CN105862936A - Soft foundation treatment test device for stimulating vacuum joint gas injection - Google Patents

Soft foundation treatment test device for stimulating vacuum joint gas injection Download PDF

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Publication number
CN105862936A
CN105862936A CN201610243151.9A CN201610243151A CN105862936A CN 105862936 A CN105862936 A CN 105862936A CN 201610243151 A CN201610243151 A CN 201610243151A CN 105862936 A CN105862936 A CN 105862936A
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China
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test
gas injection
soil
hollow ball
soft
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CN201610243151.9A
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Chinese (zh)
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CN105862936B (en
Inventor
屠红珍
谢立全
杨友良
赵丁灵
叶国兴
夏来琦
方娟
范与李
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Wenzhou Traffic Technology School
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Wenzhou Traffic Technology School
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D33/00Testing foundations or foundation structures

Abstract

The invention relates to a soft foundation treatment test device for stimulating vacuum joint gas injection. A transparent sample preparation membrane is tightly fitted to the inner side wall of a test soil box; the transparent sample preparation membrane is used for sealing to form a test cavity which provides a sealed environment for test soft soil; a soil loading hole and a gas exhaust hole, which communicate with the test cavity, are formed in the transparent sample preparation membrane; a gas injection hollow ball is arranged in the test cavity, and a gas injection guide tube communicates with the gas injection hollow ball; and a plastic water draining plate is arranged in the test soft soil and is connected with a water draining guide tube. According to the soft foundation treatment test device, the transparent test soil box and the transparent sample preparation membrane are used for sealing a test soil body, so that the water draining effect in a vacuum pre-compression process and influence effect after pressure gas injection can be intuitively monitored; a rigid loading plate is arranged above the test soft soil, and vertical uniform loading is applied to stimulate soft soil stress environments at different depth positions, so that the soft foundation treatment test device is especially suitable for stimulating a deep and thick soft soil foundation, and can simultaneously implement different vacuum pre-compression and pressure gas injection schemes, and therefore, the soft foundation treatment effect of the vacuum joint gas injection can be stimulated very well.

Description

A kind for the treatment of of soft foundation experimental rig simulating vacuum combined gas injection
Technical field
The present invention relates to Soft foundation treatment technical field, more specifically, it relates to a kind of mould Intend the treatment of soft foundation experimental rig of vacuum combined gas injection.
Background technology
Flourish along with coastal, city along the river's economy and capital construction, and further Urban development planning, there is the situation that land-based area land used is not enough, will dredge out in more domestic harbours Mud be used for sea reclamation or structure bunder land-based area, this has become as land development Important means.Such as 6696 kilometers of coastline, Zhejiang Province, ranks first in the country, and area 500 is flat 3061, the above island of rice, side, from " 15 " to " 13 ", seaports in Zhejiang Province economy Develop on an unprecedented scale to corresponding port engineering, coastal engineering build dynamics continue to increase, rely on port The lands used such as the facing-port industry base of mouth development, Logistics Park are filled out by enclosing, substantially so large area is dredged The consolidation process dredging reclaimed ground is particularly important.The geotechnical engineering problems relevant with barged-in fill is more Coming the most prominent, key problem is the process of the soft base of barged-in fill.
In recent years, at the beginning of the soft base processing method of vacuum combined gas injection the most gradually obtains in engineering Step application, but its treatment of soft foundation effect is affected and restriction by a large amount of factors, in it note Gas influencing mechanism and control technology the most do not recognize clear, lack the theory analysis side of practicability and effectiveness Method, has the biggest blindness in engineer applied, therefore the method is the most preferably promoted Application.For making up the limitation of theory analysis, to large-area treatment of soft foundation engineering, need knot Conjunction indoor model test is analyzed, and key control technology therein is how to simulate different depth Vacuum in soft soil foundation and gas injection coupling, and not yet find that this model test fills at present Put.
Summary of the invention
Defect that the purpose of the present invention is contemplated to overcome above-mentioned prior art to exist and provide one Plant the treatment of soft foundation machine simulating vacuum combined gas injection easily realizing vacuum with gas injection coupling The experimental rig of system.
For achieving the above object, the technical scheme is that
A kind for the treatment of of soft foundation experimental rig simulating vacuum combined gas injection, including transparent sample preparation film, Plastic draining board, drainage duct, gas injection hollow ball, gas injection conduit, rigidity load plate and test Soil case;Described transparent sample preparation film fits tightly with the madial wall of test soil case, described transparent sample preparation Film seals the test cavity being formed as testing weak soil offer enclosed environment;Described transparent sample preparation film sets There is the dress soil hole and steam vent being connected with test cavity, pour into mud from dress soil hole and form test Weak soil, wherein the water body of mud is drained from steam vent with gas;Described gas injection hollow ball is placed in examination Testing in cavity, described gas injection conduit is connected with gas injection hollow ball and leads to test weak soil injection pressure gas Body;Described plastic draining board is placed in test weak soil, is connected with drainage duct, leads through draining Pipe carries out vacuum preloading to test weak soil;Described rigidity load plate is arranged on test weak soil Side, implements uniform load, the weak soil ambient stress of simulation different depth position to weak soil.
The present invention is arranged further: described plastic draining board is arranged on the upper strata of test weak soil.
The present invention is arranged further: described plastic draining board is positioned at immediately below dress soil hole, is embedded in In test weak soil.
The present invention is arranged further: described transparent sample preparation film is made by silastic material, described Test soil case is cylindric.
The present invention is arranged further: described gas injection hollow ball is arranged on the lower floor of test weak soil.
The present invention is arranged further: described gas injection hollow ball is provided with injecting hole, described gas injection The spherome surface of hollow ball is enclosed with non-woven fabrics.
The present invention is arranged further: the uniform cloth of described injecting hole is at 1/4th of gas injection hollow ball On sphere, described injecting hole is centrally disposed towards test weak soil.
Compared with prior art, the present invention is simple to operate, monitoring is convenient, has highlighted below excellent Point:
1). the present invention uses the test soil case of cylindrical shape, and is packaged with transparent sample preparation film, The impact after the drainage effect during vacuum preloading injects with pressed gas can be monitored intuitively Effect, and adapt to the consolidation of weak soil, sedimentation and deformation, during being beneficial to simulation vacuum preloading Soil body discharging consolidation process.
2). the present invention installs rigidity load plate at weak soil end face, it is easy to implement vertically uniformly to add Carry, the weak soil ambient stress of simulation different depth position, be particularly suited for deep soft soil foundation Simulation.
3). the present invention can implement different vacuum preloadings and pressed gas injecting scheme simultaneously, from And simulate the treatment of soft foundation effect of vacuum combined gas injection well.
4). plastic draining board model in the present invention and test length, gas injection hollow ball position, Vacuum preloading and pressed gas injecting scheme all can adjust, as required on the basis of comparative analysis Optimal enforcement effect, result of the test can directly apply to engineering, reduces at following soft soil foundation Reason cost.
Accompanying drawing explanation
Fig. 1 is the knot of a kind for the treatment of of soft foundation experimental rig simulating vacuum combined gas injection of the present invention Structure schematic diagram.
Fig. 2 is bowing of a kind for the treatment of of soft foundation experimental rig simulating vacuum combined gas injection of the present invention TV structure schematic diagram.
Fig. 3 is gas injection conduit and the structural representation of gas injection hollow ball note.
In figure 1, soft soil foundation;2, transparent sample preparation film;3, plastic draining board;4, draining Conduit;5, gas injection hollow ball;6, gas injection conduit;7, rigidity load plate;8, steam vent; 9, test soil case;10, dress soil hole.
Detailed description of the invention
1 to Fig. 3 treatment of soft foundation examination of simulating vacuum combined gas injection a kind of to the present invention referring to the drawings Experiment device is described in further details.
A kind for the treatment of of soft foundation experimental rig simulating vacuum combined gas injection, its structure such as Fig. 1 is to figure Shown in 3, this experimental rig include test weak soil 1, transparent sample preparation film 2, plastic draining board 3, Drainage duct 4, gas injection hollow ball 5, gas injection conduit 6, rigidity load plate 7 and test soil case 9, Described transparent sample preparation film 2 fits tightly with the madial wall of test soil case 9, described transparent sample preparation film 2 seal the test cavity being formed as testing weak soil offer enclosed environment;Described transparent sample preparation film 2 It is provided with and tests dress soil hole 10 and the steam vent 8 that cavity is connected.
Wherein the bottom of drainage duct 4 is connected with plastic draining board 3, and the other end is with vavuum pump even Connecing, its operating principle is identical with conventional vacuum preloading method, described gas injection conduit 6 one end and gas injection Hollow ball 5 connects, and the other end is connected with air compressor machine, and air compressor machine provides constant pressed gas.
On 1/4th spheres of gas injection hollow ball 5, uniformly lay and be largely used to gas injection Pore, can be from all directions even into test weak soil 1 so that injecting gas, owing to gas injection is hollow Ball 5 is arranged on the bottom outside of test weak soil 1, so having only to four to gas injection hollow ball 5 / mono-sphere carries out injecting hole laying.
Test weak soil 1 is encapsulated in transparent sample preparation film 2, the unnecessary water body of soil body surface and gas Body is all discharged from steam vent 8, arranges long fine non-woven fabrics bottom steam vent 8, and soil particle will not Running off from this hole, after sample preparation completes, by steam vent 8 covered and enclosed, rigidity load plate 7 is installed On test weak soil 1, the upper surface of test weak soil 1 must be smooth, so that rigidity loads Plate 7 horizontal setting, vertically loading uniformly, in rigidity load plate 7, can carry out uniform load, Soft soil foundation ambient stress at simulation different depth.
Test soil case 9 is cylindric, and for transparent organic glass material, height is 3 meters, diameter It is 1.5 meters, wall thickness 20mm;Transparent sample preparation film 2 is silastic material, high transparency, thickness For 3mm;It is arranged at the steam vent 8 of transparent sample preparation film 2 upper surface, a diameter of 5mm, permissible Add a cover closing;Plastic draining board 3 is Type B, a length of 1 meter;Drainage duct 4 and gas injection are led The PE tracheae that pipe 6 uses external diameter to be 4.6mm.Gas injection hollow ball 5 is steel hollow ball, outward Footpath is 5cm, wall thickness 2mm, a diameter of 0.5mm of injecting hole, arrangement pitch 5mm;Gas injection is hollow Ball 5 is with long fine non-woven wraps, it is intended to avoid earth fine grained to leak into gas injection hollow ball 5;Just Property load plate 7 be steel plate, thickness 20mm, diameter than test soil the case 9 little 5mm of internal diameter.Dress soil Hole 10 is the silicone rubber tube being connected with transparent sample preparation film 2, a diameter of 10cm;Steam vent 8 Aperture is 1cm, in order to get rid of dress soil process, soil solidifying during unnecessary water body and gas.
Its course of work is as follows:
1). lay transparent sample preparation film 2 in test soil case 9 in, the two bottom surface fits tightly, and Install gas injection hollow ball 5 and gas injection conduit 6 bottom transparent sample preparation film 2 laying, open exhaust Hole 8, closes gas injection conduit 6;
2). according to test water content of soil needs, the configuration soil body and water in proportion, mix is uniform, Form mud;
3). by uniform for mix mud, pour into transparent sample preparation film 2 from dress soil hole 10, dress Must assure that during soil that transparent sample preparation film 2 side form face is tight with the wall laminating of test soil case 9 Close;
4). after transparent sample preparation film 2 is completely filled with the soil body, by plastic draining board 3 from dress soil hole 10 insert in the soil body, and plastic draining board 3 is embedded in weak soil completely, close dress soil hole 10;
5). in soil sample rigidity installed above load plate 7, it is ensured that it installs level, it is beneficial to vertical Load uniformly;
6). load on rigidity load plate 7 so that it is the stress state of lower earthing body and engineering Actual it is consistent;
7). the standing consolidation time of mud in transparent sample preparation film 2, it is necessary to meet the soil body and reach examination Testing the required degree of consolidation, the unnecessary water body produced during standing is discharged from steam vent 8;
8). after the weak soil in transparent sample preparation film 2 reaches test requirements document, steam vent 8 is closed, Form the weak soil experimental enviroment closed;
9). open drainage duct 4, the weak soil in transparent sample preparation film 2 is carried out vacuum preloading, And timing opening and closing gas injection conduit 6 carries out the injection of pressed gas as required;
10). test can carry out related data monitoring, with vacuum drainage amount-time graph analysis The drainage effect of gas injection, studies vacuum combined gas injection with the t curve appearing S of weak soil end face Treatment of soft foundation mechanism;
11). change plastic draining board 3 length, the installation site of gas injection hollow ball 5, change Vacuum and gas injection pressure, repeat above test, comparative analysis gas injection to vacuum precompressed soft foundation at The Influencing Mechanism of reason effect, optimize plastic draining board 3 and gas injection hollow ball 5 arrangement, Vacuum and gas injection Joint Implementation scheme.
The above is only the preferred embodiment of the present invention, protection scope of the present invention not only Being confined to above-described embodiment, all technical schemes belonged under thinking of the present invention belong to the present invention's Protection domain.It should be pointed out that, for those skilled in the art, do not taking off Some improvements and modifications under principle of the invention premise, these improvements and modifications also should be regarded as this The protection domain of invention.

Claims (7)

1. simulate a treatment of soft foundation experimental rig for vacuum combined gas injection, it is characterized in that: include transparent Sample preparation film, plastic draining board, drainage duct, gas injection hollow ball, gas injection conduit, rigidity load Plate and test soil case;
Described transparent sample preparation film fits tightly with the madial wall of test soil case, described transparent sample preparation film Seal the test cavity being formed as testing weak soil offer enclosed environment;
Described transparent sample preparation film is provided with and tests dress soil hole and the steam vent that cavity is connected, from dress Soil hole pours into mud and forms test weak soil, and wherein the water body of mud is drained from steam vent with gas;
Described gas injection hollow ball is placed in test cavity, described gas injection conduit and gas injection hollow ball phase Connect to test weak soil injection pressure gas;
Described plastic draining board is placed in test weak soil, is connected with drainage duct, leads through draining Pipe carries out vacuum preloading to test weak soil;
Described rigidity load plate is arranged at above test weak soil, and weak soil is implemented uniform load, mould Intend the weak soil ambient stress of different depth position.
A kind for the treatment of of soft foundation test dress simulating vacuum combined gas injection the most according to claim 1 Put, it is characterized in that: described plastic draining board is arranged on the upper strata of test weak soil.
A kind for the treatment of of soft foundation test dress simulating vacuum combined gas injection the most according to claim 2 Put, it is characterized in that: described plastic draining board is positioned at immediately below dress soil hole, is embedded in test weak soil In.
A kind for the treatment of of soft foundation test dress simulating vacuum combined gas injection the most according to claim 1 Put, it is characterized in that: described transparent sample preparation film is made by silastic material, described test soil case For cylindrical shape.
5. according to a kind of soft base simulating vacuum combined gas injection described in claim 1 or 2 or 3 or 4 Process experimental rig, it is characterized in that: described gas injection hollow ball is arranged on the lower floor of test weak soil.
A kind for the treatment of of soft foundation experimental rig simulating vacuum combined gas injection the most as claimed in claim 5, It is characterized in that: described gas injection hollow ball is provided with injecting hole, the spheroid of described gas injection hollow ball It is coated with non-woven fabrics.
A kind for the treatment of of soft foundation experimental rig simulating vacuum combined gas injection the most as claimed in claim 6, It is characterized in that: the uniform cloth of described injecting hole is on 1/4th spheres of gas injection hollow ball, described Injecting hole is centrally disposed towards test weak soil.
CN201610243151.9A 2016-04-18 2016-04-18 A kind for the treatment of of soft foundation experimental rig for simulating vacuum combined gas injection Active CN105862936B (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100903136B1 (en) * 2009-01-16 2009-06-16 시지엔지니어링(주) Structure and method for measuring subsidence of reinforced portion of soft ground by using top pile
CN102707034A (en) * 2012-05-31 2012-10-03 东南大学 Indoor model testing device and testing method employing air-pressure splitting vacuum preloading method
RU2548631C1 (en) * 2013-12-04 2015-04-20 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Кубанский государственный технологический университет" (ФГБОУ ВПО "КубГТУ") Test method of soil foundation with pile with grill
CN104865371A (en) * 2015-05-22 2015-08-26 长沙学院 Experiment device and method for consolidation of soft foundation under vacuum condition
CN204728373U (en) * 2015-06-16 2015-10-28 河海大学 A kind of experimental facilities of simulating WATER LEVEL CHANGES in vacuum pre-compaction process
CN205617450U (en) * 2016-04-18 2016-10-05 温州交通技术学校 Test device is handled to soft base of simulation joint gas injection in vacuum

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100903136B1 (en) * 2009-01-16 2009-06-16 시지엔지니어링(주) Structure and method for measuring subsidence of reinforced portion of soft ground by using top pile
CN102707034A (en) * 2012-05-31 2012-10-03 东南大学 Indoor model testing device and testing method employing air-pressure splitting vacuum preloading method
RU2548631C1 (en) * 2013-12-04 2015-04-20 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Кубанский государственный технологический университет" (ФГБОУ ВПО "КубГТУ") Test method of soil foundation with pile with grill
CN104865371A (en) * 2015-05-22 2015-08-26 长沙学院 Experiment device and method for consolidation of soft foundation under vacuum condition
CN204728373U (en) * 2015-06-16 2015-10-28 河海大学 A kind of experimental facilities of simulating WATER LEVEL CHANGES in vacuum pre-compaction process
CN205617450U (en) * 2016-04-18 2016-10-05 温州交通技术学校 Test device is handled to soft base of simulation joint gas injection in vacuum

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