point can be tried to achieve by following formula under the dam foundation：
Either horizontal leakage preventing or vertical seepage control structure should all make any point in dam foundation coating
Hydraulic slope be less than its exit gradient, if this requirement can not be met, seepage prevention system just should
It is adjusted, untill requirement is met.
The present invention program is that so-called orthogonal space leakage preventing structure system overcomes and covered deep in the past
That builds that earth and rockfill dam high used on cap rock is single vertical to " Trinity " leakage preventing structure body
System, and also sets up dam foundation horizontal leakage preventing structure in the horizontal direction, thus with vertical direction on
Leakage preventing structure (this is traditional pattern) formed be complementary to one another and tight orthogonal space antiseepage
System.At present, the earth and rockfill dam built according to this thinking is not yet completed, and is awaited in engineering reality
Further research and application in trampling.Built on deep covering layer using orthogonal space seepage prevention system
The general procedure of earth and rockfill dam high is：
A) carry out necessary dam foundation cleaning (prior art specification is distinctly claimed)；
B) l is carried out1Upstream horizontal impervious layer and l2The construction of downstream horizontal row water layer, while carrying out h
Cut-pff wall or seepage proof curtain are constructed (during single vertical seepage control system) or h1With h2Impervious wall construction
(during double vertical seepage control)；
C) it should be specifically noted that l in construction technology1With h (or h1、h2) (i.e. horizontal leakage preventing with it is vertical
Antiseepage) in the antiseepage quality of its binding site, will otherwise turn into the weak link of seepage prevention system.
D) carry out earth and rockfill dam to fill, this part construction technology is than more conventional, upstream and downstream enrockment dam shell
Material, centre is Impervious Materials, should keep good antiseepage overall performance.
General principle of the invention, principal character and of the invention excellent has been shown and described above
Point.It should be understood by those skilled in the art that, the present invention is not limited to the above embodiments, on
Merely illustrating the principles of the invention described in embodiment and specification is stated, the present invention is not being departed from
On the premise of spirit and scope, the simple change and replacement of those ordinary skill in the art are all
It is within protection scope of the present invention.
Claims (4)
1. a kind of new seepage prevention system and structure for being applicable deep covering layer earth and rockfill dam, its feature exists
In：Leakage preventing structure vertically with horizontal direction is provided with simultaneously in dam foundation, in vertical direction
On cut-pff wall and grout curtain extend to the depth that antiseepage requirement is met below stratum untill；
Updrift side at dam foundation ground elevation is provided with horizontal impervious layer, vertically to level to antiseepage knot
Structure crosses near the axis of dam, and sets level to drainage blanket along ground elevation in dam foundation downstream.
2. a kind of new impervious body for being applicable deep covering layer earth and rockfill dam according to claim 1
System and structure, it is characterised in that：Described impervious barrier cross-directional length be dam bottom with it is anti-
Ooze the distance between wall.
3. it is according to claim 1 and 2 a kind of to be applicable the new of deep covering layer earth and rockfill dam
Seepage prevention system and structure, it is characterised in that：Described vertical impervious barrier is one or more.
4. a kind of new antiseepage for being applicable deep covering layer earth and rockfill dam according to claim 3
System and structure, it is characterised in that：Described impervious barrier uses grout curtain antiseep.
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| CN201510944674.1A CN106894389A (en) | 2015-12-18 | 2015-12-18 | A kind of new seepage prevention system and structure for being applicable deep covering layer earth and rockfill dam |
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Family
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110184999A (en) * | 2019-05-05 | 2019-08-30 | 广州中寓建设工程有限公司 | A kind of anti-seepage reinforcing technique of hydraulic engineering dam foundation |
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| CN101200885A (en) * | 2007-12-21 | 2008-06-18 | 中国水电顾问集团成都勘测设计研究院 | Earth-rock dam deep-base seepage-control water-stopping structure for water conservancy and hydropower project |
| CN102660936A (en) * | 2012-05-29 | 2012-09-12 | 中国水利水电第十四工程局有限公司 | Method for realizing seepage prevention of bridge wall by means of polyvinyl chloride film |
| CN102979061A (en) * | 2012-12-04 | 2013-03-20 | 合肥工业大学 | Oblique membrane core wall earth and rockfill dam and anti-seepage body construction method thereof |
| CN204125921U (en) * | 2014-09-29 | 2015-01-28 | 闵志华 | A kind of from the impermeable dam of backwater |
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2015
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09125347A (en) * | 1995-10-31 | 1997-05-13 | Hazama Gumi Ltd | Building method of dam |
| CN101200885A (en) * | 2007-12-21 | 2008-06-18 | 中国水电顾问集团成都勘测设计研究院 | Earth-rock dam deep-base seepage-control water-stopping structure for water conservancy and hydropower project |
| CN102660936A (en) * | 2012-05-29 | 2012-09-12 | 中国水利水电第十四工程局有限公司 | Method for realizing seepage prevention of bridge wall by means of polyvinyl chloride film |
| CN102979061A (en) * | 2012-12-04 | 2013-03-20 | 合肥工业大学 | Oblique membrane core wall earth and rockfill dam and anti-seepage body construction method thereof |
| CN204125921U (en) * | 2014-09-29 | 2015-01-28 | 闵志华 | A kind of from the impermeable dam of backwater |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110184999A (en) * | 2019-05-05 | 2019-08-30 | 广州中寓建设工程有限公司 | A kind of anti-seepage reinforcing technique of hydraulic engineering dam foundation |
| CN110184999B (en) * | 2019-05-05 | 2021-01-05 | 广州中寓建设工程有限公司 | Seepage-proofing reinforcing process for dam foundation of hydraulic engineering dam |
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Application publication date: 20170627 |