CN115059049A - Application of quick-drying cement in frozen soil grouting and grouting method containing application - Google Patents
Application of quick-drying cement in frozen soil grouting and grouting method containing application Download PDFInfo
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- 239000004568 cement Substances 0.000 title claims abstract description 161
- 239000002689 soil Substances 0.000 title claims abstract description 103
- 238000001035 drying Methods 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000010276 construction Methods 0.000 claims abstract description 29
- 239000007788 liquid Substances 0.000 claims abstract description 6
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 22
- 230000006872 improvement Effects 0.000 claims description 19
- 229910000278 bentonite Inorganic materials 0.000 claims description 16
- 239000000440 bentonite Substances 0.000 claims description 16
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 16
- 239000002002 slurry Substances 0.000 claims description 15
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- 239000007921 spray Substances 0.000 claims description 2
- 238000007596 consolidation process Methods 0.000 abstract description 11
- 238000007710 freezing Methods 0.000 abstract description 6
- 230000008014 freezing Effects 0.000 abstract description 6
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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
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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
Abstract
The invention provides application of quick-drying cement in frozen soil grouting and a grouting method containing the application, and particularly relates to construction of grouting the quick-drying cement as grouting liquid for lifting and grouting in frozen soil behind a dock wall of a dock. In the invention, the grouting quick-drying cement can quickly form a porous honeycomb consolidation body after being injected into a soil layer, thereby playing the roles of reducing the lateral soil pressure of the dock wall and preserving heat, resisting freezing and resisting seepage.
Description
Technical Field
The invention relates to the technical field of improvement of frozen soil grouting behind a dock wall, in particular to application of quick-drying cement in frozen soil grouting and a grouting method containing the application.
Background
With the construction of the Qinghai-Tibet railway in China, China carries out a great deal of research and experience summary on how to construct in a frozen soil environment, and at present, the main ideas for solving the influence of soil freezing and thawing in China are to actively cool down, reduce the heat transferred into foundation soil and ensure the thermal stability of permafrost soil so as to ensure the stability of buildings constructed on the permafrost soil.
In winter, the frozen soil is like ice blocks in a frozen state, the volume of the frozen soil is expanded violently along with the reduction of the temperature, and the dock wall bears the lateral frost heaving force due to the restriction of the dock wall on frost heaving. In summer, the frozen soil is melted along with the rise of the temperature, so that the buildings built on the frozen soil section behind the dock wall are settled.
Disclosure of Invention
The invention aims to provide application of grouting quick-drying cement in frozen soil grouting and a frozen soil grouting method comprising the application, and particularly, the grouting quick-drying cement can quickly form a porous honeycomb-shaped consolidation body after being injected into a soil layer, so that the lateral soil pressure of a dock wall is reduced, and the effects of heat preservation, frost resistance and impermeability are achieved, further the influence of freeze thawing of the frozen soil layer is eliminated, and the problem of settlement of buildings built on a frozen soil section behind the dock wall is solved.
In order to achieve the above object, the present invention is achieved by the following technical means.
The application of the quick-setting cement in frozen soil grouting is characterized in that the quick-setting cement for grouting is used as a grouting liquid for lifting and grouting, and the construction of frozen soil grouting is carried out behind a dock wall.
As a further improvement of the invention, the application is replacement improvement of original soil in frozen soil by quick-drying cement when the frozen soil behind a dock wall is grouted.
In a further improvement of the present invention, in the replacement improvement, the replacement ratio of the shotcrete liquid containing the grouting quick-setting cement added during grouting in the total raw soil is 75% or less.
As a further improvement of the invention, the application is that after the quick-drying cement is injected by the guniting fluid, a cellular solid structure is formed in the frozen soil, and the density of the cellular solid structure is 300- 3 。
The invention also discloses a frozen soil grouting method comprising the application, which comprises the following steps:
in the construction of the single-weight pipe, firstly, a mechanical construction mode is utilized, a hole is drilled by drilling mud, after a set elevation is reached, the bentonite/cement is lifted and sprayed by a high-pressure pump, then quick-drying cement is made into grouting cement for cement grouting, and finally, the quick-drying cement is subjected to resetting grouting through pressure by the high-pressure pump.
As a further improvement of the invention, the drilling with the drilling mud is specifically as follows: the bentonite/cement is drilled by using a pilot hole, is matched with water, and is drilled by using a conical drill bit with the diameter of 112mm-151 mm.
As a further improvement of the invention, when the obstruction exists, the air compressor drives the drill bit in the drilling machine to drill holes.
As a further improvement of the present invention, the lifting and guniting of the drilling bentonite/cement by using the high-pressure pump specifically comprises: spraying the slurry with 15-25MPa bentonite/cement as slurry
As a further improvement of the invention, the quick-setting cement is used for preparing grouting cement, and the cement grouting is carried out, specifically: and (3) forming grouting cement by the quick-drying cement and water according to the water-cement ratio of 0.4-0.7, and grouting the grouting quick-drying cement.
As a further improvement of the invention, the resetting and grouting of the grouting quick setting cement by pressure by using the high-pressure pump is specifically as follows: and (3) carrying out resetting grouting on the grouting quick-drying cement through a high-pressure pump by using a 3.5-5mm nozzle under the grouting pressure of 15-25 Mpa.
Drawings
FIG. 1 is a flow chart of a frozen soil grouting method provided by the invention.
Detailed Description
The present invention is described in detail with reference to the embodiments shown in the drawings, but it should be understood that these embodiments are not intended to limit the present invention, and that functional, methodological, or structural equivalents thereof, which are equivalent or substituted by those of ordinary skill in the art, are within the scope of the present invention.
Example 1
In the present embodiment, specific construction is mainly described.
In this embodiment, the application of the fast-setting russian cement is mainly performed by a grouting method including the application, which includes the following steps:
the application of the quick-drying cement in frozen soil grouting is that the grouting quick-drying cement is used as a grouting liquid for lifting grouting and is used for construction of frozen soil grouting behind a dock wall. In the application, when the quick-drying cement is applied to frozen soil grouting, the quick-drying cement has the characteristics of stability, foaming and quick setting, and can be quickly injected into a soil layer in grouting so as to fully reduce the lateral soil pressure of a dock wall and play roles in heat preservation, freezing resistance and impermeability.
In this embodiment, the quick-drying cement can reduce the lateral earth pressure of the dock wall: because the cement has the functions of foaming and playing gas after the cement is used, the concretes formed by the cement and the soil form a honeycomb-like structure, and the density of the concretes after the foaming is 300- 3 Density of undisturbed soil 1600-1800kg/m 3 And the property and the specific gravity of soil behind the wall are reduced, so that the lateral soil pressure of the dock wall is reduced.
Further, when the application is grouting of frozen soil behind a dock wall, replacement improvement of original soil in the frozen soil by the quick-drying cement is achieved.
In the replacement improvement, the replacement rate of the grouting liquid containing the grouting quick-drying cement added during grouting in the total original soil is less than or equal to 75%. In this embodiment, if all the original soil is replaced by the quick-drying cement, or the replacement rate is greater than 75%, gaps and pores are too large, and the strength of the dock pipe pile dock wall is difficult to guarantee.
Further, the application is that the quick-setting cement is guniting liquidAfter grouting, forming a honeycomb solid structure in the frozen soil, wherein the density of the honeycomb solid structure is 300- 3 . The density is lower than the density of the original soil, and the specific gravity is reduced, so that the lateral soil pressure of the dock wall is reduced.
The invention also discloses a frozen soil grouting method comprising the application, which comprises the following steps:
in the construction of the single-weight pipe, firstly, a mechanical construction mode is utilized, a hole is drilled by drilling mud, after a set elevation is reached, the bentonite/cement is lifted and sprayed by a high-pressure pump, then quick-drying cement is made into grouting cement for cement grouting, and finally, the quick-drying cement is subjected to resetting grouting through pressure by the high-pressure pump.
Further, the drilling with the drilling mud is specifically: the bentonite/cement is drilled by using a pilot hole, is matched with water, and is drilled by using a conical drill bit with the diameter of 112mm-151 mm.
Specifically, when there is the hindrance, the mode drilling that carries out the drilling with the drill bit in the air compressor machine drive rig.
Further, the concrete steps of utilizing the high-pressure pump to lift and spray the drilling bentonite/cement are as follows: spraying the slurry with 15-25MPa bentonite/cement as slurry
Further, the quick-drying cement is used for preparing grouting cement, and cement grouting is carried out, specifically: and (3) forming grouting cement by the quick-drying cement and water according to the water-cement ratio of 0.4-0.7, and grouting the grouting quick-drying cement.
In the construction, cement slurries prepared by different water-cement ratios have different strengths and hydration reaction times, the smaller the water-cement ratio is, the stronger the strength is, and the larger the water-cement ratio is, the weaker the strength is. The water cement ratio has great influence on the pore structure of the consolidation body, and under the condition of certain cement consumption, the water cement ratio is increased, the porosity of the consolidation body is increased, the compactness is reduced, and the carbonization speed is increased. And the consolidation body with small water cement ratio has low carbonization speed because the structure of the cement paste is dense and the air permeability is low. Similarly, a large amount of cement per unit amount of cement causes slow carbonization of the cement, a large amount of cement-water ratio of the cement-water mixture is small, the amount of CO2 required for neutralization is large, and the time required for neutralization reaction is long. On the other hand, the cement-cement ratio of the solidification body is small, the residual moisture after the cement hydration is less, the compactness of the solidification body is high, the pores are small, the macropores are few, the resistance of CO2 diffusing into the concrete is large, the neutralization reaction takes longer time, and the carbonization depth is small. When the water cement ratio is too large, the concentration of the newly generated colloidal cement paste is low, redundant free moisture in the solidified body after hydration is often attached to the aggregate firstly, the bonding area of the colloid and the aggregate is reduced, the bonding force is reduced, and fine cracks can be generated during hardening, so that the strength of the solidified body is reduced. Therefore, it is necessary to properly control the water-cement ratio in order to reduce the damage caused by the carbonization of the solidification body. The quick-drying cement adopts different water-cement ratios according to different geological conditions, use positions, reinforcement requirements and construction processes, and is designed according to design requirements and a pre-construction test.
Further, the resetting and grouting of the grouting quick-setting cement by using the high-pressure pump through pressure specifically comprises the following steps: and (3) carrying out resetting grouting on the grouting quick-drying cement through a high-pressure pump by using a 3.5-5mm nozzle under the grouting pressure of 15-25 Mpa.
Example 2
In this embodiment, a russian project is used as a core for introduction.
1. Background of the invention
With the construction of the Qinghai-Tibet railway in China, China carries out a great deal of research and experience summary on how to construct in a frozen soil environment, and at present, the main ideas for solving the influence of soil freezing and thawing in China are to actively cool down, reduce the heat transferred into foundation soil and ensure the thermal stability of permafrost soil so as to ensure the stability of buildings constructed on the permafrost soil. However, research on improvement of the frozen soil environment by adopting a new material and a grouting process is less, and the characteristics and the construction process of the Jet Fast grouting quick-drying cement new material are mainly introduced in the embodiment.
In this example, and in example 1, the quick setting cement was as follows:
the product name is as follows: jet Fast quick-drying cement
Manufacturer information: hydraulic Cement production Limited, Inc., St. Peterburg, Russia
Specifically, the website introduced by the product is as follows:
https://geocem.spb.ru/catalog/gotovye-buroinektsionnye-materialy/product-jet-fast/
the product is something like an expansive cement. The cement, water and undisturbed soil are mixed, volume expansion is generated in 15 minutes, the expansion coefficient is 1.8-2.5 times, and gas is generated after 60 minutes, so that a honeycomb structure is formed in a consolidation body formed by the cement and the soil. In this embodiment, the JET FAST is used as the quick-drying cement for the first time, the manufacturer is a russian manufacturer, and the manufacturer meets the requirements of european standard EN 1504, and the main applications in russia are as follows:
in any technical or natural cavity (karst, clastic, free fracture and filling sedimentary rocks with different filtering characteristics); in the setting of geotechnical structures for various purposes, mineral systems will self-expand to 2-3 initial volumes to ensure the well spacing required for rapid filling or other fill volumes of BSS (rapidly setting mixture), which, due to expansion, plus discharge pressure, provides high penetration into various types of fractures and sedimentary rock; when the product is used in various drilling or soil injection technologies, the catastrophic absorption of the drilling fluid and the cement mortar is prevented; when the heat-insulating curtain and the screen are installed by adopting the general building drilling injection technology, the aerated concrete has the characteristic of low heat conduction value; when the drilling injection method is used to arrange soil elements as emergency materials; when the jet grouting technology (such as jet grouting of various diameters) is used for arranging the drilling geotechnical engineering elements, the jet flushing is carried out by using soil replacement, and the jet grouting technology is also used for filling fixed spaces and domes in mine operation and eliminating air leakage when structures such as fire prevention, water prevention and insulation jumper wires are installed.
In particular, the quick-drying cement product in this embodiment is named as Russian water conservancy impurity, PIROOT KHH K3 (56)/2019.
2. Introduction of construction environment.
The scheme in the embodiment is used for a certain Russian project, in the project, the length of a dock project is 415m, the width of the dock project is 190m, the height of the dock wall is 20.2m, the dock wall is in a structural form of a lock catch steel pipe pile and an anchor pull rod, the size of the steel pipe pile is 1020 x 16mm, the rock penetration depth of the steel pipe pile is 3m, a steel reinforcement cage is installed in a pile core, and B20 concrete is poured. The arrangement range of the grouting quick-drying cement piles is 3 meters behind the dock wall and between adjacent anchor pull rods, the diameter of the 1 st row of piles is 800mm, the distance from the 1 st row of piles to the steel pipe piles is 650mm, the diameter of the 2 nd-5 th row of piles is 650mm, the horizontal distance between the centers of the piles is 560mm, the vertical distance is 500mm, the length varies from 1m to 23m according to the change of the bottom rock surface of the pile, the total length is 1852, and the total length is 29505 m.
By analyzing the pile foundation plane layout diagram of the project, it can be seen that anchor rods exist at the pile position of the project, and the pile position can only be arranged between the anchor rods under the influence of the anchor rods. When the water-stop pile is constructed, the actual position of the anchor pull rod is determined at first, and collision is avoided in a drilling hole.
In a certain Russian region of the project, geological conditions are complex, and the project is in a freeze-thaw alternative state all the year round, and the geological conditions of each layer are totally divided into 8 large layers, as shown in the following table 1:
TABLE 1 geological Condition parameter Table
The geological condition of the project can be seen through the table 2, the engineering geology contains more cobbles, and the project can touch obstacles such as stones in the drilling process and needs to use a pneumatic down-the-hole drill bit.
3. Improvement principle of frozen soil grouting
In winter, the frozen soil is like ice blocks in a frozen state, the volume of the frozen soil is expanded violently along with the reduction of the temperature, and the dock wall bears the lateral frost heaving force due to the restriction of the dock wall on frost heaving. In summer, the frozen soil is melted along with the rise of the temperature, so that the buildings built on the frozen soil section behind the dock wall are settled. In order to eliminate the influence of freeze thawing of the frozen soil layer, cement slurry made of Jet Fast grouting quick-drying cement which is a new material is adopted behind the dock wall to replace and improve the original frozen soil.
In the embodiment, the Jet Fast quick-drying cement has the characteristics of stability, foaming and quick setting, and can quickly form a porous honeycomb consolidation body after being injected into a soil layer, so that the effects of reducing the lateral soil pressure of the dock wall and preserving heat, resisting freezing and resisting seepage are achieved. The properties of the cement are compared with those of ordinary cement as shown in the following table:
TABLE 2 Cement Property comparison table
The frozen soil grouting improvement process is similar to a high-pressure jet grouting pile and is divided into two stages. In the first stage, Drilling 01 cement is used for leading holes, and drilled rock debris and undisturbed soil are led out to a sedimentation tank. When the well is formed, the undisturbed soil is displaced by 40-60%. Jet Fast cement grout is injected into the soil body at high pressure in the second stage, the mixture is stirred to enable undisturbed soil and cement paste to form a grouting well with a certain length and diameter, the mixture in the grouting well loses fluidity in 10 minutes and forms certain strength in 30 minutes, and the replacement rate of the stage to the undisturbed soil is not more than 75%.
In this embodiment, there is no difference from the application environment of the high-pressure jet grouting pile. The use of the "driling 01" cement is just like the bentonite of the cast-in-place pile, and plays a role of mud wall protection.
In this example, "driling 01" cement corresponds to bentonite/cement, and is specifically described as follows: the product model is as follows: drilling 01
Manufacturer information: similarly quick-setting cements, hydraulic cement manufacturing ltd, the website for the introduction of the russian holy petterburg product is:
https://geocem.spb.ru/catalog/gotovye-buroinektsionnye-materialy/
product-drilling/
driling 01 can be translated into bore hole bentonite No. 1.
The effect of the 'driling 01' cement is similar to that of domestic bentonite, and mainly plays a role in mud wall protection. It should be prior art that the present invention focuses on the use of quick setting cement and its construction process.
In the embodiment, through the replacement, the soil characteristics of original frost heaving soil are changed, the influence of lateral frost heaving force generated by soil frost heaving on the dock pipe pile dock wall can be effectively eliminated, and the problem of soil water seepage can be reduced. Meanwhile, as the formed new consolidation body is in a honeycomb shape, a large number of pores exist among consolidation soil bodies, and the function of the heat insulation layer on the dock wall can be achieved.
In this embodiment, the cellular soil is mainly and practically a consolidated body formed by observing the waste slurry.
4. Construction step and control key points
The frozen soil grouting technology can adopt single-pipe and double-pipe processes, and the single-pipe process can meet the use requirements of the project. The selection of the process is mainly selected according to the geological condition, the size of the pile diameter, the pile length and the cement consumption in the pre-construction test.
The engineering adopts single-layer and double-layer pipe construction, and the construction process flow is shown in figure 1.
The construction machinery adopts local machinery, and mainly comprises a Casagranded P700 type high-pressure grouting pump, an MIX 20 type automatic control stirrer, a HUTTE HBR-205II type drilling machine, a 20-square water tank, an air compressor and a diesel generator. The ground matched with a set of drilling machine needs 2500 levels, wherein the pulping ground is 100 square, the occupied area of each ton of material is 0.7 level, 3000 tons are needed each month, the material stacking ground needs 2100 levels, and the specific construction process is shown in figure 1 and comprises the following steps:
4.1 drilling mud
Drilling mud adopts 'Drilling 01' cement as flushing fluid, and compared with Drilling with clean water, the Drilling mud can effectively take out rock debris generated in Drilling in the mud circulation process, and has the function of mud wall protection after hole forming. A pile with a diameter of 650mm consumes 50kg of Drilling 01 for every 1m, and a pile with a diameter of 800mm consumes 90kg of Drilling 01.
TABLE 3 Drilling 01 Cement slurry index parameters
4.2 drilling and guniting
4.2.1 pile length
Because there is the difference in actual rock face and design rock face, the design pile length can only be as the reference, and actual pile length will be decided according to the rock face position:
(1) if the actual rock surface is lower than the designed pile length, the designed pile length is taken as a reference;
(2) and if the actual rock surface is higher than the designed pile length, drilling to the rock surface.
4.2.2 hole sites
Because the grouting improvement construction is carried out after the dock wall rock anchor is finished, careful measurement and point placement are carried out before drilling, and the drilling position is ensured to be staggered with the anchor rod position. Meanwhile, in order to prevent adjacent piles from jumping, jumping construction is adopted, and 3-4 hole sites are staggered between adjacent holes.
4.2.3 Pilot hole drilling
The whole drilling process of the drilling machine is matched with water, and a conical drill bit with the diameter of 112mm-151mm is adopted in a general soil layer. If the drilling process is stopped immediately when the drilling is obstructed by boulders, cobblestones and the like, the drill rod is lifted to replace the conical drill bit with a pneumatic down-the-hole drill bit with the diameter of 130mm-160mm, the drilling machine is connected with an air compressor through a hose, the air compressor outputs the pressure of 10MPa, after rock is punctured and wellhead rock debris is cleaned, the drill bit is replaced with the conical drill bit, and the drilling is continued to be performed to the position 0.4m below the designed elevation, so that a nozzle located 0.4m above the drill bit is located at the designed elevation. The drilling at this stage is pilot hole, aperture 132-.
4.2.4 lifting guniting
And after the designed elevation is reached, rotating the lifting drill rod, simultaneously starting a high-pressure pump to eject the cement slurry of 'driling 01' at high pressure through a 2-4mm nozzle, controlling the spraying pressure to be 15-25Mpa, carrying out pipe lifting and stopping once every 3-4cm, spraying the cement slurry for 5s, and carrying out pipe lifting at the speed of 20-25 cm/min.
4.3 grouting cement
The grouting cement adopts Jet Fast cement, whichAnd the pulping system 'driling 01' shares cement. Configuration 1m 3 The slurry of (2) requires about 1000kg Jet Fast cement, 700L water. The pile with the diameter of 650mm needs to consume 255kg of cement per meter, and the pile with the diameter of 800mm needs to consume 360kg of cement per meter.
TABLE 4 Jet Fast grout index parameters
In this example, a swelling test study was performed on quick-setting cement, specifically as follows: the quick-drying cement expansion test process comprises the following steps: firstly weighing 1kg of quick-drying cement, pouring the quick-drying cement into a stirring barrel, then pouring 700ml of water into the barrel by using a measuring cup, stirring the quick-drying cement for 180 +/-5 seconds by using a mortar stirrer, pouring the quick-drying cement into the measuring cup after minutes, standing the quick-drying cement, wherein the cement paste undergoes a chemical reaction and starts to expand in volume, the chemical reaction is finished after about 15 minutes, and the volume expansion coefficient is 1.8-2.5 times.
4.4 reset grouting
And after the pilot hole is finished, replacing a drill rod nozzle, lowering the conical drill bit to the designed elevation again, starting the high-pressure pump in order to prevent the nozzle from being blocked in the lowering process, and controlling the pressure to be about 10 Mpa. And after the designed elevation is reached, rotating and lifting the drill rod, simultaneously starting a high-pressure pump to eject Jet Fast cement slurry at high pressure through a nozzle with the diameter of 3.5-5mm, controlling the spraying pressure at 20Mpa, and carrying out pipe lifting for 5s every 3-4cm, wherein the pipe lifting speed is 20-25 cm/min.
4.5 acceptance and test detection
(1) In the drilling process, original perpendicularity data and drilling image data are kept, and the supervision owner can randomly check and detect the drilling object. After pile forming, extracting part of cement piles to excavate and accept elevation and verticality;
(2) before pumping, the consistency of the prepared cement slurry in each batch needs to be measured and the pumping pressure needs to be recorded, and the consistency and the pumping pressure cannot be lower than the designed performance index;
(3) in the process, arranging a specially-assigned person to carry out spot check on the water-cement ratio and the density of the cement paste, and making a ledger record;
(4) carrying out test block detection according to Russian national standard reverse OCT 5802-86, wherein a group of 6 blocks have the side length of 100 x 100mm, the design requirement is that the 28-day limit compressive strength is not lower than 0.3MPa, and the test block sampling is carried out according to the following principle:
1) sampling one group for each machine team of each drilling machine;
2) sampling at least one group of every 50 piles;
3) one group per 50 tons of each batch of fresh material.
According to the strength report of the test block for 7 days, the strength can reach more than 0.7Mpa, and the design requirement is met.
5 summary of the invention
The frozen soil grouting improvement technology adopts the Jet Fast cement which is a novel Russian material, improves the geological environment of a dock wall of a dock, ensures the safe conditions of the subsequent construction in the dock of an owner, and is fully determined by the owner. Meanwhile, a design and construction experience is provided for the company to relate to frozen soil treatment in Russian alpine region engineering in future.
In the invention, the quick-drying cement produced by Russia is selected, and the reason that the pressure of the lateral soil of the dock wall can be reduced is as follows: after the cement is used, the cement has the functions of foaming and playing gas, so that a consolidated body formed by the cement and soil forms a honeycomb-like structure, and the density of the foamed consolidated body is 300-500kg/m 3 Density of undisturbed soil 1600-1800kg/m 3 And the property and the specific gravity of the soil behind the wall are reduced, so that the lateral soil pressure of the dock wall is reduced.
The quick-drying cement can preserve heat and prevent freezing: because the formed consolidation body is of a honeycomb structure and is hollow inside, and because a large number of cavities exist, the heat conduction among soil bodies is reduced.
The reason for the impermeability is: because the cement contains the components of ordinary cement, and the surface of a consolidation body formed by soil has the capacity of absorbing water due to the existence of the cement.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. The application of the quick-drying cement in frozen soil grouting is characterized in that the quick-drying cement is used as grouting liquid for lifting and grouting and is used for construction of frozen soil grouting behind a dock wall.
2. The use of the quick setting cement of claim 1 in frozen soil grouting, wherein the quick setting cement improves replacement of original soil in frozen soil when the application is grouting of frozen soil behind a dock wall.
3. The use of a quick setting cement according to claim 2 in frozen soil grouting, said improvement in replacement wherein the grout containing the quick setting cement added during grouting has a replacement rate of 75% or less in the total original soil.
4. The use of the quick setting cement of claim 1 in frozen soil grouting, wherein the quick setting cement forms a cellular solid structure in frozen soil after grouting by a guniting solution, and the density of the cellular solid structure is 300- 3 。
5. Grouting method comprising the application according to claims 1-4, characterised in that it comprises the following steps: in the construction of the single-weight pipe, firstly, a mechanical construction mode is utilized, after a drilling mud hole reaches a set elevation, a high-pressure pump is utilized to lift and spray bentonite/cement, then quick-setting cement is utilized to prepare grouting cement, the cement grouting is carried out, and finally, the high-pressure pump is utilized to reset and grout the quick-setting cement through pressure.
6. Grouting method according to claim 5, characterised in that drilling with drilling mud is in particular: the bentonite/cement is drilled by using a pilot hole, is matched with water, and is drilled by using a conical drill bit with the diameter of 112mm-151 mm.
7. The grouting method according to claim 6, characterized in that in the pilot hole drilling machine, when an obstruction exists, the air compressor drives a drill bit in the drilling machine to drill holes.
8. The grouting method according to claim 5, wherein the lifting and guniting of the drilling bentonite/cement by using the high-pressure pump are specifically as follows: spraying the slurry with 15-25MPa and bentonite/cement as slurry.
9. The grouting method according to claim 5, wherein the quick setting cement is used for preparing grouting cement, and cement grouting is carried out, specifically: and (3) forming grouting cement by the quick-drying cement and water according to the water-cement ratio of 0.4-0.7, and grouting the grouting quick-drying cement.
10. The grouting method according to claim 5, wherein the pressure-resetting grouting of the grouting quick-setting cement by using the high-pressure pump is specifically as follows: and (3) carrying out resetting grouting on the grouting quick-drying cement through a high-pressure pump by using a 3.5-5mm nozzle under the grouting pressure of 15-25 Mpa.
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