CN108346363B - Experimental device for simulating underground water recharging well and application method thereof - Google Patents
Experimental device for simulating underground water recharging well and application method thereof Download PDFInfo
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- CN108346363B CN108346363B CN201810327343.7A CN201810327343A CN108346363B CN 108346363 B CN108346363 B CN 108346363B CN 201810327343 A CN201810327343 A CN 201810327343A CN 108346363 B CN108346363 B CN 108346363B
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Abstract
The invention discloses an experimental device for simulating a groundwater recharge well and a use method thereof, wherein the experimental device comprises a fixed base, and an inner well pipe, a middle well pipe and an outer well pipe which are vertically arranged above the fixed base, wherein the inner well pipe, the middle well pipe and the outer well pipe are sequentially nested from inside to outside, a bottom plug capable of moving up and down is arranged in the inner well pipe, a filter material layer is filled between the inner well pipe and the middle well pipe, and vertical strip-shaped slits are formed in the inner well pipe, the middle well pipe and the outer well pipe. The experimental device for simulating the underground water recharging well and the application method thereof provided by the invention can simulate different well depths, are simple and convenient to operate, can backwash a filter material layer, are not easy to block, and have low experimental cost and high experimental efficiency.
Description
Technical Field
The invention relates to the technical field of groundwater physical simulation experiments, in particular to an experimental device for simulating a groundwater recharge well and a use method thereof.
Background
Groundwater is an important water supply source in many urban and rural areas of our country. In recent decades, due to excessive development and utilization of groundwater resources, the groundwater resources are increasingly deficient, so that ecological environment problems such as continuous decline of groundwater level, ground subsidence, invasion of seawater (salty) water, land desertification and the like are caused, sustainability of the groundwater resources is maintained, and groundwater systems are protected and repaired. Although the underground water system has a certain natural regulation capability, the self-regulation capability is gradually degraded under the strong influence of human activities, so that the manual regulation and storage of the underground water by taking manual recharging as a main technical means has become an important measure for preventing the continuous lack of underground water resources and maintaining the functions of the underground water system.
Well recharging is one of the important ways to manually recharge groundwater. On the one hand, it is the only way to manually supply deep pressurized water, and on the other hand, it is one of the most effective ways to directly manually supply diving, especially when the aeration zone has a weak permeable layer. In addition, when the underground water is manually replenished in an artificial building dense area such as a built-up area, an industrial park and the like, the earth surface replenishing mode is generally difficult to realize due to the limitation of land resources, and a recharging well can play a role.
When the recharging well is arranged, the well depth of the recharging well is an important parameter, the well depth is too small to achieve the recharging effect, the well depth is too large, and the economic cost is correspondingly high, so that the proper recharging well depth is required to be selected to achieve the requirements of good recharging effect and low cost. The indoor sand tank physical simulation experiment is a common means for researching the underground water manual recharging technology, and the most suitable recharging well depth is obtained through the simulation experiment test. When carrying out sand tank physical simulation experiment, in order to simulate the recharging well of different well depths, generally need bury the well pipe of a plurality of different depths in the simulation sand tank, occupy great space in the simulation sand tank, the cost is higher, simultaneously, receive recharging water source quality of water to influence, the frequent filter material layer jam phenomenon that takes place of groundwater recharging in-process, consequently need carry out periodic replacement to the filter material layer, waste time and energy, have influenced the efficiency and the effect of physical simulation experiment.
The invention provides an experimental device for simulating a groundwater recharge well and a use method thereof, which can simulate different well depths, are simple and convenient to operate, can backwash a filter material layer, are not easy to block, and have low experimental cost and high experimental efficiency.
Disclosure of Invention
The invention aims to provide an experimental device for simulating a groundwater recharge well and a use method thereof, which are used for solving the problems that the conventional single recharge well simulation device is fixed in well depth, cannot perform various well depth tests, is high in experimental cost and low in experimental efficiency, and is easy to cause blockage of a filter material layer.
In order to achieve the above purpose, the technical scheme of the invention is as follows: the experimental device comprises a fixed base, and an inner well pipe, a middle well pipe and an outer well pipe which are vertically arranged above the fixed base, wherein the inner well pipe, the middle well pipe and the outer well pipe are sequentially nested from inside to outside, a bottom hole plug capable of moving up and down is arranged in the inner well pipe, a filter material layer is filled between the inner well pipe and the middle well pipe, and vertical strip-shaped slits are formed in the inner well pipe, the middle well pipe and the outer well pipe.
Preferably, the periphery of the bottom hole plug is sleeved with a rubber ring.
Preferably, a push-pull rod is connected in the middle of the bottom hole plug.
Preferably, the bottom hole plug is connected with the lower end of the push-pull rod through threads.
Preferably, the outer walls of the inner well pipe, the middle well pipe and the outer well pipe are all wrapped with a layer of filter screen.
Preferably, the pore diameter of the filter screen is 0.2mm.
Preferably, the outer diameters of the inner well pipe, the middle well pipe and the outer well pipe are respectively 10cm, 20cm and 30cm, and the heights of the inner well pipe, the middle well pipe and the outer well pipe are respectively 1m.
Preferably, the length of the strip-shaped slit is 10cm, and the width of the strip-shaped slit is 2mm.
Preferably, the filter material layer comprises coarse sand, crushed stone, glass beads or ceramic particles.
The invention also provides a using method of the experimental device for simulating the groundwater recharge well, which comprises the following steps:
placing the experimental device at a proper position in a simulated sand tank, filling a medium in the simulated sand tank, exposing a well pipe opening of the experimental device above the surface of the medium, and fixing a well bottom plug at a well depth position needing simulation in an inner well pipe;
continuously introducing recharging water from the pipe orifice of the inner well pipe, filling the space above the bottom plug of the inner well pipe with the recharging water, continuously exuding from the strip-shaped slits on the inner well pipe, filtering by the filter material layer, sequentially flowing out from the strip-shaped slits on the middle well pipe and the outer well pipe into the medium in the simulated sand tank, monitoring the change of the water level in the simulated sand tank in unit time, and testing the recharging amount in unit time under the well depth;
the height of the well bottom plug in the inner well pipe is adjusted up and down by pulling the push-pull rod, and the recharging amount of unit time under different well depths is tested according to the method;
after the simulation experiment is finished, clean water is injected into the annular space between the outer well pipe and the middle well pipe at regular intervals, and simultaneously, the water is pumped outwards from the inner well pipe, so that the back flushing of the filter material layer filled between the inner well pipe and the middle well pipe is realized, and the filter material layer is prevented from being blocked.
The invention has the following advantages:
the invention provides an experimental device for simulating a groundwater recharge well and a use method thereof, wherein a bottom hole plug capable of moving up and down is arranged in an inner well pipe, the well depth of the inner well pipe is adjusted by adjusting the position of the bottom hole plug, a section of well pipe positioned below the bottom hole plug in the inner well pipe is blocked and can be regarded as an invalid well pipe, different recharge well depths can be simulated, recharge effects at different well depths can be tested by only using a single recharge well simulation device, and the most appropriate well depth values with excellent recharge effects and low economic cost can be obtained without arranging a plurality of well depth simulation devices, so that the experimental device is simple and economical and convenient to operate; meanwhile, the experimental device is provided with three layers of well pipes which are mutually nested, the outer layer filled with the filter material layer is further provided with an outer well pipe, clean water can be injected into a space between the outer well pipe and the middle well pipe, and water is pumped from the inner well pipe, so that backwashing of the filter material layer is realized, the filter material layer can be effectively prevented and treated from being blocked, the experimental cost is saved, and the experimental efficiency is improved.
Drawings
FIG. 1 is a schematic diagram of an experimental apparatus for simulating a groundwater recharge well according to the present invention.
FIG. 2 is a top view of an experimental apparatus simulating a groundwater recharge well in accordance with the invention.
FIG. 3 is a schematic cross-sectional view of an experimental apparatus simulating a groundwater recharge well in accordance with the invention.
Detailed Description
The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
Example 1
As shown in fig. 1, the experimental device for simulating a groundwater recharge well provided by the embodiment comprises a fixed base 1, and an inner well pipe 2, a middle well pipe 3 and an outer well pipe 4 which are vertically arranged above the fixed base 1, wherein the inner well pipe 2, the middle well pipe 3 and the outer well pipe 4 are sequentially nested from inside to outside, a bottom plug 5 capable of moving up and down is arranged in the inner well pipe 2, a rubber ring 51 is sleeved on the periphery of the bottom plug, a push-pull rod 6 is connected in the middle of the bottom plug 5, and the bottom plug 5 is connected with the lower end of the push-pull rod 5 through threads.
As shown in fig. 2, a filter material layer 7 is filled between the inner well pipe 2 and the middle well pipe 3, the filter material layer 7 can comprise coarse sand, crushed stones, glass beads or ceramic particles, some impurities in the recharging water can be filtered, and as shown in fig. 3, vertical strip-shaped slits 8 are formed in the inner well pipe 2, the middle well pipe 3 and the outer well pipe 4.
As shown in figure 2, the outer walls of the inner well pipe 2, the middle well pipe 3 and the outer well pipe 4 are all wrapped with a layer of filter screen 9, the aperture of the filter screen 9 is 0.2mm, and impurities such as sandy soil media in a simulated sand tank can be prevented from entering an experimental device, and the filter material layer 7 is blocked.
The outer diameters of the inner well pipe 2, the middle well pipe 3 and the outer well pipe 4 are respectively 10cm, 20cm and 30cm, and the heights of the inner well pipe 2, the middle well pipe 3 and the outer well pipe 4 are respectively 1m. The diameter of the bottom plug 5 is the same as the inner diameter of the inner tubular 2. The length of the strip-shaped slit 8 is 10cm, the width of the strip-shaped slit 8 is 2mm, the distance between the left strip-shaped slit and the right strip-shaped slit is 5-10mm, and the distance between the upper strip-shaped slit and the lower strip-shaped slit is 15-20mm.
The inner well pipe 2, the middle well pipe 3, the outer well pipe 4 and the well bottom plug 5 are all made of organic glass materials.
The application method of the experimental device for simulating the groundwater recharge well in the embodiment comprises the following steps: placing the experimental device at a proper position in a simulated sand tank, filling sand and other mediums in the simulated sand tank, exposing a well pipe opening of the experimental device above the surface of the mediums, and fixing a well bottom plug 5 at a well depth position needing simulation in an inner well pipe 2; continuously introducing recharging water from the pipe orifice of the inner well pipe 2, filling the space above the bottom plug 5 in the inner well pipe 2 with the recharging water, continuously exuding from the strip-shaped slits 8 on the inner well pipe 2, filtering by the filter material layer 7, sequentially flowing out from the strip-shaped slits 8 on the middle well pipe 3 and the outer well pipe 4 into a medium in the simulated sand tank, monitoring the change of the water level in the simulated sand tank in unit time, and testing the recharging amount in unit time under the well depth; the height of the well bottom plug 5 in the inner well pipe 2 is adjusted up and down by pulling the push-pull rod 6, and the recharging amount of unit time under different well depths is tested according to the method; after the simulation experiment is finished, clean water is periodically injected into the annular space between the outer well pipe 4 and the middle well pipe 3, and simultaneously the water is pumped outwards from the inner well pipe 2, so that the back flushing of the filter material layer 7 filled between the inner well pipe 2 and the middle well pipe 3 is realized, and the filter material layer 7 is prevented from being blocked.
The invention provides an experimental device for simulating a groundwater recharge well and a use method thereof, wherein a bottom hole plug capable of moving up and down is arranged in an inner well pipe, the well depth of the inner well pipe is adjusted by adjusting the position of the bottom hole plug, a section of well pipe positioned below the bottom hole plug in the inner well pipe is blocked and can be regarded as an invalid well pipe, different recharge well depths can be simulated, recharge effects at different well depths can be tested by only using a single recharge well simulation device, and the most appropriate well depth values with excellent recharge effects and low economic cost can be obtained without arranging a plurality of well depth simulation devices, so that the experimental device is simple and economical and convenient to operate; meanwhile, the experimental device is provided with three layers of well pipes which are mutually nested, the outer layer filled with the filter material layer is further provided with an outer well pipe, clean water can be injected into a space between the outer well pipe and the middle well pipe, and water is pumped from the inner well pipe, so that backwashing of the filter material layer is realized, the filter material layer can be effectively prevented and treated from being blocked, the experimental cost is saved, and the experimental efficiency is improved.
While the invention has been described in detail in the foregoing general description and specific examples, it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the invention and are intended to be within the scope of the invention as claimed.
Claims (9)
1. The use method of the experimental device for simulating the underground water recharging well comprises a fixed base (1) and an inner well pipe (2), a middle well pipe (3) and an outer well pipe (4) which are vertically arranged above the fixed base (1), wherein the inner well pipe (2), the middle well pipe (3) and the outer well pipe (4) are sequentially nested from inside to outside, a bottom hole plug (5) capable of moving up and down is arranged in the inner well pipe (2), a filter material layer (7) is filled between the inner well pipe (2) and the middle well pipe (3), and vertical strip-shaped slotting (8) is arranged on each of the inner well pipe (2), the middle well pipe (3) and the outer well pipe (4); the using method is characterized by comprising the following steps:
placing the experimental device at a proper position in a simulated sand tank, filling a medium in the simulated sand tank, exposing a well pipe opening of the experimental device above the surface of the medium, and fixing a well bottom plug at a well depth position needing simulation in an inner well pipe;
continuously introducing recharging water from the pipe orifice of the inner well pipe, filling the space above the bottom plug of the inner well pipe with the recharging water, continuously exuding from the strip-shaped slits on the inner well pipe, filtering by the filter material layer, sequentially flowing out from the strip-shaped slits on the middle well pipe and the outer well pipe into the medium in the simulated sand tank, monitoring the change of the water level in the simulated sand tank in unit time, and testing the recharging amount in unit time under the well depth;
the height of the well bottom plug in the inner well pipe is adjusted up and down by pulling the push-pull rod, and the recharging amount of unit time under different well depths is tested according to the method;
after the simulation experiment is finished, clean water is injected into the annular space between the outer well pipe and the middle well pipe at regular intervals, and simultaneously, the water is pumped outwards from the inner well pipe, so that the back flushing of the filter material layer filled between the inner well pipe and the middle well pipe is realized, and the filter material layer is prevented from being blocked.
2. The method for using the experimental device for simulating a groundwater recharge well according to claim 1, wherein the periphery of the bottom hole plug (5) is sleeved with a rubber ring (51).
3. The method for using the experimental device for simulating the groundwater recharge well according to claim 1, wherein a push-pull rod (6) is connected in the middle of the bottom hole plug (5).
4. The method for using the experimental device for simulating a groundwater recharge well according to claim 1, wherein the bottom hole plug (5) is connected with the lower end of the push-pull rod (6) through threads.
5. The method for using the experimental device for simulating a groundwater recharge well according to claim 1, wherein the outer walls of the inner well pipe (2), the middle well pipe (3) and the outer well pipe (4) are all wrapped with a layer of filter screen (9).
6. The method of using an experimental device for simulating a groundwater recharge well according to claim 5, wherein the pore size of the filter screen (9) is 0.2mm.
7. The method for using the experimental device for simulating a groundwater recharge well according to claim 1, wherein the outer diameters of the inner well pipe (2), the middle well pipe (3) and the outer well pipe (4) are respectively 10cm, 20cm and 30cm, and the heights of the inner well pipe (2), the middle well pipe (3) and the outer well pipe (4) are respectively 1m.
8. The method for using the experimental device for simulating a groundwater recharge well according to claim 1, wherein the length of the strip-shaped slit (8) is 10cm, and the width of the strip-shaped slit (8) is 2mm.
9. Use of an experimental device for simulating a groundwater recharge well according to claim 1, characterized in that the filter layer (7) comprises coarse sand, crushed stone, glass beads or ceramic particles.
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| CN201810327343.7A CN108346363B (en) | 2018-04-12 | 2018-04-12 | Experimental device for simulating underground water recharging well and application method thereof |
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| CN109839491B (en) * | 2019-04-02 | 2021-11-02 | 中国地质科学院水文地质环境地质研究所 | Underground water back-supplementing simulation experiment method |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2632593Y (en) * | 2003-06-26 | 2004-08-11 | 扶承发 | Water source well system for sucking and filling alternatively |
| JP2007262766A (en) * | 2006-03-29 | 2007-10-11 | Shimizu Corp | Recharge method and underground water recharge system used for the same |
| CN201176596Y (en) * | 2008-06-05 | 2009-01-07 | 上海广联建设发展有限公司 | Pipe well simultaneous for draining and pressure-reduction dewatering |
| CN103741671A (en) * | 2014-01-22 | 2014-04-23 | 上海长凯岩土工程有限公司 | Groundwater recharge system structure for foundation pit dewatering |
| CN104018511A (en) * | 2014-03-26 | 2014-09-03 | 福州市规划设计研究院 | Construction process of underground construction drainage anti-floating device |
| CN105092798A (en) * | 2015-09-07 | 2015-11-25 | 济南轨道交通集团有限公司 | Indoor recirculation system for simulating varying-head water-permeable soil layer phreatic water stratum and experimental method |
| CN204925080U (en) * | 2015-09-07 | 2015-12-30 | 济南轨道交通集团有限公司 | Simulation becomes indoor system of recharging in flood peak permeable ground dive stratum |
| CN205502043U (en) * | 2016-03-18 | 2016-08-24 | 山东省城乡建设勘察设计研究院 | Novel light -duty well device |
| CN208580537U (en) * | 2018-04-12 | 2019-03-05 | 水利部交通运输部国家能源局南京水利科学研究院 | A kind of experimental provision of simulated groundwater inverted well |
-
2018
- 2018-04-12 CN CN201810327343.7A patent/CN108346363B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2632593Y (en) * | 2003-06-26 | 2004-08-11 | 扶承发 | Water source well system for sucking and filling alternatively |
| JP2007262766A (en) * | 2006-03-29 | 2007-10-11 | Shimizu Corp | Recharge method and underground water recharge system used for the same |
| CN201176596Y (en) * | 2008-06-05 | 2009-01-07 | 上海广联建设发展有限公司 | Pipe well simultaneous for draining and pressure-reduction dewatering |
| CN103741671A (en) * | 2014-01-22 | 2014-04-23 | 上海长凯岩土工程有限公司 | Groundwater recharge system structure for foundation pit dewatering |
| CN104018511A (en) * | 2014-03-26 | 2014-09-03 | 福州市规划设计研究院 | Construction process of underground construction drainage anti-floating device |
| CN105092798A (en) * | 2015-09-07 | 2015-11-25 | 济南轨道交通集团有限公司 | Indoor recirculation system for simulating varying-head water-permeable soil layer phreatic water stratum and experimental method |
| CN204925080U (en) * | 2015-09-07 | 2015-12-30 | 济南轨道交通集团有限公司 | Simulation becomes indoor system of recharging in flood peak permeable ground dive stratum |
| CN205502043U (en) * | 2016-03-18 | 2016-08-24 | 山东省城乡建设勘察设计研究院 | Novel light -duty well device |
| CN208580537U (en) * | 2018-04-12 | 2019-03-05 | 水利部交通运输部国家能源局南京水利科学研究院 | A kind of experimental provision of simulated groundwater inverted well |
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