CN113186898A - Soft soil foundation reinforcement treatment method - Google Patents
Soft soil foundation reinforcement treatment method Download PDFInfo
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- CN113186898A CN113186898A CN202110390609.4A CN202110390609A CN113186898A CN 113186898 A CN113186898 A CN 113186898A CN 202110390609 A CN202110390609 A CN 202110390609A CN 113186898 A CN113186898 A CN 113186898A
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- soft soil
- soil foundation
- dewatering
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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 discloses a soft soil foundation reinforcement treatment method, which comprises the following steps: constructing a plurality of vertical dewatering wells in a soft soil foundation; arranging a plurality of perforated pipes between the two dewatering wells, and forming a transverse drainage and gas injection channel in the soft soil foundation through the perforated pipes; injecting gas into the dewatering well, wherein the gas enters each flower pipe through the dewatering well, and the surrounding soil body is punched through the openings of the flower pipes to form a water seepage channel flowing to the flower pipes; and under the action of the self weight of the soil body on the upper part of the floral tube, collecting underground water to the precipitation wells through the floral tube, pumping out the accumulated water in each precipitation well, and finishing consolidation settlement of the soft soil foundation. The invention avoids the problems of large earth volume and high secondary transportation cost required by conventional preloading, and the water seepage channels are formed along the depth direction through the perforated pipes, so that the water seepage channels are distributed more widely in the soft soil foundation, and the treatment period is greatly shortened.
Description
Technical Field
The invention is used in the field of foundation treatment, and particularly relates to a soft soil foundation reinforcement treatment method.
Background
The water content of the soft soil foundation is high, and the underground water in the soft foundation needs to be discharged and pumped away by using a certain engineering means before the engineering construction, so that the consolidation settlement is completed in advance. At present, the most commonly adopted mode in engineering is preloading or vacuum preloading. The method is characterized in that enough load (generally grading, piling soil in different periods) is placed on the ground of a soft foundation or a covering film body is vacuumized, and a certain number of vertical drainage bodies are driven into the soil. After certain time of stacking, underground water is discharged through the vertical drainage body, the foundation is solidified and settled, the bearing capacity and deformation meet the design requirements, and engineering construction can be carried out.
The prior art has the following defects:
(1) after the preloading is completed, the mound needs to be removed and transported outward, which causes secondary cost.
(2) The surcharge preloading often brings certain collapse risk due to nonstandard operation, and causes safety accidents.
(3) The permeability of the soft soil field is poor, only a vertical drainage channel is provided, the water in the soil body is not smoothly discharged, and the treatment period is generally long.
Disclosure of Invention
The invention aims to solve at least one technical problem in the prior art and provides a soft soil foundation reinforcement treatment method.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a soft soil foundation reinforcement treatment method comprises the following steps:
constructing a plurality of vertical dewatering wells in a soft soil foundation;
arranging a plurality of perforated pipes between the two dewatering wells, and forming a transverse drainage and gas injection channel in the soft soil foundation through the perforated pipes;
injecting gas into the dewatering well, wherein the gas enters each flower pipe through the dewatering well, and the surrounding soil body is punched through the openings of the flower pipes to form a water seepage channel flowing to the flower pipes;
and under the action of the self weight of the soil body on the upper part of the floral tube, collecting underground water to the precipitation wells through the floral tube, pumping out the accumulated water in each precipitation well, and finishing consolidation settlement of the soft soil foundation.
In some embodiments, the floral tube is disposed inside a soft soil foundation using a drag tube process.
In some embodiments, the dewatering wells are distributed in an equidistant square matrix in the soft soil foundation, and a plurality of the floral tubes form a cross-intercommunicated grid through the dewatering wells.
In some embodiments, a plurality of layers of the floral tubes are arranged between two of the precipitation wells in a depth direction.
In some embodiments, the spacing between adjacent floral tubes is 5-6 m.
In some embodiments, a gas injection pipeline is reserved in the dewatering well, then the well mouth is sealed, and gas is injected into the dewatering well through the gas injection pipeline.
In some embodiments, a high-pressure air pump is used for injecting air into the dewatering well, and the air pressure is not less than 5 MPa.
In some embodiments, the floral tube is a PVC floral tube.
One of the above technical solutions has at least one of the following advantages or beneficial effects: a horizontal drainage and gas injection channel is formed in the soft soil foundation through the perforated pipes, gas is injected into the interior of the dewatering well, and enters the perforated pipes through the dewatering well, and the surrounding soil is punched through the perforated pipes, so that the original soft soil structure is damaged, and a water seepage channel flowing to the perforated pipes is formed. And under the action of the self weight of the soil body on the upper part of the floral tube, collecting underground water to the precipitation wells through the floral tube, pumping out the accumulated water in each precipitation well, and finishing consolidation settlement of the soft soil foundation. The invention avoids the problems of large earth volume and high secondary transportation cost required by conventional preloading, and the water seepage channels are formed along the depth direction through the perforated pipes, so that the water seepage channels are distributed more widely in the soft soil foundation, and the treatment period is greatly shortened.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic plan view of one embodiment of the present invention;
FIG. 2 is a schematic elevational layout of one embodiment shown in FIG. 1.
Detailed Description
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
In the present invention, if directions (up, down, left, right, front, and rear) are described, it is only for convenience of describing the technical solution of the present invention, and it is not intended or implied that the technical features referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, it is not to be construed as limiting the present invention.
In the invention, the meaning of "a plurality" is one or more, the meaning of "a plurality" is more than two, and the terms of "more than", "less than", "more than" and the like are understood to exclude the number; the terms "above", "below", "within", "not less than" and the like are understood to include the essential numbers.
In the present invention, unless otherwise specifically limited, the terms "disposed," "mounted," "connected," and the like are to be understood in a broad sense, and for example, may be directly connected or indirectly connected through an intermediate; can be fixedly connected, can also be detachably connected and can also be integrally formed; may be mechanically coupled, may be electrically coupled or may be capable of communicating with each other; either as communication within the two elements or as an interactive relationship of the two elements. The specific meaning of the above-mentioned words in the present invention can be reasonably determined by those skilled in the art in combination with the detailed contents of the technical solutions.
In order to quickly and effectively treat deep soft soil foundation to meet the engineering construction requirements, referring to fig. 1 and 2, an embodiment of the invention provides a soft soil foundation reinforcement treatment method, which comprises the following steps:
a plurality of vertical dewatering wells 2 are driven into a soft soil foundation 1 in the field range by using equipment such as a rotary excavating machine, and the depth of each dewatering well 2 needs to be driven to the soft soil treatment depth;
a plurality of perforated pipes 3 are arranged between the two dewatering wells 2, the pipe walls of the perforated pipes 3 are densely provided with holes, and a transverse drainage and gas injection channel is formed inside the soft soil foundation 1 through the perforated pipes 3;
injecting gas into the dewatering well 2, wherein the gas enters each flower pipe 3 through the dewatering well 2, and punching surrounding soil bodies through the openings of the flower pipes 3 to form a water seepage channel flowing to the flower pipes 3;
under the action of the self weight of the soil body on the upper part of the floral tube 3, underground water is collected to the precipitation wells 2 through the floral tube 3, accumulated water in each precipitation well 2 is pumped out, and the consolidation settlement of the soft soil foundation 1 is completed.
A horizontal drainage and gas injection channel is formed inside the soft soil foundation 1 through the perforated pipes 3, gas is injected into the interior of the dewatering well 2, enters the perforated pipes 3 through the dewatering well 2, and the surrounding soil is punched through the holes of the perforated pipes 3, so that the original soft soil structure is damaged, and a water seepage channel flowing to the perforated pipes 3 is formed at the same time. Under the action of the self weight of the soil body on the upper part of the floral tube 3, underground water is collected to the precipitation wells 2 through the floral tube 3, accumulated water in each precipitation well 2 is pumped out, and the consolidation settlement of the soft soil foundation 1 is completed. The drainage system is simultaneously used as a gas injection system, and water seepage channels with considerable quantity are formed by cutting soil bodies through high-pressure gas, so that the drainage of underground water is accelerated. The problem of the required earthwork volume of conventional surcharge preloading is big, the secondary cost of transportation is high has been avoided, forms the infiltration passageway along the depth direction through floral tube 3 moreover, and the distribution of infiltration passageway in 1 inside soft soil foundation is wider, shortens the processing period greatly.
The perforated pipe 3 is arranged inside the soft soil foundation 1 by adopting a dragging pipe process, the length of the perforated pipe 3 is consistent with the distance between the two dewatering wells 2, and two ends of the perforated pipe 3 are respectively positioned inside the dewatering wells 2, so that communicated drainage and gas injection channels are formed inside the soft soil foundation 1.
The dewatering wells 2 are adjusted according to actual conditions, for example, in some embodiments shown in fig. 1, the diameter of the dewatering wells 2 is phi 0.8m, the dewatering wells 2 are distributed in an equidistant square matrix in the soft soil foundation 1, the horizontal distance of the dewatering wells 2 is 20m, the pipe diameters of the floral tubes 3 are phi 0.2m, and a plurality of floral tubes 3 form a spatial and three-dimensional cross-intercommunicated grid through the dewatering wells 2, so that the range and the capability of high-pressure gas for punching surrounding soil bodies are improved, and the water seepage capability of the deep soft soil foundation 1 is greatly improved.
In some embodiments, a plurality of layers of floral tubes 3 are arranged between two dewatering wells 2 along the depth direction, and the specific arrangement layer number and the specific distance can be adjusted according to the actual conditions of the project. For example, in some embodiments, the spacing between adjacent floral tubes 3 is between 5 and 6 m.
In order to conveniently inject gas into the dewatering well 2 and avoid gas overflow, a gas injection pipeline is reserved in the dewatering well 2, then the well mouth is plugged, and gas is injected into the dewatering well 2 through the gas injection pipeline. Further gas injection pipeline adopts high-pressure gas pump to pour into gas into precipitation well 2 inside, and atmospheric pressure is not less than 5Mpa to satisfy and destroy original soft soil structure, form the requirement that flows to 3 infiltration passageways of floral tube.
In some embodiments, the floral tube 3 is a PVC floral tube 3. The PVC perforated pipe 3 has better flexibility, and the arrangement of the perforated pipe 3 between the adjacent dewatering wells 2 is easier by combining the dragging pipe process.
In the description herein, references to the description of the term "example," "an embodiment," or "some embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The invention is not limited to the above embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the invention, and such equivalent modifications or substitutions are included in the scope of the claims of the present application.
Claims (8)
1. A soft soil foundation reinforcement treatment method is characterized by comprising the following steps:
constructing a plurality of vertical dewatering wells in a soft soil foundation;
arranging a plurality of perforated pipes between the two dewatering wells, and forming a transverse drainage and gas injection channel in the soft soil foundation through the perforated pipes;
injecting gas into the dewatering well, wherein the gas enters each flower pipe through the dewatering well, and the surrounding soil body is punched through the openings of the flower pipes to form a water seepage channel flowing to the flower pipes;
and under the action of the self weight of the soil body on the upper part of the floral tube, collecting underground water to the precipitation wells through the floral tube, pumping out the accumulated water in each precipitation well, and finishing consolidation settlement of the soft soil foundation.
2. A soft soil foundation reinforcement treatment method as claimed in claim 1, wherein said floral tube is disposed inside the soft soil foundation by a drag tube process.
3. The soft soil foundation reinforcement processing method of claim 1, wherein the dewatering wells are distributed in an equidistant matrix in the soft soil foundation, and a plurality of the floral tubes form a cross-intercommunicated grid through the dewatering wells.
4. A soft soil foundation reinforcement treatment method as claimed in claim 1, wherein a plurality of layers of said floral tubes are arranged between two of said precipitation wells in a depth direction.
5. A soft soil foundation reinforcement treatment method as claimed in claim 4, wherein the spacing between adjacent floral tubes is 5 to 6 m.
6. A soft soil foundation reinforcement processing method as claimed in claim 1, wherein a gas injection pipeline is reserved in the dewatering well, then the well mouth is plugged, and gas is injected into the dewatering well through the gas injection pipeline.
7. A soft soil foundation reinforcement processing method as claimed in claim 6, wherein a high pressure air pump is used to inject air into the dewatering well, and the air pressure is not less than 5 MPa.
8. A soft soil foundation reinforcement treatment method as claimed in claim 1, wherein said perforated pipe is a PVC perforated pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110390609.4A CN113186898A (en) | 2021-04-12 | 2021-04-12 | Soft soil foundation reinforcement treatment method |
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| CN202110390609.4A CN113186898A (en) | 2021-04-12 | 2021-04-12 | Soft soil foundation reinforcement treatment method |
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| CN113186898A true CN113186898A (en) | 2021-07-30 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006104714A (en) * | 2004-10-01 | 2006-04-20 | Kajima Corp | Method and device for preventing blocking of underground water pumping facility, and blocking preventive underground water pumping facility |
| CN101225654A (en) * | 2008-01-15 | 2008-07-23 | 同济大学 | Blow fill foundation treating method and gas injection draining method therefor |
| CN101357817A (en) * | 2008-09-11 | 2009-02-04 | 中国科学院武汉岩土力学研究所 | Stereoscopic network drainage for accelerating water drainage consolidation velocity of hydraulic mud fill sludge |
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2021
- 2021-04-12 CN CN202110390609.4A patent/CN113186898A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006104714A (en) * | 2004-10-01 | 2006-04-20 | Kajima Corp | Method and device for preventing blocking of underground water pumping facility, and blocking preventive underground water pumping facility |
| CN101225654A (en) * | 2008-01-15 | 2008-07-23 | 同济大学 | Blow fill foundation treating method and gas injection draining method therefor |
| CN101357817A (en) * | 2008-09-11 | 2009-02-04 | 中国科学院武汉岩土力学研究所 | Stereoscopic network drainage for accelerating water drainage consolidation velocity of hydraulic mud fill sludge |
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Application publication date: 20210730 |
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