CN108824113B - Soft soil foundation treatment method - Google Patents
Soft soil foundation treatment method Download PDFInfo
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- CN108824113B CN108824113B CN201810806661.1A CN201810806661A CN108824113B CN 108824113 B CN108824113 B CN 108824113B CN 201810806661 A CN201810806661 A CN 201810806661A CN 108824113 B CN108824113 B CN 108824113B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
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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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- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (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 treatment method, which comprises the following steps: treating the surface layer of the foundation; inserting a vertical drainage pipeline and a vacuum exhaust pipeline, and installing a drainage pipe and a vacuum pump; covering a sealing film, vacuumizing and draining; removing the sealing film and the vacuum pump, and grouting into the vertical drainage pipeline; and filling quicklime into a cavity left by the vertical drainage pipeline after the grouting liquid is condensed, and finally backfilling and capping by adopting dry soil. According to the invention, through the arrangement, the water is analyzed by adopting the vertical drainage pipeline under the vacuum environment, the middle-layer moisture of the soft soil foundation can be basically and completely removed, and then grouting treatment is carried out on the base part of the soft soil foundation, so that on one hand, the deep foundation is reinforced, on the other hand, the upward permeation path of the moisture is blocked, the adverse effect of the moisture on the roadbed is reduced, meanwhile, quicklime is buried in the shallow layer of the soft soil foundation, the moisture in the shallow layer can also be fully absorbed, and the moisture in the whole soft soil foundation soil body can be completely removed.
Description
Technical Field
The invention relates to the technical field of road construction, in particular to a soft soil foundation treatment method.
Background
The treatment of the roadbed is an extremely important part in the road construction, the influence on the quality of the whole road is important, and the influence of the roadbed on the roads in the early construction stage is not completely emphasized, so that various engineering accidents such as breakage, expansion, collapse and the like occur on the finished roads in the later stage, and the quality of the whole road engineering is seriously influenced.
As is well known, the roadbed is a stressed bearing body of a road and needs to bear static load, dynamic load and various shear stresses on the road, so that the strength and stability of the roadbed itself are extremely important. In order to ensure the strength and stability of the roadbed, except for selecting qualified roadbed fillers and constructing according to the standard, the treatment of the soft soil foundation is an important factor which cannot be ignored, and the factors influencing the self strength of the soft soil roadbed in the construction process at present are not only the difference on the treatment of the roadbed, but also more important influencing factors which are the erosion action of moisture on the roadbed.
Chinese patent application publication No. CN104264559A discloses a vacuum preloading roadbed processing device and a construction method thereof, the device comprises a horizontal drainage body, a vertical drainage body arranged in a soft foundation, and a vacuum pressurization system, wherein the vertical drainage body comprises a plastic drainage plate, and a sealing material is laid on a partial area of the plastic drainage plate to seal the drainage plate. The vertical drainage plate enables water to be discharged out of the soil body from bottom to top, so that the strength of the roadbed is enhanced, and the erosion effect of the water on the roadbed is reduced.
However, as described in the above-mentioned solution, when the plastic drainage plate drains water in the vertical direction, a well-block effect is inevitably accompanied, that is, the more the drainage function of the plastic drainage plate at the deeper position is reduced, the more the depth of soft soil foundation treatment of the roadbed is limited, the larger settlement after construction and the longer secondary consolidation time are, which are not favorable for stabilizing the roadbed. Therefore, technical solutions more favorable for reducing the erosion effect of moisture on the roadbed are needed.
Disclosure of Invention
The invention aims to provide a soft soil foundation treatment method, which has the effect of more completely removing the whole moisture of a soil body of a soft soil foundation and is beneficial to reducing the erosion effect of the moisture on a roadbed.
The technical purpose of the invention is realized by the following technical scheme, and the soft soil foundation treatment method comprises the following steps:
s1, treating the surface layer of the foundation, and removing impurities on the surface layer of the foundation;
s2, inserting a vertical drainage pipeline and a vacuum exhaust pipeline, and installing a drainage pipe and a vacuum pump;
s3, covering a sealing film, continuously performing vacuum-pumping treatment and timely draining water;
s4, removing the sealing film and the vacuum pump after no obvious moisture seeps from the upper surface of the surface layer of the foundation,
s5, grouting into the vertical drainage pipeline;
and S6, after grouting to elevation, standing until grouting liquid is permeated and condensed, filling quicklime into the vertical drainage pipeline, and finally backfilling and capping by adopting dry soil.
Through adopting above-mentioned technical scheme, adopt vertical drainage pipe to go out at vacuum environment precipitation analysis down, can get rid of the middle level moisture of soft soil foundation completely basically, the rethread is handled to the grout of soft soil foundation base portion, on the one hand strengthen the processing to the foundation of deep layer, on the other hand has hindered the ascending infiltration route of moisture, reduce the harmful effects of moisture to the road bed, quick lime has been buried underground in the shallow layer department of soft soil foundation simultaneously, also can fully absorb the moisture of shallow layer, make the holistic moisture of foundation top layer soil body get rid of comparatively completely.
The invention is further provided with: the bottom of the vertical drainage pipeline is sealed and arranged and comprises an inner pipe and an outer sleeve layer, the inner pipe is composed of multiple layers of superposed core plates, multiple channels are formed between every two adjacent core plates, and the outer wall of the inner pipe is sleeved with the outer sleeve layer.
The invention is further provided with: the outer jacket layer comprises friction layer and filter layer, the friction layer is hard material and has seted up a plurality ofly the hole of permeating water, friction layer fixed connection in the bottom of vertical drain pipe, just the friction layer with form between the inner tube and be used for placing the intermediate layer of filter layer, the filter layer adopts the water permeability geotextile.
Through adopting above-mentioned technical scheme, after squeezing into vertical drainage pipe in the soft soil foundation soil body, vertical drainage pipe can form vertical rivers passageway one through the extrusion, vertical drainage pipe includes the frictional layer simultaneously, filter layer and inner tube total three-layer, the filter layer presss from both sides and establishes in the intermediate layer, act as the filter media of moisture infiltration to the inner tube in drainage process, prevent that impurity such as earth from blockking up the hole that permeates water of inner tube, when later stage slip casting, extract the filter layer again, the thick liquid can directly permeate to inside the soil body through the hole of permeating water this moment, accomplish the effect of embedment.
The invention is further provided with: after the installation of the vertical drainage pipeline is completed in S2, a permeable sand layer is laid on the upper surface of the surface layer of the foundation, the vacuum exhaust pipeline comprises a horizontal pipe and a vertical pipe which are communicated, the horizontal pipe is buried in the permeable sand layer, the vertical pipe is buried in the soft soil foundation soil body, and the vacuum pump is connected to the horizontal pipe.
Through adopting above-mentioned technical scheme, the setting up of infiltration sand bed can make the moisture that comes on the dialysis discharge smoothly, buries the horizontal pipe underground in the infiltration sand bed and is favorable to carrying out the evacuation processing to the infiltration sand bed.
The invention is further provided with: the sealing membrane that covers in S3 is the multilayer of laying in proper order, dig all around of soft soil foundation and be equipped with sealed ditch, four edges of sealing membrane bury underground in sealed ditch.
Through adopting above-mentioned technical scheme, four edges of seal membrane all bury in sealed ditch to take certain sealing measure such as water seal etc. make the seal membrane cover the environment that forms a five sealed with the ground top layer, be favorable to the formation and the maintenance of cavity environment.
The invention is further provided with: when the grouting operation of the vertical drainage pipeline in the S5 is carried out, the filter layer is firstly drawn out from the interlayer; the water permeable holes are all arranged in an upward inclined mode along the length direction of the vertical drainage pipeline.
Through adopting above-mentioned technical scheme, the hole of permeating water sets up along vertical drainage pipe's length direction tilt up to can not block up because of earth will permeate water the hole when squeezing into vertical drainage pipe in to soft soil foundation soil body.
The invention is further provided with: and when quicklime is filled into the vertical drainage pipeline in the S6, the amount of the filled quicklime is 1/4-1/3 of the height of the vertical drainage pipeline.
By adopting the technical scheme, the quick lime has a good effect of absorbing moisture, moisture can be retained in a shallow soil body for a long time after a soft soil foundation soil body is separated out, delay in a short working period is often caused for construction, if the soil is buried too little, the effect of absorbing the moisture of the shallow soil body as soon as possible is not achieved, the soil is buried too much, and the stability of long-term use after the pavement is finished is not facilitated.
The invention is further provided with: and S3, when the vacuum pumping is performed, continuously performing the vacuum pumping after the vacuum pump is connected to the horizontal pipe, wherein the processing time is 30-45 days, and when the last 10-15 days of the processing time, the other end of the horizontal pipe is connected with an air inlet pump which pumps hot air.
By adopting the technical scheme, the vacuumized treatment time is determined according to the actual working condition of a construction site, a common treatment period is 30-45 days, hot air is introduced in 1/3 time after the treatment time, and heat can be brought into soil bodies of various depths of a soft soil foundation after the air suction treatment of the vacuum pump, so that the effect of drying water as soon as possible is achieved, the heat-insulated vacuum-type vacuum-pumping device is complementary with a vertical drainage pipeline, the defect of low water analysis rate of the vertical drainage pipeline in the later construction stage is overcome, the drying treatment cannot depend on the development of cracks or joints inside a soil layer, the effect is good, and the coverage is wide.
The invention is further provided with: after the air inlet pump is started, the vacuum pump increases the evacuation flow rate, and the hollowness in the soft soil foundation is maintained to be not smaller than that before the air inlet pump is started.
By adopting the technical scheme, in order to ensure the drying treatment effect, certain air inflow must be ensured, and meanwhile, the vacuum degree is required to be kept constant or even larger, and then the flow of the vacuum pump must be increased.
In conclusion, the invention has the following beneficial effects: 1) the method of matching the vacuum method with the vertical drainage pipeline is beneficial to completely removing the water in the middle layer of the soft soil foundation; 2) the soft soil foundation after the water drainage is filled and sealed, so that on one hand, a path for further upward permeation of water in the soft soil foundation soil body is prevented, and on the other hand, the effect of strengthening the strength of the soft soil foundation soil body is achieved; 3) the quick lime is embedded in the shallow soil body, so that the absorption speed of the moisture in the shallow soil body can be increased, and the effect of absorbing the moisture in the shallow soil body can be achieved in the long-term use of a later road.
Drawings
FIG. 1 is a schematic structural view of a vertical drain pipe according to the present embodiment;
FIG. 2 is a schematic cross-sectional view of a vertical drain pipe;
fig. 3 is a schematic cross-sectional view of two core plates in the inner tube.
In the figure: 1. a vertical drainage pipeline; 2. a friction layer; 3. a filter layer; 4. an inner tube; 5. water permeable holes; 6. a core board; 7. a water-permeable channel.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The specific embodiments are only for explaining the present invention, and the present invention is not limited thereto, and those skilled in the art can make modifications without inventive contribution to the present embodiments as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
The embodiment provides a soft soil foundation treatment method, which comprises the following steps:
and S1, treating the surface layer of the foundation and removing impurities on the surface layer of the foundation. For the foundation surface layer of the construction road section, the foundation surface layer is leveled, surface garbage is timely cleaned, local sludge is excavated and replaced, and a drainage well is preset at the periphery of the foundation surface layer to be treated.
S2, driving the prefabricated vertical drainage pipeline 1 into a soft soil foundation soil body by a machine, driving the vertical pipes in the vacuum exhaust pipeline into the soft soil foundation soil body, installing the horizontal pipes of the vacuum exhaust pipeline, communicating all the vertical pipes with the horizontal pipes through the horizontal pipes, and laying a permeable sand layer on the upper surface of the foundation surface layer after the horizontal pipes and the vertical pipes are installed, wherein the thickness is generally 500 plus 800 mm.
As shown in fig. 1 and 2, vertical drainage pipe 1 includes inner tube 4, filter layer 3 and frictional layer 2 constitute, vertical drainage pipe 1's bottom is the toper setting, conveniently squeeze into in the soft soil foundation soil body, frictional layer 2 adopts the stainless steel preparation and welds on the bottom, a plurality of holes 5 of permeating water have been seted up on frictional layer 2, the hole 5 of permeating water sets up along vertical drainage pipe 1's length direction tilt up, make when beating vertical drainage pipe 1 into the soil body downwards, can not let earth will permeate water hole 5 and block up.
As shown in fig. 2 and 3, the bottom of the inner pipe 4 is also fixedly connected to the bottom end of the vertical drainage pipeline 1, the inner pipe 4 is composed of a plurality of layers of mutually overlapped plastic core plates 6, the cross sections of the plastic core plates 6 are in a cross parallel connection shape, and a plurality of water permeable channels 7 with upward separated water are formed between the adjacent plastic core plates 6.
As shown in fig. 1 and 2, an interlayer is further left between the friction layer 2 and the inner pipe 4, a filter layer 3 is connected in the interlayer in a sliding manner, and the filter layer 3 is a soft permeable geotextile, so that water dialyzed into the vertical drainage pipeline 1 can be effectively filtered, and the pollution of impurities to the inner pipe 4 is reduced.
The vertical drainage pipeline 1, the vertical pipe and the horizontal pipe are all covered by the permeable sand layer, and at the moment, two ends of the horizontal pipe are respectively connected with one sealing valve connecting end for later use.
S3, starting to cover the sealing film. And covering a plurality of layers of sealing films onto the permeable sand layer by layer, wherein the sealing valve connecting end at one end of the horizontal pipe penetrates out of the sealing films and is connected with a vacuum pump. Digging a sealing ditch along the peripheral outer edge of the soft soil foundation to be treated, wherein the depth of the sealing ditch is 2-3m, the film edges of the sealing film vertically enter the ditch body along the inner wall of the sealing ditch and are paved on the ditch bottom of the sealing ditch, the sealing ditch with the sealing film paved on the ditch bottom is backfilled to the 1/2-high position of the ditch body by clay or silt, and then carrying out water covering treatment until the sealing ditch is filled to form a water sealing belt communicated with the periphery, so that the sealing film can seal the soft soil foundation to be treated as much as possible.
After sealing is completed, the vacuum pump is started to vacuumize the soft soil foundation part to be treated, and in order to grasp the air pressure condition in the soft soil foundation soil body in real time, an air pressure sensor needs to be embedded in the soft soil foundation soil bodies at different depths before the sealing layer is laid. After the vacuum pumping is carried out for a period of time, moisture begins to be separated out in the permeable sand layer, and a water pump placed in the sealing film can be started timely to pump the moisture out in time.
The vacuumizing treatment lasts for 30-45 days generally, the specific duration is determined according to the field water quality and the settlement amount of the soft soil foundation soil body, in the last 10-15 days of vacuumizing, the connecting end of the sealing valve at the other end of the horizontal pipe is connected with an air inlet pump, the air inlet pump pumps hot air into the horizontal pipe, and at the moment, the flow of the vacuum pump is synchronously increased, so that the vacuum degree in the sealing film is not less than the vacuum degree before the air inlet pump is started.
And S4, removing the sealing film, the vacuum exhaust pipeline, the drain pipe, the air inlet pump and the vacuum pump when no obvious moisture seeps from the surface layer of the foundation, and then pumping the filter layer 3 in the vertical drain pipeline 1 upwards.
S5, after the filter layer 3 is drawn out, grouting the pre-stirred grouting liquid into the vertical drainage pipeline 1 through a grouting device, wherein the grouting speed should be kept slow, and the liquid level of the grouting liquid is kept at 1/3 of the vertical drainage pipeline 1.
S6, standing overnight after grouting is finished, filling dry quicklime into the vertical drainage pipeline 1 after grouting liquid is condensed, wherein the amount of the filled quicklime is 1/4-1/3 of the height of the vertical drainage pipeline 1, and after quicklime filling is finished, sealing the rest vertical drainage pipeline 1 by adopting a dry soil body to finish soft soil foundation treatment.
Claims (7)
1. A soft soil foundation treatment method is characterized by comprising the following steps:
s1, treating the surface layer of the foundation, and removing impurities on the surface layer of the foundation;
s2, inserting a vertical drainage pipeline (1) and a vacuum exhaust pipeline, and installing a drainage pipe and a vacuum pump;
s3, covering a sealing film, continuously performing vacuum-pumping treatment and timely draining water;
s4, removing the sealing film and the vacuum pump after no obvious moisture seeps from the upper surface of the surface layer of the foundation,
s5, grouting into the vertical drainage pipeline (1);
s6, after grouting to elevation, standing until grouting liquid is permeated and condensed, filling quicklime into the vertical drainage pipeline (1), and finally backfilling with dry soil for capping; the sealing films covered in the S3 are sequentially laid in multiple layers, sealing ditches are dug in the periphery of the soft soil foundation, and four edges of the sealing films are embedded in the sealing ditches; when the vacuum pumping treatment is carried out in the S3, the vacuum pump is connected to the horizontal pipe and then continuously carries out the vacuum pumping treatment, the treatment time is 30-45 days, and when the last 10-15 days of the treatment time, the other end of the horizontal pipe is connected with an air inlet pump which pumps hot air;
vertical drainage pipe (1) bottom is sealed to be set up and includes inner tube (4) and outer jacket layer, the outer wall of inner tube (4) is located to the outer jacket layer cover, outer jacket layer comprises frictional layer (2) and filter layer (3), just frictional layer (2) with form between inner tube (4) and be used for placing the intermediate layer of filter layer (3), when operating vertical drainage pipe (1) grout in S5, take filter layer (3) out from the intermediate layer earlier.
2. A soft soil foundation treatment method according to claim 1, characterized in that: the inner pipe (4) is composed of a plurality of layers of superposed core plates (6), and a plurality of water permeable channels (7) are formed between the adjacent core plates (6).
3. A soft soil foundation treatment method according to claim 2, characterized in that: frictional layer (2) are hard material and make and seted up a plurality of holes (5) of permeating water, frictional layer (2) fixed connection in the bottom of vertical drain pipe, filter layer (3) adopt the geotextile of water permeability.
4. A soft soil foundation treatment method according to claim 1, characterized in that: after the installation of the vertical drainage pipeline (1) is completed in S2, a permeable sand layer is laid on the upper surface of the surface layer of the foundation, the vacuum exhaust pipeline comprises a horizontal pipe and a vertical pipe which are communicated, the horizontal pipe is buried in the permeable sand layer, the vertical pipe is buried in the soft soil foundation soil body, and the vacuum pump is connected to the horizontal pipe.
5. A soft soil foundation treatment method according to claim 3, characterised in that: the water permeable holes (5) are all arranged in an upward inclined mode along the length direction of the vertical drainage pipeline (1).
6. A soft soil foundation treatment method according to claim 1, characterized in that: and when quicklime is filled into the vertical drainage pipeline (1) in the S6, the amount of the filled quicklime is 1/4-1/3 of the height of the vertical drainage pipeline (1).
7. A soft soil foundation treatment method according to claim 1, characterized in that: after the air inlet pump is started, the vacuum pump increases the evacuation flow rate, and the hollowness in the soft soil foundation is maintained to be not smaller than that before the air inlet pump is started.
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| CN201810806661.1A CN108824113B (en) | 2018-07-20 | 2018-07-20 | Soft soil foundation treatment method |
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| CN201810806661.1A CN108824113B (en) | 2018-07-20 | 2018-07-20 | Soft soil foundation treatment method |
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| CN111945501B (en) * | 2020-08-20 | 2022-03-08 | 长沙理工大学 | Improved intelligent stone-avoiding device for turning over and drying bad fillers in case of over-wet embankment and use method thereof |
| JP7557779B2 (en) | 2021-02-10 | 2024-09-30 | 岡部株式会社 | Underground drainage device and underground drainage structure |
| CN114808580B (en) * | 2022-05-10 | 2023-12-12 | 安徽厚普建设工程有限公司 | Construction method for anti-sedimentation highway subgrade in soft soil area |
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| CN1294970A (en) * | 1999-11-08 | 2001-05-16 | 江苏浩创基础工程材料有限公司 | Thermally welded plastic drainage board and its manufacture |
| CN102587352B (en) * | 2012-02-24 | 2014-03-26 | 宁波市轨道交通工程建设指挥部 | Hot-water draining consolidation processing device and hot-water draining consolidating processing method for soft soil foundation |
| CN103031835B (en) * | 2012-12-28 | 2014-11-12 | 宁波高新区围海工程技术开发有限公司 | Method for increasing foundation bearing capacity |
| CN105649002A (en) * | 2015-12-29 | 2016-06-08 | 上海强劲地基工程股份有限公司 | Rapid treatment system and rapid treatment method for soft soil foundation |
| CN107604897A (en) * | 2017-09-28 | 2018-01-19 | 无锡厚发自动化设备有限公司 | The reinforcement means that the vacuum preloading of soft soil foundation, air pressure splitting and grouting are combined |
| CN107905210A (en) * | 2017-11-29 | 2018-04-13 | 慈溪市舒润卫浴实业有限公司 | A kind of novel plastic drain bar |
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