CN102828499A - Improved quick high vacuum densification soft foundation treatment method - Google Patents
Improved quick high vacuum densification soft foundation treatment method Download PDFInfo
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- CN102828499A CN102828499A CN2012101374775A CN201210137477A CN102828499A CN 102828499 A CN102828499 A CN 102828499A CN 2012101374775 A CN2012101374775 A CN 2012101374775A CN 201210137477 A CN201210137477 A CN 201210137477A CN 102828499 A CN102828499 A CN 102828499A
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- subgrade
- soft foundation
- horizontal lying
- plastic draining
- lying pipe
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Abstract
The invention discloses an improved quick high vacuum densification soft foundation treatment method, belonging to the technical field of geotechnical engineering. The method comprises the following steps of: 1, inserting a plurality of groups of plastic draining plates wrapped with geotextile into a soft foundation to be treated, connecting the upper ends of the plastic draining plates to level horizontal pipes, and then connecting the horizontal pipes to vacuum pumping equipment, and embedding the level horizontal pipes into the surface soil of the soft foundation to be treated; and 2, starting the vacuum pumping equipment, and carrying out high-energy dynamic consolation in each direction of the surface layer of the soft foundation at a plurality of times, so as to keep the soft soil in a high vacuum state which is also a high pressure differential state together with the vacuum pumping construction. The method has low cost, short construction period, controllable quality and pure physical construction and is environment friendly and is capable of quickly consolidating the soft foundation.
Description
Technical field
The present invention relates to a kind of processing method of geotechnical engineering technical field, specifically, relate to the quick 'high vacuum densification ' soft foundation treatment method of a kind of modified.
Background technology
Along with the minimizing that utilizes the soil and the enhancing of people's environmental protection consciousness can be supported in the city; People are in coastal, river, along the river the epeirogenetic engineering is increasing in recent years, and the common water content of the land-based area soil body, the compressibilty that has just formed is very high, permeability is very poor, belongs to weak soil; Must could satisfy instructions for use through handling; Just land resources is in short supply at present, and this type engineering also can roll up in the future, thereby the subgrade processing has wide application prospect.
There is a large amount of subgrades in area riverine, coastal and along the lake, and the general water content of subgrade is high, poor permeability, and bearing capacity is low, and man-machine being difficult to gets into, and without foundation improvement, can't carry out construction such as road, factory building.The top-out construction can be carried out so subgrade must pass through foundation improvement, otherwise adverse consequences such as building settlement, crack and fracture can be brought.
" high-vacuum densification " method (CN 1330189A) is the new works during subgrade is handled in recent years, and this method is that the well-points dewatering of employing high vacuum adds vibroroller cmpacting or dynamic compaction method reduces the water content of handling the soil body, to improve the compactness of the soil body.The high vacuum well-points dewatering is that skewer is gone into several vacuum pumping pipes on the subgrade that needs are handled; Each vacuum tube connection well point device header; Equipment total header in well point connects a homeostasis tube, and the homeostasis tube links to each other with drainage pump with vacuum pump respectively, and vacuum is drawn water; Vibroroller cmpacting or strong the rammer are promptly adopted: when need are handled the soil body and reached certain water content, adopt and hit the equipment of shaking and hit the real soil body that needs to handle and reach certain compactness.
At present; The High vacuum compacting method existing problems: the first, vacuum tube is inserted in the subgrade surface, because the needs of tracked machine walking width, the spacing of arranging of vacuum tube is restricted; So the quantity of comb is restricted, influenced the effect that High vacuum compacting method is implemented.The second, owing to need extract/insert vacuum tube repeatedly, when extracting/inserting the vacuum tube operation, hammer ram carries out " fitting energy forced ramming " to subgrade will interrupt, and " ultravacuum " environment that forms in the subgrade before each tube drawing is destroyed.Three, vacuum tube is an absolute construction, and the volume of the drainage channel that it constituted is big not enough.
Summary of the invention
The object of the present invention is to provide the quick 'high vacuum densification ' soft foundation treatment method of a kind of modified, provide to reach that a kind of cost is low, the duration short, the technical purpose of the method for the quick solidification soft foundation of quality controllable and pure physics construction environmental protection.
The object of the present invention is to provide the quick 'high vacuum densification ' soft foundation treatment method of a kind of modified, this method may further comprise the steps:
In the subgrade that the first step, the plastic draining board insertions that some groups of use geotextiles are wrapped up need to handle, the plastic draining board upper end is connected to horizontal lying pipe, and said horizontal lying pipe is connected to vaccum-pumping equipment again;
Second step, startup vaccum-pumping equipment carry out continual vacuumizing and dynamic consolidation construction in each orientation of surface layer of soft foundation.
Said horizontal lying pipe adopts anti-impact to press material, and this anti-impact presses the intensity of material to satisfy: when carrying out dynamic consolidation construction, this horizontal lying pipe is not damaged.
The said tamping force that carries out dynamic consolidation construction is smaller or equal to 10000KNM.
Said horizontal lying pipe is embedded in the topsoil that is processed subgrade.
The connecting interface of said horizontal lying pipe and plastic draining board is for being tightly connected.
Said plastic draining board is with rectangular or quincunx distribution, and its spacing is 0.3～5 meter.
Said several change energy range all over the change energy forced ramming is 500KNM～10000KNM, rams number of times by force and rams 1～15 time for strong.
The scope of vacuumizing of said vaccum-pumping equipment is 200m
2～1200m
2/ platform, the vacuum pressure difference of said pumping high vacuum is 50-150kpa.
The transmission coefficient value of said subgrade is 10
-4～10
-9Cm/s.
Compared with prior art, the present invention has following advantage:
1) the horizontal lying pipe that is connected with vaccum-pumping equipment among the present invention is embedded in the surface layer of soft foundation; Make the subgrade surface not limit the bar of tracked machine walking; Make tracked machine can go to the arbitrary orientation on subgrade surface, make hammer ram ram construction at the arbitrary orientation of subgrade.
2) adopt soft soil foundation treatment of the present invention owing to need not to extract repeatedly/insert vacuum tube; Make hammer ram carry out " fitting energy forced ramming " to subgrade continuously; The control pore water pressure raises and is " normal pressure "; " negative pressure " of being somebody's turn to do the formation of " normal pressure " and vaccum-pumping equipment is superimposed, makes relative " ultravacuum " environment of moisture formation in the subgrade.Under " ultravacuum " environment, the vacuum pumping equipment vacuumizes, and can make the pore water pressure dissipation in the subgrade, and the water in the subgrade can more easily be discharged.
3) the present invention adopts anti-impact to press the horizontal lying pipe of material to connect vaccum-pumping equipment; Hammer ram tamping force causes downforce to the subgrade soil layer; This downforce is delivered to said horizontal lying pipe; This horizontal lying pipe can be resisted the interior hammer ram of certain limit and ram the active force that is delivered to said horizontal lying pipe, and this horizontal lying pipe is not damaged, thereby in work progress, keeps negative pressure.
4) drainage channel of the present invention adopts plastic draining board, and compared to vacuum tube, plastic draining board is the higher drainage channel of density of texture, and this plastic draining board drainage efficiency is higher.
Description of drawings
Fig. 1 is a sketch map of the present invention.
The specific embodiment
Below in conjunction with specific embodiment, the present invention is further specified.Should be understood that following examples only are used to the present invention is described but not are used to limit scope of the present invention.
Flexible foundation treatment method of the present invention; Horizontal lying pipe is embedded in the topsoil that is processed the soil body; Avoided the operation that close equipment is hit in influence that is provided with of construction area vacuum tube, and can select suitable spacing, and needn't consider the size of construction equipment according to the influence basin of plastic draining board; Simultaneously, promoted the compressive strength of horizontal lying pipe, it can be damaged when hitting close equipment construction and influence the effect that vacuumizes.Like this, in the practice of construction process, can carry out continual vacuumizing simultaneously and ram, not only shorten the engineering time, save cost, and guaranteed construction quality with strong.
For employed horizontal lying pipe among the present invention, those skilled in the art can select suitable material according to the needs of reality, makes it meet the resistance to compression demand.
Embodiment 1
As shown in Figure 1, certain storage yard engineering, soil layer situation are mucky soil, thick about 10 ~ 12 meters, and water content 65%, transmission coefficient 10
-4Cm/s.
Designing requirement: the bearing capacity of subgrade 16 reaches 100KPa in 12 meters.
Specific embodiments is following:
The first step, the plastic draining boards 11 that some groups of uses of insertion geotextiles are wrapped up in subgrade 16, wherein, said plastic draining board 11 distributes with rectangular; The spacing of the plastic draining board 11 that inserts is 0.3 ~ 2 meter; The upper end of plastic draining board 11 is with lid 12 sealings, and said lid 12 is provided with interface, and this interface is connected with an end of conduit 14; The other end of conduit 14 is connected to vaccum-pumping equipment 13 with corresponding horizontal lying pipe 15, and said horizontal lying pipe 15 is arranged in the top layer of subgrade 16;
Wherein, vaccum-pumping equipment 13 vacuumizes being set to of scope: per 200 ~ 800m
2Subgrade is installed one;
The interface that conduit 14 is connected with the lid 12 of plastic draining board 11 upper ends uses clay 17 to cover 0.3 ~ 1m, and is closely knit to covering, air tight to guarantee during whole construction, to vacuumize;
Second goes on foot, vacuumizes; And carry out uninterrupted several in each orientation on subgrade 16 top layers all over becoming the construction that the energy forced ramming combination vacuumizes; Hammer ram tamping force causes downforce to subgrade 16 soil layers, and this downforce is delivered to said horizontal lying pipe 15, and said horizontal lying pipe 15 is not damaged;
Vacuumize, and implement continual multipass change energy forced ramming in each orientation on subgrade 16 top layers, every all over after strong the rammer; Carry out on-the-spot test; And according to testing result, ram and ram can value all over strong to determine whether to carry out next, wherein; The vacuum degree control that vacuumizes is 50 ~ 80kpa, and each orientation becomes the energy multipass and rams operation by force as follows:
First pass rams can get 500KNM, rams number of times 1 time;
Second time rammer can be got 1500KNM, rams number of times 5 times;
The 3rd time rammer can be got 2500KNM, rams number of times 8 times;
The 4th time rammer can be got 5000KNM, rams number of times 3 times;
Through on-the-spot test, each orientation carry out hitting for the 4th time close after, technical indicator reaches designing requirement.
Behind the worker, detect, the bearing capacity of foundation soil after consolidation process reaches designing requirement.
Through computational analysis, compare with form of construction work commonly used both at home and abroad at present, adopt said method to construct, the cost of saving is 80 yuan/m
2, and the construction period can shorten more than 60%, and operate light safety.
Embodiment 2
As shown in Figure 1, the geological condition in certain development zone, seashore does, the soil layer situation is a mucky soil, thick about 10 ~ 15 meters, and water content 70%, transmission coefficient 1.5 * 10
-6Cm/s.
Designing requirement: the bearing capacity of subgrade 16 reaches 120KPa in 15 meters.
Specific embodiments is following:
The first step, the plastic draining boards 11 that some groups of uses of insertion geotextiles are wrapped up in subgrade 16, wherein, said plastic draining board 11 distributes with rectangular; The spacing of the plastic draining board 11 that inserts is 2 ~ 4 meters; The upper end of plastic draining board 11 is with lid 12 sealings, and said lid 12 is provided with interface, and this interface is connected with an end of conduit 14; The other end of conduit 14 is connected to vaccum-pumping equipment 13 with corresponding horizontal lying pipe 15, and said horizontal lying pipe 15 is arranged in the top layer of subgrade 16;
Wherein, vaccum-pumping equipment 13 vacuumizes being set to of scope: per 400 ~ 1000m
2Subgrade is installed one;
The interface that conduit 14 is connected with the lid 12 of plastic draining board 11 upper ends uses clay 17 to cover 0.8 ~ 1.2m, and is closely knit to covering, air tight to guarantee during whole construction, to vacuumize;
Second goes on foot, vacuumizes; And carry out continual several in each orientation on subgrade 16 top layers all over becoming the construction that the energy forced ramming combination vacuumizes; Hammer ram tamping force causes downforce to subgrade 16 soil layers, and this downforce is delivered to said horizontal lying pipe 15, and said horizontal lying pipe 15 is not damaged;
Vacuumize, and implement continual multipass change energy forced ramming in each orientation on subgrade 16 top layers, every all over after strong the rammer; Carry out on-the-spot test; And according to testing result, ram and ram can value all over strong to determine whether to carry out next, wherein; The vacuum degree control that vacuumizes is 60 ~ 100kpa, and each orientation becomes the energy multipass and rams operation by force as follows:
First pass rams can get 4000KNM, rams number of times 3 times;
Second time rammer can be got 4500KNM, rams number of times 12 times;
The 3rd time rammer can be got 6500KNM, rams number of times 6 times;
The 4th time rammer can be got 8000KNM, rams number of times 5 times;
Through on-the-spot test, each orientation carry out hitting for the 4th time close after, technical indicator reaches designing requirement.
Behind the worker, detect, the bearing capacity of foundation soil after consolidation process reaches designing requirement.
Through computational analysis, compare with form of construction work commonly used both at home and abroad at present, adopt said method to construct, the cost of saving is 70 yuan/m
2, and the construction period can shorten more than 60%, and operate light safety.
Embodiment 3
As shown in Figure 1, certain riverine subgrade 16, the soil layer situation is a mucky soil, thick about 12 ~ 18 meters, water content is about 75%, transmission coefficient 10
-9Cm/s.
Designing requirement: the bearing capacity of subgrade 16 reaches 140KPa in 18 meters.
Specific embodiments is following:
The first step, in subgrade 16, insert the some groups of plastic draining boards 11 that use the geotextiles parcel fully, wherein, said plastic draining board 11 is with quincunx distribution; The spacing of the plastic draining board 11 that inserts is 3 ~ 5 meters; The upper end of plastic draining board 11 is with lid 12 sealings, and said lid 12 is provided with interface, and this interface is connected with an end of conduit 14; The other end of conduit 14 is connected to vaccum-pumping equipment 13 with corresponding horizontal lying pipe 15, and said horizontal lying pipe 15 is arranged in the top layer of subgrade 16;
Wherein, vaccum-pumping equipment 13 vacuumizes being set to of scope: per 600 ~ 1200m
2Subgrade 16 is installed one;
The interface that conduit 14 is connected with the lid 12 of plastic draining board 11 upper ends uses clay 17 to cover 1 ~ 1.5m, and is closely knit to covering, air tight to guarantee during whole construction, to vacuumize;
Second goes on foot, vacuumizes; And carry out continual several in each orientation on subgrade 16 top layers all over becoming the construction that the energy forced ramming combination vacuumizes; Hammer ram tamping force causes downforce to subgrade 16 soil layers, and this downforce is delivered to said horizontal lying pipe 15, and said horizontal lying pipe 15 is not damaged;
Vacuumize, and implement continual multipass change energy forced ramming in each orientation on subgrade 16 top layers, every all over after strong the rammer; Carry out on-the-spot test; And according to testing result, ram and ram can value all over strong to determine whether to carry out next, wherein; The vacuum degree control that vacuumizes is 90 ~ 150kpa, and each orientation becomes the energy multipass and rams operation by force as follows:
First pass rams can get 3000KNM, rams number of times 10 times;
Second time rammer can be got 3500KNM, rams number of times 15 times;
The 3rd time rammer can be got 4500KNM, rams number of times 8 times;
The 4th time rammer can be got 6000KNM, rams number of times 6 times;
The 5th time rammer can be got 8000KNM, rams number of times 6 times;
The 6th time rammer can be got 10000KNM, rams number of times 4 times;
Through on-the-spot test, each orientation carry out hitting for the 6th time close after, technical indicator reaches designing requirement.
After processing, detect, subgrade 16 bearing capacities after consolidation process reach designing requirement.
Through computational analysis, compare with form of construction work commonly used both at home and abroad at present, adopt said method to construct, the cost of saving is 150 yuan/m
2, and the construction period can shorten more than 60%, and operate light safety.
Claims (9)
1. quick 'high vacuum densification ' soft foundation treatment method of modified is characterized in that this method may further comprise the steps:
In the subgrade that the first step, the plastic draining board insertions that some groups of use geotextiles are wrapped up need to handle, the plastic draining board upper end is connected to horizontal lying pipe, and said horizontal lying pipe is connected to vaccum-pumping equipment again;
Second step, startup vaccum-pumping equipment carry out continual vacuumizing and dynamic consolidation construction in each orientation of surface layer of soft foundation.
2. method according to claim 1 is characterized in that, said horizontal lying pipe adopts anti-impact to press material, and this anti-impact presses the intensity of material to satisfy: when carrying out dynamic consolidation construction, this horizontal lying pipe is not damaged.
3. method according to claim 2 is characterized in that, the said tamping force that carries out dynamic consolidation construction is smaller or equal to 10000KNM.
4. method according to claim 1 is characterized in that, said horizontal lying pipe is embedded in the topsoil that is processed subgrade.
5. method according to claim 1 is characterized in that, the connecting interface of said horizontal lying pipe and plastic draining board is for being tightly connected.
6. method according to claim 1 is characterized in that, said plastic draining board is with rectangular or quincunx distribution, and its spacing is 0.3 ~ 5 meter.
7. method according to claim 1 is characterized in that, said several change energy ranges all over the change energy forced ramming are 500KNM ~ 10000KNM, ram number of times by force and ram 1 ~ 15 time for strong.
8. method according to claim 1 is characterized in that, the scope of vacuumizing of said vaccum-pumping equipment is 200m
2~ 1200m
2/ platform, the vacuum pressure difference of said pumping high vacuum is 50-150kpa.
9. method according to claim 1 is characterized in that, the transmission coefficient value of said subgrade is 10
-4~ 10
-9Cm/s.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104929102A (en) * | 2015-04-23 | 2015-09-23 | 上海交通大学 | Silt rheology vacuum vibration combined dewatering system and method |
| CN106869107A (en) * | 2017-02-28 | 2017-06-20 | 河北工业大学 | The novel solid drainage system and its dewatering construction method of a kind of reinforcing soft ground |
| CN106958239A (en) * | 2016-01-11 | 2017-07-18 | 上海杰欧地基建筑科技有限公司 | Precipitation union gently rams soft soil foundation reinforcing method |
| CN111809603A (en) * | 2019-04-10 | 2020-10-23 | 上海港湾基础建设（集团）股份有限公司 | High-vacuum densification soft foundation treatment method |
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| CN101041961A (en) * | 2007-04-16 | 2007-09-26 | 李�杰 | Vacuum infiltration adsorption reinforcing method for soft soil foundation |
| CN201362845Y (en) * | 2008-10-30 | 2009-12-16 | 曾国海 | Plastic draining board and composite negative pressure well point pipe concreting system for soft soil foundation |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104929102A (en) * | 2015-04-23 | 2015-09-23 | 上海交通大学 | Silt rheology vacuum vibration combined dewatering system and method |
| CN106958239A (en) * | 2016-01-11 | 2017-07-18 | 上海杰欧地基建筑科技有限公司 | Precipitation union gently rams soft soil foundation reinforcing method |
| CN106869107A (en) * | 2017-02-28 | 2017-06-20 | 河北工业大学 | The novel solid drainage system and its dewatering construction method of a kind of reinforcing soft ground |
| CN111809603A (en) * | 2019-04-10 | 2020-10-23 | 上海港湾基础建设（集团）股份有限公司 | High-vacuum densification soft foundation treatment method |
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Application publication date: 20121219 |
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