CN109610562B - Method for collecting water generated by pot cover effect - Google Patents
Method for collecting water generated by pot cover effect Download PDFInfo
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- CN109610562B CN109610562B CN201811555384.8A CN201811555384A CN109610562B CN 109610562 B CN109610562 B CN 109610562B CN 201811555384 A CN201811555384 A CN 201811555384A CN 109610562 B CN109610562 B CN 109610562B
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B3/00—Methods or installations for obtaining or collecting drinking water or tap water
- E03B3/28—Methods or installations for obtaining or collecting drinking water or tap water from humid air
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Abstract
The invention provides a method for collecting water generated by pot cover effect, which can collect water generated by condensation and desublimation of pot cover effect under a covering layer. According to the invention, the interface of the clay layer and the rubble layer is laid into an inclined plane, the gradient of the inclined plane is 1/6, the bottom end of the inclined plane is provided with a water-gathering blind ditch, the water outlet is positioned at the blind ditch, a constant water level which is 5mm lower than the water outlet is provided for the clay layer during a test, water in soil is upwards migrated in a gaseous state under the action of a temperature gradient, is condensed or desublimated in the rubble layer, and water generated by condensation and desublimated after temperature rise is collected in the blind ditch through the inclined plane and is collected through the water outlet. The method can obtain water generated by the pot cover effect in clay and obtain water quantity, and has important significance for researching engineering diseases caused by the pot cover effect and preventing and controlling the engineering diseases.
Description
Technical Field
The invention relates to a method for collecting water generated by pan cover effect, which can collect water generated by pan cover effect condensation and desublimation under a covering layer. Belongs to the technical field of unsaturated soil water migration in geotechnical engineering.
Background
The Shenyangtao immortal international airport is built for less than 30 years, and a large number of engineering diseases such as frost heaving cracks, road surface swelling and water yielding of roadbed rubble layers appear on airport runways. The airport is in a drought and cold area, the underground water level is deep, and good conditions are provided for the formation of a 'pot cover effect'. In winter, water vapor in soil migrates upwards under the action of temperature gradient and condenses or desublimates in a low-temperature area below the pavement covering layer, so that water under the covering layer is accumulated, and a pot cover effect is formed. In actual engineering, the accumulation of soil moisture under the pavement is an important factor causing disaster on the pavement.
The Chinese patent with the application number of 201710164663.0 discloses a pot cover effect tester, which comprises a soil sample container part, an upper temperature control part, a lower temperature control and water supplement part and a temperature and moisture content monitoring part. This tester can control soil sample top bottom temperature, can supply gaseous state water for soil sample, but can not collect the moisture that the pot cover effect generated. The existing method analyzes and calculates the water amount generated by the pot cover effect through the change of the water content of the soil body or the quantity of water supplement, and cannot directly measure or obtain the water amount.
Disclosure of Invention
It is an object of the present invention to overcome the disadvantages of the prior art by providing a method of collecting cover effect produced water that collects cover effect condensation and desublimation produced water under the cover layer and measures the amount of water collected.
The technical scheme adopted by the invention is as follows:
a method for collecting water generated by pot cover effect relates to a pot cover effect test and can obtain water generated by condensation and desublimation, and a Chinese patent with application number of 201710164663.0 relates to a pot cover effect test instrument, and a water collecting part is added on the original basis through upgrading and developing the test instrument. The method is characterized in that: the water collecting part comprises a water outlet arranged on the side wall of the test tube and a water collecting cup connected with the water outlet; filling clay into the test cylinder, wherein a rubble layer is arranged on the clay layer, the interface of the clay layer and the rubble layer is a smooth inclined plane, the gradient of the inclined plane is 1/6, a rubble blind ditch is reserved at the bottom end of the inclined plane, and the rubble blind ditch is positioned at the water outlet.
And the water outlet is used for enabling condensed water and water generated by desublimation to flow out of the test cylinder when the temperature is reduced and the water is melted. The water outlet is provided with a valve which is used for controlling the water outlet to be closed when the temperature is reduced and frozen and to be opened when the temperature is increased and melted.
And the clay layer is provided with a constant water level which is 5mm at the lower end of the water outlet.
The advantages and the beneficial effects of the invention are as follows:
1. the side wall of the test tube is provided with the water outlet, so that water generated by the pot cover effect can be taken out.
2. The invention can collect and measure the water generated by the pot cover effect.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
The invention will be further explained with reference to the drawings, in which:
the invention relates to a method for collecting water generated by a pot cover effect, which comprises the following steps: lay the clay layer with rubble layer interface and become the inclined plane that the slope is 1/6, the inclined plane bottom sets up one and gathers water french drain, the delivery port is located french drain department, provides the invariable water level that is less than 5mm under the delivery port for the clay layer during the experiment, and water in the soil upwards migrates with gaseous form under the temperature gradient effect, freezes into ice or condensate water at the rubble layer, and the cooling melts the back, and water collects the french drain through the inclined plane, collects through the delivery port.
The test method is as follows:
a. filling test clay into a test cylinder 13, filling and compacting in layers, when the filling height of a soil sample reaches a water outlet 9, paving the upper surface of a clay layer 2 into a smooth inclined plane 5, wherein the slope of the inclined plane is 1/6, the bottom end of the inclined plane 5 is parallel and level to the upper end of the water outlet 9, the clay simulates foundation soil of an actual airport runway, the inclined plane of the clay simulates a water scattering structure with a high middle part and low two ends of the runway, a blind ditch 12 is reserved at the water outlet 9, and the blind ditch 12 is filled with broken stones.
b. And after the clay layer 2 is filled, filling broken stones on the clay layer 2. The broken stone simulates a broken stone cushion layer below the actual airport pavement, and a temperature-guiding disc 14 is placed on the broken stone layer 6 for temperature control.
c. The Ma bottle 7 starts to replenish water for the constant water level of the clay layer 2 through the water storage chamber 8, the water level is set to be 5mm below the water outlet, and the water level 3 through the water level meter 1 can reflect the water level 4 of the clay layer.
d. And starting to cool and freeze. In the cooling process, water in the clay layer 2 is transferred to the gravel layer 6 in a gaseous state under the action of temperature gradient, and the upper temperature-conducting disc 14 and the gravel are condensed or desublimed when meeting low temperature.
e. And after the temperature is reduced, stopping the water supplement of the Mariotte bottle 7, opening the valve 11 of the water outlet 9 and starting to increase the temperature. The ice layer frozen on the crushed stone layer 6 begins to melt into water, and because the clay layer 2 basically reaches saturation after long-time water supplement and moisture migration, the clay layer 2 basically does not absorb condensed water and water melted by ice any more, but flows to the crushed stone blind ditch 12 through the boundary inclined plane 5 and then flows to the water collecting cup 10 through the water outlet 9 for collection.
Claims (3)
1. A method for collecting water generated by pot cover effect relates to a pot cover effect test and can obtain water generated by condensation and desublimation, and relates to a pot cover effect test instrument, which comprises a soil sample container part, an upper temperature control part and a lower temperature control water replenishing part;
the soil sample container part comprises a test cylinder and a porous plate at the bottom of the test cylinder;
the upper temperature control part comprises an upper temperature guide disc and a first constant temperature groove communicated with the upper temperature guide disc, and the upper temperature guide disc covers the top of the soil sample container part;
the lower temperature-control water supply part comprises a water storage chamber and a second thermostatic bath, wherein the water storage chamber is composed of a side wall and a lower temperature conducting disc at the bottom, the second thermostatic bath is communicated with the lower temperature conducting disc, and a porous plate at the bottom of the test tube is arranged at the top of the water storage chamber; the upper part of the side wall is provided with a water injection pipe which injects water into the water storage chamber during the test;
during the test, the upper temperature guide disc transmits heat from the first constant temperature groove to the upper surface of the soil sample, the lower temperature guide disc transmits heat from the second constant temperature groove to water in the water storage chamber, the water in the water storage chamber is evaporated into water vapor during the test, the water vapor passes through the porous plate to be supplemented into the soil sample, and the temperature is transmitted to the lower surface of the soil sample;
a water collecting part is added on the basis of the tester;
the method is characterized in that: the water collecting part comprises a water outlet (9) arranged on the side wall of the test cylinder (13) and a water collecting cup (10) connected with the water outlet (9); filling clay in a test tube (13), wherein a clay layer (2) is provided with a constant water level (4), a rubble layer (6) is arranged on the clay layer (2), the interface of the clay layer (2) and the rubble layer (6) is a smooth inclined plane (5), the gradient of the inclined plane (5) is 1/6, a rubble blind ditch (12) is reserved at the bottom end of the inclined plane (5), and the rubble blind ditch (12) is positioned at a water outlet (9).
2. The method of claim 1, wherein: and the water outlet (9) is used for cooling and melting condensed water and water generated by desublimation to flow out of the test cylinder (13), a valve (11) is installed on the water outlet (9), the valve (11) is used for controlling the water outlet (9) to be closed when being cooled and frozen, and the valve is opened when being heated and melted.
3. The method of claim 1, wherein: the constant water level (4) is 5mm at the lower end of the water outlet (9).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811555384.8A CN109610562B (en) | 2018-12-19 | 2018-12-19 | Method for collecting water generated by pot cover effect |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811555384.8A CN109610562B (en) | 2018-12-19 | 2018-12-19 | Method for collecting water generated by pot cover effect |
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| CN109610562A CN109610562A (en) | 2019-04-12 |
| CN109610562B true CN109610562B (en) | 2020-09-22 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110108861B (en) * | 2019-05-30 | 2022-02-15 | 西北农林科技大学 | Indoor model test device for researching channel-based natural auxiliary heating rod |
| CN114892759B (en) * | 2022-02-25 | 2023-03-21 | 北京航空航天大学 | Desert shallow water storage technology utilizing pot cover effect |
| CN115653820B (en) * | 2022-10-25 | 2024-06-11 | 北京航空航天大学 | Power generation method utilizing pot cover effect |
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| CN101979766B (en) * | 2010-10-21 | 2012-07-11 | 中铁第四勘察设计院集团有限公司 | Subgrade bed structure of high-speed railway red clay cutting |
| WO2013039098A1 (en) * | 2011-09-16 | 2013-03-21 | Hishida Iwao | Method and apparatus for obtaining water from air |
| CN202330232U (en) * | 2011-11-15 | 2012-07-11 | 山东大学 | Device for testing permeability coefficient of pervious concrete |
| CN105064158B (en) * | 2015-07-08 | 2017-05-24 | 北京航空航天大学 | Prevention method for disasters caused by "pot effect" of airport runway |
| CN105088911B (en) * | 2015-07-29 | 2017-06-30 | 北京航空航天大学 | One kind preventing and treating " pot cover effect " causes the new road based structures of disaster |
| CN107063933A (en) * | 2017-03-20 | 2017-08-18 | 北京航空航天大学 | A kind of " pot cover effect " test instrument |
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