CN113062296A - Vacuum preloading boundary sealing method - Google Patents
Vacuum preloading boundary sealing method Download PDFInfo
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- CN113062296A CN113062296A CN202110361291.7A CN202110361291A CN113062296A CN 113062296 A CN113062296 A CN 113062296A CN 202110361291 A CN202110361291 A CN 202110361291A CN 113062296 A CN113062296 A CN 113062296A
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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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- Agronomy & Crop Science (AREA)
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Abstract
The invention discloses a vacuum preloading boundary sealing method, which comprises the following steps: firstly, positioning an axis of an air-tight wall; determining the depth of the air-permeable soil layer; mixing backfill slurry, cutting a boundary plastic sealing film, connecting a weight at the lower end of the boundary plastic sealing film, excavating a closed air wall groove, and enabling the bottom of the closed air wall groove to penetrate through a breathable soil layer and enter a non-breathable soil layer; sealing plastic film on the inner side of the air-tight wall groove; backfilling slurry in the groove of the air-tight wall to form a slurry wall body, wherein the top surface of the slurry wall body is higher than the bottom surface of the air-permeable soil layer, and the boundary sealing plastic film and the slurry wall body form the air-tight wall; and sealing and connecting the top of the boundary sealing plastic film with the sealing film in the vacuum preloading area. When the permeable soil layer at the boundary of the vacuum prepressing soft foundation treatment area is thick, the method has the advantages of simple operation, convenient construction, economy, practicality, high reliability, capability of quickly forming sealing conditions at the boundary of the vacuum prepressing area and the like.
Description
Technical Field
The invention belongs to the technical field of vacuum preloading soft foundation treatment engineering, and particularly relates to a vacuum preloading boundary sealing method.
Background
The vacuum preloading reinforcement soft foundation requires good field sealing, 2-3 layers of sealing films are usually paved on the upper portion of a soil body to be reinforced in an engineering field to isolate the atmosphere, and the side face of the reinforced soil body is usually cut off by a film pressing ditch or a clay sealing wall and ensures the sealing performance inside the vacuum preloading area through fluid permeation of the soil body outside the reinforced area. The engineering community generally defines the permeability coefficient k<10-5And the soil layer of cm/s is regarded as an airtight soil layer, and the soil layer is regarded as an airtight soil layer on the contrary. When the soil body at the vacuum preloading boundary is a breathable soil layer, auxiliary sealing measures need to be added, such as film pressing ditches and clay sealing walls arranged on the periphery of the reinforced soil body.
When the air-permeable soil layer at the boundary of the vacuum prepressing soft foundation treatment area is shallow, the air-impermeable soil layer is easily dug through excavation, and the mode of manually digging a film pressing ditch can be adopted for sealing. The method comprises the steps of digging a groove at a vacuum preloading boundary, digging a permeable soil layer at the bottom of the groove, digging the groove to a depth of not less than 0.5m below the top surface of the impermeable soil layer, then embedding a sealing membrane for sealing at the upper part of a vacuum preloading area into a membrane pressing groove, and compacting with clay, so that the vacuum preloading area forms a closed environment.
When the air-permeable soil layer at the boundary of the vacuum prepressing soft foundation treatment area is thick, the air-impermeable soil layer is difficult to excavate, and the film pressing ditch sealing method is not applicable. In this case, the engineering industry usually applies a circle of clay sealing wall at the boundary of the vacuum preloading soft foundation treatment area for sealing. The clay sealing wall cuts and stirs the soil body up and down at the boundary of the vacuum preloading area through the stirring head of the stirrer, and slurry which is stirred in advance is pumped into the soil body which is loosened through the slurry pipe near the stirring head of the stirrer to be mixed. After the mud is mixed with the in-situ soil body, the permeability coefficient of the soil body can be reduced, the original permeable soil body is converted into the impermeable soil body to form a 'wall body', and then a sealing membrane at the upper part of the vacuum preloading area is embedded into the clay sealing wall body, so that the vacuum preloading area forms a closed environment, and the vacuum preloading soft foundation treatment effect is ensured. This method has the following disadvantages: (1) sampling soil at the boundary of a vacuum preloading area in advance, performing a mixing ratio test on site to determine the concentration of required slurry and the mixing ratio of clay during slurry mixing, and performing a mixing ratio test by sampling in sections when the difference of soil layers is large. (2) After the clay sealing wall is formed, the wall body needs to be sampled on site, and whether the permeability coefficient meets the airtight requirement or not is determined. (3) The clay sealing wall is formed by mixing slurry and in-situ soil at the vacuum preloading boundary, the clay content is low, and after the vacuum preloading air exhaust starts, clay particles with small particle sizes flow into a vacuum preloading area along the pores between soil bodies under the action of vacuum suction force, so that the clay particle content of the clay sealing wall is reduced, the permeability coefficient is increased, and the clay particles are even changed into a breathable wall body, so that the vacuum preloading loses a closed environment, and the vacuum preloading soft foundation treatment effect is influenced. (4) The clay sealing wall is usually prepared by mixing a 'wall body' by adopting a reciprocating up-and-down stirring method, so that the construction efficiency is low and the construction period is long. (5) For making things convenient for the seal membrane to bury the clay seal wall, the wall body mix completion can not be too of a specified duration when burying the seal membrane in the clay seal wall, otherwise the wall body is dry after, receives the influence of mud sclerosis effect, clay seal wall hardness grow, in the difficult buried clay seal wall of seal membrane. Therefore, in the engineering, a sealing membrane is usually paved in a vacuum preloading area, then a clay sealing wall is constructed, the clay sealing wall is constructed into a small section, the sealing membrane is embedded into the small section immediately, and a gradual pushing mode is adopted until all the sealing membranes are embedded into the wall body of the clay sealing wall. Therefore, not only is the physical strength and the energy of workers consumed, but also the construction period is prolonged.
In conclusion, the method for auxiliary sealing by using the clay sealing wall has the disadvantages of complicated construction process, large engineering investment, low reliability, low construction efficiency and long construction period, and the engineering benefit is seriously influenced.
Based on the problems, the method which has the advantages of simplicity in operation, convenience in construction, economy, practicability, high reliability, capability of quickly forming sealing conditions at the boundary of the vacuum preloading region and the like has important practical significance when the breathable soil layer at the boundary of the vacuum preloading soft foundation treatment region is thick.
Disclosure of Invention
The invention provides a vacuum preloading boundary sealing method which has the advantages of simple operation, convenient construction, economy, practicality, high reliability, capability of quickly forming sealing conditions at the boundary of a vacuum preloading region and the like when the breathable soil layer at the boundary of a vacuum preloading soft foundation treatment region is thicker for solving the technical problems in the known technology.
The technical scheme adopted by the invention for solving the technical problems in the prior art is as follows: a vacuum preloading boundary sealing method comprises the following steps: firstly, positioning an axis of an air-tight wall; determining the depth of the air-permeable soil layer; mixing backfill slurry, cutting a boundary plastic sealing film, connecting a weight at the lower end of the boundary plastic sealing film, excavating a closed air wall groove, and enabling the bottom of the closed air wall groove to penetrate through a breathable soil layer and enter a non-breathable soil layer; sealing plastic film on the inner side of the air-tight wall groove; backfilling slurry in the groove of the air-tight wall to form a slurry wall body, wherein the top surface of the slurry wall body is higher than the bottom surface of the air-permeable soil layer, and the boundary sealing plastic film and the slurry wall body form the air-tight wall; and sealing and connecting the top of the boundary sealing plastic film with the sealing film in the vacuum preloading area.
And step three, enabling the bottom of the air-tight wall groove to enter a position 0.9-1.2 m below the top surface elevation of the air-tight soil layer, and enabling the width of the air-tight wall groove to be 0.2-0.3 m.
Fifthly, the top surface of the slurry wall body is higher than the bottom surface of the air permeable soil layer by at least 1 m.
And thirdly, adopting a rod piece for weighing the weight, wherein the rod piece is coiled and hung at the bottom of the boundary sealing plastic film.
And thirdly, backfilling slurry is prepared by adding water into the unglazed clay and stirring, wherein the ratio of the unglazed clay to the water by volume is 0.4: 1-0.5: 1.
And fourthly, reserving 2-3 m on the top of the boundary sealing plastic film on the ground.
And sixthly, adhering the top of the boundary sealing plastic film and the sealing film of the vacuum preloading area by using strong glue.
The invention has the advantages and positive effects that: (1) when the air-permeable soil layer at the boundary of the vacuum preloading soft foundation treatment area is thicker, the method does not need to carry out a mix proportion test along the boundary soil sample of the vacuum preloading soft foundation treatment area to determine the concentration of the required slurry and the mixing proportion of the clay during slurry mixing like the traditional clay sealing wall process, and only needs to determine the thickness of the air-permeable soil layer in a drilling and touching mode. (2) The wall body of the airtight wall consists of slurry with small permeability coefficient and a plastic film embedded in the airtight wall, and the plastic film is matched with the slurry, so that the airtight effect is better. Need not to take a sample the wall body after the wall body forms like traditional clay sealing wall, determine whether its osmotic coefficient satisfies airtight requirement. (3) According to the invention, under the blocking of the plastic film, the slurry backfilled in the groove of the air-tight wall, fine clay particles can not move to the reinforcing area under the action of vacuum suction, and the sealing reliability is improved. (4) The air-tight wall does not need to be mixed with a wall body by adopting a reciprocating up-and-down stirring method like the traditional clay sealing wall, only needs to be slotted by a flexible slotting machine, and only needs to backfill the mixed slurry by a slurry pump after plastic films are put in, so that the construction efficiency is higher. (5) The method can be carried out in advance by excavating the groove of the air-tight wall, firstly, one end of a cut small block-shaped plastic film is buried in the air-tight wall, the width of the other end of the small block-shaped plastic film is reserved on the ground surface by 2-3 m, and then slurry is backfilled in the groove of the air-tight wall. After the sealing film in the vacuum preloading area is laid, the overground reserved section of the plastic film is tightly bonded with the sealing film in the vacuum preloading area by using the super glue, so that the vacuum preloading area forms a closed area, and the method is convenient and rapid; meanwhile, the operation in the vacuum preloading area and the operation of the air-tight wall can be constructed in parallel, and the effect of saving the construction period can be achieved.
In conclusion, the method has the advantages of simple operation, convenient construction, economy, practicability, high reliability, capability of quickly forming the sealing condition at the boundary of the vacuum preloading area and better engineering benefit.
Drawings
FIG. 1 is a schematic structural diagram of an application of the present invention;
FIG. 2 is a schematic view of the attachment of the border seal plastic film to the plumbing fixture of the present invention.
In the figure: 1. a vertical weight bar member; 2. a border seal plastic film; 3. an air-tight wall; 4. an air-blocking wall groove; 5. a breathable soil layer; 6. a gas impermeable soil layer; 7. a mud wall body; 8. sealing the membrane in the vacuum preloading area; 9. and (4) the ground.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:
referring to fig. 1 to 2, a vacuum preloading boundary sealing method includes the following steps:
firstly, positioning an axis of an air-tight wall: the method adopted by the embodiment comprises the following steps: and (4) lofting a vacuum preloading reinforcing area side line by adopting measuring equipment according to a design drawing, and taking the vacuum preloading reinforcing area side line as an axis of the air-tight wall 3.
Determining the depth of the breathable soil layer 5: the method adopted by the embodiment comprises the following steps: arranging a probing hole every 50m along the axis of the air-tight wall, sampling the soil body, and measuring the permeability coefficient of the soil body, wherein the permeability coefficient is more than 10-5And cm/s is the air-permeable soil layer 5, otherwise, the air-impermeable soil layer 6, the thickness of the air-permeable soil layer 5 is determined according to the cm/s, and the top elevation of the air-impermeable soil layer 6 is further determined.
Thirdly, mixing and preparing slurry for backfilling, cutting the boundary plastic sealing film 2, connecting a weight at the lower end of the boundary plastic sealing film, excavating an air-tight wall groove 4, and enabling the bottom of the air-tight wall groove 4 to penetrate through a breathable soil layer 5 and enter a non-breathable soil layer 6.
In this embodiment, the method for mixing the slurry is as follows: and excavating a slurry stirring pool near the engineering position, wherein the size of the slurry stirring pool is determined according to the quantity of slurry to be mixed. After the slurry stirring pool is dug, clay and water are poured inwards, and the volume ratio of the clay to the water is 0.4: 1-0.5: 1. Then stirring the mixture by a stirrer to prepare slurry for backfilling.
In the embodiment, the cutting method of the boundary plastic sealing film 2 comprises the following steps: and cutting the whole plastic film into a long-strip-shaped boundary sealing plastic film 2, wherein the length of the boundary sealing plastic film 2 is the length of a side line of a vacuum preloading reinforcement area, and the width is the distance from the ground to the top surface of an airtight soil layer 6 and the margin length is 2-3 m. The bottom of the cut boundary sealing plastic film 2 is wound and hung on a weight rod 1 to be used as a weight.
In this embodiment, the method for excavating the air-tight wall groove 4 includes: and (3) slotting along the axis of the air-tight wall positioned in the step I by adopting a special reciprocating slot sawing machine to form an air-tight wall groove 4. The depth of the air-tight wall groove 4 should penetrate through the air-permeable soil layer 5 and enter the height of the top surface of the air-tight soil layer 6 to be 1.0m below, and the width of the air-tight wall groove 4 is 0.2-0.3 m.
And fourthly, vertically lining a boundary sealing plastic film 2 on the inner side of the air-tight wall groove, wherein the boundary sealing plastic film 2 is tightly attached to the inner side groove wall of the air-tight wall groove 4. In the embodiment, the top of the boundary sealing plastic film 2 is reserved with a length of 2-3 m on the ground 9 at one side of the vacuum preloading area at the top of the airtight wall groove 4, so that the top of the boundary sealing plastic film can be conveniently connected with the sealing film 8 of the vacuum preloading area in the subsequent process.
And fifthly, backfilling slurry in the groove 4 of the air-tight wall to form a slurry wall body 7, wherein the top surface of the slurry wall body 7 is higher than the bottom surface of the air-permeable soil layer 5, and the boundary sealing plastic film 2 and the slurry wall body 7 form the air-tight wall 3.
In the embodiment, the mixed slurry is pumped into the air-tight wall groove 4 by a slurry pump, and the top elevation of the slurry wall body 7 in the air-tight wall groove 4 is at least 1m higher than the bottom elevation of the air-permeable soil layer 5.
And sixthly, the top of the boundary sealing plastic film 2 is hermetically connected with the vacuum preloading area sealing film 8.
The method adopted by the embodiment comprises the following steps: and (3) bonding the ground reserved section of the boundary sealing plastic film 2 positioned on one side of the vacuum preloading area at the top of the air-tight wall groove 4 with the vacuum preloading area sealing film 8 in the vacuum preloading area at the lap joint by using strong glue, ensuring no air leakage and ensuring that the bonding width is not less than 1 m.
Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and those skilled in the art can make many modifications without departing from the spirit and scope of the present invention as defined in the appended claims.
Claims (7)
1. A vacuum preloading boundary sealing method is characterized by comprising the following steps:
firstly, positioning an axis of an air-tight wall;
determining the depth of the air-permeable soil layer;
mixing backfill slurry, cutting a boundary plastic sealing film, connecting a weight at the lower end of the boundary plastic sealing film, excavating a closed air wall groove, and enabling the bottom of the closed air wall groove to penetrate through a breathable soil layer and enter a non-breathable soil layer;
sealing plastic film on the inner side of the air-tight wall groove;
backfilling slurry in the groove of the air-tight wall to form a slurry wall body, wherein the top surface of the slurry wall body is higher than the bottom surface of the air-permeable soil layer, and the boundary sealing plastic film and the slurry wall body form the air-tight wall;
and sealing and connecting the top of the boundary sealing plastic film with the sealing film in the vacuum preloading area.
2. The vacuum preloading boundary sealing method of claim 1, wherein the bottom of the air-tight wall groove is 0.9-1.2 m below the top surface elevation of the airtight soil layer, and the width of the air-tight wall groove is 0.2-0.3 m.
3. The vacuum preloading boundary sealing method of claim 1, wherein the elevation of the top surface of the slurry wall body is at least 1m higher than the bottom surface of the air permeable soil layer.
4. The vacuum preloading boundary sealing method of claim 1, wherein the weight is a rod member, and the rod member is wound on the bottom of the boundary sealing plastic film.
5. The vacuum preloading boundary sealing method according to claim 1, wherein the backfill slurry is prepared by adding water into the vegetarian clay and stirring, and the volume ratio of the vegetarian clay to the water is 0.4: 1-0.5: 1.
6. The vacuum preloading boundary sealing method according to claim 1, wherein the top of the boundary sealing plastic film is reserved for 2-3 m on the ground.
7. The vacuum preloading boundary sealing method according to claim 1, wherein the top of the boundary sealing plastic film is adhered to the vacuum preloading region sealing film by means of super glue.
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Cited By (1)
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| CN113832953A (en) * | 2021-10-25 | 2021-12-24 | 广州市设计院集团有限公司 | Method for reducing influence of vacuum preloading on surrounding environment |
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