CN110530770A - A kind of sandy soil porosity testing device and method - Google Patents
A kind of sandy soil porosity testing device and method Download PDFInfo
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- CN110530770A CN110530770A CN201910764851.6A CN201910764851A CN110530770A CN 110530770 A CN110530770 A CN 110530770A CN 201910764851 A CN201910764851 A CN 201910764851A CN 110530770 A CN110530770 A CN 110530770A
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- China
- Prior art keywords
- sandy soil
- water storage
- storage cylinder
- sample
- sample storehouse
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
- G01N15/0893—Investigating volume, surface area, size or distribution of pores; Porosimetry by measuring weight or volume of sorbed fluid, e.g. B.E.T. method
Abstract
A kind of sandy soil porosity testing device of the present invention and method, belong to rock-soil mechanics experimental field；Rock And Soil is nature body, and the variation of internal ground physico mechanical characteristic is difficult to accurately predict, and experimental determination program is cumbersome, requires laboratory technician high to limit the popularization of on-the-spot test；The present invention provides a kind of sandy soil porosity testing device and method, and the water variation in water storage cylinder that the sandy soil for being placed in sample storehouse pass through connection sample storehouse obtains the pore volume of sandy soil, and sandy soil porosity is calculated according to porosity formula；Operation of the present invention is convenient, apparatus structure is simple, assembly is easy, test method step is simple, controls gas pressure in water butt by adjusting high pressure gas holder valve, achievees the purpose that test sandy soil porosity, low to environmental requirement and easy implementation, the scene of overcoming is difficult to the problem of measuring sandy soil porosity, practical, convenient for promoting the use of.
Description
Technical field
The present invention relates to rock-soil mechanics experimental field, specially a kind of Novel sand soil pores rate test device and test side
Method.
Background technique
As the more and more geotechnical engineerings of the rapid development of China's capital construction are being carried out, the physics of ground in geotechnical engineering
Mechanical characteristic is the basic foundation of design and construction.Rock-soil material is multi phase porous medium, how quickly and effectively to measure ground
Physico mechanical characteristic for instructing geotechnical engineering project implementation to play a significant role.As sandy soil have, porosity is big, stablizes
Property it is poor the features such as, underground water can usually flow in the sand, bring ground construct in drift sand be difficult to control the problems such as, cause wealth
Produce loss and casualties.
It is husky although being had conducted extensive research in the world to the stability of sandy soil stability problem and underground water and geotechnical engineering
The porosity test technology also comparative maturity of soil, but Rock And Soil is nature body, and internal ground physico mechanical characteristic variation is difficult to essence
Really prediction, and experimental determination program is cumbersome, requires laboratory technician high to limit the popularization of on-the-spot test.Therefore, one is found
The sandy soil porosity test method of kind simple and effective has very strong practical value.
Summary of the invention
The present invention is directed to overcome the prior art, a kind of Novel sand soil pores rate test device and test side are provided
Method, to determine the porosity of live sandy soil.
A kind of Novel sand soil pores rate test device, including sandy soil sample loading device and high pressure gas holder；Sandy soil sample adds
It carries and sets including sample storehouse and water storage cylinder, sample storehouse and water storage cylinder are mounted on the base, and sample storehouse lower part and water storage cylinder lower part are logical
Connecting pipe connection is crossed, connecting pipe and sample storehouse junction are equipped with filter disc, and connecting pipe is equipped with water flow close to sample storehouse side
Control valve；Water storage cylinder top is equipped with relief tube and air inlet mouth of pipe, and relief tube is equipped with relief valve, and air inlet mouth of pipe is soft by air pressure
Pipe is connected with high pressure gas holder.
Further, water storage cover is housed at the top of water storage cylinder.
Further, sample storehouse is identical with capacity with the height of water storage cylinder, and scale is arranged in sample storehouse and water storage cylinder.
A kind of sandy soil porosity test method, comprising the following steps:
Sandy soil are put into drying box and dry 4 hours or more, the sandy soil sample of drying is placed in sample storehouse by the first step, husky
Soil sample height is 2 ~ 2.5 times of sample storehouse internal diameter, and sandy soil specimen surface is smooth.
Second step closes flow cavitation result valve and relief valve, and the water filling in water storage cylinder is until liquid level and sandy soil volume of sample
Scale V0It is identical, flow cavitation result valve is opened, the water in water storage cylinder is made to slowly penetrate sample storehouse by connecting pipe.
Third step, stable level covers tightly water storage cover after five minutes in water storage cylinder, slowly unscrews the air pressure valve of high pressure gas holder
Door, gas enter water storage cylinder by air hose, close air pressure valve when sandy soil sample top surface is flooded and there is not in sample storehouse.
4th step, by the slow pressure release of relief valve until the upper surface of liquid level and sandy soil sample in sample storehouse is in same water
Plane closes relief valve, and records water surface scale V in water storage cylinder at this time1, utilize porosity formula n=(V0-V1)/V0It calculates husky
The porosity of soil sample.
In conclusion invention has the advantages that
For the present invention using capacity and the identical sample storehouse of height and water storage cylinder, sandy soil sample and water control are intuitive as it can be seen that water storage
Air pressure is controlled by relief valve and high pressure gas holder in cylinder, and easy to operate, apparatus structure is simple, and assembly is easy, the step of test method
Rapid simple, the present invention is low to environmental requirement and easy implementation, and the scene of overcoming is difficult to the problem of measuring sandy soil porosity, practicability
By force, convenient for popularization and use.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of Novel sand soil pores rate test device of the present invention.
In figure: 1- pedestal, 2- sample storehouse, 3- water storage cylinder, 4- connecting pipe, 5- flow cavitation result valve, 6- water storage cover, 7-
Air inlet mouth of pipe, 8- relief tube, 9- relief valve, 10- filter disc, 11- high pressure gas holder, 12- air pressure valve, 13- air hose, 14- are husky
Soil sample, 15- water.
Specific embodiment
The following are the contents of the present invention, feature and effect is further illustrated, the present invention is made referring to drawings and examples detailed
It describes in detail bright.
The present invention provides a kind of Novel sand soil pores rate test devices, including sandy soil sample loading device as shown in Figure 1:
With high pressure gas holder 11, in which: sandy soil sample loading device includes pedestal 1, sample storehouse 2 and water storage cylinder 3, sample storehouse 2 and water storage cylinder 3
It is installed on pedestal 1, it is ensured that sandy soil sample loading device held stationary in use, the height in sample storehouse 2 and water storage cylinder 3
It is identical with capacity, scale is set in sample storehouse 2 and water storage cylinder 3, convenient for the control of sandy soil sample 14 and water, volumetric errors are small,
2 lower part of sample storehouse is connected to 3 lower part of water storage cylinder by connecting pipe 4, and water storage cylinder 3 is for pressurizeing to sample storehouse 2 in test process
Pressure release, connecting pipe 4 and 2 junction of sample storehouse are equipped with filter disc 10, and sandstone sample 14 is during the test without going past connecting tube
Road 4 enters in water storage cylinder 3, and connecting pipe 4 is equipped with flow cavitation result valve 5 close to 2 side of sample storehouse, and flow cavitation result valve 5 is storing up
It is remained off in 3 the injecting process of water drum；3 top of water storage cylinder is equipped with relief tube 8 and air inlet mouth of pipe 7, and relief tube 8 is equipped with and lets out
Pressure valve 9, air inlet mouth of pipe 7 are connect by air hose 13 with high pressure gas holder 11；Water storage cover 6 is housed, in water storage at the top of water storage cylinder 3
Start in pressurization and pressure leak process after the completion of 3 water filling of cylinder, holding water storage cylinder 3 is closed environment, and air pressure is not by atmospheric pressure in cylinder
It influences, tests more accurate.
A kind of sandy soil porosity test method, comprising the following steps:
Sandy soil are put into drying box and dry 4 hours or more, the sandy soil sample 14 of drying is placed in sample storehouse 2 by the first step,
14 height of sandy soil sample is 2 ~ 2.5 times of 2 internal diameter of sample storehouse, it is ensured that water flows in the sand will not destroy sandy soil structure, and not
The too many time can be expended, 14 surfacing of sandy soil sample, the volume of sandy soil sample 14 is denoted as V0。
Second step closes flow cavitation result valve 5 and relief valve 9, and the water filling in water storage cylinder 3 is until liquid level and sandy soil sample 14
Volume V0It is identical, flow cavitation result valve 5 is opened, the water in water storage cylinder 3 is made to slowly penetrate sample storehouse 2 by connecting pipe 4.
Third step, stable level after five minutes, covers tightly water storage cover 6 in water storage cylinder 3, slowly unscrews the gas of high pressure gas holder 11
Pressure valve 12 avoids too fast pressurization that water in water storage cylinder 3 is caused to be overflowed by gas shock from sample storehouse 2, and gas passes through air pressure
Hose 13 enters water storage cylinder 3, and air pressure valve 12 is closed when 14 top surface of sandy soil sample in sample storehouse 2 is flooded and there is not.
4th step, by the slow pressure release of relief valve 9 until the upper surface of liquid level and sandy soil sample 14 in sample storehouse 2 is same
One horizontal plane closes relief valve 9, and records water surface scale V in water storage cylinder 3 at this time1, the water volume differences in water storage cylinder 3 are
The pore volume of sandy soil sample 14 in sample storehouse 2 utilizes porosity formula n=(V0-V1)/V0Calculate the hole of sandy soil sample 14
Rate.
It should be pointed out that for the those skilled in the art of the art, without departing from the principle of the present invention,
Several improvement and application can also be made, these are improved and application is also considered as protection scope of the present invention.
Claims (5)
1. a kind of sandy soil porosity testing device, it is characterised in that: including sandy soil sample loading device and high pressure gas holder (11),
In:
The sandy soil sample loading device includes sample storehouse (2) and water storage cylinder (3), and the sample storehouse (2) and water storage cylinder (3) are installed
In on pedestal (1), sample storehouse (2) lower part is connected to water storage cylinder (3) lower part by connecting pipe (4), connecting pipe (4) and sample
Storehouse (2) junction is equipped with filter disc (10), and connecting pipe (4) is equipped with flow cavitation result valve (5) close to sample storehouse (2) side；It is described
Water storage cylinder (3) top is equipped with relief tube (8) and air inlet mouth of pipe (7), and relief tube (8) is equipped with relief valve (9), air inlet mouth of pipe (7)
It is connected by air hose (13) and high pressure gas holder (11).
2. sandy soil porosity testing device according to claim 1, it is characterised in that: be equipped at the top of the water storage cylinder (3)
Water storage cover (6).
3. sandy soil porosity testing device according to claim 1, it is characterised in that: the sample storehouse (2) and water storage cylinder
(3) height is identical with capacity.
4. sandy soil porosity testing device according to claim 3, it is characterised in that: the sample storehouse (2) and water storage cylinder
(3) scale is set on.
5. a kind of sandy soil porosity test method, it is characterised in that: the following steps are included:
Sandy soil are put into drying box and dry 4 hours or more by the first step, and the sandy soil sample (14) of drying is placed in sample storehouse
(2) in, sandy soil sample (14) is highly 2 ~ 2.5 times of sample storehouse (2) internal diameter, sandy soil sample (14) surfacing；
Second step closes flow cavitation result valve (5) and relief valve (9), and the water filling in water storage cylinder (3) is until liquid level and sandy soil sample
(14) volume markings V0It is identical, it opens flow cavitation result valve (5), seeps the water in water storage cylinder (3) slowly by connecting pipe (4)
Enter sample storehouse (2)；
Third step, water storage cylinder (3) interior stable level cover tightly water storage cover (6) after five minutes, slowly unscrew the gas of high pressure gas holder (11)
Pressure valve (12), gas enters water storage cylinder (3) by air hose (13), to sample storehouse (2) interior sandy soil sample (14) top surface quilt
Air pressure valve (12) are closed when water submerged；
4th step, by the slow pressure release of relief valve (9) until the upper surface of liquid level and sandy soil sample (14) in sample storehouse (2) exists
Same level is closed relief valve (9), and records the interior water surface scale V of water storage cylinder (3) at this time1, utilize porosity formula n=(V0-
V1)/V0Calculate the porosity of sandy soil sample (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910764851.6A CN110530770A (en) | 2019-08-19 | 2019-08-19 | A kind of sandy soil porosity testing device and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910764851.6A CN110530770A (en) | 2019-08-19 | 2019-08-19 | A kind of sandy soil porosity testing device and method |
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| CN110530770A true CN110530770A (en) | 2019-12-03 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102359930A (en) * | 2011-09-19 | 2012-02-22 | 西安公路养护技术工程研究中心有限公司 | Test method for porosity of asphalt mixture, and apparatus thereof |
| CN104677803A (en) * | 2015-03-12 | 2015-06-03 | 河南理工大学 | Constant and variable head composite penetration testing device |
| CN106442259A (en) * | 2016-09-22 | 2017-02-22 | 中南林业科技大学 | Method and device for rapidly determining effective porosity of ecological porous concrete |
| CN206504983U (en) * | 2016-12-20 | 2017-09-19 | 河海大学 | A kind of easy device for measuring effective porosity of permeable concrete |
| CN107560992A (en) * | 2017-08-16 | 2018-01-09 | 北京城建勘测设计研究院有限责任公司 | A kind of easy coarse granule porosity measurement technique |
-
2019
- 2019-08-19 CN CN201910764851.6A patent/CN110530770A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102359930A (en) * | 2011-09-19 | 2012-02-22 | 西安公路养护技术工程研究中心有限公司 | Test method for porosity of asphalt mixture, and apparatus thereof |
| CN104677803A (en) * | 2015-03-12 | 2015-06-03 | 河南理工大学 | Constant and variable head composite penetration testing device |
| CN106442259A (en) * | 2016-09-22 | 2017-02-22 | 中南林业科技大学 | Method and device for rapidly determining effective porosity of ecological porous concrete |
| CN206504983U (en) * | 2016-12-20 | 2017-09-19 | 河海大学 | A kind of easy device for measuring effective porosity of permeable concrete |
| CN107560992A (en) * | 2017-08-16 | 2018-01-09 | 北京城建勘测设计研究院有限责任公司 | A kind of easy coarse granule porosity measurement technique |
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Application publication date: 20191203 |