CN111962541A - Foundation pit water burst plugging method based on double-liquid grouting method under complex stratum condition - Google Patents
Foundation pit water burst plugging method based on double-liquid grouting method under complex stratum condition Download PDFInfo
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- CN111962541A CN111962541A CN202010628853.5A CN202010628853A CN111962541A CN 111962541 A CN111962541 A CN 111962541A CN 202010628853 A CN202010628853 A CN 202010628853A CN 111962541 A CN111962541 A CN 111962541A
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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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- 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
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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
- C04B28/24—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 alkyl, ammonium or metal silicates; containing silica sols
- C04B28/26—Silicates of the alkali metals
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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- Structural Engineering (AREA)
- Ceramic Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Paleontology (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
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- Agronomy & Crop Science (AREA)
- Soil Sciences (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The application discloses a foundation pit water burst plugging method based on a double-liquid grouting method under a complex stratum condition, and relates to the field of engineering construction. The method comprises the following steps: respectively injecting cement slurry and a sodium silicate aqueous solution into a mixer according to a second preset proportion for mixing to form mixed slurry; injecting the mixed slurry into the grouting hole within a preset grouting pressure range; acquiring the grouting time and grouting pressure of mixed slurry; judging whether the grouting time required by the grouting pressure reaching the preset pressure is less than the preset time or not; under the condition that the grouting time is less than the preset grouting time, the proportion of the cement paste to the sodium silicate aqueous solution is adjusted to enable the proportion of the cement paste to the sodium silicate aqueous solution to be greater than a second preset proportion; judging whether the grouting time reaches the preset time and the grouting pressure is smaller than the preset pressure or not; and under the condition that the grouting pressure is lower than the preset pressure, adjusting the proportion of the cement paste to the sodium silicate aqueous solution to ensure that the proportion of the cement paste to the sodium silicate aqueous solution is lower than a second preset proportion.
Description
Technical Field
The application discloses a foundation pit water burst plugging method based on a double-liquid grouting method under a complex stratum condition, and relates to the field of engineering construction.
Background
For the plots with a large amount of water gushing, the foundation construction on the plots can cause overlarge foundation settlement due to unstable foundation and the problems of uneven foundation settlement and the like.
Disclosure of Invention
The purpose of this application lies in: the problem that the existing monorail conveyor cannot be stopped at any time is solved.
In order to achieve the above object, the present application provides the following technical solutions:
a foundation pit water burst plugging method based on a double-liquid grouting method under a complex stratum condition comprises the following steps:
mixing cement and a calcium chloride aqueous solution according to a first preset proportion to obtain cement slurry;
respectively injecting the cement slurry and the sodium silicate aqueous solution into a mixer according to a second preset proportion for mixing to form mixed slurry;
injecting the mixed slurry into a grouting hole within a preset grouting pressure range;
acquiring the grouting time and the grouting pressure of the mixed slurry;
judging the grouting time required by the grouting pressure reaching the preset pressure;
under the condition that the grouting time is less than the preset grouting time, adjusting the proportion of the cement paste to the sodium silicate aqueous solution to enable the proportion of the cement paste to the sodium silicate aqueous solution to be greater than the second preset proportion;
judging the grouting pressure when the grouting time reaches the preset time;
and under the condition that the grouting pressure is smaller than the preset pressure, adjusting the proportion of the cement paste to the sodium silicate aqueous solution to enable the proportion of the cement paste to the sodium silicate aqueous solution to be smaller than the second preset proportion.
Further, the method also comprises the following steps:
and arranging a waterproof curtain belt at the edge of the preset area, wherein the waterproof curtain belt forms a ring shape.
Further, the method also comprises the following steps:
and drilling holes in the range surrounded by the waterproof curtain belt to form a plurality of grouting holes, wherein the grouting holes are distributed at intervals.
Further, the plurality of injection holes are distributed in a row in a first direction, and the plurality of injection holes are distributed in a row in a second direction.
Further, the air conditioner is provided with a fan,
the sequence of injecting the mixed slurry into the plurality of grouting holes within a preset grouting pressure range is as follows:
after the grouting holes for the first grouting are determined, at least one grouting hole is arranged between the grouting hole for each subsequent grouting and the grouting hole for the previous grouting.
Further, the air conditioner is provided with a fan,
in the first direction, the distance between two adjacent grouting holes is 1.1-1.3 m;
in the second direction, the distance between two adjacent grouting holes is 1.1-1.3 m.
Further, the concentration of the calcium chloride aqueous solution is 50%, and the density is 1.30-1.4g/cm3。
Further, the modulus of the sodium silicate aqueous solution is 2.4-3.2, the Baume degree is 42-46 degrees, and the density is 1.40-1.46g/cm2。
Further, the initial setting time of the cement is not less than 3 h.
Compared with the prior art, the beneficial effect of this application is:
the utility model provides a foundation ditch gushing water shutoff method based on biliquid slip casting under complicated stratum condition, utilize the mixed thick liquid that grout and sodium silicate aqueous solution formed, it is downthehole to pour into the slip casting under certain pressure, because the curing time of mixed thick liquid is shorter and the curing process receives the influence of water less, thereby can carry out the shutoff to the slip casting hole fast and form the stake, utilize a plurality of stakes to consolidate the ground, can effectively improve the structural strength of ground, in order to satisfy the requirement of building the basis on the ground. And in the grouting process, the proportion of the cement slurry and the sodium silicate aqueous solution in the mixed slurry is timely adjusted by observing the grouting time and the grouting pressure, so that different grouting requirements are met. Specifically, under the condition that the grouting time is less than the preset grouting time and the grouting pressure reaches the preset pressure, the curing speed of the mixed slurry is too high, and the proportion of cement slurry in the mixed slurry needs to be increased to reduce the curing speed of the mixed slurry; when the grouting time is longer than the preset grouting time and the grouting pressure is lower than the preset pressure, the curing speed of the mixed slurry is too slow, and the proportion of the sodium silicate aqueous solution in the mixed slurry needs to be increased to increase the curing speed of the mixed slurry.
Description of the drawings:
fig. 1 is a flowchart of a foundation pit water burst plugging method based on a double-fluid grouting method under complex formation conditions provided by the application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be described in detail and completely with reference to the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all embodiments.
Thus, the following detailed description of the embodiments of the present application is not intended to limit the scope of the claimed application, but is merely representative of some embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that, in the embodiments and the features and technical solutions in the embodiments of the present application may be combined with each other without conflict.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like refer to orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or orientations or positional relationships that are conventionally arranged when products of the application are used, or orientations or positional relationships that are conventionally understood by those skilled in the art, and such terms are used for convenience in describing the present application and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
Examples
As shown in fig. 1: the application provides a foundation pit water burst plugging method based on a double-liquid grouting method under a complex stratum condition, which comprises the following steps:
and S1, mixing the cement and the calcium chloride aqueous solution according to a first preset proportion to obtain the cement paste. The calcium chloride aqueous solution is used as an additive to be added into the cement, so that the curing time of the obtained cement paste can be effectively shortened, the cement paste is rapidly cured, and a pile is formed in the grouting hole.
And S2, respectively injecting the cement slurry and the sodium silicate aqueous solution into the mixer according to a second preset proportion for mixing to form mixed slurry. The mixed slurry uses the sodium silicate aqueous solution as an additive to be added into the cement slurry, so that the curing time of the cement slurry can be further reduced, the flow rate of the mixed slurry can be effectively reduced due to the fact that the sodium silicate aqueous solution is viscous, the retention time of the mixed slurry in a grouting hole is prolonged, the mixed slurry is cured at a slow flow rate, and the quick forming of a pile in the grouting hole is facilitated so as to reinforce the foundation.
And S3, injecting the mixed slurry into the grouting hole within a preset grouting pressure range. Since the mixed slurry needs to be injected into the inside of the grouting hole, water in the grouting hole needs to be drained under a certain pressure. Specifically, the preset grouting pressure can be between 1.2MP and 1.5 MP.
And S4, acquiring the grouting time and grouting pressure of the mixed slurry. A timer can be adopted to obtain grouting time, and a pressure sensor is utilized to obtain grouting pressure. In particular, the pressure sensor may be arranged inside the mixed pulp.
And S5, judging the grouting time required by the grouting pressure reaching the preset pressure. The preset pressure may be a pressure required for the mixing to be injected into the grout hole when the mixing is to be cured to a certain degree.
And S6, adjusting the ratio of the cement paste to the sodium silicate aqueous solution under the condition that the grouting time is less than the preset grouting time, so that the ratio of the cement paste to the sodium silicate aqueous solution is greater than a second preset ratio. Under the condition that grouting pressure reaches preset pressure and grouting time is less than preset grouting time, the curing time of mixed slurry is too short, so that the mixed slurry is difficult to penetrate into the grouting hole, the proportion of the cement slurry and the sodium silicate aqueous solution in the mixed slurry needs to be adjusted, the proportion of the cement slurry is increased, the flow rate of the mixed slurry is increased, and under the condition that the flow rate of the mixed slurry is increased, the curing time of the mixed slurry can be increased, so that the mixed slurry can better stretch into the grouting hole.
And S7, judging that the grouting time reaches the size of the grouting pressure of the preset time. Because under some circumstances, for example, under the condition that the flow rate of mixed slurry is too fast, mixed slurry may flow out from the grouting hole, or the curing time of the mixed slurry is too long, the grouting pressure may not reach the preset pressure for a long time, so that the grouting pressure does not need to wait for reaching the preset pressure, and only the grouting pressure when reaching the preset time needs to be judged, so as to save time and enable the proportion of the mixed slurry to be adjusted in time.
And S8, adjusting the ratio of the cement paste to the sodium silicate aqueous solution under the condition that the grouting pressure is smaller than the preset pressure, so that the ratio of the cement paste to the sodium silicate aqueous solution is smaller than a second preset ratio. Under the condition that the grouting time reaches the preset time grouting pressure and the grouting pressure is smaller than the preset pressure, the flow speed of mixed slurry is over fast, and the curing time is over long, so that the proportion of the cement slurry and the sodium silicate aqueous solution in the mixed slurry needs to be adjusted, the proportion of the sodium silicate aqueous solution is increased, the flow speed of the mixed slurry is reduced, the curing time of the mixed slurry is shortened in a state that the flow speed of the mixed slurry is reduced, and the mixed slurry can be rapidly cured to prevent the mixed slurry from flowing out to other places.
The utility model provides a foundation ditch gushing water shutoff method based on biliquid slip casting under complicated stratum condition, utilize the mixed thick liquid that grout and sodium silicate aqueous solution formed, it is downthehole to pour into the slip casting under certain pressure, because the curing time of mixed thick liquid is shorter and the curing process receives the influence of water less, thereby can carry out the shutoff to the slip casting hole fast and form the stake, utilize a plurality of stakes to consolidate the ground, can effectively improve the structural strength of ground, in order to satisfy the requirement of building the basis on the ground. And in the grouting process, the proportion of the cement slurry and the sodium silicate aqueous solution in the mixed slurry is timely adjusted by observing the grouting time and the grouting pressure, so that different grouting requirements are met. Specifically, under the condition that the grouting time is less than the preset grouting time and the grouting pressure reaches the preset pressure, the curing speed of the mixed slurry is too high, and the proportion of cement slurry in the mixed slurry needs to be increased to reduce the curing speed of the mixed slurry; when the grouting time is longer than the preset grouting time and the grouting pressure is lower than the preset pressure, the curing speed of the mixed slurry is too slow, and the proportion of the sodium silicate aqueous solution in the mixed slurry needs to be increased to increase the curing speed of the mixed slurry.
It should be noted that, in the embodiments of the present application, the steps with different numbers are only for convenience of distinguishing, and have no necessary order relationship, and do not limit the protection scope of the present solution. For example, the order of step S5 and step S7 can be flexibly adjusted by those skilled in the art according to actual situations.
In some embodiments of the present application, the foundation pit water burst blocking method based on the double-fluid grouting method under the complex formation condition may further include the following steps:
and S0, arranging a waterproof curtain belt at the edge of the preset area, wherein the waterproof curtain belt is formed into a ring.
The waterproof curtain belt can effectively prevent external water from flowing into the area surrounded by the waterproof curtain belt so as to improve the operation condition of grouting operation. The depth of the waterproof curtain belt can be 20 m-25 m, so that the external water can be effectively prevented from flowing into the area surrounded by the waterproof curtain belt. Specifically, the waterproof curtain tape may have a depth of 22 m.
In some embodiments of the present application, the foundation pit water burst blocking method based on the double-fluid grouting method under the complex formation condition may further include the following steps:
and S01, drilling holes in the range surrounded by the waterproof curtain tape to form a plurality of grouting holes, wherein the grouting holes are distributed at intervals.
The multiple grouting holes distributed at intervals can form multiple piles distributed at intervals after grouting, so that the structural strength of the foundation is effectively improved, and the bearing requirement on the foundation is met.
In some embodiments of the present application, the plurality of injection holes are distributed in a row in the first direction, and the plurality of injection holes are distributed in a row in the second direction, i.e., the plurality of injection holes are distributed in a net shape. The piles formed in each grouting hole can influence the structural strength of soil in a certain range around the grouting hole, and the piles formed in a plurality of grouting holes in net distribution can influence the structural strength of soil in the flaky area so as to effectively improve the structural strength of the foundation in the area influenced by the piles.
In some embodiments of the present application, in the first direction, a distance between two adjacent grouting holes is 1.1 to 1.3 m; in the second direction, the distance between two adjacent grouting holes is 1.1-1.3 m. Specifically, in the first direction, the distance between two adjacent grouting holes may be 1.2 m; in the second direction, the distance between two adjacent grouting holes may also be 1.2 m. So as to ensure that the effective reinforcing effect is achieved by fewer grouting holes.
In some embodiments of the present application, the order of injecting the mixed slurry into the plurality of grouting holes within the preset grouting pressure range is:
after the grouting holes for the first grouting are determined, at least one grouting hole is arranged between the grouting hole for each subsequent grouting and the grouting hole for the previous grouting.
Specifically, firstly, drilling a hole in a preset area to form a first grouting hole, then, beginning to perform grouting in the first grouting hole, then, drilling positions separated by at least one grouting hole to form a second grouting hole, then, performing grouting in the second grouting hole, then, drilling positions separated by at least one grouting hole to form a third grouting hole, and then, performing grouting in the third grouting hole.
In some embodiments of the present application, the aqueous calcium chloride solution has a concentration of 50% and a density of 1.30-1.4g/cm 3. At this concentration, calcium chloride is readily incorporated into the cement slurry.
In some embodiments of the present application, the aqueous sodium silicate solution has a modulus of 2.4 to 3.2, a baume degree of 42 to 46, and a density of 1.40 to 1.46g/cm 2. In this state, the concentration of the sodium silicate aqueous solution is high, and the sodium silicate aqueous solution has certain fluidity, so that the mixed slurry can be effectively assisted to control the flow rate.
In some embodiments of the present application, the initial setting time of the cement is not less than 3 hours. In the case where the initial setting time of cement is too short, the curing time of the mixed slurry formed by the cement slurry and the sodium silicate aqueous solution is too short due to a slow flow rate, and it is difficult to sufficiently flow into the grouting hole and to adjust the curing time of the mixed slurry.
The above embodiments are only used for illustrating the present application and not for limiting the technical solutions described in the present application, and although the present application has been described in detail with reference to the above embodiments, the present application is not limited to the above specific embodiments, and therefore, any modification or equivalent replacement may be made to the present application; all such modifications and variations are intended to be included herein within the scope of this disclosure and the appended claims.
Claims (9)
1. A foundation pit water burst plugging method based on a double-liquid grouting method under a complex stratum condition is characterized by comprising the following steps:
mixing cement and a calcium chloride aqueous solution according to a first preset proportion to obtain cement slurry;
respectively injecting the cement slurry and the sodium silicate aqueous solution into a mixer according to a second preset proportion for mixing to form mixed slurry;
injecting the mixed slurry into a grouting hole within a preset grouting pressure range;
acquiring the grouting time and the grouting pressure of the mixed slurry;
judging whether the grouting time required by the grouting pressure reaching the preset pressure is less than the preset time or not;
under the condition that the grouting time is less than the preset grouting time, adjusting the proportion of the cement paste to the sodium silicate aqueous solution to enable the proportion of the cement paste to the sodium silicate aqueous solution to be greater than the second preset proportion;
judging whether the grouting time reaches a preset time and the size of the grouting pressure is smaller than a preset pressure or not;
and under the condition that the grouting pressure is smaller than the preset pressure, adjusting the proportion of the cement paste to the sodium silicate aqueous solution to enable the proportion of the cement paste to the sodium silicate aqueous solution to be smaller than the second preset proportion.
2. The foundation pit water burst plugging method based on the double-fluid grouting method under the complex stratum condition as claimed in claim 1, further comprising the steps of:
and arranging a waterproof curtain belt at the edge of the preset area, wherein the waterproof curtain belt forms a ring shape.
3. The foundation pit water burst plugging method based on the double-fluid grouting method under the complex stratum condition as claimed in claim 2, characterized by further comprising the following steps:
and drilling holes in the range surrounded by the waterproof curtain belt to form a plurality of grouting holes, wherein the grouting holes are distributed at intervals.
4. The method for foundation pit water burst blocking under complex formation conditions based on the dual fluid grouting method of claim 3, wherein the plurality of grouting holes are distributed in a row in a first direction, and the plurality of grouting holes are distributed in a row in a second direction.
5. The foundation pit water burst blocking method based on the double-fluid grouting method under the complex stratum condition as claimed in claim 4,
the sequence of injecting the mixed slurry into the plurality of grouting holes within a preset grouting pressure range is as follows:
after the grouting holes for the first grouting are determined, at least one grouting hole is arranged between the grouting hole for each subsequent grouting and the grouting hole for the previous grouting.
6. The foundation pit water burst blocking method based on the double-fluid grouting method under the complex stratum condition as claimed in claim 4,
in the first direction, the distance between two adjacent grouting holes is 1.1-1.3 m;
in the second direction, the distance between two adjacent grouting holes is 1.1-1.3 m.
7. The foundation pit water burst plugging method based on the two-fluid grouting method under the complicated stratum condition of claim 1, wherein the concentration of the calcium chloride aqueous solution is 50%, and the density is 1.30-1.4g/cm3。
8. The foundation pit water burst plugging method based on the two-fluid grouting method under the complicated stratum condition of claim 7, wherein the modulus of the sodium silicate aqueous solution is 2.4-3.2, the baume degree is 42-46 degrees, and the density is 1.40-1.46g/cm2。
9. The foundation pit water burst blocking method based on the double-fluid grouting method under the complex formation condition of claim 7, wherein the initial setting time of the cement is not less than 3 h.
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| CN202010628853.5A CN111962541A (en) | 2020-07-01 | 2020-07-01 | Foundation pit water burst plugging method based on double-liquid grouting method under complex stratum condition |
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| CN202010628853.5A CN111962541A (en) | 2020-07-01 | 2020-07-01 | Foundation pit water burst plugging method based on double-liquid grouting method under complex stratum condition |
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| CN112726619A (en) * | 2020-12-30 | 2021-04-30 | 中铁四局集团有限公司 | Three-dimensional grouting plugging method for continuous gushing water of sea-filling stratum |
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Application publication date: 20201120 |