CN110747840A - Vacuum combined surcharge-load prepressing soft foundation reinforcing construction method - Google Patents
Vacuum combined surcharge-load prepressing soft foundation reinforcing construction method Download PDFInfo
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- CN110747840A CN110747840A CN201911029242.2A CN201911029242A CN110747840A CN 110747840 A CN110747840 A CN 110747840A CN 201911029242 A CN201911029242 A CN 201911029242A CN 110747840 A CN110747840 A CN 110747840A
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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
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention relates to a construction method for reinforcing a soft foundation by vacuum combined preloading. The method comprises the following steps: s1: leveling a soft foundation treatment area, paving a sand layer on the soft foundation treatment area, and arranging a drainage plate and a clay curtain; s2: digging sealing ditches at two sides of the soft foundation treatment area, and paving sealing films in the sealing ditches; s3: arranging a main pipe and a branch pipe connected with the main pipe in the soft foundation treatment area, installing a main pipe film discharging device on the main pipe, and connecting a vacuum pumping device on a water outlet of the main pipe; s4: embedding the construction settlement observation plate, and performing vacuum preloading treatment on the soft foundation treatment area through a vacuumizing device to realize reinforcement of the soft foundation treatment area; s5: and carrying out preloading construction after the vacuum degree under the sealing film meets the design requirement. The method fills the sand layer in the soft foundation treatment area to form the surcharge mud layer for surcharge preloading, so that the method can not only accelerate the consolidation speed of the soft foundation, shorten the construction period, reduce the cost, but also ensure the stability of the site.
Description
Technical Field
The invention relates to a soft foundation reinforcing construction method, in particular to a vacuum combined surcharge preloading soft foundation reinforcing construction method.
Background
At present, many process methods for reinforcing and treating a soft foundation to raise the elevation of a site are available, and the process generally comprises the following steps: firstly, backfilling dredger fill on a site to a designed elevation; and then carrying out soft foundation reinforcement treatment by adopting a vacuum preloading method or a vacuum combined preloading method and other methods.
At present, the dredger fill is generally reinforced in the soft foundation reinforcement treatment process, and the vacuum combined preloading method is a common method, but the method has obvious defects: 1) the consolidation period is long, and the bearing capacity of the original soft foundation treatment area after consolidation is small; 2) if water is used as the stacking pressure, the bearing capacity of the dredger fill layer after the reinforcement treatment is limited (less than or equal to 80kPa), and the treatment depth is limited, so that the popularization and the application of the method are restricted to a certain extent; 3) if the mud bag is used as the stacking pressure, the mud bag needs to be removed after the reinforcement treatment, and the use is inconvenient.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a construction method for reinforcing a soft foundation by vacuum combined preloading; the method solves the technical problems of long treatment period, limited treatment depth and inconvenient use of the soft foundation reinforcement construction method in the prior art.
The invention discloses a vacuum combined preloading soft foundation reinforcement construction method, which adopts the technical scheme that:
a construction method for reinforcing a soft foundation by vacuum combined surcharge-load preloading comprises the following steps:
s1: leveling a soft foundation treatment area, paving a sand layer on the soft foundation treatment area, and arranging a drainage plate and a clay curtain;
s2: digging sealing ditches at two sides of the soft foundation treatment area, and paving sealing films in the sealing ditches;
s3: arranging a main pipe and a branch pipe connected with the main pipe in the soft foundation treatment area, installing a main pipe film discharging device on the main pipe, and connecting a vacuum pumping device on a water outlet of the main pipe;
s4: embedding the construction settlement observation plate, and performing vacuum preloading treatment on the soft foundation treatment area through a vacuumizing device to realize reinforcement of the soft foundation treatment area;
s5: and carrying out preloading construction after the vacuum degree under the sealing film meets the design requirement.
As a further improvement to the above technical solution, in step S4, a test vacuum is performed before the vacuum process to check the sealing film and the sealing groove for air leakage.
As a further improvement to the above technical solution, in step S1, a ground starting elevation is measured using a level gauge.
As a further improvement to the above technical solution, in step S3, the branch pipes have a plurality of branch pipes, the distance between two adjacent branch pipes is 6 meters, and each branch pipe is provided with a small hole every 5 centimeters along the axial direction.
As a further improvement to the above technical solution, in step S3, a PVC pipe with a diameter of 75mm is used for the main pipe, a PVC pipe with a diameter of 63mm is used for the branch pipe, and a water-permeable geotextile is wrapped around the branch pipe.
As a further improvement to the above technical solution, in step S2, the sealing film is made of three-layer rolled polyvinyl chloride films, and the thickness of each layer of rolled polyvinyl chloride film is 0.12 to 0.14 mm.
As a further improvement to the above technical solution, in step S1, the drainage plate is a C-shaped double-sided reverse filtration drainage plate with a width of 100mm and a thickness of 4.5 mm.
Compared with the prior art, the construction method for reinforcing the soft foundation by vacuum combined preloading has the beneficial effects that:
the construction method for reinforcing the soft foundation by vacuum combined preloading comprises the steps of arranging the sealing ditch in the soft foundation treatment area, paving the sealing film in the sealing ditch, filling the sand layer in the soft foundation treatment area to form a preloading mud layer for preloading, and draining water under the vacuum condition, so that the soft foundation consolidation speed can be increased, the construction period is shortened, the bearing capacity of the consolidated foundation is high, the original soft foundation treatment area can reach 130-170 kPa after consolidation, the consolidated mud layer can reach 60-80 kPa without covering water or sand bags on the consolidated mud layer, and in addition, the treatment depth of the pretreated foundation can be effectively increased due to the reinforcement under the vacuum condition.
The construction method for reinforcing the soft foundation by the vacuum combined preloading achieves the effect of the preloading combined vacuum preloading without preloading while lifting the height of the ground, is lower in cost, and can ensure the integral stability of the ground.
Drawings
FIG. 1 is a flow chart of the construction method for reinforcing the soft foundation by vacuum combined preloading of the invention;
FIG. 2 is a construction cross-sectional view of the construction method for reinforcing the soft foundation by vacuum combined preloading of the invention;
FIG. 3 is a process flow chart of the construction method for reinforcing the soft foundation by vacuum combined preloading of the invention;
in the figure: 1-a sand layer; 2-main pipe; 3-a vacuum pump; 4-cofferdam; 5-a check valve; 6-sealing the groove; 7-sealing film.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
The specific embodiment of the construction method for reinforcing the soft foundation by vacuum combined preloading of the invention, as shown in fig. 1 and 3, comprises the following steps:
s1: leveling a soft foundation treatment area, paving a sand layer 1 on the soft foundation treatment area, and arranging a drainage plate and a clay curtain;
s2: digging sealing ditches 6 at two sides of the soft foundation treatment area, and paving sealing films 7 in the sealing ditches 6;
s3: arranging a main pipe 2 and branch pipes connected with the main pipe 2 in a soft foundation treatment area, installing a film discharging device of the main pipe 2 on the main pipe 2, and connecting a vacuum pumping device on a water outlet of the main pipe 2;
s4: embedding the construction settlement observation plate, and performing vacuum preloading treatment on the soft foundation treatment area through a vacuumizing device to realize reinforcement of the soft foundation treatment area;
s5: and carrying out preloading construction after the vacuum degree under the sealing film meets the design requirement.
In step S4, before the main vacuum process, the initial value of the sedimentation is measured, and vacuum is tried to be performed to check the leakage of the sealing film 7 and the sealing groove 6.
In step S1, measuring the initial elevation of the ground, laying a 60cm thick sand cushion, and arranging a drainage plate and a clay curtain; the ground starting elevation is measured using a level gauge.
In step S3, the branch pipes are multiple, the distance between two adjacent branch pipes is 6 meters, and each branch pipe is provided with a small hole every 5 centimeters along the axial direction. In step S3, the main pipe 2 is a PVC pipe with a diameter of 75mm, and the branch pipe is a PVC pipe with a diameter of 63mm, and the branch pipe is wrapped with a water-permeable geotextile. In step S2, the sealing film 7 is made of three-layer rolled polyvinyl chloride films, and the thickness of each layer of rolled polyvinyl chloride film is 0.12 to 0.14 mm. In step S1, the drainage plate is a C-shaped double-sided reverse filtration drainage plate with a width of 100mm and a thickness of 4.5 mm.
In this embodiment, the main tube is connected to a check valve. Cofferdams are respectively arranged on the outer sides of the sealing ditches on the two sides of the soft foundation treatment area, and the cofferdams extend upwards to the upper side of the sand layer.
Specifically, as shown in fig. 2, the drainage mat layer is made of clean medium coarse sand, and the permeability coefficient is preferably greater than 5 × 10-3cm/s, the mud content should be less than 5%. The thickness of the drainage cushion layer is 0.6m, and the drainage cushion layer is at least 1.0m wider than the foundation treatment range. The main pipe 2 adopts a hard PVC pipe with the diameter phi of 75mm, the branch pipe adopts a hard PVC pipe with the diameter phi of 63mm, and the main pipe isThe rigidity of the pipe 2 and the branch pipe is not lower than 4KN/m2. The distance between the branch pipes is about 6m, a small hole with the diameter of 8-10 mm is drilled on each 5cm of the branch pipe, and the outside of each branch pipe is wrapped by less than 200g/m2The permeable geotextile.
In the embodiment, the vertical drainage body for soft foundation treatment is a plastic drainage plate, the type of the plastic drainage plate is SPB-C-FF-100-45 (C-shaped double-sided reverse filtration drainage plate with the width of 100mm and the thickness of 4.5 mm), the plastic drainage plate is made of a raw material and can measure the depth, the tensile strength of the composite body is greater than 1.5KN/10cm, and the quality standard of the composite body meets the regulation of road geosynthetic material drainage JT/T665-2006. The plastic drainage plate core plate has enough tensile strength and vertical drainage capacity, corrosion resistance and enough flexibility so as to ensure the durability of the plastic plate underground and prevent the plastic plate from being broken or cracked when being inserted and broken and the soil body is solidified and deformed. The plastic drainage plates are arranged in a quincunx shape, and the distance between the plastic drainage plates is 1.2 m. The plastic drainage plate is required to penetrate through a silt soft soil layer and a soft subjacent layer, and when the depth of the bottom surface of the soft soil layer exceeds 24.5 meters, the construction depth of the drainage plate is controlled according to 25 meters. When the permeable sand layer 1 exists in the lower covering soil layer, the distance between the plastic plate and the bottom surface of the soft soil layer is controlled to be not less than 50 cm.
In order to ensure the vacuum preloading effect, an isolation and sealing system is required to be arranged at the top and the periphery of the preloading area. Wherein, a sealing film 7 is arranged on the top of the horizontal drainage cushion layer, and a sealing ditch 6 and a clay sealing wall are arranged around the prepressing area.
The sealing film 7 is a 3-layer thickness 0.12-0.14 mm rolling type polyvinyl chloride film, the index of the rolling type polyvinyl chloride film meets the following table requirement, and 1 layer of the upper layer of the sealing film 7 is not less than 200g/m within the combined preloading range2The geotextile. The sealing ditch 6 should enter the clay layer below the underground water level by more than 0.5m and the bottom width is more than 0.5 m. The sealing wall adopts a phi 700mm single-row clay stirring pile, the pile and the pile are mutually overlapped by 200mm, the construction is carried out by adopting a four-stirring four-spraying mode, and the pile length of the stirring pile is controlled according to 10 m.
The vacuum degree under the vacuum combined surcharge preloading film is not less than 85kPa, and the bearing area of each jet vacuum pump 3 with 7.5kw is preferably 800-1200 m2。
The vacuumizing and combined surcharge preloading time is temporarily considered according to 4 months, and the actual preloading time is determined according to the construction monitoring condition.
And (3) vacuum combined preloading unloading standard: the actual measured settlement rate is less than or equal to 2.0mm/d or the foundation consolidation degree is more than or equal to 90 percent continuously for 10 days.
The invention provides a vacuum combined preloading soft foundation reinforcement construction method, compared with the prior art, the vacuum combined preloading soft foundation reinforcement construction method of the invention can accelerate the soft foundation consolidation speed and shorten the construction period by arranging a sealing ditch 6 in a soft foundation treatment area and paving a sealing film 7 in the sealing ditch 6, filling a sand layer 1 in the soft foundation treatment area to form a preloading mud layer for preloading, and then draining water under the vacuum condition, and the bearing capacity of the consolidated foundation is large, the original soft foundation treatment area can reach 130-170 kPa after consolidation, the loading mud layer can reach 60-80 kPa after consolidation without covering water or sand bags on the soft foundation treatment area, and in addition, the treatment depth of the pretreated foundation can be effectively improved because of the reinforcement under the vacuum condition.
The construction method for reinforcing the soft foundation by the vacuum combined preloading achieves the effect of the preloading combined vacuum preloading without preloading while lifting the height of the ground, is lower in cost, and can ensure the integral stability of the ground.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (7)
1. A vacuum combined surcharge-load prepressing soft foundation reinforcing construction method is characterized in that: the method comprises the following steps:
s1: leveling a soft foundation treatment area, paving a sand layer on the soft foundation treatment area, and arranging a drainage plate and a clay curtain;
s2: digging sealing ditches at two sides of the soft foundation treatment area, and paving sealing films in the sealing ditches;
s3: arranging a main pipe and a branch pipe connected with the main pipe in the soft foundation treatment area, installing a main pipe film discharging device on the main pipe, and connecting a vacuum pumping device on a water outlet of the main pipe;
s4: embedding the construction settlement observation plate, and performing vacuum preloading treatment on the soft foundation treatment area through a vacuumizing device to realize reinforcement of the soft foundation treatment area;
s5: and carrying out preloading construction after the vacuum degree under the sealing film meets the design requirement.
2. The vacuum combined surcharge preloading soft foundation reinforcement construction method according to claim 1, characterized in that: in step S4, a trial evacuation is performed to check for leakage of the sealing film and the sealing groove before the evacuation process.
3. The vacuum combined surcharge preloading soft foundation reinforcement construction method according to claim 1, characterized in that: in step S1, a ground start elevation is measured using a level gauge.
4. The vacuum combined surcharge preloading soft foundation reinforcement construction method as claimed in any one of claims 1 to 3, characterized in that: in step S3, the branch pipes are multiple, the distance between two adjacent branch pipes is 6 meters, and each branch pipe is provided with a small hole every 5 centimeters along the axial direction.
5. The vacuum combined surcharge preloading soft foundation reinforcement construction method as claimed in claim 4, wherein: in step S3, the main pipe is a PVC pipe with a diameter of 75mm, the branch pipe is a PVC pipe with a diameter of 63mm, and the branch pipe is wrapped with a permeable geotextile.
6. The vacuum combined surcharge preloading soft foundation reinforcement construction method as claimed in any one of claims 1 to 3, characterized in that: in step S2, the sealing film is made of three-layer rolled polyvinyl chloride films, and the thickness of each layer of rolled polyvinyl chloride film is 0.12 to 0.14 mm.
7. The vacuum combined surcharge preloading soft foundation reinforcement construction method as claimed in any one of claims 1 to 3, characterized in that: in step S1, the drainage plate is a C-shaped double-sided reverse filtration drainage plate with a width of 100mm and a thickness of 4.5 mm.
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| CN201911029242.2A CN110747840A (en) | 2019-10-25 | 2019-10-25 | Vacuum combined surcharge-load prepressing soft foundation reinforcing construction method |
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Cited By (3)
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| CN112411518A (en) * | 2020-12-17 | 2021-02-26 | 中交三公局第三工程有限公司 | Soft foundation section vacuum combined surcharge preloading construction method |
| CN112647488A (en) * | 2020-12-22 | 2021-04-13 | 杨志武 | Foundation drainage structure for highway bridge |
| CN112982360A (en) * | 2021-03-17 | 2021-06-18 | 中铁九局集团有限公司 | Construction method for treating soft soil roadbed by vacuum combined loading preloading method |
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|---|---|---|---|---|
| CN112411518A (en) * | 2020-12-17 | 2021-02-26 | 中交三公局第三工程有限公司 | Soft foundation section vacuum combined surcharge preloading construction method |
| CN112647488A (en) * | 2020-12-22 | 2021-04-13 | 杨志武 | Foundation drainage structure for highway bridge |
| CN112647488B (en) * | 2020-12-22 | 2022-02-01 | 杨志武 | Foundation drainage structure for highway bridge |
| CN112982360A (en) * | 2021-03-17 | 2021-06-18 | 中铁九局集团有限公司 | Construction method for treating soft soil roadbed by vacuum combined loading preloading method |
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Application publication date: 20200204 |