CN104612108A - Construction technology for large hidden crack of leaking stoppage dam foundation - Google Patents
Construction technology for large hidden crack of leaking stoppage dam foundation Download PDFInfo
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- CN104612108A CN104612108A CN201510018074.2A CN201510018074A CN104612108A CN 104612108 A CN104612108 A CN 104612108A CN 201510018074 A CN201510018074 A CN 201510018074A CN 104612108 A CN104612108 A CN 104612108A
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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
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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Abstract
The invention discloses construction technology for a large hidden crack of a leaking stoppage dam foundation. The technology includes the following steps of drilling and survey; drilled hole washing and simple water pressing; grout preparation; grouting; hole opening gravel and coarse sand washing and filling, wherein leakage stoppage grout comprises early-stage low-density expansive type leakage stoppage grout and rear-stage high-density sealing type leakage stoppage grout. By the adoption of the construction technology, a bridging leakage stoppage method and a chemical leakage stoppage method are combined, the large crack is sealed through the expansion characteristic and the sealing characteristic of the leakage stoppage grout, construction efficiency is high, a construction period is short, and cost is low.
Description
Technical field
The invention belongs to Base of Dam of Reservoir or other Rock And Soils inside leakage stopping technology field containing hidden large fracture, be specifically related to the construction technology of the hidden large fracture of a kind of leak stopping dam foundation.
Background technology
The economic development of hydraulic engineering to China plays very important effect, not only can flood control and disaster reduction, can also provide water source for agricultural production and industrial water use, the relationship between quality of therefore hydraulic engineering, to the people's lives and property, is the problem of various circles of society's extensive concern.The frequent produced problem of hydraulic engineering has that seepage, engineering equipment are aging, working procedure management imperfection, quality information feedback system are unsound.Wherein, leakage problems is the most serious also the most difficult, the concentrative seepage problem that especially under dam foundation stratum, large fracture is formed.
At present, method mainly bridge joint leak stopping and the chemical plugging that leak stopping is conventional.Conventional bridge joint blocking method is according to Size of Crack, leak-off velocity, by hard particle materials, as sheet, fiber, powdery bridge formation come leak stopping crack, forms mechanical blockage, reach the object of leak stopping under pressurization squeezing action.Bridge joint leak stopping cost is low, be widely used, but due to loss circulation material self not yielding and cause leak stopping success rate low.Chemical plugging is mainly according to high polymer generation chemical reaction, and self can deformed dilation thus play the effect of leak stopping.Although chemical plugging is effective, high relative to bridge joint blocking method risk, cost is also high.
Summary of the invention
The present invention is directed to above-mentioned weak point and the construction technology of the hidden large fracture of a kind of leak stopping dam foundation provided, bridge joint blocking method and chemical plugging combine by this technique, utilize the expansion of leak stopping slurry and sealing feature to block large fracture, make efficiency of construction high, duration is short, and cost is low.
For achieving the above object, the technical solution adopted for the present invention to solve the technical problems is:
A construction technology for the hidden large fracture of the leak stopping dam foundation, comprises the following steps:
(1) boring and deviational survey
With the boring of geology slewing drilling machine, before perforate, adopt two-point method earth anchorage, correct rig vertical shaft with bevel protractor and circumferentor;
(2) bore flushing and simple and easy setting-out
Adopt water under high pressure pulsation to rinse, washing time is 30-60min, then returns clear water 10min; All carry out simple and easy packer permeability test before grouting, ensure that setting-out pressure is 1.0MPa;
(3) slurrying
Leak stopping slurry comprises low-density expanded type leak stopping in early stage and starches and later stage high-density sealed type leak stopping slurry;
Wherein, low-density expanded type leak stopping in early stage slurry is made up of the component of following parts by weight: composite filler 3-5 part, composite consolidation agent 4-5 part, Sodium Polyacrylate crosslinked copolymer particles 2.5-3 part, flax fiber 5-6 part, sawdust 0.5-1 part, water 80-85 part; Each component weighed by its parts by weight, mix, after wet milk grinds, send into agitator, then add UNF-5 type high efficiency water reducing agent, UNF-5 type high efficiency water reducing agent accounts for the 7%-9% of said components gross weight, obtains low-density expanded type leak stopping in early stage slurry;
Later stage high-density sealed type leak stopping slurry is made up of the component of following parts by weight: portland cement 20-30 part, Sodium Polyacrylate crosslinked copolymer particles 5-10 part, flax fiber 5-15 part, medium sand 15-20 part, water 5-10 part; Each component weighed by its parts by weight, mix, after wet milk grinds, send into agitator, then add UNF-5 type high efficiency water reducing agent, UNF-5 type high efficiency water reducing agent accounts for the 7%-9% of said components gross weight, obtains later stage high-density sealed type leak stopping slurry;
Wherein, sawdust is fallen particulate matter in timber process;
(4) be in the milk
First fill with low-density expanded type leak stopping in early stage slurry, carry out the perfusion of later stage high-density sealed type leak stopping slurry after 4 hours, filling limit, limit adds 20-30% fine sand in hole, until slurry is returned in aperture;
(5) gravel, coarse sand are filled with in aperture punching
With clear water in aperture in hole first backlash fill with gravel, coarse sand until blocking channel.
Further, Sodium Polyacrylate crosslinked copolymer particles used in step (3), its preparation method comprises the following steps:
1. by acrylates: water is the ratio mixing of 1:4 in mass ratio, makes acrylic acid brine solution;
2. by NaOH: acrylic acid: water is the ratio mixing of 1:2:5 in mass ratio;
3. by sodium peroxydisulfate or ammonium persulfate: water is the ratio mixing of 1:14 in mass ratio;
4. by step 1. in the acrylic acid brine solution that obtains and step 2., the solution equal-volume that 3. obtains of step mixes to be placed in stainless steel reactor and reacts 40-60min, reaction temperature is 75 DEG C, obtains gel state fluid;
5. gel state fluid and fineness modulus be the medium sand of 3.0 in mass ratio for the ratio of 1:8 mix, obtain containing sand colloid;
6. will containing in sand colloid injected plastic mould, mould eyelet is of a size of the square groove of 3-10mm, and mould is placed on outdoor airing, dry at normal temperatures, can obtain foursquare Sodium Polyacrylate crosslinked copolymer particles after the demoulding;
Further, composite filler used in step (3) is polyflon, and composite consolidation agent is that first is coagulated.
Further, in step (3), sawdust particle diameter used is 8-10mm.
Further, the length of flax fiber used in step (3) is 3-5cm.
Further, in step (3), medium sand particle diameter used is 0.35-0.5mm.
Further, the absolute viscosity of step (3) mid-early stage low-density expanded type leak stopping slurry and later stage high-density sealed type leak stopping slurry is 115-120mPas.
Further, in step (4), fine sand particle diameter used is 0.1-0.25mm.
Further, grain size of gravel used in step (5) is 2-5mm, and the particle diameter of coarse sand is 0.5-2mm.
The construction technology of the hidden large fracture of a kind of leak stopping dam foundation provided by the invention has following beneficial effect:
(1) material of the present invention is simple, main with portland cement, Sodium Polyacrylate cross-linked copolymer, sand, flax fiber is material, prepare the slurry of low-density expanded type leak stopping in earlier stage and the high-density sealed type leak stopping in later stage slurry, low-density expanded type leak stopping in early stage slurry has stronger shut-off capacity and fills reinforcement ability, can shutoff serious thief zone, the bearing capacity of low-pressure stratum can be improved again, later stage high-density sealed type leak stopping slurry possess very strong retentivity and shut-off capacity high, in earlier stage low-density expanded type leak stopping slurry and the high-density sealed type leak stopping in later stage slurry combine can block hidden large fracture gap effectively, mortar leakage prevention.
(2) bridge joint blocking method and chemical plugging combine by this technique, by first filling with the rear technique of filling with later stage high-density sealed type leak stopping slurry of low-density expanded type leak stopping in early stage slurry, crack can be solved comparatively large and have the problem that current are logical, it is high that this technological process has efficiency of construction, duration is short, low cost and other advantages.
Accompanying drawing explanation
Fig. 1 is the construction flow chart of the hidden large fracture of the leak stopping dam foundation of the present invention.
Detailed description of the invention
Plugging mechanism: low-density expanded type leak stopping in early stage slurry is injected grout hole by grouting pump, flax fiber in mixture, the size in crack can be reduced, Sodium Polyacrylate can comparatively fast be contacted with ground crack, very fast implantation, Sodium Polyacrylate expands in water, and 3-4h volume can increase 80-100 doubly, can the hidden large fracture of blocking portion; The perfusion of the high-density sealed type leak stopping slurry in later stage is carried out again after 4h, owing to also containing Sodium Polyacrylate particle in the high-density sealed type leak stopping slurry in later stage, further to expand after perfusion leak stopping, the crack that early stage does not block can be sealed, prevent spillage, simultaneously because the effect of expansion force, part Rock And Soil internal force can be offset, thus globality and the stress performance of Rock And Soil can be improve.
Below in conjunction with the accompanying drawings and the specific embodiments the present invention is described in further detail.
Embodiment
First determine the particular location that large crack exists, adopt downward grouting, namely creep into one section of note one section, repeatedly alternately until whole hole.
Concrete technology flow process is shown in Fig. 1, comprises the steps:
(1) boring and deviational survey
Adopt small-bore geology slewing drilling machine, diamond bit is holed, and adopts two-point method earth anchorage before perforate, corrects rig vertical shaft with bevel protractor and circumferentor;
(2) bore flushing and simple and easy setting-out
Adopt water under high pressure pulsation to rinse, washing time is 30-60min, then returns clear water 10min; All carry out simple and easy packer permeability test before grouting, ensure that setting-out pressure is 1.0MPa;
(3) slurrying and detection
Leak stopping slurry comprises low-density expanded type leak stopping in early stage and starches and later stage high-density sealed type leak stopping slurry;
Wherein, low-density expanded type leak stopping in early stage slurry is made up of the component of following parts by weight: sawdust 0.5-1 part that flax fiber 5-6 part that composite filler polyflon 3-5 part, composite consolidation agent first coagulate 4-5 part, Sodium Polyacrylate crosslinked copolymer particles 2.5-3 part, length are 3-5cm, particle diameter are 8-10mm, water 80-85 part; Each component is weighed by its parts by weight, mixes, after wet milk grinds, send into agitator, then add UNF-5 type high efficiency water reducing agent, UNF-5 type high efficiency water reducing agent accounts for the 7%-9% of said components gross weight, make slurries absolute viscosity be 115-120mPas, obtain low-density expanded type leak stopping in early stage slurry;
Later stage high-density sealed type leak stopping slurry is made up of the component of following parts by weight: medium sand 15-20 part that flax fiber 5-15 part that portland cement 20-30 part, Sodium Polyacrylate crosslinked copolymer particles 5-10 part, length are 3-5cm, particle diameter are 0.35-0.5mm, water 5-10 part; Each component is weighed by its parts by weight, mixes, after wet milk grinds, send into agitator, then add UNF-5 type high efficiency water reducing agent, UNF-5 type high efficiency water reducing agent accounts for the 7%-9% of said components gross weight, make slurries absolute viscosity be 115-120mPas, obtain later stage high-density sealed leak stopping slurry;
Wherein, concentration of slurry adopts standard funnel viscometer to detect; Fineness mainly adopts sedimentation, checks with laser particle analyzer;
Wherein, described Sodium Polyacrylate crosslinked copolymer particles, its preparation method comprises the following steps:
1. by acrylates: water is the ratio mixing of 1:4 in mass ratio, makes acrylic acid brine solution;
2. by NaOH: acrylic acid: water is the ratio mixing of 1:2:5 in mass ratio;
3. by sodium peroxydisulfate or ammonium persulfate: water is the ratio mixing of 1:14 in mass ratio;
4. by step 1. in the acrylic acid brine solution that obtains and step 2., the solution equal-volume that 3. obtains of step mixes to be placed in stainless steel reactor and reacts 40-60min, reaction temperature is 75 DEG C, obtains gel state fluid;
5. gel state fluid and fineness modulus be the medium sand of 3.0 in mass ratio for the ratio of 1:8 mix, obtain containing sand colloid;
6. will containing in sand colloid injected plastic mould, mould eyelet is of a size of the square groove of 3-10mm, and mould is placed on outdoor airing, dry at normal temperatures, can obtain foursquare Sodium Polyacrylate crosslinked copolymer particles after the demoulding;
(4) be in the milk
First perfusion low-density expanded type in early stage leak stopping slurry, large fracture aperture can reduce by the flax fiber in slurries, sawdust, containing sand Sodium Polyacrylate cross-linked polymer particle energy implantation fast, expands more than 100 times at short notice, shutoff large fracture;
After 4 hours, treat the abundant expansion plugging large fracture in slurries in early stage, carry out the perfusion of later stage high-density sealed type leak stopping slurry, filling limit, limit adds the fine sand that 20-30% particle diameter is 0.1-0.25mm in hole, until slurry is returned in aperture; For accelerating grout cures, avoid slurries to run off along crack too far away, can add accelerating admixture and make it solidify in slurries, wherein, accelerating admixture is the water glass of 1% or the calcium chloride of 2%-4%;
(5) gravel, coarse sand are filled with in aperture punching
With clear water in aperture in hole first backlash fill with gravel, coarse sand, make it along flow in fracture, accumulation, blocking channel, reduce speed of seepage flow, form anti-filter, set up the stagnant slurry of plasma resistance; Wherein, the particle diameter of gravel is 2-5mm, and the particle diameter of coarse sand is 0.5-2mm.
Engineer applied:
Certain dam foundation is deep covering layer ground, adopts curtain grouting, projected depth 65m.There is micro-leakage during 18m, leak fast 5m
3/ h; There is severe circulation loss when being drilled into well depth 25m, leak fast 80m
3when/h, 37m, there is the leakage of the mistake property returned, be tentatively judged as that Deposit in Limestone Fractures is missed.Adopt clear water to be drilled into by force well depth 45m subsequently, miss 821m altogether
3.During strong brill, there are 3 emptying phenomenons in 18-45m section, is judged as that Caves is missed.Successively adopt the multiple blocking methods such as bridge blinding slurry, cementing to carry out repeatedly blocking construction, due to complex formation, leakage is serious, walks construction requirement under meeting not yet for this reason.For improving lost-circulation zone bearing capacity, ensure cementing quality, the intumescent leak stopping slurry adopting the present invention to prepare carries out pressurization sealing construction to 18-45m section.
Site operation is divided into 3 stages along drilling depth: first stage 18-25m; Second stage 25-37m; Phase III 37-45m.
First stage 18-25m:
(1) preparation low-density expanded type in early stage leak stopping slurry and later stage high-density sealed type leak stopping slurry
Low-density expanded type leak stopping in early stage slurry is made up of the component of following parts by weight: composite filler polyflon 3 parts, composite consolidation agent first coagulate 5 parts, Sodium Polyacrylate crosslinked copolymer particles 2.5 parts, the length flax fiber 5 parts that is 3-5cm, particle diameter be 8-10mm 1 part, sawdust, 83.5 parts, water; Each component is weighed by its parts by weight, mixes, after wet milk grinds, send into agitator, then add UNF-5 type high efficiency water reducing agent, UNF-5 type high efficiency water reducing agent accounts for the 7%-9% of said components gross weight, make slurries absolute viscosity be 120mPas, obtain low-density expanded type leak stopping in early stage slurry;
Later stage high-density sealed type leak stopping slurry is made up of the component of following parts by weight: medium sand 15 parts, 10 parts, water that the flax fiber 10 parts that portland cement 20 parts, Sodium Polyacrylate crosslinked copolymer particles 10 parts, length are 3-5cm, particle diameter are 0.35-0.5mm; Each component is weighed by its parts by weight, mixes, after wet milk grinds, send into agitator, then add UNF-5 type high efficiency water reducing agent, UNF-5 type high efficiency water reducing agent accounts for the 7%-9% of said components gross weight, make slurries absolute viscosity be 1180mPas, obtain later stage high-density sealed type leak stopping slurry;
(2) leak stopping
Polish drill rod, down to well depth 25m, pours into 32m
3the leak stopping of low-density expanded type is starched, and in note leak stopping slurry process, pump pressure rises to 1Mpa gradually, with clear water for slurry 5m
3, in slurry process, pump pressure rises to 3MPa gradually, after terminating, rises and is drilled into well depth 18m for slurry, returns slurry 4.5m
3.
After 4 hours, perfusion 25m
3the leak stopping of high-density sealed type is starched, and in note leak stopping slurry process, pump pressure rises to 1MPa gradually, with clear water for slurry 6m
3, rise to 1MPa gradually for pump pressure in slurry process, after terminating for slurry, work being drilled into well depth 18m and waiting solidifying, return slurry 2.3m
3.
Second stage 25-37m:
(1) preparation low-density expanded type in early stage leak stopping slurry and later stage high-density sealed type leak stopping slurry
Low-density expanded type leak stopping in early stage slurry is made up of the component of following parts by weight: composite filler polyflon 4 parts, composite consolidation agent first coagulate 4 parts, Sodium Polyacrylate crosslinked copolymer particles 3 parts, the length flax fiber 6 parts that is 3-5cm, particle diameter be 8-10mm 1 part, sawdust, 82 parts, water; Each component is weighed by its parts by weight, mixes, after wet milk grinds, send into agitator, then add UNF-5 type high efficiency water reducing agent, UNF-5 type high efficiency water reducing agent accounts for the 7%-9% of said components gross weight, make slurries absolute viscosity be 118mPas, obtain low-density expanded type leak stopping in early stage slurry;
Later stage high-density sealed type leak stopping slurry is made up of the component of following parts by weight: medium sand 20 parts, 8 parts, water that the flax fiber 15 parts that early strength silicate cement 25 parts, Sodium Polyacrylate crosslinked copolymer particles 8 parts, length are 3-5cm, particle diameter are 0.35-0.5mm; Each component is weighed by its parts by weight, mixes, after wet milk grinds, send into agitator, then add UNF-5 type high efficiency water reducing agent, UNF-5 type high efficiency water reducing agent accounts for the 7%-9% of said components gross weight, make slurries absolute viscosity be 120mPas, obtain later stage high-density sealed leak stopping slurry;
(2) leak stopping
Polish drill rod, down to well depth 37m, pours into 80m
3the leak stopping of low-density expanded type is starched, and in note leak stopping slurry process, pump pressure rises to 1Mpa gradually, with clear water for slurry 12m
3, in slurry process, pump pressure rises to 3MPa gradually, after terminating, rises and is drilled into well depth 25m for slurry, returns slurry 1.5m
3.
After 4 hours, perfusion 32m
3the leak stopping of high-density sealed type is starched, and in note leak stopping slurry process, pump pressure rises to 1MPa gradually, with clear water for slurry 8m
3, rise to 1MPa gradually for pump pressure in slurry process, after terminating for slurry, work being drilled into well depth 18m and waiting solidifying, return slurry 1.3m
3.
Phase III 37-45m:
(1) preparation low-density expanded type in early stage leak stopping slurry
Low-density expanded type leak stopping in early stage slurry is made up of the component of following parts by weight: composite filler polyflon 5 parts, composite consolidation agent first coagulate 4 parts, Sodium Polyacrylate crosslinked copolymer particles 2.5 parts, the length flax fiber 5 parts that is 3-5cm, particle diameter be 8-10mm 0.5 part, sawdust, 83 parts, water; Each component is weighed by its parts by weight, mixes, after wet milk grinds, send into agitator, then add UNF-5 type high efficiency water reducing agent, UNF-5 type high efficiency water reducing agent accounts for the 7%-9% of said components gross weight, make slurries absolute viscosity be 115mPas, obtain low-density expanded type leak stopping in early stage slurry;
(2) leak stopping
Polish drill rod, down to well depth 45m, pours into 32m
3the leak stopping of low-density expanded type is starched, and in note leak stopping slurry process, pump pressure rises to 1Mpa gradually, after note leak stopping slurry terminates, rises and is drilled into well depth 37m, shove 8m after closed-in well 1h
3.
Effect:
By check analysis, adopt the successful of the leak stopping slurry prepared of the present invention and construction technology leak stopping karst cavities in dam foundation type leakage section, pressure-bearing meets the demands, and then is drilled into the 65m degree of depth and completes grouting, has no obvious leakage.
Claims (9)
1. a construction technology for the hidden large fracture of the leak stopping dam foundation, is characterized in that, comprise the following steps:
(1) boring and deviational survey
With the boring of geology slewing drilling machine, before perforate, adopt two-point method earth anchorage, correct rig vertical shaft with bevel protractor and circumferentor;
(2) bore flushing and simple and easy setting-out
Adopt water under high pressure pulsation to rinse, washing time is 30-60min, then returns clear water 10min; All carry out simple and easy packer permeability test before grouting, ensure that setting-out pressure is 1.0MPa;
(3) slurrying
Leak stopping slurry comprises low-density expanded type leak stopping in early stage and starches and later stage high-density sealed type leak stopping slurry;
Wherein, low-density expanded type leak stopping in early stage slurry is made up of the component of following parts by weight: composite filler 3-5 part, composite consolidation agent 4-5 part, Sodium Polyacrylate crosslinked copolymer particles 2.5-3 part, flax fiber 5-6 part, sawdust 0.5-1 part, water 80-85 part; Each component weighed by its parts by weight, mix, after wet milk grinds, send into agitator, then add UNF-5 type high efficiency water reducing agent, UNF-5 type high efficiency water reducing agent accounts for the 7%-9% of said components gross weight, obtains low-density expanded type leak stopping in early stage slurry;
Later stage high-density sealed type leak stopping slurry is made up of the component of following parts by weight: portland cement 20-30 part, Sodium Polyacrylate crosslinked copolymer particles 5-10 part, flax fiber 5-15 part, medium sand 15-20 part, water 5-10 part; Each component weighed by its parts by weight, mix, after wet milk grinds, send into agitator, then add UNF-5 type high efficiency water reducing agent, UNF-5 type high efficiency water reducing agent accounts for the 7%-9% of said components gross weight, obtains later stage high-density sealed type leak stopping slurry;
(4) be in the milk
First fill with low-density expanded type leak stopping in early stage slurry, carry out the perfusion of later stage high-density sealed type leak stopping slurry after 4 hours, filling limit, limit adds 20-30% fine sand in hole, until slurry is returned in aperture;
(5) gravel, coarse sand are filled with in aperture punching
With clear water in aperture in hole first backlash fill with gravel, coarse sand until blocking channel.
2. the construction technology of the hidden large fracture of a kind of leak stopping dam foundation according to claim 1, is characterized in that, Sodium Polyacrylate crosslinked copolymer particles used in step (3), and its preparation method comprises the following steps:
1. by acrylates: water is the ratio mixing of 1:4 in mass ratio, makes acrylic acid brine solution;
2. by NaOH: acrylic acid: water is the ratio mixing of 1:2:5 in mass ratio;
3. by sodium peroxydisulfate or ammonium persulfate: water is the ratio mixing of 1:14 in mass ratio;
4. by step 1. in the acrylic acid brine solution that obtains and step 2., the solution equal-volume that 3. obtains of step mixes to be placed in stainless steel reactor and reacts 40-60min, reaction temperature is 75 DEG C, obtains gel state fluid;
5. gel state fluid and fineness modulus be the medium sand of 3.0 in mass ratio for the ratio of 1:8 mix, obtain containing sand colloid;
6. will containing in sand colloid injected plastic mould, mould eyelet is of a size of the square groove of 3-10mm, and mould is placed on outdoor airing, dry at normal temperatures, can obtain foursquare Sodium Polyacrylate crosslinked copolymer particles after the demoulding.
3. the construction technology of the hidden large fracture of a kind of leak stopping dam foundation according to claim 1, is characterized in that, composite filler used in step (3) is polyflon, and composite consolidation agent is that first is coagulated.
4. the construction technology of the hidden large fracture of a kind of leak stopping dam foundation according to claim 1, is characterized in that, sawdust particle diameter used in step (3) is 8-10mm.
5. the construction technology of the hidden large fracture of a kind of leak stopping dam foundation according to claim 1, is characterized in that, the length of flax fiber used in step (3) is 3-5cm.
6. the construction technology of the hidden large fracture of a kind of leak stopping dam foundation according to claim 1, is characterized in that, medium sand particle diameter used in step (3) is 0.35-0.5mm.
7. the construction technology of the hidden large fracture of a kind of leak stopping dam foundation according to claim 1, is characterized in that, the absolute viscosity of step (3) mid-early stage low-density expanded type leak stopping slurry and later stage high-density sealed type leak stopping slurry is 115-120mPas.
8. the construction technology of the hidden large fracture of a kind of leak stopping dam foundation according to claim 1, is characterized in that, fine sand particle diameter used in step (4) is 0.1-0.25mm.
9. the construction technology of the hidden large fracture of a kind of leak stopping dam foundation according to claim 1, is characterized in that, grain size of gravel used in step (5) is 2-5mm, and coarse sand particle diameter is 0.5-2mm.
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| JPH06248895A (en) * | 1993-02-26 | 1994-09-06 | Itsuki Kogyo Kk | Grout and grouting method |
| CN101235632A (en) * | 2007-12-28 | 2008-08-06 | 中国水电顾问集团中南勘测设计研究院 | Grouting leak-stopping technique |
| CN101328052A (en) * | 2008-07-28 | 2008-12-24 | 中国建筑第四工程局有限公司 | Hill sand inorganic grouting material, preparation and construction method thereof |
| CN103174112A (en) * | 2013-03-28 | 2013-06-26 | 葛洲坝集团试验检测有限公司 | Grouting method of penetrability concrete cracks |
| CN103898873A (en) * | 2014-03-25 | 2014-07-02 | 安徽水安建设集团股份有限公司 | Water seepage plugging construction method of shaft construction seams under high water head |
| CN104047266A (en) * | 2014-06-27 | 2014-09-17 | 黄河勘测规划设计有限公司 | Seepage-proofing and leaking-stoppage method of leakage passage |
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