Model test system for simulating diversion of recharge pipeline and recharge well depth optimization method

Abstract

The invention belongs to the technical field of municipal construction, and provides a model test system for simulating diversion of a recharge pipeline and a recharge well depth optimization method.The model test system comprises an experiment box used for containing test materials and a recharge well simulation mechanism arranged in the experiment box; the water injection mechanism is connected with the recharge well simulation mechanism through a water injection pipeline assembly; the recharge well simulation mechanism comprises a plurality of telescopic pipes; the water injection pipeline assembly comprises a main pipeline connected with the water injection mechanism, each telescopic pipe is connected with the main pipeline through a branch pipeline, and each branch pipeline is provided with a branch pipe flowmeter; in the testing process, the lengths of the telescopic pipes and / or the water injection pressure and flow are adjusted, so that the flow detected by the branch pipe flow meters is kept consistent, simulation of the process of shunting from the underground water recharge main pipeline to all the recharge wells is achieved, and the design depth and interval of the recharge wells can be optimized according to the simulation result.

Description

Technical Field

[0001] The invention belongs to the technical field of municipal construction, and in particular relates to a model test system for simulating recharging pipeline diversion and a recharging well depth optimization method. Background Art

[0002] When developing underground space, continuous pumping and drainage are required to lower the groundwater level in the construction area to facilitate engineering construction. Long-term and large-scale pumping and drainage will destroy the groundwater circulation system, causing waste of groundwater resources, while causing surrounding ground subsidence and collapse, threatening the safety of surrounding buildings; groundwater recharge is the most direct and effective way to protect water resources and ensure the safety of surrounding buildings.

[0003] The inventors found that the current groundwater recharge design is still mainly based on manual experience. The design depth of the recharge well group is usually set to a uniform depth, without considering the uneven flow into each recharge well due to pipeline diversion, resulting in waste in the recharge well structure design. Analytical calculations cannot consider the impact of the recharge well spacing and pipeline size on the diversion effect, and numerical calculations are too simplified and inconsistent with reality. Summary of the invention

[0004] In order to solve the above problems, the present invention proposes a model test system for simulating the diversion of reinjection pipelines and a method for optimizing the depth of reinjection wells, which realizes the simulation of the diversion process of the groundwater reinjection main pipeline to each reinjection well, and can optimize the design depth and spacing of the reinjection wells accordingly.

[0005] In order to achieve the above-mentioned object, in a first aspect, the present invention provides a model test system for simulating recharging pipe diversion, which adopts the following technical scheme:

[0006] A model test system for simulating recharging pipeline diversion, comprising an experimental box for placing test materials, a recharging well simulation mechanism arranged in the experimental box, and a water injection mechanism connected to the recharging well simulation mechanism through a water injection pipeline assembly;

[0007] The reinjection well simulation mechanism includes a plurality of telescopic pipes; the water injection pipeline assembly includes a main pipeline connected to the water injection mechanism, each telescopic pipe is connected to the main pipeline through a branch pipeline, and each branch pipeline is provided with a branch flow meter;

[0008] By adjusting the length of the telescopic tube, and / or adjusting the water injection pressure and flow rate, the flow rate detected by the branch flow meter can be kept consistent.

[0009] Furthermore, the experimental box is a transparent experimental box, and the experimental box includes a plurality of transparent resin plates assembled to each other.

[0010] Furthermore, a drain valve is provided on the experimental box.

[0011] Furthermore, a water level monitoring element is provided on the experimental box.

[0012] Furthermore, a main pipe flow meter is provided on the main pipe; and a switch valve is also provided on each branch pipe.

[0013] Furthermore, the main pipe flowmeter is arranged at the water inlet end of the main pipe, and the branch pipe flowmeter is arranged at the water injection section of the branch pipe.

[0014] Furthermore, a glass tube is provided between the telescopic tube and the branch pipe, and the telescopic tube is a transparent tube.

[0015] Furthermore, the telescopic tube includes a plurality of telescopic tube units, and the telescopic tube units are provided with water filtering holes.

[0016] In order to achieve the above object, in a second aspect, the present invention also provides a model test method for simulating recharging pipe diversion, which adopts the following technical scheme:

[0017] A model test method for simulating recharge pipe diversion adopts the model test system for simulating recharge pipe diversion as described in the first aspect, including: adjusting the length of the telescopic pipe and / or adjusting the water injection pressure and flow rate so that the flow detected by the branch flow meter remains consistent.

[0018] In order to achieve the above-mentioned purpose, in a third aspect, the present invention also provides a method for optimizing the depth of a reinjection well, which adopts the following technical scheme:

[0019] A method for optimizing the depth of a reinjection well adopts a model test system for simulating the diversion of a reinjection pipeline as described in the first aspect, including: adjusting the length of the telescopic pipe and / or adjusting the injection pressure and flow rate so that the flow rate detected by the branch flow meter remains consistent; and determining the depth of the reinjection well by using the telescopic filter length at this time.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The test system in this embodiment includes an experimental box for placing test materials, a recharge well simulation mechanism arranged in the experimental box, and a water injection mechanism connected to the recharge well simulation mechanism through a water injection pipeline assembly; the recharge well simulation mechanism includes a plurality of telescopic pipes; the water injection pipeline assembly includes a main pipeline connected to the water injection mechanism, each telescopic pipe is connected to the main pipeline through a branch pipeline, and each branch pipeline is provided with a branch flow meter; during the test, by adjusting the length of the telescopic pipe, and / or adjusting the injection pressure and flow, the flow detected by the branch flow meter remains consistent, thereby realizing the simulation of the diversion process of the groundwater recharge main pipeline to each recharge well, and the design depth and spacing of the recharge well can be optimized accordingly.

[0022] The test system of the present invention has low manufacturing cost and economic advantage; the test system has simple structure, convenient operation and can be reused, thus reducing the test cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings in the specification that constitute a part of this embodiment are used to provide a further understanding of this embodiment. The schematic embodiments of this embodiment and their descriptions are used to explain this embodiment and do not constitute improper limitations on this embodiment.

[0024] Figure 1 This is a schematic diagram of the system structure of Example 1 of the present invention;

[0025] Figure 2 Schematic diagram of a reinjection well simulation mechanism according to Embodiment 1 of the present invention;

[0026] Figure 3 It is a schematic diagram of the extended state of the reinjection well simulation mechanism of Example 1 of the present invention;

[0027] Figure 4 Schematic diagram of the reinjection well status at different lengths according to Example 1 of the present invention;

[0028] Figure 5 is a flow chart of the method of embodiment 1 of the present invention;

[0029] Among them, 1. Experimental box; 2. Water injection mechanism; 3. Water injection pipeline assembly; 4. Recharge well simulation mechanism; 5. Transparent resin plate; 6. Drain valve; 7. Water level monitoring element; 8. Main pipeline; 9. Branch pipeline; 10. Main flow meter; 11. Branch flow meter; 12. Switch valve; 13. Glass tube; 14. Telescopic tube; 15. Telescopic tube unit; 16. Water filter hole. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0031] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0032] Embodiment 1:

[0033] With the rapid development of the economy and society, the ground space can no longer meet people's development needs, and urban underground space development has begun. When developing underground space, it is necessary to continuously pump and drain water to lower the groundwater level in the construction area to facilitate engineering construction. However, long-term and large-scale pumping and drainage will destroy the groundwater circulation system, causing waste of groundwater resources, and at the same time cause surrounding ground subsidence and collapse, threatening the safety of surrounding buildings. Groundwater recharge is the most direct and effective way to protect water resources and ensure the safety of surrounding buildings.

[0034] According to the inventors, the current design of groundwater recharge is still mainly based on manual experience. The design depth of the recharge well group is usually set to a uniform depth. The pipeline diversion leads to uneven flow into each recharge well, which causes waste in the structural design of the recharge well. Analytical calculations cannot take into account the impact of the recharge well spacing and pipeline size on the diversion effect, and numerical calculations are simplified too much and do not conform to reality. The physical model test can reproduce the process of distributing the flow of each recharge well branch pipe in the recharge main pipeline under the condition of meeting similar criteria. At present, there is a lack of a recharge pipeline diversion model test system and a recharge well optimization method.

[0035] In response to the above problems, Figure 1 As shown, this embodiment provides a model test system for simulating the diversion of the reinjection pipeline, which realizes the simulation of the diversion process of the groundwater reinjection main pipeline to each reinjection well, and can optimize the design depth and interval of the reinjection well. The system includes an experimental box 1, a water injection mechanism 2, a water injection pipeline assembly 3, and a reinjection well simulation mechanism 4; the experimental box 1 can be optionally a transparent experimental box. The water injection mechanism 2 injects water into the reinjection well simulation mechanism 4 through the water injection pipeline assembly 3; the reinjection well simulation mechanism 4 is buried in the test material in the experimental box 1.

[0036] like Figure 1 As shown, the test box 1 is formed by assembling rows of transparent resin plates 5 for carrying model test materials. The model test materials can be made of conventional materials and will not be described in detail here. The transparent resin plates 5 can be high-strength transparent resin plates.

[0037] A drain valve 6 is installed at the bottom of the experimental box 1. Optionally, three drain valves 6 are distributed at the bottom of each side of the experimental box 1. The drain valve 6 is an automatically controlled drain valve.

[0038] The drain valve 6 is connected to a water level monitoring element 7 , and the degree of opening and closing of the drain valve is automatically controlled according to the water level in the experimental box 1 .

[0039] In order to avoid errors caused by the size limitation of the experimental box 1, during refilling, the drain valve 6 automatically adjusts the opening and closing degree of the drain valve according to the height of the refilling water level to release water, thereby ensuring that the water level in the experimental box 1 is maintained at a certain height.

[0040] The water injection mechanism 2 injects water into the reinjection well simulation mechanism 4 under pressure through the water injection pipeline assembly 3. The reinjection pressure can be adjusted according to the test requirements. Under the same test conditions, the reinjection pressure and reinjection flow rate remain consistent.

[0041] The water injection pipeline assembly 3 includes the main pipeline 8, the branch pipeline 9, the main flowmeter 10, the branch flowmeter 11 and the switch valve 12, etc., which are used to simulate the process of water in the reinjection pipeline being diverted to each reinjection well.

[0042] The branch pipe 9 is connected to the main pipe 8; the main pipe flowmeter 10 is installed at the water inlet end of the main pipe 8, and the branch pipe flowmeter 11 is installed at the water injection section of the branch pipe 9; the switch valve 12 is installed on the branch pipe 9, located at the front end of the branch pipe flowmeter 11.

[0043] like Figure 2 and Figure 3 As shown, the reinjection well simulation mechanism 4 includes a glass tube 13 and a telescopic tube 14 , and the top end of the glass tube 13 is connected to the branch pipe 9 .

[0044] The telescopic tube 14 is composed of a telescopic tube unit 15, and the length can be freely adjusted. The telescopic tube unit 15 is provided with water filtering holes 16.

[0045] The working method or process of this embodiment is:

[0046] like Figure 4 and Figure 5 As shown, the reinjection well simulation mechanism 4 is inserted into the experimental material in the experimental box 1 and connected to the water injection pipeline assembly 3;

[0047] Adjust the telescopic length of the telescopic pipe of the recharging well simulation mechanism 4 to be consistent;

[0048] Open the water injection mechanism 2 to start water injection, record the main flow and each branch flow, affected by the distance between the reinjection well simulation mechanism 4 and the water injection mechanism 2 and the flow diversion, the flow of each reinjection branch is different;

[0049] Adjust the length of the telescopic pipe of the recharging well simulation mechanism 4 to keep the flow rates of each branch pipe consistent; or adjust the recharging water injection pressure and water injection flow rate, and adjust the length of the telescopic pipe to keep the flow rates of each branch pipe consistent;

[0050] When the branch flow rates remain consistent, the length of each expansion pipe is the optimal structure of the reinjection well.

[0051] Embodiment 2:

[0052] The present embodiment provides a model test method for simulating the diversion of a reinjection pipe, which adopts the model test system for simulating the diversion of a reinjection pipe as described in Example 1, including: adjusting the length of the telescopic pipe, and / or adjusting the injection pressure and flow rate, so that the flow rate detected by the branch flow meter remains consistent.

[0053] Embodiment 3:

[0054] This embodiment provides a method for optimizing the depth of a reinjection well, using a model test system for simulating reinjection pipeline diversion as described in Example 1, comprising: the reinjection well simulation mechanism 4 is inserted into the experimental material in the experimental box 1, and connected to the water injection pipeline assembly 3;

[0055] Adjust the telescopic length of the telescopic pipe of the recharging well simulation mechanism 4 to be consistent;

[0056] Open the water injection mechanism 2 to start water injection, record the main flow and each branch flow, affected by the distance between the reinjection well simulation mechanism 4 and the water injection mechanism 2 and the flow diversion, the flow of each reinjection branch is different;

[0057] Adjust the length of the telescopic pipe of the recharging well simulation mechanism 4 to keep the flow rates of each branch pipe consistent; or adjust the recharging water injection pressure and water injection flow rate, and adjust the length of the telescopic pipe to keep the flow rates of each branch pipe consistent;

[0058] When the branch flow rates remain consistent, the length of each expansion pipe is the optimal structure of the reinjection well.

[0059] The above description is only a preferred embodiment of the present embodiment and is not intended to limit the present embodiment. For those skilled in the art, the present embodiment may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present embodiment shall be included in the protection scope of the present embodiment.

Claims

1. A model test system for simulating recharging pipe diversion, characterized in that: It comprises an experimental box for placing test materials, a reinjection well simulation mechanism arranged in the experimental box, and a water injection mechanism connected to the reinjection well simulation mechanism through a water injection pipeline assembly; The reinjection well simulation mechanism includes a plurality of telescopic pipes; the water injection pipeline assembly includes a main pipeline connected to the water injection mechanism, each telescopic pipe is connected to the main pipeline through a branch pipeline, and each branch pipeline is provided with a branch flow meter; By adjusting the length of the telescopic tube, and / or adjusting the water injection pressure and flow rate, the flow rate detected by the branch flow meter can be kept consistent.

2. The model test system for simulating recharging pipe diversion according to claim 1, characterized in that: The experimental box is a transparent experimental box, and the experimental box comprises a plurality of transparent resin plates assembled with each other.

3. The model test system for simulating recharging pipe diversion according to claim 1, characterized in that: The experimental box is provided with a drain valve.

4. The model test system for simulating recharging pipe diversion as claimed in claim 3, characterized in that: The experimental box is provided with a water level monitoring element.

5. The model test system for simulating recharging pipe diversion according to claim 1, characterized in that: The main pipeline is provided with a main flow meter; each branch pipeline is also provided with a switch valve.

6. The model test system for simulating recharging pipe diversion as claimed in claim 5, characterized in that: The main pipe flow meter is arranged at the water inlet end of the main pipe, and the branch pipe flow meter is arranged at the water injection section of the branch pipe.

7. The model test system for simulating recharging pipe diversion according to claim 1, characterized in that: A glass tube is arranged between the telescopic tube and the branch pipe, and the telescopic tube is a transparent tube.

8. The model test system for simulating recharging pipe diversion according to claim 1, characterized in that: The telescopic pipe comprises a plurality of telescopic pipe units, and water filtering holes are arranged on the telescopic pipe units.

9. A model test method for simulating recharging pipe diversion, characterized in that: The model test system for simulating the recharging pipe diversion as described in any one of claims 1 to 8 is adopted, including: adjusting the length of the telescopic pipe, and / or adjusting the injection pressure and flow rate so that the flow rate detected by the branch flow meter remains consistent.

10. A method for optimizing the depth of a recharging well, characterized in that: A model test system for simulating reinjection pipeline diversion as described in any one of claims 1 to 8 is used, including: adjusting the length of the telescopic pipe, and / or adjusting the injection pressure and flow rate, so that the flow rate detected by the branch flow meter remains consistent; and determining the depth of the reinjection well by using the telescopic filter length at this time.

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