CN104594369A - High-pressure group hole replacement grouting method and structure in karst region - Google Patents
High-pressure group hole replacement grouting method and structure in karst region Download PDFInfo
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- CN104594369A CN104594369A CN201410694710.9A CN201410694710A CN104594369A CN 104594369 A CN104594369 A CN 104594369A CN 201410694710 A CN201410694710 A CN 201410694710A CN 104594369 A CN104594369 A CN 104594369A
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- boring
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/16—Restraining of underground water by damming or interrupting the passage of underground water by placing or applying sealing substances
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/003—Injection of material
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a high-pressure group hole replacement grouting method and structure in a karst region. A grouting gallery or an adit (2) is arranged above a karst cave area (1), a drilling hole (3) is distributed in the grouting gallery or the adit (2) towards the karst cave area (1), the lower end of the drilling hole (3) is located in the karst cave area (1), and the range where the drilling hole (3) is located is divided into a replacement inlet area (4) and a replacement outlet area (5); sand-mixed cement mortar with the mass ratio of 0.5:1 is injected into the drilling hole (3) in the replacement inlet area (4) through high pressure, filler of the karst cave is extruded out of the drilling hole (3) of the replacement outlet area (5) fully or partially, and then a common cement grouting method is adopted for grouting 24-36 hours later after condensation. The high-pressure group hole replacement grouting method and structure in the karst region realize grouting of medium and small filling-type karst cave and other geological flaw sections in the karst region, and have the advantages of being simple, capable of largely shortening the construction period, low in expense, obvious in effect, capable of guaranteeing grouting quality, and the like.
Description
Technical field
The present invention relates to karst geological disposal method, be specifically related to a kind of karst high pressure group hole replacement grouting method and structure thereof.
Background technology
Karst topography refers to that the water with corrosion power carries out to solublerock the general name that corrosion etc. acts on earth's surface and the underground form formed.Water, based on corrosion, also comprises the erosion of flowing water, shallow erosion, and the mechanical erosion process such as to collapse.
Build Hydraulic and Hydro-Power Engineering in karst, its reservoir Karst Filter Zone is one of principal works problem, and can suitable and effective anti-seepage scheme be selected to be related to reservoir normally retaining.Current karst impervious grouting process engineering is based on cementation.In grouting construction process, often can run into big and small filling clay, the solution cavity of loam, adopt conventional grouting method not reach designing requirement.Current specifications (DL/T5148-2012) although in filling-type Karst cave grouting have special requirement, high pressure grouting, high pressure phase equilibria, low pressure can be adopted, underflow, current limliting, limitation, the engineering measures such as interval, but in practice of construction process these methods often exist the construction period long, costly, the shortcoming such as anti-seepage effect is poor.
When grout hole runs into the solution cavity of the filling such as clay, loam, often there is the problem such as collapse hole, bit freezing, bury drills, string hole spillage, except midge amount is very large, also have a strong impact on construction speed and construction quality, although adopt conventional grouting measure process to have certain effect, but when again constructing to this solution cavity section, its proterties often worsens again by its construction water, have to again repeat grouting, and so forth repeatedly, cause the significant wastage of grouting agent, and also do not reach desirable treatment effect.
Therefore, for the process of such Geological Defects, in prior art, still there is no desirable technical scheme.
Summary of the invention
The object of the invention is to, for the problem solved to the project seepage controlling grouting treatment of casta region in prior art, provide high pressure group hole, a kind of karst replacement grouting method.
Technical scheme of the present invention is such:
It has employed a kind of like this grouting structure: above solution cavity district, arrange irrigation gallery or adit, and lay boring at irrigation gallery or adit to solution cavity district, the lower end of boring is arranged in solution cavity district, boring in-scope is divided into displacement entrance region and displaces mouth region; The aperture place of the boring in region is provided with orifice sealing device.The pitch-row of boring is 2 ~ 2.5m.During grouting, at the boring mesohigh implantation quality of displacement entrance region than mixing sand cement slurry for 0.5:1, by solution-cavity filling all or major part extrude from the boring displacing mouth region, after solidifying 24h ~ 36h, take traditional cements grouting method to pour into again.
Concrete, this group of hole replacement grouting methods comprise the steps:
1) grout hole, pilot hole (being generally grouting pilot hole or I sequence grout hole) or physical prospecting means are utilized to find out growth scale, the character of charges, the roof and floor hole depth elevation of solution cavity in solution cavity district;
2) the grouting order of grout holes all in solution cavity district by designing requirement is constructed to Upper Plate of Karst Cave after 1 ~ 2m, then pierce the complete basement rock 1 ~ 2m of below solution cavity base plate;
3) determine displacement entrance region and displace mouth region, and determine the grout hole of the boring that can be used as displacement entrance region and displace mouth region, then at the aperture place installing hole sealer for mouth of all boring, the valve wherein displaced on the orifice sealing device in the boring of mouth region is in open mode;
Namely using the boring of existing grout hole as replacement grouting, and secondary drilling can be carried out.But and the existing grout hole of not all as the boring of replacement grouting of the present invention, can determine that the principle of the boring of replacing entrance region and displacing mouth region is:
When solution cavity is grown for level or nearly horizontal direction, the grout hole in solution cavity district all can be used as displacement entrance region and displaces the boring of mouth region;
When solution cavity is grown for incline direction, in solution cavity district, the grout hole of low elevation is as the boring of replacing entrance region.
4) be connected by the orifice sealing device of the high-pressure rubber pipe on high pressure mortar pump with displacement entrance region, and add that to press to injection water/binder ratio be 0.5:1 cement paste in the hole in, grouting pressure controls at 4 ~ 6MPa;
5) when solution-cavity filling thing appears in the drilling orifice displacing mouth region, in the boring of displacement entrance region, infusion is adjusted to and mixes sand cement slurry, and mixing sand ratio (cement weight than) is 10%, 20%, 30% 3 grade, and by from little to mixing in cement paste step by step greatly;
6) when cement paste appears in the drilling orifice displacing mouth region, replacement operator is suspended; Mixing sand cement slurry by continuing perfusion after the orifice sealing device valve closing displaced in the boring of mouth region again, until import boring injection rate is not more than 5L/min can terminate displacement, and treating solidifying 36h ~ 48h;
7) reach after the solidifying time, in solution cavity district routinely grouting method carry out strengthening grouting in order, until by this solution cavity fill with section.
Adopt the present invention when being in the milk in the solution cavity location of karst clay and loam filling, Appropriate application grout hole (not increasing engineering quantity) replaces solution-cavity filling thing, fast and effeciently can reach designing requirement, also can increase substantially construction efficiency simultaneously and reduce grouting agent waste.High pressure replacement grouting method of the present invention is for quick, economic, the efficient grouting treatment technology of the one of the filling-type Karst cave being highly less than 5m, there is method simple (use on-the-spot grouting equipment and operating personnel, do not need to increase special construction equipment and special operation workers), the construction period can be increased substantially, expense is low, Be very effective, can the advantages such as grouting quality be ensured.
The present invention, with a kind of brand-new thinking, solves the grouting problem in the Geological Defects locations such as the middle-size and small-size filling-type Karst cave of karst in simple, efficient mode.
Accompanying drawing explanation
Fig. 1 is group hole of the present invention replacement grouting plane structure schematic diagram;
Fig. 2 is the A-A generalized section in Fig. 1.
Description of reference numerals: 1-solution cavity district, 2-irrigation gallery or adit, 3-holes, and 4-replaces entrance region, and 5-displaces mouth region.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is described in further detail.
See Fig. 1 and Fig. 2, wherein Fig. 1 illustrates the floor map of this grouting structure of the present invention, and Fig. 2 illustrates the A-A generalized section in Fig. 1, as can see from Figure 2, the growth direction in this solution cavity district 1 is similar to horizontal direction, tilt slightly to the right, the present invention arranges irrigation gallery or adit 2 above solution cavity district 1, boring 3 is laid to solution cavity district 1 at irrigation gallery or adit 2, the I sequence grout hole bored in previous operation can be utilized as boring 3, and the lower end of boring 3 is arranged in solution cavity district 1; After determining boring 3, boring 3 in-scope be divided into displacement entrance region 4 and displace mouth region 5.
In Fig. 2, left-hand component is for displacing mouth region 5, right-hand component is displacement entrance region 4, and as can see from Figure 2, the solution cavity elevation of the displacement entrance region 4 on the right is lower than the left side, therefore using the right as displacement entrance region 4, compare like this and utilize the right priming charge mud to be extruded completely from the boring 3 of left-hand component by the charges in left-hand component solution cavity; In addition, at the aperture place of boring 3, orifice sealing device is installed, like this aperture of the boring 3 of displacement entrance region 4 is closed, and open wide in the aperture displacing mouth region 5, such cement paste is under High Pressure, can only from displacement entrance region 4 to the direction flowing displacing mouth region 5 in solution cavity, the charges the most at last in solution cavity are extruded from the aperture of the boring 3 displacing mouth region 5.
As can see from Figure 1, boring 3 is evenly arranged within the scope of the growth in solution cavity district 1, and select quincuncial arrangement or two row's interlaced arrangement as shown in Figure 1 according to the growth scope in solution cavity district 1, preferably, the pitch-row of boring 3 is 2 ~ 2.5m.
Embodiment 1:
The filling-type Karst cave in adit curtain grouting district under some hydropower station, charges are mainly clay, (string water, the grout leaking) phenomenon that easily occurs that porous communicates, porous all cannot reach designing requirement through repeatedly answering filling, adopt method of the present invention to process, can meet design requirement through the inspection of grouting inspection eye after having processed.
Certainly, more than just embody rule example of the present invention, the technical scheme that the present invention also has other embodiment, all employings to be equal to replacement or equivalent transformation to be formed, all drops within protection domain of the presently claimed invention.
Claims (5)
1. high pressure group hole, karst replacement grouting method, it is characterized in that: irrigation gallery or adit (2) are set in the top of solution cavity district (1), boring (3) is laid to solution cavity district (1) at irrigation gallery or adit (2), the lower end of boring (3) is arranged in solution cavity district (1), and (3) in-scope of holing is divided into displacement entrance region (4) and displaces mouth region (5); Starch than the sand cement of mixing for 0.5:1 at boring (3) the mesohigh implantation quality of displacement entrance region (4), by solution-cavity filling all or major part extrude from the boring (3) displacing mouth region (5), after solidifying 24h ~ 36h, take traditional cements grouting method to pour into again.
2. high pressure group hole, karst according to claim 1 replacement grouting method, is characterized in that the method comprises the steps:
1) grout hole, pilot hole or physical prospecting means are utilized to find out growth scale, the character of charges, the roof and floor hole depth elevation of solution cavity in solution cavity district (1);
2) the grouting order of all grout holes in solution cavity district (1) by designing requirement is constructed to Upper Plate of Karst Cave after 1 ~ 2m, then pierce the complete basement rock 1 ~ 2m of below solution cavity base plate;
3) determine displacement entrance region (4) and displace mouth region (5), and determine the grout hole of the boring (3) that can be used as displacement entrance region (4) and displace mouth region (5), then at the aperture place installing hole sealer for mouth of all boring (3), the valve wherein displaced on the orifice sealing device in the boring (3) of mouth region (5) is in open mode;
4) the orifice sealing device of the high-pressure rubber pipe on high pressure mortar pump with displacement entrance region (4) is connected, and adds that to press in hole injection water/binder ratio be 0.5:1 cement paste;
5) when solution-cavity filling thing appears in boring (3) aperture displacing mouth region (5), boring (3) the interior infusion of displacement entrance region (4) is adjusted to mixes sand cement slurry, mixing sand ratio is 10%, 20%, 30% 3 grade, and by from little to mixing in cement paste step by step greatly;
6) when cement paste appears in boring (3) aperture displacing mouth region (5), replacement operator is suspended; Mixing sand cement slurry by continuing perfusion after the orifice sealing device valve closing displaced in the boring (3) of mouth region (5) again, until import boring injection rate is not more than 5L/min can terminate displacement, and treating solidifying 36h ~ 48h;
7) reach after the solidifying time, in solution cavity district (1) routinely grouting method carry out strengthening grouting in order.
3. high pressure group hole, karst according to claim 2 replacement grouting method, it is characterized in that: step 3) determines that the principle of the boring (3) of replacing entrance region (4) and displacing mouth region (5) is: when solution cavity is grown for level or nearly horizontal direction, the grout hole in solution cavity district (1) all can be used as displacement entrance region (4) and displaces the boring (3) of mouth region (5);
When solution cavity is grown for incline direction, in solution cavity district (1), the grout hole of low elevation is as the boring (3) of replacing entrance region (4).
4. one kind is applicable to the group hole replacement grouting structure of karst, it is characterized in that: irrigation gallery or adit (2) are set in the top of solution cavity district (1), boring (3) is laid to solution cavity district (1) at irrigation gallery or adit (2), the lower end of boring (3) is arranged in solution cavity district (1), and (3) in-scope of holing is divided into displacement entrance region (4) and displaces mouth region (5); At the aperture place of all boring (3), orifice sealing device is installed.
5. the group hole replacement grouting structure being applicable to karst according to claim 2, is characterized in that: the pitch-row of boring (3) is 2 ~ 2.5m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410694710.9A CN104594369B (en) | 2014-11-27 | 2014-11-27 | Karst high pressure group hole replacement grouting method and its structure |
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| CN201410694710.9A CN104594369B (en) | 2014-11-27 | 2014-11-27 | Karst high pressure group hole replacement grouting method and its structure |
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| CN104594369A true CN104594369A (en) | 2015-05-06 |
| CN104594369B CN104594369B (en) | 2017-12-05 |
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Cited By (3)
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| CN106437692A (en) * | 2016-08-23 | 2017-02-22 | 中国电建集团贵阳勘测设计研究院有限公司 | Deep karst leakage passage detection structure and method based on drill rod inner pipe water level |
| CN106837411A (en) * | 2017-02-04 | 2017-06-13 | 长江勘测规划设计研究有限责任公司 | The arrangement and method of a kind of buried shield tunnel filling and injecting slurry |
| WO2021248872A1 (en) * | 2020-06-11 | 2021-12-16 | 中铁一局集团第二工程有限公司 | Method for determining safe thickness of side wall in karst area of foundation pit, and grouting device |
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| CN106837411B (en) * | 2017-02-04 | 2020-04-03 | 长江勘测规划设计研究有限责任公司 | Arrangement structure and method for filling and grouting of deep-buried shield tunnel |
| WO2021248872A1 (en) * | 2020-06-11 | 2021-12-16 | 中铁一局集团第二工程有限公司 | Method for determining safe thickness of side wall in karst area of foundation pit, and grouting device |
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| Publication number | Publication date |
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| CN104594369B (en) | 2017-12-05 |
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