CN203132965U - Device for determining permeability coefficient of porous medium material - Google Patents
Device for determining permeability coefficient of porous medium material Download PDFInfo
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- CN203132965U CN203132965U CN 201220735905 CN201220735905U CN203132965U CN 203132965 U CN203132965 U CN 203132965U CN 201220735905 CN201220735905 CN 201220735905 CN 201220735905 U CN201220735905 U CN 201220735905U CN 203132965 U CN203132965 U CN 203132965U
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Abstract
The utility model discloses a device for determining the permeability coefficient of a porous medium material. The device comprises a permeating drum (1) and a water injecting pipe capable of adjusting the water injecting height, wherein the water injecting pipe is communicated with the permeating drum (1) by a communicating pipe (5); an included angle between the communicating pipe (5) and the water injecting pipe is a right angle; and the permeating drum (1), the communicating pipe (5) and the water injecting pipe are H-shaped. The device disclosed by the utility model has the advantages that when a determination experiment of the permeability coefficient is carried out on a sample, water is not directly added into the permeating drum, but is firstly injected into the water injecting pipe, and then is injected into the permeating drum slowly by the communicating pipe according to the principle of a communicating vessel, so that the impact of direct water injection to the sample is reduced and the deformation of the surface of a tested layer is reduced.
Description
Technical field
The utility model relates to a kind of device of measuring the porous media material infiltration coefficient, belongs to building materials checkout equipment technical field.
Background technology
Infiltration coefficient is called hydraulic conductivity again, in isotropic medium, and the specific discharge under its unit's of being defined as hydraulic gradient, the expression fluid is by the complexity of hole skeleton, and in anisotropic medium, infiltration coefficient is represented with tensor form, infiltration coefficient is bigger, and rock permeability is stronger.Infiltration coefficient is an index of combined reaction material penetrating power, and the correct of its numerical value determines that infiltration calculation is had very important meaning.
When underground water permeates in soil body hole, because the effect of osmotic resistance, be accompanied by the loss of energy along Cheng Biran, in order to disclose the infiltration rule of water in the soil body, French hydraulician darcy draws the Darcy's law of reflection water percolation law in the ground hole by a large amount of experimental studies in the period of 1852 to 1855.The device of darcy experiment as shown in Figure 1,10 in the device is that cross-sectional area is the upright cylinder of A, its upper end open is equipped with two at a distance of be the side pressure pipe of l at cylinder side wall, a filter plate 20 is adorned in an above a distance, the end, fills out on the filter plate and puts evengranular sand.Water injects cylinder by the upper end, and unnecessary water overflows from run-down pipe 30, makes the water level in the tube keep a steady state value.The water that penetrates layer of sand flows into the measuring cup 50 from short piece 40, and calculates seepage flow q with this.But intake by the water swivel that is positioned at cylinder top in the above-mentioned experimental provision, in the process of leading water filling of fetching boiling water, the downward impulsive force of water is gone out the spill puddle with the flat surface of filler easily, because the filler of mating formation at ordinary times mostly is flat surface, concave surface causes test inaccurate easily.
For this reason, Chinese patent literature CN201130143Y discloses a kind of porous media material permeability coefficient determinator, this permeability coefficient determinator and darcy permeability experimental facility are basic identical, its difference is, water is by blotter water filling from lower to upper, because the buffer action of rubble has reduced the impact of current to filler.Just above-mentioned instrument only is only applicable to the porous crack, the needs of material osmosis system tests such as the turbid soil with fixed attention of large aperture loose material and macropore, but for fine porosity and the fine and close filler of arrangement, water is when injecting from bottom to top, need higher pressure head, blotter and lower floor's filler are caused bigger impact, and arrange that test sample is big to resistance to water-flow than densification and little the treating of infiltration coefficient, when causing current to treat test sample by dividing plate and blotter arrival easily, hydraulic pressure has not been very even, thereby destroy the structure of layer to be measured, layer thickness to be measured and shape are changed cause the test result error bigger.
The utility model content
Technical problem to be solved in the utility model is osmotic coefficient investigating device of the prior art when measuring fine porosity such as gravel and arranging fine and close filler because the inhomogeneous coarse technical matters of measurement result that makes of hydraulic pressure, and then provides a kind of and be applicable to fine porositys such as measuring gravel and arrange the determinator of the infiltration coefficient of fine and close filler.
For this reason, the technical scheme taked of the utility model is:
A kind of device of measuring the porous media material infiltration coefficient comprises the infiltration tube, also comprises the water injection pipe that can regulate the water filling height, and described water injection pipe was connected with described infiltration tube by communicating pipe.
In the device of said determination porous media material infiltration coefficient, the angle between described communicating pipe and the described water injection pipe is the right angle, and the angle between described communicating pipe and the described infiltration tube is the right angle, and described infiltration tube, described communicating pipe and described water injection pipe are H shape.
In the device of said determination porous media material infiltration coefficient, described water injection pipe comprises mobile water pipe and fixing water pipe, and described mobile water pipe is arranged on the inside of described fixedly water pipe, and described mobile water pipe is connected with fixedly water pipe is removable.
In the device of said determination porous media material infiltration coefficient, the sidewall of described water injection pipe is provided with some overflow vents, and described overflow vent is provided with for the valve of opening or closing described overflow vent.
In the device of said determination porous media material infiltration coefficient, described infiltration tube bottom is provided with the porous base.
In the device of said determination porous media material infiltration coefficient, described porous base bottom is provided with header tank.
In the device of said determination porous media material infiltration coefficient, described header tank bottom is provided with water delivering orifice.
In the device of said determination porous media material infiltration coefficient, described water injection pipe is arranged in the reserve tank, is provided with submersible pump in the described reserve tank, and described submersible pump is connected with to the water service pipe of water injection pipe water filling.
In the device of said determination porous media material infiltration coefficient, described porous media material is silica sand or precoated sand.
Compared with prior art, the utlity model has following advantage:
1, the device of mensuration porous media material infiltration coefficient of the present utility model, except the infiltration tube, also comprise the water injection pipe that to regulate the water filling height, and described water injection pipe was connected with described infiltration tube by communicating pipe, when sample is carried out the determination experiment of infiltration coefficient, water is not directly to add in the infiltration tube, but injects water injection pipe earlier, again by utilize communicating pipe law of connected vessels slowly to the water filling of infiltration tube, reduce direct water filling to the impact of sample, reduced the distortion on test layer surface.
2, the device of mensuration porous media material infiltration coefficient of the present utility model, described infiltration tube, described communicating pipe and described water injection pipe are H shape, angle between described communicating pipe and described water injection pipe and the described infiltration tube is the right angle, the water surface of water injection pipe is flushed with the water surface of infiltration tube, and then reduce to permeate the waterflood injection rate of tube.
3, the device of mensuration porous media material infiltration coefficient of the present utility model, the water filling adjustable height of water injection pipe when carrying out sample determination, can be tested sample under a plurality of hydraulic pressure, guarantees the accuracy of measurement result.
4, the device of mensuration porous media material infiltration coefficient of the present utility model is particularly useful for measuring arrangements densifications such as silica sand, precoated sand, ventilative antiseepage sand, does not have obvious hole, infiltration coefficient materials with smaller.
5, the device of mensuration porous media material infiltration coefficient of the present utility model, the xsect of its header tank is trapezoidal, can firmly support the infiltration tube.
Description of drawings
Content of the present utility model is easier clearly to be understood in order to make, and according to specific embodiment of the utility model also by reference to the accompanying drawings, the utility model is described in further detail, wherein below
Fig. 1, be the structural representation of darcy permeability experimental facility;
Fig. 2, be the structural representation of embodiment 1 described osmotic coefficient investigating device.
Fig. 3, be the structural representation of embodiment 2 described osmotic coefficient investigating devices.
Wherein, Reference numeral is expressed as:
1-permeates tube, 2-porous base, and the 3-header tank, 4-is water pipe fixedly, and 5-communicating pipe, 6-moves water pipe, 7-submersible pump, 8-water service pipe, 9-reserve tank, 11-specimen layer, 12-overflow vent, 13-water delivering orifice.
Embodiment
Embodiment 1
A kind of device of measuring the porous media material infiltration coefficient as shown in Figure 2 comprises infiltration tube 1 and can regulate water filling water injection pipe highly, and described water injection pipe was connected with described infiltration tube 1 by communicating pipe 5.Wherein, the angle between described communicating pipe 5 and the described water injection pipe is the right angle, and the angle between described communicating pipe 5 and the described infiltration tube 1 is the right angle, and described infiltration tube 1, described communicating pipe 5 are H shape with described water injection pipe.
The described water injection pipe of regulating water filling height comprises mobile water pipe 6 and fixing water pipe 4 in the present embodiment, and described mobile water pipe 6 is arranged on the inside of described fixedly water pipe 4, and described mobile water pipe 6 is tightly connected movably with fixing water pipe 4.In experimentation, the height by regulating mobile water pipe to be determining the water filling height of water injection pipe, and then determines different hydraulic pressure.Described infiltration tube 1 bottom is provided with porous base 2.And described porous base bottom is provided with header tank 3.
Be using water wisely, the described proving installation of present embodiment can also arrange special-purpose reserve tank, and wherein said water injection pipe is arranged in the reserve tank 9, is provided with submersible pump 7 in the described reserve tank 9, and described submersible pump 7 is connected with the water service pipe 8 to the water injection pipe water filling.
When adopting the described determinator of present embodiment that the infiltration coefficient of precoated sand is measured, its concrete operations step is:
A) be that the infiltration tube inwall of A is slowly poured into water along cross-sectional area, abundant wetting inwall wall and porous base are got a certain amount of sand sample to be measured and are poured in the infiltration tube, and jolt ramming 5-6 time makes that sand sample thickness is d centimetre after the jolt ramming;
B) regulate the height of mobile water pipe, make the water colunm height in the hydrostatic column reach test height h, add the water of q.s in the bucket, start submersible pump and in mobile water pipe, add water;
C) when liquid level arrives communicating pipe and continues water inlet, water is by flow in the infiltration tube communicating pipe, and liquid level begins to rise in the infiltration tube, after liquid level arrives communicating pipe in the infiltration tube, the infiltration tube slowly rises simultaneously with the liquid level of water injection pipe, constantly to mobile water pipe water filling, when the liquid level in the mobile water pipe arrived the top, reserve tank was gone in the continuous overflow of water, at this moment, mobile water pipe flushes with liquid level in the infiltration tube, continues to mobile water pipe water filling, keeps infiltration tube liquid level constant;
D) when water at the uniform velocity flows out from the porous base, header tank is placed below the porous base, begin to collect percolating water, pick up counting simultaneously;
E) behind the elapsed time t water of collecting in the header tank is poured in the graduated cylinder, obtained the volume V. of percolating water in the t time
Infiltration coefficient calculates by formula:
k=Vd/(tAP)
In the formula:
K---infiltration coefficient, unit are centimeters per second (cm/s);
T---collect the minute of moisture, unit is second (s);
Seepage flow in V---the t time, unit are cubic centimetre (cm
3);
The thickness of d---sample, unit are (cm);
The seepage flow cross-sectional area of A---sample, unit are square centimeter (cm
2);
The hydraulic pressure that Δ P---sample is subjected to, in the high h of water column, unit is centimetre (cm);
The coefficient of viscosity ratio of η---water, η=η
T/ η
20=1.762/ (1+0.0337T+0.00022T
2),
Wherein: η
T---the test water temperature T (℃) time water the coefficient of viscosity, unit is a kPa second (kPas);
η
20---the coefficient of viscosity of water during 20 ℃ of water temperatures, unit are a kPa second (kPas)
T---test water temperature, unit be degree centigrade (℃).
By regulating the height of mobile water pipe, measure the infiltration coefficient under 3 different water colunm heights, average as a result of.
Embodiment 2
Fig. 3 is that its structure of device of the described mensuration porous media material of present embodiment infiltration coefficient is substantially the same manner as Example 2, its difference is, the sidewall of described water injection pipe is provided with 3 overflow vents 12, described overflow vent 12 is provided with for the valve of opening or closing described overflow vent 12, in addition, described header tank 3 bottoms are provided with water delivering orifice 13.When sample is tested, open or close corresponding valve by regulating, guarantee that the water surface in the water injection pipe is positioned at different height, and then obtain different hydraulic pressure, guarantee the accuracy of test, in addition, header tank directly is arranged under the infiltration case before test, and guarantees that water delivering orifice is opening, when treating that water at the uniform velocity flows out from the porous base, close water delivering orifice and collect percolating water, behind the time t, Open valve is measured the volume V of percolating water.
Obviously, above-described embodiment only is for example clearly is described, and is not the restriction to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here need not also can't give all embodiments exhaustive.And the apparent variation of being extended out thus or change still are among the protection domain of the utility model creation.
Claims (9)
1. a device of measuring the porous media material infiltration coefficient comprises infiltration tube (1), it is characterized in that,
Also comprise the water injection pipe that can regulate the water filling height, described water injection pipe was connected with described infiltration tube (1) by communicating pipe (5).
2. the device of mensuration porous media material infiltration coefficient according to claim 1 is characterized in that,
Angle between described communicating pipe (5) and the described water injection pipe is the right angle, and the angle between described communicating pipe (5) and the described infiltration tube (1) is the right angle, and described infiltration tube (1), described communicating pipe (5) are H shape with described water injection pipe.
3. the device of mensuration porous media material infiltration coefficient according to claim 2 is characterized in that,
Described water injection pipe comprises mobile water pipe (6) and fixing water pipe (4), and described mobile water pipe (6) is arranged on the inside of described fixedly water pipe (4), and described mobile water pipe (6) and fixing removable connection of water pipe (4).
4. the device of mensuration porous media material infiltration coefficient according to claim 2 is characterized in that,
The sidewall of described water injection pipe is provided with some overflow vents (12), and described overflow vent (12) is provided with for the valve of opening or closing described overflow vent (12).
5. according to the device of claim 3 or 4 described mensuration porous media material infiltration coefficients, it is characterized in that,
Described infiltration tube (1) bottom is provided with porous base (2).
6. the device of mensuration porous media material infiltration coefficient according to claim 5 is characterized in that,
Described porous base bottom is provided with header tank (3).
7. the device of mensuration porous media material infiltration coefficient according to claim 6 is characterized in that,
Described header tank (3) bottom is provided with water delivering orifice (13).
8. the device of mensuration porous media material infiltration coefficient according to claim 7 is characterized in that,
Described water injection pipe is arranged in the reserve tank (9), is provided with submersible pump (7) in the described reserve tank (9), and described submersible pump (7) is connected with the water service pipe (8) to the water injection pipe water filling.
9. the device of mensuration porous media material infiltration coefficient according to claim 8 is characterized in that,
Described porous media material is silica sand or precoated sand.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220735905 CN203132965U (en) | 2012-12-28 | 2012-12-28 | Device for determining permeability coefficient of porous medium material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220735905 CN203132965U (en) | 2012-12-28 | 2012-12-28 | Device for determining permeability coefficient of porous medium material |
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| CN203132965U true CN203132965U (en) | 2013-08-14 |
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| CN 201220735905 Expired - Lifetime CN203132965U (en) | 2012-12-28 | 2012-12-28 | Device for determining permeability coefficient of porous medium material |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105259090A (en) * | 2015-11-04 | 2016-01-20 | 天津理工大学 | Soil infiltrometer |
| CN106885764A (en) * | 2015-12-16 | 2017-06-23 | 北京银河巴马生物技术股份有限公司 | A kind of biomembrane anti-permeability detection means and application |
| CN108645776A (en) * | 2018-05-14 | 2018-10-12 | 河海大学 | A kind of seepage flow test device and method using conductivity measurement medium osmosis coefficient |
| CN111359445A (en) * | 2020-03-09 | 2020-07-03 | 武汉理工大学 | Measure device of film water permeability |
-
2012
- 2012-12-28 CN CN 201220735905 patent/CN203132965U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105259090A (en) * | 2015-11-04 | 2016-01-20 | 天津理工大学 | Soil infiltrometer |
| CN105259090B (en) * | 2015-11-04 | 2018-05-08 | 天津理工大学 | Soil infiltration instrument |
| CN106885764A (en) * | 2015-12-16 | 2017-06-23 | 北京银河巴马生物技术股份有限公司 | A kind of biomembrane anti-permeability detection means and application |
| CN106885764B (en) * | 2015-12-16 | 2019-08-27 | 北京银河巴马生物技术股份有限公司 | A kind of biomembrane anti-permeability detection device and application |
| CN108645776A (en) * | 2018-05-14 | 2018-10-12 | 河海大学 | A kind of seepage flow test device and method using conductivity measurement medium osmosis coefficient |
| CN111359445A (en) * | 2020-03-09 | 2020-07-03 | 武汉理工大学 | Measure device of film water permeability |
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| GR01 | Patent grant | ||
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| CX01 | Expiry of patent term |
Granted publication date: 20130814 |