CN101148871A - Method for increasing thin-sand-layer-filling soft clay foundation vacuum degree - Google Patents
Method for increasing thin-sand-layer-filling soft clay foundation vacuum degree Download PDFInfo
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- CN101148871A CN101148871A CNA2007100471419A CN200710047141A CN101148871A CN 101148871 A CN101148871 A CN 101148871A CN A2007100471419 A CNA2007100471419 A CN A2007100471419A CN 200710047141 A CN200710047141 A CN 200710047141A CN 101148871 A CN101148871 A CN 101148871A
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Abstract
The present invention relates to building engineering technology, and is especially method of raising the vacuum degree in soft clay foundation with sandwiched sand layer. Probes with pore pressure gauge are mounted to the ends of inserted plate steel pipes to test the pore pressures and determine the clay distribution and property, and sealing plastic sheet is set to the earth work water draining plastic plate in the required height to block air permeating channel. The method can prevent water from leaking to the water draining plastic plate and maintain the vacuum degree in the sand layer. The method is simple, convenient and low in cost.
Description
Technical field
The present invention relates to a kind of method of construction engineering technical field, specifically is a kind of method that improves thin-sand-layer-filling soft clay foundation vacuum degree.
Background technology
After nineteen fifty-two Sweden scientist Jie Erman (Kjellman) proposition uses the method for atmospheric pressure (vacuumizing precompressed) soft foundation to be carried out the discharging consolidation processing, the engineer of many countries has developed various technical schemes at national separately soft foundation condition in the world, has formed the technique of soft soil foundation treatment that characteristics are respectively arranged.After entering the eighties in 20th century, China improves the construction technology of vacuum preloading soft soil foundation, and after this technique of soft soil foundation treatment is developed at home faster; Develop into vacuum combined stack-load, vacuum combined precipitation etc. from single vacuum method.Progressively be applied to the every field such as fast processing of water conservancy, municipal administration, road, bay, dredging silt, obtained huge economic benefit and social benefit.
When squeezing into plastic draining board, need clay distribution and soil nature feature in definite ground, (Estimating coefficient of consolidation from piezocone test, CanadianGeotechnical Journal such as Robertson in 1992,29 (4), 551-557; " the Canadian geotechnical engineering journal " that National Research Council Of Canada sponsors, " achievement of measuring with the static sounding of pore water pressure type is calculated the coefficient of consolidation of soil layer ") measure the regularity of distribution of the pore water pressure in the soil layer by using the hydrostatic static sounding of hole; Then, utilize the regularity of distribution of pore water pressure to determine the fixed proterties and the correlation computations formula (hereinafter to be referred as the Robertson method) of clay distribution and soil layer.And, lost efficacy for preventing vacuum seal, when the sandy soil layer of permeate well is arranged under the argillic horizon, need to determine plastic draining board squeeze in the argillic horizon effective depth or from the minimum range of the layer of sand that crouches down.2006, (Chai, J.-C. such as Chai, Carter J.P.and Hayashi S. (2006): Vacuumconsolidation and its combination with embankment loading, Canadian GeotechnicalJournal, 43 (10), 985-996; " the Canadian geotechnical engineering journal " that National Research Council Of Canada sponsors, " vacuum preconsolidation and with the combined effect of embankment load ") according to the technical requirements of handling and the fixed proterties of soil layer, proposed definite plastic draining board and squeezed into the design formulas of effective depth in the argillic horizon (hereinafter to be referred as the method for Chai etc.).These provide condition for further developing technique of soft soil foundation treatment.
Through existing technical literature retrieval is found, Chinese patent application ZL200410014257, denomination of invention: Fast-track sub-low high vacuum preloading Floor Micronesia hit a soft ground treatment methods, and number of patent application ZL02257905.2, denomination of invention: the band drain that vacuum precompressed soft foundation is reinforced, these patent vacuum preloadings are at first squeezed into plastic draining board in ground; Secondly, on soft foundation, lay sand cushion and netted draining chimney filter composition horizontal channel, cover air-locked diaphragm seal then thereon.Adopt vacuum plant to bleed air in the ground in the film is discharged, make draught head of the inside and outside generation of film, this draught head acts on the ground, and being equivalent to increases a negative pressure load to ground.Constantly be discharged from air in the film and water, draught head increases gradually, and the aqueous vapor in the ground constantly is discharged from and makes the ground generation fixed, makes the intensity of ground obtain increasing.Squeezing into plastic draining board in ground is to discharge from ground in order to accelerate moisture, quickens the drainage effect of soft clay foundation.But one of key of vacuum method reinforcing soft ground technology is the sealing that should keep plastic draining board, horizontal pipeline constantly.There is gas leakage that vacuum is reduced slightly, influences the vacuum preloading effect.But when having the connectivity thin sand in the clay foundation, because the osmotic coefficient ratio cohesive soil of layer of sand is much bigger, press because the gas leakage of layer of sand produces the bigger pressure loss by the vacuum that plastics row plate applies, even inoperative fully in the part, influence the consolidation effect of vacuum preloading.
Summary of the invention
Purpose of the present invention just is to overcome above-mentioned defective, and a kind of method that improves thin-sand-layer-filling soft clay foundation vacuum degree is provided, and makes it can overcome the problem that has the fixed poor effect that causes owing to thin sand.The present invention sticks on fluid-tight plastic sheet at the layer of sand place to plastic draining board outside, water is not bled in the plastic draining board, thereby prevent in the vacuum pressure drop of layer of sand place low.Easy to use, simple to operate, need not large number quipments, and expense does not increase.
The present invention is achieved by the following technical solutions, at first determines clay distribution and character by the ground pore water pressure that each The attracted numbers of pore pressure gauge probe test is installed on the termination of plate sleeve pipe; Pasting the sealed plastic sheet at the absolute altitude place of earthwork plastic drain board thin sand then cuts off gas-permeable channels.
The inventive method may further comprise the steps:
(1) construction equipment setting a: round steel pipe is set in the sleeve pipe side of common plastics band drain board-plugging device, the probe of its end installing hole pressure type static sounding, and cable is set, and the pore water pressure recorder that leads to the face of land in the steel pipe, the pore water pressure that is used to write down the plate process changes.
(2) need are carried out the area dividing leveling of plate, make mid portion slightly high, and put on the position of the plastic draining board that will insert by designing requirement on the face of land.
(3) confirm on-the-spot clay distribution:, insert first plastic draining board carrying out the position that vacuum preconsolidation is reinforced; The pore water pressure of record plate process changes.According to the pore water pressure situation of change, adopt prior art to determine the distributed depth and the thickness on stratum, and determine the coefficient of consolidation and the transmission coefficient of each soil layer, pay special attention to the thickness and the distributed depth of sandy soil layer.
(4) paste the sealed plastic sheet:, paste the sealed plastic sheet at the correspondence position of plastic draining board according to the thickness and the distributed depth of the sandy soil layer of determining in the previous step; Plastic sheet length should be than the thickness of thin sand big 10cm, guarantee layer of sand up and down each 5cm to reach the purpose of sealing layer of sand; The alite paste material should use air-locked resinous material, keeps sealing fully.
(5) plate and record pore water pressure: plastic draining board is being inserted the stratum, limit insert edge record pore water pressure.According to the pore water pressure in the insertion process, judge the thickness of layer of sand and write down its degree of depth.The data of the sand layer thickness in this hole and the degree of depth are pasted the foundation of waterproof plastic sheet position and length as next hole band drain.
(6) if when down there is the layer of sand that need not to handle in argillic horizon, plastic draining board should have a segment distance to guarantee sealing from layer of sand.
(7) repeating step (4) to (6) is finished the plate operation at next position plate until whole zone.
(8) on topsoil, lay a header, the flexible pipe of header and each tape drum plastic draining board is joined; Header is connected with jet vacuum pump;
(9) vacuumize: start vacuum extractor the aqueous vapor in the band drain top box is extracted out, in top box, form negative pressure and be added in the soft foundation.When vacuumizing, open the cone valve in the flexible pipe; During termination of pumping, close cone valve.Keep the vacuum state in the top box.
The present invention can repeat pressurization as required and repeat to vacuumize after step (9) finishes.
Effect of the present invention is: after adopting this partially sealed plastic draining board, can prevent gas leakage effectively, reduce the loss that vacuum is pressed in the precompressed process, vacuum be pressed act on argillic horizon fully, effectively improve the vacuum of whole preconsolidation soft foundation.The equipment aspect only needs additional hole hydraulic type static sounding head on the board-plugging device sleeve pipe, makes comparatively simple.The stickup of sealed plastic sheet can be carried out at the scene on the plastic draining board, and is easy to operate.
Description of drawings
Fig. 1 is the probe schematic diagram that steel pipe and hole pressure type static sounding are installed in embodiment centerboard mantle pipe top.
Fig. 2 is the allocation plan of band drain in soil layer in the embodiment of the invention.
Fig. 3 is the plastic draining board distribution schematic diagram in the embodiment of the invention.
The specific embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated: present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Certain need carry out the ground of vacuum preloading, and detecting the weak argillic horizon gross thickness of affirmation through the scene with hole pressure type static sounding (shown in Figure 1) is 23m, and it is layer of sand down.Its middle and lower part is the initial weak argillic horizon of piling up, and thick is 8m, and soil layer end face absolute altitude is-12.0m; Top is the silt clay layer of piling up in the later stage, thick 13m, and soil layer end face absolute altitude is+3.00m; Therebetween one deck thin sand, thickness is about 2m.Initial water level is positioned at the face of land, and promptly the groundwater table absolute altitude is+3.0m.The coefficient of consolidation of determining each soil layer with the Robertson method is very low.
The vacuum preconsolidation method of a kind of tape drum plastic draining board of field by using is carried out consolidation process to the soil body, and the planar range of reinforcing is 100m * 22m, and through determining that with the method for Chai etc. the length of plastic draining board is about 21 meters, spacing is 1.2m; The structure of tape drum plastic draining board specifies as follows as shown in Figure 2:
(1) construction equipment setting: board-plugging device, the probe of hole pressure type static sounding, pore water pressure recorder.Specifically as shown in Figure 1, in the side of common plastics band drain 1 plate conduit 2 one jiao an internal diameter is set is 11.3 millimeters steel pipe 3; At the head installing hole pressure type static sounding probe 4 of steel pipe, cable 5 picks out on the tester on ground by steel pipe, is used to write down the pore water pressure variation of plate process.
(2) regional smooth good with on-the-spot 100m * 22m makes about the slightly high 0.5m of mid portion, and puts on the position of the plastic draining board that will insert by designing requirement on the face of land.
(3) carrying out the position that vacuum preconsolidation is reinforced, insert first plastic draining board; The pore water pressure of record plate process changes.According to the pore water pressure situation of change, determine the degree of depth of 13 meters of layers of sand with the Robertson method, its thickness is about 2 meters, as shown in Figure 3.
(4) as shown in Figure 2, use the earthwork plastic drain board (but being not limited in this class earthwork plastic drain board) of band top box in the present embodiment, it constitutes plastic draining board 10, anchor slab 12, top box 13, sealing argillic horizon 14.According to the degree of depth and the thickness of above-mentioned definite middle sandy soil thin layer 15, paste sealed plastic sheet 11 at the correspondence position of plastic draining board; Plastic sheet length should be than the thickness of thin sand big 10cm, guarantee layer of sand up and down each 5cm to reach the purpose of sealing layer of sand; The alite paste material should use air-locked resinous material, keeps sealing fully.
(5) plate and record pore water pressure: plastic draining board is being inserted the stratum, limit insert edge record pore water pressure.According to the pore water pressure in the insertion process, utilize the thickness of Robertson method judgement layer of sand and write down its degree of depth.The data of the sand layer thickness in this hole and the degree of depth are pasted the foundation of waterproof plastic sheet position and length as next hole band drain.
(6) if when down there is the layer of sand that need not to handle in argillic horizon, plastic draining board should have a segment distance to guarantee sealing from layer of sand, and the design formulas that band drain is squeezed into effective depth in the argillic horizon to the distance of layer of sand end face with definite plastic draining board of propositions such as Chai is determined.
(7) repeating step (4) to (6) is finished the plate operation at next position plate until whole zone.
(8) on topsoil, lay a header, the flexible pipe of header and each tape drum plastic draining board is joined; Header is connected with jet vacuum pump, as shown in Figure 3;
(9) vacuumize: start vacuum extractor the aqueous vapor in the band drain top box is extracted out, in top box, form negative pressure and be added in the soft foundation.When vacuumizing, open the cone valve in the flexible pipe; During termination of pumping, close cone valve.Keep the vacuum state in the top box.
(10) repeat pressurization as required and repeat to vacuumize;
(11) construction finishes.
The effect of present embodiment: after adopting above-mentioned partially sealed plastic draining board, can prevent gas leakage effectively, reduce the loss that vacuum is pressed in the precompressed process, vacuum be pressed act on argillic horizon fully.Effectively improve the vacuum of whole preconsolidation soft foundation, though also can keep when having thin sand to exist vacuum reach-more than the 65kPa.The equipment aspect only needs additional ventage piezometer on the plate bar, makes comparatively simple.Carry out at the scene of sticking on of sealed plastic sheet on the plastic draining board, easy to operate.
Claims (8)
1. method that improves thin-sand-layer-filling soft clay foundation vacuum degree, it is characterized in that, determine clay distribution and character by the ground pore water pressure that each The attracted numbers of pore pressure gauge probe test is installed on the termination of plate steel pipe, paste the sealed plastic sheet at the absolute altitude place of earthwork plastic drain board thin sand then gas-permeable channels cut off, specifically may further comprise the steps:
(1) construction equipment setting a: round steel pipe is set in the sleeve pipe side of common plastics band drain board-plugging device, the probe of its end installing hole pressure type static sounding, and cable is set, and the pore water pressure recorder that leads to the face of land in the steel pipe, the pore water pressure that is used to write down the plate process changes;
(2) need are carried out the area dividing leveling of plate, and put on the position of the plastic draining board that will insert by designing requirement on the face of land;
(3) confirm on-the-spot clay distribution: carry out the position that vacuum preconsolidation is reinforced, insert first plastic draining board, the pore water pressure of record plate process changes, according to the pore water pressure situation of change, determine the distributed depth and the thickness on stratum, and determine the coefficient of consolidation and the transmission coefficient of each soil layer, comprise the thickness and the distributed depth of sandy soil layer;
(4) paste the sealed plastic sheet:, paste the sealed plastic sheet at the correspondence position of plastic draining board according to the thickness and the distributed depth of the sandy soil layer of determining in the previous step;
(5) plate and record pore water pressure: plastic draining board is being inserted the stratum, limit insert edge record pore water pressure, judge the thickness of layer of sand and write down its degree of depth according to the pore water pressure in the insertion process, the data of the sand layer thickness in this hole and the degree of depth are pasted the foundation of waterproof plastic sheet position and length as next hole band drain;
(6) if when down there is the layer of sand that need not to handle in argillic horizon, plastic draining board should have a segment distance to guarantee sealing from layer of sand;
(7) repeating step (4) to (6) is finished the plate operation at next position plate until whole zone;
(8) on topsoil, lay a header, the flexible pipe of header and each tape drum plastic draining board is joined, header is connected with jet vacuum pump;
(9) vacuumize: start vacuum extractor the aqueous vapor in the band drain top box is extracted out, in top box, form negative pressure and be added in the soft foundation, when vacuumizing, open the cone valve in the flexible pipe, during termination of pumping, close cone valve, keep the vacuum state in the top box.
2. the method for raising thin-sand-layer-filling soft clay foundation vacuum degree according to claim 1 is characterized in that, in the described step (2), need is carried out the area dividing leveling of plate, makes mid portion be higher than remainder.
3. the method for raising thin-sand-layer-filling soft clay foundation vacuum degree according to claim 1, it is characterized in that, in the described step (3), utilize the regularity of distribution of pore water pressure to determine the distributed depth and the thickness on stratum, and determine the coefficient of consolidation and the transmission coefficient of each soil layer.
4. the method for raising thin-sand-layer-filling soft clay foundation vacuum degree according to claim 1 is characterized in that, in the described step (4), plastic sheet length is than the big 10cm of thickness of thin sand, guarantee layer of sand up and down each 5cm with the sealing layer of sand.
5. according to the method for claim 1 or 4 described raising thin-sand-layer-filling soft clay foundation vacuum degrees, it is characterized in that in the described step (4), pasting the used alite paste material of sealed plastic sheet is air-locked resinous material, keep sealing fully.
6. the method for raising thin-sand-layer-filling soft clay foundation vacuum degree according to claim 1 is characterized in that, in the described step (5), and the thickness of layer of sand and write down its degree of depth and utilize the regularity of distribution of pore water pressure to judge.
7. the method for raising thin-sand-layer-filling soft clay foundation vacuum degree according to claim 1, it is characterized in that, in the described step (6), plastic draining board should the design formulas apart from squeeze into effective depth in the argillic horizon with definite plastic draining board between layer of sand be determined.
8. the method for raising thin-sand-layer-filling soft clay foundation vacuum degree according to claim 1 is characterized in that, after described step (9) finishes, repeats pressurization and repeats to vacuumize.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102116019A (en) * | 2009-12-31 | 2011-07-06 | 上海港湾软地基处理工程(集团)有限公司 | Method for rapidly treating soft foundation through high vacuum densification |
| CN102535431A (en) * | 2012-03-14 | 2012-07-04 | 天津港(集团)有限公司 | Method for quickly forming blown and filled ultra-soft soil foundation surface layer duricrust and device for realizing method |
| CN102733371A (en) * | 2012-07-18 | 2012-10-17 | 王军 | Closed direct-sucking sectional vacuum preloading foundation treatment method |
| CN103966998A (en) * | 2014-04-30 | 2014-08-06 | 中交天津港湾工程研究院有限公司 | Reinforcement technology and device for deep soft soil foundation comprising sandy soil interbed |
| CN105158138A (en) * | 2015-08-05 | 2015-12-16 | 宁波大学 | Detection apparatus of soil permeability |
| 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 |
| CN106894406A (en) * | 2017-02-24 | 2017-06-27 | 南京工业大学 | Vacuum preloading foundation treatment method adopting positioning permeable pipe |
| CN107190728A (en) * | 2017-06-26 | 2017-09-22 | 中交航局第三工程有限公司 | A kind of drainage plate striking device and method |
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2007
- 2007-10-18 CN CNB2007100471419A patent/CN100549305C/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102116019A (en) * | 2009-12-31 | 2011-07-06 | 上海港湾软地基处理工程(集团)有限公司 | Method for rapidly treating soft foundation through high vacuum densification |
| CN102535431A (en) * | 2012-03-14 | 2012-07-04 | 天津港(集团)有限公司 | Method for quickly forming blown and filled ultra-soft soil foundation surface layer duricrust and device for realizing method |
| CN102535431B (en) * | 2012-03-14 | 2014-09-17 | 天津港(集团)有限公司 | Method for quickly forming blown and filled ultra-soft soil foundation surface layer duricrust and device for realizing method |
| CN102733371A (en) * | 2012-07-18 | 2012-10-17 | 王军 | Closed direct-sucking sectional vacuum preloading foundation treatment method |
| CN102733371B (en) * | 2012-07-18 | 2015-06-24 | 温州大学 | Closed direct-sucking sectional vacuum preloading foundation treatment method |
| CN103966998A (en) * | 2014-04-30 | 2014-08-06 | 中交天津港湾工程研究院有限公司 | Reinforcement technology and device for deep soft soil foundation comprising sandy soil interbed |
| CN105158138A (en) * | 2015-08-05 | 2015-12-16 | 宁波大学 | Detection apparatus of soil permeability |
| 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 |
| CN106894406A (en) * | 2017-02-24 | 2017-06-27 | 南京工业大学 | Vacuum preloading foundation treatment method adopting positioning permeable pipe |
| CN107190728A (en) * | 2017-06-26 | 2017-09-22 | 中交航局第三工程有限公司 | A kind of drainage plate striking device and method |
| CN107190728B (en) * | 2017-06-26 | 2022-10-18 | 中交一航局第三工程有限公司 | Drainage plate setting device and method |
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