CN111485546A - Vacuum preloading reinforcement method suitable for hydraulic filling soft soil foundation - Google Patents
Vacuum preloading reinforcement method suitable for hydraulic filling soft soil foundation Download PDFInfo
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- CN111485546A CN111485546A CN202010312451.4A CN202010312451A CN111485546A CN 111485546 A CN111485546 A CN 111485546A CN 202010312451 A CN202010312451 A CN 202010312451A CN 111485546 A CN111485546 A CN 111485546A
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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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- 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
- E02D3/103—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains by installing wick drains or sand bags
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- 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 vacuum preloading consolidation method suitable for a hydraulic filling soft soil foundation, which comprises the steps of flattening undisturbed soil and paving non-woven geotextile; laying a lower horizontal drainage layer, wherein the lower horizontal drainage layer comprises a lower vacuum pipe network and an upper sand bag layer; laying dredger fill to a preset height; arranging a drainage plate, enabling the lower end of the drainage plate to penetrate through a lower horizontal drainage layer to reach undisturbed soil, reserving the upper end of the drainage plate, and laying non-woven geotextile; laying an upper horizontal drainage layer, wherein the upper horizontal drainage layer has the same structure as the lower horizontal drainage layer, and the upper end of the drainage plate penetrates through the upper horizontal drainage layer; laying clay for sealing, and embedding the upper end of the drainage plate below the middle of the clay; and selecting the number of the vacuum pumps to be put in according to the construction requirements, starting the vacuum pumps, and enabling water in the soft soil to flow out of the vacuum pumps through the drainage plates and the upper and lower horizontal drainage layers to realize soft soil consolidation. The method improves the vacuum degree diffusion efficiency, the integrity of the horizontal drainage layer and the sealing effect.
Description
Technical Field
The invention belongs to the field of foundation construction, and particularly relates to a vacuum preloading consolidation method suitable for a hydraulic filling soft soil foundation.
Background
The vacuum preloading technology is one of the important methods for effectively reinforcing the soft clay foundation, and the traditional vacuum preloading process comprises the following steps: the sand cushion layer is laid on the soil body, the drainage plate is arranged, the vacuum pipe network is arranged, the sealing film is laid, the vacuum pump is started to vacuumize, the soil body generates negative pressure, under the action of the internal and external pressure difference, the pore water pressure of the soil body is gradually dissipated, the effective stress of soil particles is increased, and the soil body is compacted tightly to achieve the expected reinforcement effect. The traditional vacuum preloading method has the defects in practical application: 1) the vacuum degree is not uniformly diffused and attenuated along the depth of the soil body, the soil body is not uniformly reinforced, and the soil body is soft at the upper part and hard at the lower part; 2) the vacuum preloading method is difficult to implement, and the sealing film leaks air, so that vacuum loss is easily caused and the consolidation effect is poor.
Disclosure of Invention
The invention aims to provide a vacuum preloading reinforcement method suitable for hydraulic filling of a soft soil foundation, which improves the vacuum degree diffusion efficiency, the integrity of a horizontal drainage layer and the sealing effect.
The technical scheme adopted by the invention is as follows:
a vacuum preloading consolidation method suitable for blow-filling soft soil foundation comprises the following steps:
s1, flattening undisturbed soil, and paving a non-woven geotextile;
s2, laying a lower horizontal drainage layer, wherein the lower horizontal drainage layer comprises a lower vacuum pipe network and an upper sand bag layer, the vacuum pipe network is arranged crosswise, water pumping holes are distributed on the vacuum pipes and are wrapped by non-woven geotextile bound and fixed on the vacuum pipes, and the end parts of the vacuum pipe network are connected to a vacuum pump;
s3, laying dredger fill to a preset height;
s4, arranging a drainage plate, penetrating the lower end of the drainage plate through a lower horizontal drainage layer to undisturbed soil, reserving the upper end of the drainage plate, and laying non-woven geotextile;
s5, laying an upper horizontal drainage layer, wherein the upper horizontal drainage layer has the same structure as the lower horizontal drainage layer, and the upper end of the drainage plate penetrates through the upper horizontal drainage layer;
s6, paving clay for sealing, and embedding the upper end of the drainage plate below the middle of the clay;
s7, selecting the number of vacuum pumps to be put in according to construction requirements, starting the vacuum pumps, and enabling water in the soft soil to flow out of the vacuum pumps through the drainage plates and the upper and lower horizontal drainage layers to achieve soft soil consolidation.
Furthermore, the end part of the vacuum pipe network is provided with a sealing element in the middle of the clay, the sealing element comprises a round pipe and a round cover which are sleeved on the vacuum pipe, the inner diameter of the round pipe is slightly larger than the outer diameter of the vacuum pipe, the round pipe and the vacuum pipe are fixed by adhesion, and the convex surface of the round cover faces upwards, the concave surface of the round cover faces downwards and is welded and fixed with the top end.
Further, in step S1, after the undisturbed soil is leveled, sharp objects on the undisturbed soil are removed before the non-woven geotextile is laid.
Further, in step S3, after the dredger fill is laid to a predetermined height, if the strength of the dredger fill does not satisfy the construction work requirement, the vacuum pump is started in advance to perform drainage consolidation on the dredger fill.
Further, in steps S1 and S4, a double-layer non-woven geotextile is laid.
Furthermore, in the vacuum pipe network, the distance between the vacuum pipes is 1-2 m, and water pumping holes with the diameter of more than 0.5cm are arranged along the vacuum pipes every 3-5 cm.
Further, in the vacuum pipe network, the vacuum pipes are connected in series through two-way or three-way pipes at the end parts and finally converge to the vacuum pump.
Furthermore, the sand of the sand bag layer is filled by sacks, every two sacks are bound, and the thickness of each sack is not less than 10 cm.
Further, the clay thickness is 0.5m or more.
Further, the vacuum pump is a jet pump.
The invention has the beneficial effects that:
by adopting the method of vacuumizing and draining the upper and lower layers of the reinforced soil body, the vacuum degree is uniformly diffused from the upper and lower horizontal drainage layers to the middle soil body, the diffusion efficiency of the vacuum degree is improved, the phenomenon that the vacuum degree is attenuated along the depth in the traditional vacuum preloading is avoided, and the drainage efficiency and the soil body reinforcing effect are improved; the sand bag layer and the vacuum pipe network are combined to replace the traditional method that the vacuum pipe network is buried in the sand cushion layer, so that the integrity of the horizontal drainage layer is improved under the condition of uneven settlement of the soil body; the clay replaces a polyethylene sealing film, so that the sealing effect is improved, and the implementation difficulty is reduced; the number of the vacuum pumps which are put into the system is selected according to construction requirements, so that the drainage efficiency and the consolidation effect are improved; the whole construction process is simple and convenient, and great economic benefit and social value can be created.
Drawings
FIG. 1 is a cross-sectional view of a dredger fill reinforcement according to an embodiment of the invention.
Figure 2 is a perspective view of a dredger fill reinforcement according to an embodiment of the invention.
FIG. 3 is a diagram of a drainage system in an embodiment of the invention.
Fig. 4 is a diagram of a vacuum pipe network arrangement in an embodiment of the present invention.
Figure 5 is a schematic view of a vacuum tube in an embodiment of the present invention.
FIG. 6 is a schematic view of a vacuum tube and seal in an embodiment of the present invention.
In the figure: 1-clay; 2-a drainage plate; 3-a sand bag layer; 4-vacuum pipe network; 5-nonwoven geotextile; 6-a seal; 7-dredger fill; 8-a vacuum pump; 9-undisturbed soil; 10-water pumping holes; 11-binding a rope; 12-a circular cover; 13-fixing glue; 14-round tube; a-two-way connection; b-tee joint.
Detailed Description
The invention is further described below with reference to the figures and examples.
As shown in fig. 1 to 5, a vacuum preloading consolidation method suitable for hydraulic filling soft soil foundation includes the steps of:
s1, leveling undisturbed soil 9, and paving a non-woven geotextile 5;
s2, laying a lower horizontal drainage layer, wherein the lower horizontal drainage layer comprises a lower vacuum pipe network 4 and an upper sand bag 3, the vacuum pipe network 4 is arranged crosswise, water pumping holes 10 are distributed on the vacuum pipes, the water pumping holes 10 are wrapped by non-woven geotextile 5 bound and fixed on the vacuum pipes, and the end parts of the vacuum pipe 4 network are connected to a vacuum pump 8;
s3, laying dredger fill 7 to a preset height;
s4, arranging the drainage plate 2, enabling the lower end of the drainage plate 2 to penetrate through a lower horizontal drainage layer to reach undisturbed soil 9, reserving the upper end of the drainage plate, and laying the non-woven geotextile 5;
s5, laying an upper horizontal drainage layer, wherein the upper horizontal drainage layer has the same structure as the lower horizontal drainage layer, and the upper end of the drainage plate 2 penetrates through the upper horizontal drainage layer;
s6, laying clay 1 for sealing, and embedding the upper end of the drainage plate 2 below the middle of the clay 1;
s7, selecting the number of the vacuum pumps 8 to be put in according to construction requirements, starting the vacuum pumps 8, and enabling water in the soft soil to flow out of the vacuum pumps 8 through the drainage plates 2 and the upper and lower horizontal drainage layers to realize soft soil consolidation.
By adopting the method of vacuumizing and draining the upper and lower layers of the reinforced soil body, the vacuum degree is uniformly diffused from the upper and lower horizontal drainage layers to the middle soil body, the diffusion efficiency of the vacuum degree is improved, the phenomenon that the vacuum degree is attenuated along the depth in the traditional vacuum preloading is avoided, and the drainage efficiency and the soil body reinforcing effect are improved; the sand bag layer 3 and the vacuum pipe network 4 are combined to replace the traditional method that the vacuum pipe network 4 is buried in a sand cushion layer, so that the integrity of the horizontal drainage layer is improved under the condition of uneven settlement of a soil body; the clay 1 replaces a polyethylene sealing film, so that the sealing effect is improved, and the implementation difficulty is reduced; the number of the vacuum pumps 8 is selected according to construction requirements, so that the drainage efficiency and the consolidation effect are improved; the whole construction process is simple and convenient, and great economic benefit and social value can be created.
As shown in fig. 1 and fig. 6, in the present embodiment, a sealing member 6 is disposed at the end of the vacuum pipe network 4 at the middle position of the clay 1, the sealing member 6 includes a circular tube 14 and a circular cover 12 (preferably made of stainless steel material) which are sleeved on the vacuum pipe, the inner diameter of the circular tube 14 is slightly larger than the outer diameter of the vacuum pipe and the two are fixed by gluing, and the circular cover 12 has an upward convex surface and a downward concave surface and is fixed by welding with the top end of the circular tube. The unique sealing element structure can avoid air leakage of gaps between the vacuum tube and the clay 1.
As shown in fig. 4, in the present embodiment, in the vacuum pipe network 4, the vacuum pipes are connected in series through two-way a or three-way B at the end, and finally converge to the vacuum pump 8.
In the present embodiment, after leveling the undisturbed soil 9, sharp objects on the undisturbed soil 9 are removed before laying the nonwoven geotextile 5 in step S1.
In the present embodiment, after the dredger fill 7 is laid to a predetermined height in step S3, if the strength of the dredger fill 7 does not satisfy the construction work requirement, the vacuum pump 8 is started in advance to perform drainage consolidation on the dredger fill 7.
In the present embodiment, in steps S1 and S4, the double-layer nonwoven geotextile 5 is laid.
In the embodiment, in a vacuum pipe network 4, the distance between vacuum pipes is 1-2 m, and water pumping holes 10 with the diameter of more than 0.5cm are arranged along the vacuum pipes every 3-5 cm; the sand of the sand bag layer 3 is filled by sacks, every two sacks are bound, and the thickness of each sack is not less than 10 cm; the thickness of the clay 1 is more than 0.5 m; the vacuum pump 8 is a jet pump.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that many modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A vacuum preloading reinforcement method suitable for hydraulic filling soft soil foundation is characterized in that: comprises the steps of (a) carrying out,
s1, flattening undisturbed soil, and paving a non-woven geotextile;
s2, laying a lower horizontal drainage layer, wherein the lower horizontal drainage layer comprises a lower vacuum pipe network and an upper sand bag layer, the vacuum pipe network is arranged crosswise, water pumping holes are distributed on the vacuum pipes and are wrapped by non-woven geotextile bound and fixed on the vacuum pipes, and the end parts of the vacuum pipe network are connected to a vacuum pump;
s3, laying dredger fill to a preset height;
s4, arranging a drainage plate, penetrating the lower end of the drainage plate through a lower horizontal drainage layer to undisturbed soil, reserving the upper end of the drainage plate, and laying non-woven geotextile;
s5, laying an upper horizontal drainage layer, wherein the upper horizontal drainage layer has the same structure as the lower horizontal drainage layer, and the upper end of the drainage plate penetrates through the upper horizontal drainage layer;
s6, paving clay for sealing, and embedding the upper end of the drainage plate below the middle of the clay;
s7, selecting the number of vacuum pumps to be put in according to construction requirements, starting the vacuum pumps, and enabling water in the soft soil to flow out of the vacuum pumps through the drainage plates and the upper and lower horizontal drainage layers to achieve soft soil consolidation.
2. The vacuum preloading consolidation method suitable for blow-filling soft soil foundations as claimed in claim 1, characterized in that: the end part of the vacuum pipe network is provided with a sealing element in the middle of the clay, the sealing element comprises a round pipe and a round cover which are sleeved on the vacuum pipe, the inner diameter of the round pipe is slightly larger than the outer diameter of the vacuum pipe, the round pipe and the round cover are fixed by adhesion, and the convex surface of the round cover faces upwards, the concave surface of the round cover faces downwards and is welded and fixed with the.
3. The vacuum preloading consolidation method suitable for blow-filling soft soil foundations as claimed in claim 1, characterized in that: in step S1, after the undisturbed soil is leveled, sharp objects on the undisturbed soil are removed before the non-woven geotextile is laid.
4. The vacuum preloading consolidation method suitable for blow-filling soft soil foundations as claimed in claim 1, characterized in that: in step S3, after the dredger fill is laid to a predetermined height, if the strength of the dredger fill does not satisfy the construction work requirement, the vacuum pump is started in advance to perform drainage consolidation on the dredger fill.
5. The vacuum preloading consolidation method suitable for blow-filling soft soil foundations as claimed in claim 1, characterized in that: in steps S1 and S4, a double-layer non-woven geotextile is laid.
6. The vacuum preloading consolidation method suitable for blow-filling soft soil foundations as claimed in claim 1, characterized in that: in a vacuum pipe network, the distance between vacuum pipes is 1-2 m, and water pumping holes with the diameter of more than 0.5cm are arranged along the vacuum pipes every 3-5 cm.
7. The vacuum preloading consolidation method suitable for blow-filling soft soil foundations as claimed in claim 1, characterized in that: in a vacuum pipe network, vacuum pipes are connected in series through two-way or three-way pipes at the end parts and finally converge to a vacuum pump.
8. The vacuum preloading consolidation method suitable for blow-filling soft soil foundations as claimed in claim 1, characterized in that: the sand of the sand bag layer is filled by sacks, every two sacks are bound, and the thickness of each sack is not less than 10 cm.
9. The vacuum preloading consolidation method suitable for blow-filling soft soil foundations as claimed in claim 1, characterized in that: the thickness of the clay is more than 0.5 m.
10. The vacuum preloading consolidation method suitable for blow-filling soft soil foundations as claimed in claim 1, characterized in that: the vacuum pump is a jet pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010312451.4A CN111485546A (en) | 2020-04-20 | 2020-04-20 | Vacuum preloading reinforcement method suitable for hydraulic filling soft soil foundation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010312451.4A CN111485546A (en) | 2020-04-20 | 2020-04-20 | Vacuum preloading reinforcement method suitable for hydraulic filling soft soil foundation |
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| CN111485546A true CN111485546A (en) | 2020-08-04 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070048088A1 (en) * | 2003-05-28 | 2007-03-01 | Baggermaatschappij Boskalis B.V. | Method and assembly for withdrawing or supplying substances from/to a soil body |
| CN201305846Y (en) * | 2008-11-28 | 2009-09-09 | 天津市水利科学研究所 | Double-layer low- order vacuum prepressing reinforcing device |
| CN201538964U (en) * | 2009-11-30 | 2010-08-04 | 曾国海 | Ultra-soft foundation shallow layer stacking and reinforcing system |
| KR20120126480A (en) * | 2011-05-12 | 2012-11-21 | 김용묵 | Environment-friendly horizontal drain apparatus |
| CN103981853A (en) * | 2014-05-21 | 2014-08-13 | 浙江大学城市学院 | Vacuum preloading device and soil molding process of remolding soil |
| CN109653188A (en) * | 2019-01-10 | 2019-04-19 | 天津城建大学 | A kind of vacuum prepressing device and its construction method with sandbag bed course |
-
2020
- 2020-04-20 CN CN202010312451.4A patent/CN111485546A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070048088A1 (en) * | 2003-05-28 | 2007-03-01 | Baggermaatschappij Boskalis B.V. | Method and assembly for withdrawing or supplying substances from/to a soil body |
| CN201305846Y (en) * | 2008-11-28 | 2009-09-09 | 天津市水利科学研究所 | Double-layer low- order vacuum prepressing reinforcing device |
| CN201538964U (en) * | 2009-11-30 | 2010-08-04 | 曾国海 | Ultra-soft foundation shallow layer stacking and reinforcing system |
| KR20120126480A (en) * | 2011-05-12 | 2012-11-21 | 김용묵 | Environment-friendly horizontal drain apparatus |
| CN103981853A (en) * | 2014-05-21 | 2014-08-13 | 浙江大学城市学院 | Vacuum preloading device and soil molding process of remolding soil |
| CN109653188A (en) * | 2019-01-10 | 2019-04-19 | 天津城建大学 | A kind of vacuum prepressing device and its construction method with sandbag bed course |
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