CN105862936B - A kind for the treatment of of soft foundation experimental rig for simulating vacuum combined gas injection - Google Patents

A kind for the treatment of of soft foundation experimental rig for simulating vacuum combined gas injection Download PDF

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Publication number
CN105862936B
CN105862936B CN201610243151.9A CN201610243151A CN105862936B CN 105862936 B CN105862936 B CN 105862936B CN 201610243151 A CN201610243151 A CN 201610243151A CN 105862936 B CN105862936 B CN 105862936B
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gas injection
experiment
soil
weak soil
hollow ball
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CN105862936A (en
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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 present invention relates to a kind for the treatment of of soft foundation experimental rig for simulating vacuum combined gas injection, transparent sample preparation film is brought into close contact with testing the madial wall of native case, and transparent sample preparation film sealing is formed as testing the experiment cavity that weak soil provides enclosed environment;Transparent sample preparation film is provided with the dress soil hole being connected with experiment cavity and steam vent;Gas injection hollow ball is placed in experiment cavity, and gas injection conduit is connected with gas injection hollow ball;Plastic draining board is placed in experiment weak soil to be connected with drainage duct;The present invention is using transparent experiment soil case, the transparent sample preparation film encapsulation experiment soil body, the drainage effect during vacuum preloading and the influence after pressed gas injection can intuitively be monitored, rigid load plate is arranged above experiment weak soil, implement vertical uniform load, simulate the weak soil ambient stress of different depth position, be particularly suitable for use in the simulation of deep soft soil foundation, different vacuum preloadings and pressed gas injecting scheme can be implemented simultaneously, so as to the treatment of soft foundation effect of the vacuum combined gas injection of fine simulation.

Description

A kind for the treatment of of soft foundation experimental rig for simulating vacuum combined gas injection
Technical field
The present invention relates to Soft foundation treatment technical field, more specifically, it relates to which a kind of simulate vacuum combined gas injection Treatment of soft foundation experimental rig.
Background technology
With flourishing for coastal, city along the river's economy and infrastructure, and further urban development planning, state There is the situation of land-based area land used deficiency in some interior harbours, will dredge mud out and are used for sea reclamation or construct bunder Land-based area, this has become the important means of land development.Such as 6696 kilometers of Zhejiang Province coastline, rank first in the country, area 500 3061, island more than square metre, from " 15 " to " 13 ", seaports in Zhejiang Province economy develop on an unprecedented scale to corresponding port Mouth engineering, coastal engineering are built dynamics and continued to increase, and rely on the lands used such as facing-port industry base, the Logistics Park of port development basic Filled out by enclosing, so the consolidation process of large area dredging and reclamation soil base is particularly important.The geotechnical engineering problems relevant with barged-in fill More and more prominent, key problem is the processing of the soft base of barged-in fill.
In recent years, the soft base processing method of vacuum combined gas injection gradually obtains Preliminary Applications in engineering, but its is soft Base treatment effect is influenceed and restriction by a large amount of factors, in it gas injection influencing mechanism and control technology it is clear also without understanding Chu, lack practical and effective theoretical analysis method, there is very big blindness in engineer applied, thus this method not yet obtain compared with Good popularization and application.To make up the limitation of theory analysis, the treatment of soft foundation engineering to large area with reference to indoor model, it is necessary to try Test and analyzed, key control technology therein is that the vacuum how simulated in different depth soft soil foundation couples work with gas injection With, and not yet find the model test apparatus at present.
The content of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide one kind easily realizes vacuum With the experimental rig of the treatment of soft foundation mechanism of the vacuum combined gas injection of simulation of gas injection coupling.
To achieve the above object, the invention provides following technical scheme:
A kind for the treatment of of soft foundation experimental rig for simulating vacuum combined gas injection, including transparent sample preparation film, plastic draining board, draining Conduit, gas injection hollow ball, gas injection conduit, rigid load plate and the native case of experiment;The transparent sample preparation film and the inner side for testing native case Wall is brought into close contact, and the transparent sample preparation film sealing is formed as testing the experiment cavity that weak soil provides enclosed environment;The transparent system Sample film is provided with the dress soil hole being connected with experiment cavity and steam vent, and mud formation experiment weak soil, wherein mud are poured into from native hole is filled The water body of slurry is drained with gas from steam vent;The gas injection hollow ball is placed in experiment cavity, and the gas injection conduit is empty with gas injection Bulbus cordis, which is connected, leads to experiment weak soil injection pressed gas;The plastic draining board is placed in experiment weak soil, is connected with drainage duct Connect, vacuum preloading is carried out to experiment weak soil through drainage duct;Described rigid load plate is arranged above experiment weak soil, to weak soil Implement uniform load, simulate the weak soil ambient stress of different depth position.
It is of the invention further to set:The plastic draining board is arranged on the upper strata of experiment weak soil.
It is of the invention further to set:The plastic draining board is embedded in experiment weak soil positioned at filling immediately below native hole.
It is of the invention further to set:Described transparent sample preparation film is made by silastic material, and the native case of experiment is cylinder Shape.
It is of the invention further to set:The gas injection hollow ball is arranged on the lower floor of experiment weak soil.
It is of the invention further to set:Described gas injection hollow ball is provided with injecting hole, the spheroid table of described gas injection hollow ball Bread is wrapped with non-woven fabrics.
It is of the invention further to set:The uniform cloth of injecting hole is on a quarter sphere of gas injection hollow ball, the note Stomata is centrally disposed towards experiment weak soil.
Compared with prior art, the present invention is simple to operate, monitoring is convenient, has advantage following prominent:
1) the present invention is using cylindric experiment soil case, and is packaged with transparent sample preparation film, can intuitively monitor vacuum Drainage effect in pre-compaction process and the influence after pressed gas injection, and the consolidation of weak soil, sedimentation and deformation are adapted to, profit Soil body discharging consolidation process during vacuum preloading is simulated.
2) the present invention installs rigid load plate, vertical uniform load easy to implement, simulation different depth position in weak soil top surface The weak soil ambient stress put, the simulation for the deep soft soil foundation that is particularly suitable for use in.
3) the present invention can implement different vacuum preloadings and pressed gas injecting scheme simultaneously, so as to which fine simulation is true The treatment of soft foundation effect of empty joint gas injection.
4) the plastic draining board model in the present invention and test length, the hollow ball position of gas injection, vacuum preloading and pressure gas Body injecting scheme can adjust as needed, and the optimal enforcement effect on the basis of comparative analysis, result of the test can directly apply to Engineering, reduce the Soft Ground cost in future.
Brief description of the drawings
Fig. 1 is a kind of structural representation for the treatment of soft foundation experimental rig for simulating vacuum combined gas injection of the present invention.
Fig. 2 is a kind of overlooking the structure diagram for the treatment of soft foundation experimental rig for simulating vacuum combined gas injection of the present invention.
Fig. 3 is the structural representation that gas injection conduit and gas injection hollow ball are noted.
1, soft soil foundation in figure;2nd, transparent sample preparation film;3rd, plastic draining board;4th, drainage duct;5th, gas injection hollow ball;6th, note Airway;7th, rigid load plate;8th, steam vent;9th, native case is tested;10th, native hole is filled.
Embodiment
1 to Fig. 3 treatment of soft foundation experimental rig for simulating vacuum combined gas injection a kind of to the present invention is done further referring to the drawings Describe in detail.
A kind for the treatment of of soft foundation experimental rig for simulating vacuum combined gas injection, as shown in Figure 1 to Figure 3, the experiment fills its structure Put including experiment 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 The madial wall of load plate 7 and the native case 9 of experiment, the transparent sample preparation film 2 and the native case 9 of experiment is brought into close contact, the transparent sample preparation film 2 Sealing is formed as testing the experiment cavity that weak soil provides enclosed environment;The transparent sample preparation film 2 is provided with to be connected with experiment cavity Dress soil hole 10 and steam vent 8.
Wherein the bottom of drainage duct 4 is connected with plastic draining board 3, and the other end is connected with vavuum pump, its operating principle with Conventional vacuum preloading method is identical, and described one end of gas injection conduit 6 is connected with gas injection hollow ball 5, and the other end is connected with air compressor machine, pneumatics Machine provides constant pressed gas.
On a quarter sphere of gas injection hollow ball 5, the pore for being largely used to gas injection is uniformly laid, so that injection gas Physical efficiency from all directions even into experiment weak soil 1, due to gas injection hollow ball 5 be arranged on experiment weak soil 1 bottom outside, so only Need to carry out injecting hole laying to a quarter sphere of gas injection hollow ball 5.
Experiment weak soil 1 is encapsulated in transparent sample preparation film 2, and the unnecessary water body and gas of soil body surface are from the row of steam vent 8 Go out, long fine non-woven fabrics is set in the bottom of steam vent 8, soil particle will not be lost in from the hole, after the completion of sample preparation, steam vent 8 is capped Closed, rigid load plate 7 is arranged on experiment weak soil 1, and the upper surface for testing weak soil 1 must be smooth, so that rigidity loads Plate 7 can horizontal setting, vertical loading it is uniform, in rigid load plate 7, carry out uniform load, simulate the weak soil at different depth Foundation stress environment.
Native case 9 is tested as cylindrical shape, is transparent organic glass material, is highly 3 meters, a diameter of 1.5 meters, wall thickness 20mm; Transparent sample preparation film 2 is silastic material, high transparency, thickness 3mm;The steam vent 8 of the transparent upper surface of sample preparation film 2 is arranged at, directly Footpath is 5mm, can be capped closing;Plastic draining board 3 is Type B, and length is 1 meter;Drainage duct 4 and gas injection conduit 6 use external diameter For 4.6mm PE tracheaes.Gas injection hollow ball 5 is steel hollow ball, external diameter 5cm, wall thickness 2mm, a diameter of 0.5mm of injecting hole, Arrange spacing 5mm;Gas injection hollow ball 5 is with the fine non-woven wraps of length, it is intended to avoids soil fine grained from leaking into gas injection hollow ball 5;Just Property load plate 7 be steel plate, thickness 20mm, diameter is smaller 5mm than testing the native internal diameter of case 9.Native hole 10 is filled to be connected with transparent sample preparation film 2 Silicone rubber tube, a diameter of 10cm;The aperture of steam vent 8 is 1cm, more during native process, soil solidifying to exclude to fill Remaining water body and gas.
Its course of work is as follows:
1) lays transparent sample preparation film 2 in testing in native case 9, and the two bottom surface is brought into close contact, and is laying transparent sample preparation film 2 Bottom installing gas injection hollow ball 5 and gas injection conduit 6, open steam vent 8, close gas injection conduit 6;
2) configures the soil body and water, mix is uniform, forms mud in proportion according to experiment water content of soil needs;
3) pours into the uniform mud of mix in transparent sample preparation film 2 from native hole 10 is filled, and must assure that during dress soil The bright side form face of sample preparation film 2 is bonded closely with testing the wall of native case 9;
4) after the transparent sample preparation films 2 of are completely filled with the soil body, plastic draining board 3 is inserted in the soil body from native hole 10 is filled, plastic row Water plate 3 is embedded in weak soil completely, and closing fills native hole 10;
5) is in soil sample rigid load plate 7 installed above, it is ensured that it installs level, uniform beneficial to vertical loading;
6) is loaded on rigid load plate 7, makes the stress state of its lower earthing body and engineering is actual is consistent;
7) in the transparent sample preparation films 2 of mud standing consolidation time, it is necessary to meet the soil body reach experiment needed for the degree of consolidation, it is quiet Caused unnecessary water body is discharged from steam vent 8 during putting;
8) after the weak soil in the transparent sample preparation films 2 of reaches test requirements document, steam vent 8 is closed, forms the weak soil experiment of closing Environment;
9) opens drainage duct 4, vacuum preloading is carried out to the weak soil in transparent sample preparation film 2, and timing is opened and closed as needed Gas injection conduit 6 carries out the injection of pressed gas;
10) related data monitoring can be carried out in experiments, the drainage effect of gas injection is analyzed with vacuum drainage amount-time graph, The treatment of soft foundation mechanism of vacuum combined gas injection is studied with the t curve appearing S of weak soil top surface;
11) changes the length of plastic draining board 3, the installation site of gas injection hollow ball 5, change vacuum and gas injection pressure, weight Tested more than multiple, comparative analysis gas injection optimizes plastic draining board 3 and gas injection to the Influencing Mechanism of vacuum precompressed soft foundation treatment effect Arrangement, vacuum and the gas injection Joint Implementation scheme of hollow ball 5.
Described above is only the preferred embodiment of the present invention, and protection scope of the present invention is not limited merely to above-mentioned implementation Example, all technical schemes belonged under thinking of the present invention belong to protection scope of the present invention.It should be pointed out that for the art Those of ordinary skill for, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications It should be regarded as protection scope of the present invention.

Claims (3)

1. a kind for the treatment of of soft foundation experimental rig for simulating vacuum combined gas injection, it is characterized in that:Including transparent sample preparation film, plastic draining Plate, drainage duct, gas injection hollow ball, gas injection conduit, rigid load plate and the native case of experiment;
The transparent sample preparation film is brought into close contact with testing the madial wall of native case, and the transparent sample preparation film sealing is formed as testing weak soil The experiment cavity of enclosed environment is provided;
The transparent sample preparation film is provided with the dress soil hole being connected with experiment cavity and steam vent, and mud formation examination is poured into from native hole is filled Weak soil is tested, the wherein water body of mud is drained with gas from steam vent;
The gas injection hollow ball is placed in experiment cavity, and the gas injection conduit is connected with gas injection hollow ball leads to experiment weak soil injection Pressed gas;The plastic draining board is placed in experiment weak soil, is connected with drainage duct, and experiment weak soil is entered through drainage duct Row vacuum preloading;
The rigid load plate is arranged above experiment weak soil, is implemented uniform load to weak soil, is simulated the soft of different depth position Soil stress environment;
The plastic draining board is arranged on the upper strata of experiment weak soil;
The plastic draining board is embedded in experiment weak soil positioned at filling immediately below native hole;
Described transparent sample preparation film is made by silastic material, and the native case of experiment is cylindrical shape;
The gas injection hollow ball is arranged on the lower floor of experiment weak soil.
2. a kind for the treatment of of soft foundation experimental rig for simulating vacuum combined gas injection as claimed in claim 1, it is characterized in that:Described Gas injection hollow ball is provided with injecting hole, and the spherome surface of described gas injection hollow ball is enclosed with non-woven fabrics.
3. a kind for the treatment of of soft foundation experimental rig for simulating vacuum combined gas injection as claimed in claim 2, it is characterized in that:The note For the uniform cloth of stomata on a quarter sphere of gas injection hollow ball, the injecting hole is centrally disposed towards experiment 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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