CN104790442B - The full-scale model test test device of vacuum method soft soil foundation and its method for experimental test - Google Patents

The full-scale model test test device of vacuum method soft soil foundation and its method for experimental test Download PDF

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Publication number
CN104790442B
CN104790442B CN201510227596.3A CN201510227596A CN104790442B CN 104790442 B CN104790442 B CN 104790442B CN 201510227596 A CN201510227596 A CN 201510227596A CN 104790442 B CN104790442 B CN 104790442B
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vacuum
test
draining board
main support
meter
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CN104790442A (en
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王军
蔡袁强
王鹏
符洪涛
马建军
耿鹏飞
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Wenzhou University
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Wenzhou University
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D33/00Testing foundations or foundation structures
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/02Improving by compacting
    • E02D3/10Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains

Abstract

The invention discloses a kind of full-scale model test test device of vacuum method soft soil foundation, its vacuum measurement system includes draining board, vacuum tube and vacuum meter, described pore water pressure measuring system includes pore pressure meter, wire and T-shaped binding post, experiment test device is also configured with support, support includes bottom bracket, column and top-support, and draining board is fixed on column using removable formal similarity;Partial drainage plate is connected with vacuum pump by flexible pipe, and vacuum tube is connected with syringe needle, in the draining space under the filter membrane of draining board that syringe needle insertion is not connected with vacuum pump;The differing heights that pore pressure meter is fixed on the column of support sentence the pore water pressure measuring differing heights position.Present invention also offers the method that experimental test is carried out using above-mentioned test device.In the present invention, the differing heights that pore pressure meter is fixed on support sentence the pore water pressure measuring soil body differing heights, avoid the error that the pore pressure meter position caused because soil deformation is excessive does not know to bring to measurement data, solve the measurement difficult problem of pore pressure and vacuum in the soil body and draining board.

Description

The full-scale model test test device of vacuum method soft soil foundation and its test The method of test
Technical field
The present invention relates to a kind of full-scale model test test device of vacuum method soft soil foundation.The present invention also relates to And a kind of method that the full-scale model test test device using vacuum method soft soil foundation carries out experimental test.
Background technology
With the fast development of coastal area economy, it is becoming tight land resource day, polder becomes this difficult problem of solution Main path, polder mainly blows extra large epeirogenetic, and offshore remotely sand content is few in seafloor soil, be mostly fine grain Silt clay, this kind of soil property has water content height, compressibility is strong, thixotropy is big, the low feature of shearing strength.In Practical Project In, processing the conventional method of this barged-in fill has vacuum method, preloading, heavy-tamping method, low-yield densification and well point row Water etc..
The methods such as preloading, strong rammer are more satisfactory to the treatment effect of sand, silt, but using said method to High water cut When the bury of rate, reclaimed ground and soft clay side slope are processed, have that processing cost is high, long in time limit, treatment effeciency It is low and the problems such as effect is undesirable.
Vacuum method processes the very long history of soft soil foundation, and its ultimate principle is by imperial family of Sweden geology earliest Institute Kjellmen proposed in nineteen fifty-two, but was limited to construction technology at that time and technology, and technique of soft soil foundation treatment is not in reality Be used widely in the engineering of border, can quickly discharge most Free water in soil with vacuum method, process high-moisture percentage, Low intensive bury, barged-in fill etc. have significant advantage.China introduces the eighties in 20th century and studies this technology, early in Succeed in the basement process at Tianjin harbour application, thus started the application process in China for the vacuum preloading.But it is true , often there is mud and block vacuum tube in empty preloading method, the problems such as lead to vacuum measurement in draining board and the soil body difficult, thus Draining board vacuum measurement is led to be lost efficacy.Further, since the reason such as sedimentation, pore pressure position is continually changing, and leads to pore pressure measurement to be lost Very.Before making the present invention, model test apparatus are often simple insertion draining in the model bucket of rectangular mold molding box or circle Pore pressure meter arranged by plate, and the soil body occurs moderate finite deformation in vacuum, and pore pressure meter is big with native change in displacement;With regard in plate On the measurement of vacuum, the direct colligation of vacuum tube and draining board, and cause mud to be easily accessible vacuum tube, block vacuum tube, It is difficult to measure.Measurement further for vacuum in mud there is presently no relevant report.
Content of the invention
The technical problem to be solved is that the large-scale model providing a kind of vacuum method soft soil foundation is tried Test test device, the close beta element of this experiment test device will not be deformed and displacement, it is dirty that its vacuum tube is difficult alluvial Mud, and the length of draining board and and pore pressure meter installation site more flexible, be easy to obtain more accurate and extensive data. The technical problem to be solved also includes providing a kind of big pattern using above-mentioned vacuum method soft soil foundation The method that type experiment test device carries out experimental test.
For this reason, the full-scale model test test device of the vacuum method soft soil foundation of present invention offer, including true Reciprocal of duty cycle measuring system, pore water pressure force measuring system, described vacuum measurement system includes draining board, vacuum tube and vacuum meter, Described pore water pressure measuring system includes pore pressure meter, wire and T-shaped binding post, and described pore pressure meter passes through wire, T-shaped binding post even Connect plate reading device in succession, described experiment test device is also configured with main support, main support includes bottom bracket, column and top and props up Frame, described draining board is fixed on column using removable formal similarity;Partial drainage plate is connected with vacuum extractor by flexible pipe, Described vacuum tube is connected with syringe needle, in the draining space under the filter membrane of draining board that syringe needle insertion is not connected with vacuum pump;Described hole The differing heights of the column that pressure meter is fixed on main support sentence the pore water pressure of measurement differing heights position.
Present invention also offers being entered using the full-scale model test test device of above-mentioned vacuum method soft soil foundation The method of row experimental test, including:The described main support that A, selection are mated with test model, determines according to the height banketing and connects The length of the draining board of vacuum pump, and with tying up silk, draining board is fixed on the column of main support, for measurement soil body vacuum The draining board of clip needs colligation at the differing heights of column by measurement;B, the insertion of the vacuum tube of connecting needle is not connected with true The draining board of empty pump, described syringe needle inserts the space of draining board, and described vacuum tube is fixed on main support;C, described vacuum Pipe end connects vacuum meter, the corresponding measurement position of each vacuum meter should annotation in advance, facilitate later data compilation;D, described hole Pressure meter, with tying up a colligation to the differing heights of main support, needs to lay quantity with height increase and decrease according to measurement, described pore pressure meter Numbering and its position answer annotation accurate;E, by soil sample layering be filled to design height it is ensured that each pipeline no acute angle bending, soil Body is highly higher than the height of draining board, and soil body surface lays diaphragm seal, and surrounding carries out pressing ditch;F, the described row of evacuation Water plate connects plastics wired hose by hand-type joint, and each plastic flexible pipe is connected to transparent vessel by three way cock;Transparent Punched at the bottle stopper of container, described vacuum meter is installed on bottle stopper, carried out encapsulation process with unsintered tape and fluid sealant;Institute State transparent vessel to connect to vacuum pump by plastic vacuum pipe.
Beneficial effects of the present invention are as follows:1st, by the fixing draining board of main support and pore pressure meter, pore pressure meter and draining board are made not Moderate finite deformation can occur, be conducive to measurement to obtain accurate data;2nd, pass through to change main support height and draining board length, can mould Intend different foundation treatment depth;3rd, pass through to change pore pressure meter and vacuum tube syringe needle inserts the height of draining board, the soil body can be measured Pore water pressure at differing heights and vacuum;4th, pass through to change the quantity of draining board and spacing can be simulated in true engineering not Same spacing of prefabricated drain;5th, insert the needle into the drainage channel under draining board filter membrane, mud can be intercepted and enter draining board blocking Vacuum tube;In a word, this device form simple and flexible, easy processing manufacture, low cost, strong applicability, solve the soil body and draining board Middle pore pressure and the problem of vacuum measurement difficulty.
Brief description
The structure of the full-scale model test test device of the vacuum method soft soil foundation that Fig. 1 provides for the present invention is shown It is intended to.
Fig. 2 is the structural representation of the main support in Fig. 1.
Fig. 3 is the structural representation of the vacuum extractor in Fig. 1.
Fig. 4 is the structure enlarged diagram of the draining board being inserted with syringe needle in Fig. 1.
In figure:1st, vacuum meter;2nd, vacuum pump;3rd, binding post;4th, plastics wired hose;5th, pore pressure meter;6th, balance; 7、 Transparent vessel;8th, three way cock;9th, syringe needle;10th, main support;11st, vacuum tube;12nd, draining board;14th, wire;101st, stand Post.
Specific embodiment
With reference to shown in Fig. 1, Fig. 2, the full-scale model test of the vacuum method soft soil foundation that the present invention provides is tested Device, including vacuum measurement system, pore water pressure force measuring system, described vacuum measurement system includes draining board 12, true Blank pipe 11 and vacuum meter 1, described pore water pressure measuring system includes pore pressure meter 5, wire 14 and T-shaped binding post 3, described pore pressure meter 5 pass through wire 14, T-shaped binding post 3 connects plate reading device, and described experiment test device is also configured with main support 10, main Frame 10 adopts steel main support, composite or duroplastss main support, and its shape can adopt cylindrical or cuboid or quincunx, Main support 10 includes bottom bracket, column 101 and top-support, and described draining board 12 is fixed on column using removable formal similarity On 101, in order to reserve enough upper-lower position adjustment spaces, the height of column 101 is far above the length of draining board 12;Part is arranged Water plate 12 is connected with vacuum extractor by flexible pipe, and described vacuum tube is connected with syringe needle 9, and syringe needle 9 insertion is not connected with vacuum pump In draining space under the filter membrane of draining board 12;The differing heights that described pore pressure meter 5 is fixed on the column 101 of main support 10 are sentenced The pore water pressure of measurement differing heights position.With reference to shown in Fig. 3, described vacuum extractor includes entrance and configures the saturating of vacuum meter Bright container 7, vacuum pump 2 and balance 6, transparent vessel 7 is generally conical flask, and described transparent vessel 7 is placed in the weighing position on balance 6 Put, described vacuum pump 2 is connected by vacuum tube 11 with described transparent vessel 7.
Present invention also offers being entered using the full-scale model test test device of above-mentioned vacuum method soft soil foundation The method of row experimental test, including:The model casing examination of the described main support 10 that A, selection are mated with test model, such as cuboid Test, then select the main support 10 of cuboid, determine the length of the draining board 12 connecting vacuum pump 2 according to the height banketing, be used in combination Tie up silk draining board 12 is fixed on the column 101 of main support 10, for measurement soil body vacuum, the draining board 12 of clip is pressed and surveyed Amount needs colligation at the differing heights of column 101;B, the insertion of the vacuum tube 11 of connecting needle 9 is not connected with the row of vacuum pump 2 Water plate 12, described syringe needle 9 inserts the space of draining board 12, and described vacuum tube 11 is fixed on main support 10;C, described true Blank pipe 11 termination connects vacuum meter 1, each corresponding measurement position of vacuum meter 1 should annotation in advance, facilitate later data compilation;D、 Described pore pressure meter 5, with tying up a colligation to the differing heights of main support 10, needs to lay quantity with height increase and decrease according to measurement, described The numbering of pore pressure meter 5 and its position answer annotation accurate;E, by soil sample layering be filled to the height of design it is ensured that each pipeline is no sharp Angle bends, and the soil body is highly higher than the height of draining board, and soil body surface lays diaphragm seal, and surrounding carries out pressing ditch;F, evacuation Described draining board 12 connects plastics wired hose 4 by hand-type joint, and each plastics wired hose 4 is connected by three way cock To transparent vessel 7;Punched at the bottle stopper of transparent vessel 7, described vacuum meter 1 be installed on bottle stopper, with unsintered tape and Fluid sealant carries out encapsulation process;Described transparent vessel 7 is connected to vacuum pump 2 by plastic vacuum pipe;F, carry out vacuum preloading row Water, opens vacuum pump 2, monitors vacuum meter 1, regularly measures the water yield in conical flask 7 with electronic balance 6;End to be tested, Remove diaphragm seal, excavate and banket, reclaim main support 10, plastics wired hose 4, vacuum meter 1, pore pressure meter 5 etc., treat test next time weight Multiple utilization.

Claims (8)

1. a kind of full-scale model test test device of vacuum method soft soil foundation, including vacuum measurement system, hole Gap hydraulic pressure force measuring system, described vacuum measurement system includes draining board, vacuum tube and vacuum meter, and described pore water pressure is surveyed Amount system includes pore pressure meter, wire and T-shaped binding post, and described pore pressure meter passes through wire, T-shaped binding post connects plate reading device, its Feature is:Described experiment test device is also configured with main support, and main support includes bottom bracket, column and top-support, described Draining board is fixed on column using removable formal similarity;Partial drainage plate is connected with vacuum extractor by flexible pipe, described true Blank pipe is connected with syringe needle, in the draining space under the filter membrane of draining board that syringe needle insertion is not connected with vacuum pump;Described pore pressure meter is solid The differing heights being scheduled on the column of main support sentence the pore water pressure of measurement differing heights position.
2. the full-scale model test test device of vacuum method soft soil foundation according to claim 1, its feature It is:Described main support adopts steel main support, composite main support or duroplastss main support.
3. the full-scale model test test device of vacuum method soft soil foundation according to claim 1 and 2, it is special Levying is:Described main support is using cylindrical or cuboid or quincunx.
4. the full-scale model test test device of vacuum method soft soil foundation according to claim 1 and 2, it is special Levying is:The height of described column is far above the length of draining board.
5. the full-scale model test test device of vacuum method soft soil foundation according to claim 3, its feature It is:The height of described column is far above the length of draining board.
6. the full-scale model test test device of vacuum method soft soil foundation according to claim 1 and 2, it is special Levying is:Described vacuum extractor includes transparent vessel, vacuum pump and the balance that entrance configures vacuum meter, and described transparent vessel is placed in Weighing location on balance, described vacuum pump is connected by vacuum tube with described transparent vessel.
7. the full-scale model test test device of vacuum method soft soil foundation according to claim 5, its feature It is:Described vacuum extractor includes transparent vessel, vacuum pump and the balance that entrance configures vacuum meter, and described transparent vessel is placed in sky Weighing location on flat, described vacuum pump is connected by vacuum tube with described transparent vessel.
8. a kind of full-scale model test test device using the vacuum method soft soil foundation described in claim 1 is carried out The method of experimental test, is characterized in that:Including:The described main support that A, selection are mated with test model, according to the height banketing Determine the length of the draining board connecting vacuum pump, and with tying up silk, draining board is fixed on the column of main support, for measuring the soil body The draining board of vacuum and clip needs colligation at the differing heights of column by measurement;B, by the insertion of the vacuum tube of connecting needle It is not connected with the draining board of vacuum pump, the draining space under the filter membrane of draining board that described syringe needle insertion is not connected with vacuum extractor In, and described vacuum tube is fixed on main support;C, described vacuum pipe end connect vacuum meter, the corresponding measurement of each vacuum meter Position should annotation in advance, facilitate later data compilation;D, described pore pressure meter are with tying up a colligation to the differing heights of main support, root Need to lay quantity with height increase and decrease according to measurement, the numbering of described pore pressure meter and its position answer annotation accurate;E, by soil sample Layering is filled to the height of design it is ensured that each pipeline no acute angle bends, and the soil body is highly higher than the height of draining board, and soil body surface is applied If diaphragm seal, surrounding carries out pressing ditch;F, the described draining board of evacuation is connected plastics wired hose by hand-type joint, respectively Plastics wired hose is connected to transparent vessel by three way cock;Punched at the bottle stopper of transparent vessel, by described vacuum Table is installed on bottle stopper, carries out encapsulation process with unsintered tape and fluid sealant;Described transparent vessel by plastic vacuum pipe connect to Vacuum pump;F, carry out vacuum preloading draining, open vacuum pump, monitor vacuum meter, regularly measured in conical flask with electronic balance Water yield;End to be tested, removes diaphragm seal, excavates and bankets, and reclaims main support, plastics wired hose, vacuum meter, pore pressure meter Deng, treat next time test recycling.
CN201510227596.3A 2015-05-05 2015-05-05 The full-scale model test test device of vacuum method soft soil foundation and its method for experimental test Active CN104790442B (en)

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CN105568955B (en) * 2015-12-25 2018-05-11 河海大学 The compound straight-line vacuum pre-pressed joint method experimental rig of EKG electro-osmosis methods and method
CN105756105B (en) * 2016-03-21 2018-04-10 温州大学 The pre- compression testing device of simple vacuum and the method using the pre- compression testing device test vacuum preloading efficiency of simple vacuum
CN105759013B (en) * 2016-03-21 2018-01-26 温州大学 The method that the vacuum preloading implemented using the vacuum preloading experimental rig of controllable drain bar is tested
CN107059763A (en) * 2017-01-05 2017-08-18 天津大学 One kind is without vacuum diaphragm vacuum preloading indoor model test method
CN108729430B (en) * 2018-04-23 2019-12-10 河海大学 anti-clogging hole pressure gauge and using method
CN108560618A (en) * 2018-05-18 2018-09-21 中原工学院 A kind of test apparatus of simulation Combined Vacuum-surcharge Preloading Composite Foundation Consolidation

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JP3969118B2 (en) * 2002-02-22 2007-09-05 株式会社大林組 Vacuum measuring device
JP4851226B2 (en) * 2006-04-11 2012-01-11 丸山工業株式会社 Improvement method for soft ground
KR20110026550A (en) * 2009-09-08 2011-03-16 (주)지구환경전문가그룹 Two-way suction drain consolidation method for porewater drainage of soft ground
CN203846538U (en) * 2014-04-29 2014-09-24 中交四航工程研究院有限公司 Indoor graded vacuum preloading model test device
CN104264719A (en) * 2014-09-03 2015-01-07 上海大学 Vacuum preloading indoor model testing apparatus
CN104569341B (en) * 2014-11-28 2016-05-04 温州大学 The method of vacuum pre-pressed joint electric osmose test

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