CN107121360B - Silt flow tester - Google Patents

Silt flow tester Download PDF

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Publication number
CN107121360B
CN107121360B CN201710290449.XA CN201710290449A CN107121360B CN 107121360 B CN107121360 B CN 107121360B CN 201710290449 A CN201710290449 A CN 201710290449A CN 107121360 B CN107121360 B CN 107121360B
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sample chamber
water
sludge
baffle
sample
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CN201710290449.XA
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CN107121360A (en
Inventor
刘加才
史文韬
王旭东
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Nanjing Tech University
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Nanjing Tech University
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N11/00Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
    • G01N11/02Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by measuring flow of the material

Abstract

The invention discloses a silt flow tester, and belongs to the field of geotechnical engineering. The invention comprises the following steps: the device comprises a pressure water head container, a connecting pipe, a water stop valve, a water reservoir, a permeable stone, a partition board, a sample chamber, a baffle sheet, a lifting buckle, a fixing box, a water outlet, a measuring cylinder and the like. According to the invention, the baffle thin sheet is inserted in the middle of the sample chamber to separate soil samples on two sides of the sample chamber, the baffle thin sheet is pulled out while the water stop valve is opened, the water stop valve is closed after a period of time t, the baffle thin sheet is inserted again to the original position, and the flow change of sludge particles can be converted by measuring the mass change condition of the soil samples on two sides after a period of time t. The invention can also research the flow condition of soil particles under the conditions of different hydraulic gradients, different pore ratios and different effective stresses by some measures, and fills the gap of the research direction of the flow mechanism of the hydraulic filling sludge. The test scheme is effective and feasible, and the test equipment is simple and easy to operate.

Description

Silt flow tester
Technical Field
The invention relates to the field of geotechnical engineering, in particular to the field of hydraulic reclamation engineering, and particularly relates to a sludge flow tester.
Background
Along with the acceleration of the urbanization process of developed coastal areas, the urban scale is expanded continuously, and the phenomenon of coastal land resource shortage is more obvious. Reclamation of land by sea is also the most direct and effective method for solving the shortage of land resources. With the problems of prohibition of mountain quarrying and shortage of sand sources in rivers and the like by government instructions, other materials have to be considered in engineering to surround sea for land reclamation. In recent years, dredged sludge as a hydraulic filling material has been widely applied to sea reclamation projects, the problem of stacking of dredged sludge is solved, the problem of land reclamation material source is also solved, the cost of project land reclamation is saved, the pollution of sludge throwing and sludge abandoning to the environment is reduced, and the comprehensive benefit is very obvious.
The hydraulic filling sludge, particularly the recent hydraulic filling sludge, has large water content, self-weight consolidation is not completed, and even in a sedimentation stage, the hydraulic filling sludge cannot be directly used as a natural foundation. Therefore, the hydraulic filling sludge must be used after the foundation treatment. The current common dredger fill silt foundation treatment method is mainly a sand cushion-free vacuum preloading foundation treatment method. However, engineering practice shows that after the newly hydraulic-filled silt foundation is reinforced by a sand-free cushion layer vacuum preloading technology, the soil strength is increased in a limited way, the effective reinforcing depth of the foundation is small, and the bearing capacity of the foundation is still low. In the process of vacuumizing, pore water flows, certain flow of dredger fill silt particles also occurs, and some of the dredger fill silt particles even enter the plate core through the filter membrane, so that the permeability coefficient of a soil body around the plastic drainage plate is reduced, and the clogging of the plastic drainage plate is also caused; however, the existing foundation consolidation theory of the vacuum preloading vertical drainage well only uses pore water as a flowing medium, and uses a skeleton formed by soil particles as a deformation medium to study. The method is different from the actual engineering situation, and if the theory is used for consolidation analysis of the hydraulic fill sludge, the method has no great guiding significance, so a set of test equipment for researching the flow mechanism of the hydraulic fill sludge is in urgent need of development.
Disclosure of Invention
The invention provides a sludge flow tester aiming at the blank of the prior art. By using the apparatus we can more deeply understand and understand the mechanism of the flow of the hydraulic fill sludge and its role in consolidation. In order to achieve the above object, the present invention comprises: the device comprises a pressure water head container, a connecting pipe, a water stop valve, a water reservoir, a permeable stone, a partition board, a sample chamber, a baffle sheet, a lifting buckle, a fixing box, a water outlet, a measuring cylinder and the like.
Preferably a sludge flow tester. A baffle sheet is arranged in the middle of a sample chamber, and the upper end and the lower end of the sample chamber are respectively provided with a separation plate and a sealing piston so as to seal a vertical drainage path of a soil sample. And permeable stones with the matched sizes are respectively fixed on the left side and the right side of the sample chamber. The end parts of the permeable stone are respectively provided with a left water storage device and a right water storage device. The right water storage device is provided with a water outlet at the designed height, and a measuring cylinder is arranged below the water outlet to receive water. The left water reservoir is connected with the pressure water head container through a connecting pipe, and a water stop valve is arranged on the connecting pipe to adjust the switch.
Preferably, the baffle sheet is arranged at the middle position of the sample chamber, the peripheral edge of the baffle is tightly abutted with the sample chamber and the isolation plate, and a rubber gasket is arranged for sealing.
Preferably, the baffle sheet is welded with a circular ring-shaped lifting buckle.
The pressure water head container is preferably connected with the water reservoir through a connecting pipe, and pressure water head containers with different sizes can be selected and installed according to test requirements.
Through the technical scheme, the invention has the following beneficial effects:
the invention can be used for studying the flow characteristic of sludge particles under the action of hydraulic gradient by pulling up the baffle sheet after the sample chamber is filled with sludge.
2, the invention can measure the flowing condition of the silt particles under the condition of the same porosity ratio by pouring the same silt soil sample into the soil sample chambers at two sides.
3, the invention can measure the flowing condition of the sludge particles under the condition of different pore ratios by pouring different sludge soil samples into the soil sample chambers at two sides.
4, the invention can change the pressure head difference by selecting and connecting the pressure head containers with different sizes, thereby measuring the flowing condition of the sludge particles under the action of different hydraulic gradients.
5, the invention can measure the flowing condition of the sludge particles under different effective stress conditions by applying load on the upper end of the fixed box.
Drawings
Fig. 1 is a schematic structural view of a sludge flow tester.
Fig. 2 is a top view of a sludge flow tester of the present invention.
In the figure: 1-a pressure head vessel; 2-connecting pipe; 3-a water stop valve; 4-left water reservoir; 5-permeable stone; 6-a separation plate; 7-baffle sheets; 8-fixing the box; 9-lifting the ring buckle; 10-a sample chamber; 11-measuring cylinder; 12-sealing rubber gasket; 13-lower fixing box; 14-right water reservoir; 15-water outlet.
Detailed Description
While a specific embodiment of the present invention will be described in detail, it should be understood that the present invention is not limited to the specific embodiment. Some non-essential adaptations and modifications of the present invention that one skilled in the art can make are within the scope of the present invention.
Referring to fig. 1-2, a silt flow tester comprises a pressure head container 1, the pressure head container 1 is connected and sealed with a left water container 4 through a connecting pipe 2, a water stop valve 3 regulating switch is arranged on a connecting pipe two, a permeable stone 5 with a fitting size is arranged between the left water container 4 and a sample chamber 10, an upper fixing box 8 and a lower fixing box 13 are fixedly arranged at the upper end and the lower end of the sample chamber, the fixing boxes are sealed and isolated with a piston through isolating plates 6, a baffle sheet 7 is arranged in the middle of the sample chamber and can divide the sample chamber into a left closed space and a right closed space with the same size, a circular lifting buckle 9 is welded on the baffle sheet 7, the peripheral edges of the baffle are respectively connected with the side wall of the sample chamber 10 and part of the isolating plates 6 through rubber gaskets 12 in a sealing manner, a right water container 14 is arranged at the right side of the sample chamber 10, and a permeable stone sheet is arranged between the, the water storage 14 is provided with a water outlet 15 at the designed position, and a measuring cylinder 11 is arranged below the water outlet.
The baffle sheet 7 is arranged in the middle of the sample chamber, the peripheral edge of the baffle sheet abuts against the side wall of the sample chamber, and the baffle plate is sealed by a rubber gasket.
The baffle sheet 7 is welded with a circular lifting buckle 9.
The size of the pressure water head container can be selected and connected according to test requirements.
The total size of the sample chamber is 200mm x 400mm, the size of the baffle sheet is 200mm x 10mm, the sizes of the left water storage device and the right water storage device are 200mm x 200mm, the size of the permeable stone on two sides is 200mm x 20mm, and the size of the upper partition plate and the lower partition plate of the sample chamber is 200mm x 5mm x 400 mm.
The sample chamber, the water reservoir, the baffle sheet and the like are all made of metal materials which are not easy to deform.
Based on a silt flow tester, the test step comprises:
1, the test equipment is first installed, the joints are connected and checked for water leakage, the baffle sheet 7 is inserted into the middle of the sample chamber and the water stop valve 3 is closed.
2, preparing a soil sample for test, opening the upper fixed box 8, weighing a sludge sample with equal mass m, and respectively pouring the sludge sample into two sample chambers separated by the baffle sheets 7.
And 3, closing the upper fixing box 8, adding water to the right water storage 14 to the height of the water outlet, adding water to the pressure water head container 1, and opening the water stop valve 3 to keep the water levels of the left and right water storage at the height of the water outlet of the right water storage.
4, closing the water stop valve 3, and placing a measuring cylinder 11 at the water outlet 15 of the right water container 14.
And 5, filling water into the pressure water head container 1 and keeping continuous water head supply, opening the water stop valve 3 and simultaneously drawing the baffle sheet 7 out of the sample chamber through the ring buckle 9, and timing.
And 6, closing the water stop valve 3 after a period of time t, inserting the baffle sheet 7 into the original position again, and reading the water permeability Q measured by the measuring cylinder 11 to obtain the horizontal permeability coefficient of the soil sample through conversion.
And 7, respectively measuring the mass m1 and m2 of soil in the left sample chamber and the right sample chamber of the baffle sheet 7, and converting the mass according to the change of the mass of the sludge soil in the sample chambers at two sides to obtain the flow of the sludge particles.
8, pouring different sludge into the sample chambers at two sides to test so as to study the flowing condition of sludge particles under the conditions of different pore ratios; the flowing condition of sludge particles under different hydraulic gradient conditions can be tested by connecting pressure water head containers 1 with different sizes to change different water head differences; the flow of sludge particles under different effective stresses can be tested by loading the upper end of the fixed box 8, and the test steps are similar to the above steps.

Claims (7)

1. A sludge flow tester, comprising: pressure head container, connecting pipe, stagnant water valve, the reservoir, permeable stone, division board, sample room, baffle thin slice, carry the pulling ring and detain, fixed box, delivery port, graduated flask, its characterized in that: the pressure water head container is connected with the left water container in a sealing way through a connecting pipe, a water stop valve regulating switch is arranged on the connecting pipe, a permeable stone is arranged between the left water container and the sample chamber, an upper fixing box and a lower fixing box are fixedly arranged at the upper end and the lower end of the sample chamber, a baffle sheet is arranged in the middle of the sample chamber, the baffle sheet is square, the sample chamber is divided into a left closed space and a right closed space with the same size, sludge samples with equal mass m are placed in the two sample chambers separated by the baffle sheet, a right water container is arranged at the right side of the sample chamber, a permeable stone sheet is arranged between the right water container and the right water container of the sample chamber, the water levels of the left water container and the right water container are both at the height of the water outlet of the right water container, a measuring cylinder is arranged at the water outlet of the right water container, water is filled into the pressure water head container and continuously supplied with a, and the baffle sheet is inserted into the original position again, the water permeability Q measured by the measuring cylinder is read, the horizontal permeability coefficient of the soil sample is obtained through conversion, the soil mass m1 and the soil mass m2 in the sample chamber on the left side and the sample chamber on the right side of the baffle sheet are respectively measured, and the flow of the sludge particles is obtained through conversion according to the change of the mass of the sludge soil sample in the sample chambers on the two sides.
2. A sludge flow tester as claimed in claim 1, wherein: the baffle slice arranged in the middle of the sample chamber is welded with a circular lifting buckle.
3. A sludge flow tester as claimed in claim 1, wherein: the periphery of the baffle sheet arranged in the middle of the sample chamber is respectively abutted against the side wall, the bottom and the upper isolation plate of the sample chamber, and a rubber pad is arranged to ensure the sealing property of the baffle sheet.
4. A sludge flow tester as claimed in claim 1, wherein: the baffle sheet arranged in the middle of the sample chamber can be positioned, drawn out and inserted.
5. A sludge flow tester as claimed in claim 1, wherein: the sample chamber, the water reservoir and the baffle sheet are all made of metal materials which are not easy to deform.
6. A sludge flow tester as claimed in claim 1, wherein: the pressure head vessel size may vary according to the test requirements.
7. A sludge flow tester as claimed in claim 1, wherein: the upper fixed box is openable and closable.
CN201710290449.XA 2017-04-24 2017-04-24 Silt flow tester Active CN107121360B (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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CN107121360B true CN107121360B (en) 2019-12-20

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CN109859606B (en) * 2019-03-06 2021-05-07 水利部交通运输部国家能源局南京水利科学研究院 Dredge boat mud cabin model
CN113029914B (en) * 2021-04-13 2021-12-03 合肥泛远检测仪器有限公司 Perpendicular permeameter of geotechnique's cloth

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US6298713B1 (en) * 2000-05-10 2001-10-09 Bausch & Lomb Incorporated Method for determination of water transport in biocompatible materials
CN102033034B (en) * 2010-10-29 2012-05-02 四川大学 Soil body horizontal osmotic coefficient measuring apparatus
CN103033460B (en) * 2012-12-26 2015-11-25 上海交通大学 The determinator of soil body horizontal osmotic coefficient and method thereof
CN203672756U (en) * 2013-12-17 2014-06-25 河海大学 Indoor constant head test device for anisotropic soil bidirectional permeability coefficient
CN204142616U (en) * 2014-10-15 2015-02-04 浙江理工大学 A kind of bulky refuse soil permeability coefficient tester
CN204314189U (en) * 2014-12-08 2015-05-06 上海大学 The chamber of a kind of water level controllable type percolation model
CN106353224A (en) * 2016-09-08 2017-01-25 上海工程技术大学 Slurry shielding mud permeation film forming simulation test apparatus

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