CN114923661A - Radial well flow test system and method for implanted relief well - Google Patents
Radial well flow test system and method for implanted relief well Download PDFInfo
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M10/00—Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Abstract
The invention provides a radial well flow test system and a radial well flow test method for an implanted relief well, wherein the system comprises a graded overflow water supply device, a radial inflow device, a test model container, a digital pressure measuring device, an implanted power device and a double-layer relief well pipe device; the grading overflow water supply device is used for controlling the water level of the overflow water supply tank; the test model container is used for placing a test model, and the test model sequentially comprises a sand layer, a clay layer and a detachable drainage layer from bottom to top; the radial inflow device is used for providing uniform and stable radial inflow for the test model container. The invention is based on a large-scale test device, utilizes a radial well flow test method, truly simulates the whole process of the emergency rescue of the binary-structure foundation-implanted relief well, and obtains various parameters such as depth reduction, unit depth reduction flow and the like which can be achieved by the relief well when the piping dangerous case occurs in the flood period, thereby providing exact reference for researching and integrating relief well rescue equipment capable of being rapidly assembled and constructed and improving the emergency rescue capability of the relief well.
Description
Technical Field
The invention relates to the field of test instruments and equipment, in particular to an implanted relief well radial well flow test system and method, which are suitable for underground water well flow model tests.
Background
The well is widely applied to projects of groundwater water taking, water collection, recharging and the like as an underground building, the existing pipe wells are very many in types, including wire-wound pipe wells, bridge type pipe wells, porous pipe wells and the like, the pore-forming mode comprises drilling well forming and implanting well forming, most of the existing well pipes adopt drilling well forming, and the implanting well forming is applied to high-pressure water foundations because the implanting well forming is directly realized by soil squeezing, the well forming speed is high, the troubles of hole collapse and the like are avoided, and the design parameters of the implanting well forming are dependent on a large number of experimental researches. Therefore, the research and development of the implanted relief well radial well flow test system can supplement the shortage of a well flow radial test platform, truly reflect the well flow characteristics of the groundwater flowing radially at the periphery of the well structure, and solve the defect that the permeameter only plays a role in a vertical or horizontal test and cannot truly reflect the well flow performance.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides an implanted relief well radial well flow test system and method, which can simulate a test environment under a real high-pressure water foundation working condition, solve the defects in the test size of an indoor model, break through the thinking of reducing the size of a well pipe in the traditional indoor relief well test, provide an original-size implanted relief well radial well flow test system to verify and improve the design of various physical parameters, eliminate the scale effect to the maximum extent and restore the characteristics of the real radial well flow as far as possible.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
an implanted relief well radial well flow test system comprises a graded overflow water supply device, a radial inflow device, a test model container, a digital pressure measuring device, an implanted power device and a double-layer relief well pipe device;
the graded overflow water supply device comprises a water source valve, a multistage booster pump control terminal, an overflow pipeline, a multistage booster pump, a water pipeline, an overflow water supply tank and a water head control device, wherein the multistage booster pump is controlled by the water source valve and the multistage booster pump control terminal and pumps water through the water pipeline to enter the overflow water supply tank;
the test model container is used for filling a test soil sample, and the test model sequentially comprises a sand soil layer, an clay layer and a detachable drainage layer from bottom to top;
the radial inflow device is connected with the overflow water supply tank through a PVC steel wire hose, is attached to the outer ring of the test model container in a surrounding manner, and is used for providing uniform and stable radial inflow for the test model container;
the digital pressure measuring device is used for monitoring the water head pressure of the corresponding height positions of the clay layer and the sand layer in the test model container in real time;
the implanted power device is used for providing power to press the double-layer pressure reduction well pipe device into a binary structure soil body of the test model container.
Further, overflow feed tank internal partitioning is dynamic intake chamber, static feed chamber and overflow drainage room, and wherein dynamic intake chamber seals with the overflow drainage room and separates, and static feed chamber separates for at least three water supply chamber, and dynamic intake chamber uses the perforated plate intercommunication with adjacent little water supply chamber, separates through triangle weir stoplog board between water supply chamber adjacent with dynamic intake chamber and the overflow drainage room, connect through the triangle weir steel sheet of different elevations between the at least three water supply chamber, dynamic intake chamber is used for receiving the intaking of multistage booster pump suction, and surplus water is by triangle weir stoplog board overflow, discharges through the overflow pipe.
Furthermore, the triangular weir laminated beam plate is an extensible laminated beam plate formed by sequentially connecting a plurality of steel plates on the lower part of the upper triangular weir by hinges, and water is sealed by a water-sealing strip between the hinges.
Furthermore, the water head control device comprises a lifting control unit, an electric lifter, an infrared electronic distance meter, a fixed pulley and a steel cable, wherein one end of the steel cable is connected with the triangular weir superposed beam plate, and the other end of the steel cable is connected with the electric lifter after bypassing the fixed pulley; the infrared electronic distance meter is arranged at the top of the overflow water supply tank and used for distance measurement and water level identification of the water tank, and the lifting control unit is used for controlling the lifting control unit to lift the triangular weir stop log plate to reach the required water level of the water tank according to the water level of the water tank detected by the infrared electronic distance meter.
Furthermore, the digital pressure measuring device comprises filter heads, an air pressure pipe, an osmometer and a pressure sensor, wherein the filter heads are arranged in a sand layer and a clay layer at certain intervals, the filter heads in the clay layer are connected with the osmometer through the air pressure pipe, and the filter heads in the sand layer are connected with the pressure sensor through the air pressure pipe.
Further, the test model container comprises an inner cylinder with an opening at the upper end, the inner cylinder is a steel cylindrical cavity with the diameter of 100cm and the height of 220cm, the underground buried depth is 110cm, the inner cylinder is a sand layer and is exposed out of the ground by 110cm, the lower part of the inner cylinder is a clay layer, the upper part of the inner cylinder is a detachable water containing cavity which is the drainage layer, and the upper part of the water containing cavity is provided with an inclined water outlet for controlling the downstream water level of the test system.
Further, the inner tube periphery is equipped with the urceolus, the upper end and the sand layer upper end parallel and level of urceolus, and the bottom and the inner tube bottom interval certain distance of urceolus form the grit chamber, the container wall of test model container is regarded as to the inner tube, evenly offers the pore that permeates water on the container wall and forms the porous wall of inner tube, radial influent stream device includes the urceolus with the inner tube encloses establishes the space of formation, is located the space and with the pipeline of PVC steel wire hose intercommunication the hole of permeating water of seting up on the inner tube, the vertical cavity of locating between urceolus and the inner tube of pipeline, and the pipeline is opened the inlet hole towards the urceolus inner wall with even water injection.
An implanted relief well radial well flow test method is carried out by adopting the implanted relief well radial well flow test system, and the method comprises the following steps:
1) selecting a test site, and simulating a working environment suitable for a pressure reducing well pipe and a matched device thereof according to hydrogeological data of piping dangerous situations in a research area;
2) preparing a sample, namely preparing the selected sand sample and clay sample, and spraying, blending and preparing the sample according to a certain water content ratio; laying a gauze at the lower part of the test model container, namely the water inlet section, so as to prevent fine sand particles from leaking from the opening of the side wall; the sample loading density is controlled by adopting a layered loading method, the loading height of each layer is 10-15 cm, the sand layer is filled for 110cm, the clay layer is filled for 60cm, and the sample loading density is 1.4g/cm 3 Thereby realizing the simulation of the binary embankment group;
3) for the test scheme of the implanted relief well, vertically erecting an implanted relief well pipe device at the center of a model, installing a fixing device and an implanted power device, starting an electric elevator, and pressing a double-layer relief well pipe device into a simulated binary embankment base;
4) after the preparation of the model is finished, opening a water inlet valve on a PVC steel wire hose, adding aeration water for saturation, saturating a sand sample by adopting a water quantity control mode through a flow meter arranged at a water inlet of a radial inflow device, and saturating a clay sample by gradually raising the upstream water level;
5) lifting an upstream water head step by step, controlling a triangular weir stop log plate to lift the water level in a static water supply chamber by a water head control device, gradually enlarging the range of the static water supply chamber, observing a test phenomenon and the change condition of the water level of a piezometer pipe, recording the water level of the piezometer pipe arranged outside an overflow water supply tank, measuring the flow of a water outlet, photographing the test phenomenon, and continuously lifting the water head after a measured value is stabilized to enter a next-stage water head test;
6) the design parameters of the relief well device are tested in a pump-free self-flowing mode at the beginning of the test, the foundation is in a high pressure water-bearing state along with the rising of an upstream water head, the water suction pump is adopted to pump water to continuously test the drainage and pressure reduction effects of the relief well, the water inlet valve is closed after the data acquisition is completed or a sample is damaged, the test is finished, and the next test is prepared after the sample is disassembled.
The invention provides an outdoor implanted relief well radial well flow test platform, which is characterized in that an implanted power is provided by a motor to quickly form a well in a test model container in a soil squeezing mode, a water pressure is provided by a graded overflow water supply device to simulate the drainage and pressure reduction effects of self-flowing of an implanted relief well and pumping of water when a piping dangerous situation occurs in a flood season, and tests prove that the implanted relief well can be applied to high-pressure water foundation piping emergency rescue, has a good drainage effect and reduces the water pressure of a soil body of a dike foundation. Compared with a test without the relief well, the relief well test shows that the average permeability reduction is increased by about 60 percent when the clay is subjected to the permeability damage, so that the capability of the soil body for resisting the permeability damage is improved; meanwhile, the radial well flow test platform of the implanted relief well can improve the relevant design parameters of the relief well according to a large amount of test data so as to further improve the drainage and pressure reduction effects of the relief well, and is better applied to emergency rescue in the flood prevention period.
Drawings
FIG. 1 is a cross-sectional view of one embodiment of an implantable relief well radial well flow testing system of the present invention in a testing configuration;
FIG. 2 is a cross-sectional view of one embodiment of an implantable relief well radial well flow test system of the present invention in an initial implantation configuration;
FIG. 3 is a three-dimensional perspective view of an overflow water supply tank in the radial well flow testing system of the implantable relief well of the present invention;
FIG. 4 is a plan view of a triangular weir stop stack plate in a head control device of an implanted relief well radial well flow testing system of the present invention;
FIG. 5 is a top plan view of an overflow supply tank in an implanted relief well radial well flow test system of the present invention (three water supply chambers are used as an example, and the numbers on the figure represent the height of a triangular weir steel plate);
FIG. 6 is an expanded view of a large-caliber test model container and a radial inflow device in the implanted relief well radial well flow test system of the invention;
FIG. 7 is a top view of a large-caliber test model container and a double-layer decompression well pipe device in an implanted decompression well radial well flow test system according to the invention;
FIG. 8 is a distribution form diagram of clay bottom surface bearing water heads of a relief well model in the implanted relief well radial well flow test system.
The reference numerals in the figures are as follows: 1-water source valve; 2-a multistage booster pump control terminal; 3-an overflow pipe; 4-a multistage booster pump; 5-a flow meter; 6-transparent steel wire water pipe; 7-porous permeable plate; 8-a steel plate; 9-a lifting control unit; 10-triangular weir laminated beam plates; 11-an electric elevator; 12-an infrared electronic rangefinder; 13-a fixed pulley; 14-a steel cord; 15-triangular weir steel plate; 16-piezometric tube; 17-overflow triangular weir steel plate; 18-an overflow water supply tank; 19-a viewing window; 20-PVC steel wire hose; 21-an electric elevator; 22-a stopper; 23-a water outlet; 24-test model container; 25-a water inlet; 26-an exhaust valve; 27-a flow meter; 28-water inlet hole; 29-a ground breaking cone; 30-sleeper; 31-a grit chamber; 32-screw rod; 33-a two-layer pressure relief well pipe assembly; 34-angle steel trusses; 35-a circular force-bearing platform; 36-inner cylinder; 37-osmometer; 38-a pressure sensor; 39-outer cylinder; 40-a filter head; 41-inner cylinder porous plate; 42-a screen; 43-a valve; 44-air pressure pipe; 45-sand discharging port; 46-a water inlet valve; 47-a hinge; 48-sealing water seal strip.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings.
Referring to fig. 1 and fig. 2, an embodiment of the radial well flow testing system of the implanted relief well of the present invention is used for testing design parameters of the implanted relief well in a high pressure water foundation, and the system includes a graded overflow water supply device, a radial inflow device, a test model container, a digital pressure measurement device, an implanted power device, and a double-layer relief well pipe device.
The grading overflow water supply device provides a water source for an implanted decompression well radial well flow test, simulates high confined water in a foundation, and comprises an overflow water supply tank 18, a water source valve 1, a multistage booster pump control terminal 2, an overflow pipeline 3, a multistage booster pump 4, a water pipeline 6 and a water head control device. The multistage booster pump 4 is controlled by a water source valve 1 and a control terminal 2, and pumps water through a water pipeline 6 to enter an overflow water supply tank 18. The water head control device mainly comprises a triangular weir laminated beam plate 10 and a lifting control unit 9, wherein the lifting control unit 9 controls the automatic lifting of the triangular weir laminated beam plate 10 to control the water level of an overflow water supply tank 18.
The triangular weir laminated beam plate 10 is an extensible laminated beam plate formed by sequentially connecting a plurality of steel plates at the lower part of an upper triangular weir by hinges 47, and water is sealed between the hinges by a water-sealing strip 48, as shown in fig. 4. The water head control device comprises a lifting control unit 9, an electric lifter 11, an infrared electronic distance measuring instrument 12, a fixed pulley 13 and a steel cable 14, wherein one end of the steel cable 14 is connected with the triangular weir laminated beam plate 10, and the other end of the steel cable is connected with the electric lifter 11 after bypassing the fixed pulley 13; infrared electronic distance meter 12 locates overflow feed water tank 18 top for the range finding discerns the water tank water level, and lift control unit 9 is used for according to the water tank water level control lift control unit 9 that control infrared electronic distance meter 12 detected and promote triangle weir and fold beam slab 10 and reach required water tank water level. The pressure measuring pipe 16 can be installed on the outer side of the overflow water supply tank 18, and the water level in the water tank is verified through the liquid column elevation of the pressure measuring pipe 16 to be accurate to a millimeter level.
The overflow water supply tank 18 is internally divided into 5 cavities for a dynamic water inlet chamber, a static water supply chamber and an overflow drain chamber. The dynamic water inlet chamber is used as a medium for pumping unstable fluctuating flowing water of the water pump water tank, the dynamic water inlet chamber flows through the perforated plate 7 to become static water and enters the static water supply chamber, and the excess water flows through the triangular weir superposed beam plate 10 to overflow into the drainage chamber to be discharged. In terms of unfolding, the dynamic water inlet chamber is separated from the overflow drain chamber by a steel plate 8 with a height of 2.0m, and is connected with the static water supply chamber by a steel plate 8 with a height of 2.0m and a porous plate 7, respectively, as shown in fig. 5.
The static water supply chambers are main body parts of the water tank, occupy 3 cavities (A-C shown in figure 5), are connected with each other by multi-stage triangular weirs 15 with different elevations, lift the triangular weir laminated beam plate 10 to different water level heights through the lifting control unit 9, automatically start different numbers of static water supply chambers, namely start 1 water supply cavity with low water head and small flow, start 2 water supply cavities with medium water head and start all 3 water supply cavities with high water head and large flow. Specifically, as shown in fig. 5, the water chamber range can be adjusted according to the water level in the tank required by the test, so that the requirement for ensuring sufficient water supply according to different test working conditions is met, the water supply can be reduced when the small flow demand is met, and the water resource is saved. When the water level in the tank is less than 1.0m, the starting range is a water supply chamber A; 1.0-1.5m, the starting range is the water supply A + B chamber; 1.5-2.0m, and the starting range is the water supply A + B + C chamber, namely the water tank is completely started. Can reach the sound subregion, stabilize into water, reduce the undulant effect of water tank surface of water, can accurately satisfy different experimental demands again, reduce the use of water resource. Multiple openings are arranged at intervals of 0.5m in the elevation range of the water tank, and organic glass windows 19 (shown in figure 2) are arranged so as to better observe the conditions in the tank.
The multistage booster pump 4 is arranged in the middle of a water pipeline 6 with the diameter of 5cm and used for boosting a water source to pump water into the overflow water supply tank 18 and controlling the water pump to start and stop through electronic signal feedback. The bottom of the static water supply chamber is connected with a radial inflow device through a PVC steel wire hose 20 with the diameter of 8cm, corresponding pressure water flow enters a test model container 24, and excess water quantity overflows into an overflow drainage chamber through a triangular weir laminated beam plate 10 and then is discharged through an overflow pipeline 3. Meanwhile, a flowmeter 5 is arranged at the position of the overflow pipeline 3, and the power of the water supply multistage booster pump 4 is automatically adjusted according to a flow feedback signal of the abandoned water to the control terminal 2 of the multistage booster pump.
The test model container comprises an inner cylinder 26 with an opening at the upper end, the inner cylinder 26 is of a steel cylindrical cavity structure with the diameter of 100cm and the height of 220cm, the underground buried depth is 110cm, a sand layer is filled, the ground is exposed for 110cm, the lower part is 60cm, a clay layer is filled, and the upper part 50cm is a water containing cavity which is fixed by screws and can be detached, namely a drainage layer. A declination water outlet 23 which is 10cm long and 5cm wide and extends 15cm is arranged at the upper part of the test model container 24 and is used for controlling the downstream water level. The inner cylinder 26 is used as the container wall of the test model container, permeable holes with the diameter of 1cm and the distance of 1cm are uniformly formed in the container wall to form an inner cylinder porous wall 41, before sample loading, structural adhesive is coated on the water inlet part, namely a sand layer, of the test model container from top to bottom, and 2 layers of 80-mesh nylon gauze 42 are laid to prevent fine sand particles from losing from the side wall.
The periphery of the inner cylinder 26 is provided with an outer cylinder 39, the upper end of the outer cylinder 39 is flush with the upper end of a sand layer, the bottom end of the outer cylinder 39 and the bottom end of the inner cylinder 26 are separated by a certain distance to form a grit chamber 31, the radial inflow device comprises a space formed by the outer cylinder 39 and the inner cylinder 26 in an enclosing manner, the space is attached to the outer ring of the corresponding sand layer of the test model container, and the distance between the inner layer and the outer layer is 10cm and is used as an inflow chamber of a soil sample (a corresponding expansion diagram is shown in fig. 6). The upstream water of the simulated dike foundation extends into the bottom of the water inlet chamber through the pipeline, the pipeline is uniformly injected with water through the water inlet holes 28 formed in the inner wall of the outer cylinder 39, the diameter of each water inlet hole is 1cm, and water flows towards the wall of the outer container, namely the inner side wall of the outer cylinder 39, so that a sandy soil layer is prevented from being washed away, and the water flows into the water chamber and then permeates into a soil body in an annular radial flow mode. The bottom is a grit chamber 31, and a valve 45 of a sand outlet is reserved on the outer side of the bottom so as to discharge sand entering the water inlet chamber in the test process. A high-precision flowmeter 27 is arranged at a water inlet of the radial inflow device, the pore volume among solid particles is calculated according to the density and the porosity of filled soil, the soil is continuously saturated by controlling the water inlet volume for several times, and two exhaust valves 26 are arranged at the upper part of the annular inflow device for exhausting air in pores of the soil in the saturation process.
A circular hole with the same size as the pipe diameter of the pressure reducing well pipe is reserved in the bottom plate of the inner cylinder 36, and when the soil breaking cone 29 at the front end of the pressure reducing well is driven into the desilting basin 31, the pressure bearing complete well is formed; when the oil well is not driven into the grit chamber 31) is a pressure-bearing incomplete well, the round hole can be sealed by a slightly larger steel plate, and the sleeper 30 is reserved at the bottom of the test model container 24 to play a role in protection.
The digital pressure measuring device comprises filter heads 40, an air pressure pipe 44, an osmometer 37 and a pressure sensor 38, wherein the filter heads 40 are arranged in a sand layer and a clay layer at certain intervals, the filter heads 40 in the clay layer are connected with the osmometer 37 through the air pressure pipe 44, the osmometer 37 is adopted to prevent a hysteresis effect, and the filter heads 40 in the sand layer are connected with the pressure sensor 38 through the air pressure pipe 44 so as to observe the water head pressure at corresponding positions in real time. The filter head 40 adopts a copper pipe with the length of 3cm and the diameter of 6mm, the copper pipe is uniformly perforated and is wrapped with 2 layers of 80-mesh nylon gauze, and the other end of the copper pipe penetrates through a preformed hole of the cylinder wall to be connected with an air compression pipe 44.
The implanted power device comprises an electric lifter 21, a screw rod 32 and a circular stressed platform 35, wherein the electric lifter 21 is installed right above the middle of the test model container 24 through an angle steel truss 34, the electric lifter 21 is used for driving the screw rod 32 to be connected with the double-layer pressure reducing well pipe device 33 through the circular stressed platform 35 so as to continuously provide power for pressing soil into the double-layer pressure reducing well pipe device 33, and the top view of the implanted power device is shown in fig. 7.
The circular stress platform 35 is arranged at the tail end of the screw rod 32, and the circular stress platform 35 is in threaded connection with a hammering seat of the double-layer decompression well pipe device 33, so that the electric elevator 21 can simulate the decompression well pressing-in process and can drive the well pipe to be lifted after the test. The implanted power device is welded right above the test model container through an angle steel truss 34, the position of the screw 32 applying pressure is in the middle of the test model container, and the self transmission of the screw 32 is limited through the limiter 22.
The embodiment of the invention also provides an implanted relief well radial well flow test method which is carried out by adopting the implanted relief well radial well flow test system, and the method comprises the following steps:
1) selecting a test site, and simulating a working environment suitable for a pressure reducing well pipe and a matched device thereof according to hydrogeological data of piping dangerous situations in a research area;
2) preparing a sample, namely preparing the selected sand sample and clay sample, and spraying, mixing and preparing the sample according to a certain water content (sand is 7% and clay is 20% in the test); a gauze 42 is laid at the lower part of the test model container 24, namely the water inlet section, so that fine sand particles are prevented from leaking from the opening of the side wall; the sample loading density is controlled by adopting a layered loading method, the loading height of each layer in the test is 10-15 cm, the sand soil layer is filled for 110cm, the clay layer is filled for 60cm, and the sample loading density is 1.4g/cm 3 Thereby realizing the simulation of the binary embankment group;
3) for the test scheme of the implanted decompression well, an implanted decompression well pipe device is vertically erected at the center of a model, and a fixing device and an implanted power device are installed. The motor-driven elevator 21 is started and the double-layer pressure-reducing well pipe assembly 33 is pressed into the simulated binary dike foundation. The method comprises the following specific steps: firstly, an outer well pipe containing an inner well pipe punctures a foundation clay layer, a power device is stopped being implanted, and an outer pipe hammering device is taken down; mounting an inner well pipe and outer well pipe rotating separation assembly, separating the inner well pipe and the outer well pipe by shifting the cylindrical bayonet on the clamping groove, and continuously fixing the separated outer well pipe in a clay layer; thirdly, the inner well pipe is extended through threaded connection, and then the implanted power device is started to drive the inner well pipe into the sand layer until the preset depth is reached; when the soil breaking cone 29 at the lower end of the double-layer pressure reducing well pipe device 33 is deep to the sleeper 30 in the grit chamber, the pressure-bearing complete well is formed; when the well pipe conical head 29 is not driven into the grit chamber, the well is a pressure-bearing incomplete well;
4) after the preparation of the model is finished, opening a water inlet valve 46 on the PVC steel wire hose 20 to saturate with water, because the filling position of the sand sample is underground, the sand sample is saturated by adopting a water quantity control mode through a flow meter 27, and the clay sample is saturated by gradually increasing the upstream water level;
5) the upstream water head is lifted step by step, the water head control device controls the triangular weir stop log plate 10 to accurately lift the water level in the static water supply chamber, the range of the static water supply chamber is gradually enlarged, the test phenomenon and the water level change condition of the piezometer tube are observed, the water level of the piezometer tube 16 is recorded, the flow of the water outlet 23 is measured at the same time, the test phenomenon is photographed, and the water head is lifted continuously after the measured value is stable to enter the next stage of water head test;
6) in the test, the design parameters of the relief well device are tested by adopting a pump-free gravity flow mode, the foundation is in a high pressure bearing water state along with the rise of an upstream water head, the drainage and pressure reduction effects of the relief well are continuously tested by adopting a multi-stage water suction pump to pump water, and a basis is provided for improving the design parameters of the relief well. And closing the water inlet valve 46 after the data acquisition is finished or the sample is damaged, ending the test, and preparing the next test after the sample is disassembled.
The distribution of the confined water heads on the clay bottom surface is uniformly distributed in a horizontal straight line manner and is a model upstream acting water head when the relief well is not available; when having the relief well, the confined water head of clay bottom surface distributes and is leaks hopper-shaped, and peripheral confined water head is high, for model upstream effect flood peak, is close to the relief well confined water head more and is lower, for model downstream flood peak (as shown in fig. 8), and this kind of distribution makes the whole pressure head that bears of clay improve, and the ability reinforcing that the infiltration was destroyed is resisted to the soil body.
The invention can provide the implanted power through the motor during the test to quickly form a well in a test model container in a soil squeezing mode, provides the water pressure simulation flood season piping dangerous case through the graded overflow water supply device to realize the drainage pressure reduction effect of the implanted relief well self-flowing and the pumping when the flood season piping dangerous case occurs, really reduces the whole process of the implanted relief well emergency rescue under the binary foundation structure and various parameters such as the depth reduction and the unit depth reduction flow which can be achieved by the implanted relief well during the simulation flood season piping dangerous case, proves the practicability of the implanted relief well in the flood season rescue, and also provides exact reference for further researching the integrated relief well emergency rescue equipment capable of being quickly assembled and constructed and improving the emergency rescue capacity of the implanted relief well.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. The utility model provides a radial well flow test system of implanted relief well which characterized in that: the device comprises a graded overflow water supply device, a radial inflow device, a test model container, a digital pressure measuring device, an implanted power device and a double-layer pressure reducing well pipe device;
the graded overflow water supply device comprises a water source valve (1), a multistage booster pump control terminal (2), an overflow pipeline (3), a multistage booster pump (4), a water pipeline (6), an overflow water supply tank (18) and a water head control device, wherein the multistage booster pump (4) is controlled by the water source valve (1) and the multistage booster pump control terminal (2), water is pumped into the overflow water supply tank (18) through the water pipeline (6), the water head control device comprises a triangular weir laminated beam plate (10) and a lifting control unit (9) for controlling the triangular weir laminated beam plate (10) to automatically lift, and the lifting control unit (9) controls the lifting of the triangular weir laminated beam plate (10) to control the water level of the overflow water supply tank (18);
the test model container (24) is used for filling a test soil sample, and the test model sequentially comprises a sand layer, a clay layer and a detachable drainage layer from bottom to top;
the radial inflow device is connected with the overflow water supply tank (18) through a PVC steel wire hose (20), is attached to the outer ring of the test model container (24) in a surrounding manner, and is used for providing uniform and stable radial inflow for the test model container (24);
the digital pressure measuring device is used for monitoring the water head pressure of the corresponding height positions of the clay layer and the sand layer in the test model container (24) in real time;
the implanted power device is used for providing power to press the double-layer decompression well pipe device (33) into the binary structure soil body of the test model container (24).
2. The implantable relief well radial well flow testing system of claim 1, wherein: overflow feed water tank (18) internal separation is for developments intake chamber, static water supply chamber and overflow drainage room, and wherein developments intake chamber and overflow drainage room seal and separate, and static water supply chamber separates for at least three water supply chamber, and the dynamic intake chamber uses perforated plate (7) intercommunication with adjacent little water supply chamber, separates through triangle weir superposed beam board (10) between adjacent water supply chamber of dynamic intake chamber and the overflow drainage room, connect through triangle weir steel sheet (15) of different elevations between the at least three water supply chamber, and the dynamic intake chamber is used for receiving the intaking of multistage booster pump (4) suction, and surplus water capacity is folded beam board (10) overflow by triangle weir, discharges through overflow pipeline (3).
3. The implantable relief well radial well flow testing system of claim 1, wherein: the triangular weir laminated beam plate (10) is an extensible laminated beam plate formed by sequentially connecting a plurality of steel plates on the lower part of an upper triangular weir through hinges (47), and water is sealed between the hinges (47) through a water-sealing strip (48).
4. The implantable relief well radial well flow testing system of claim 1, wherein: the water head control device comprises a lifting control unit (9), an electric lifter (11), an infrared electronic distance meter (12), a fixed pulley (13) and a steel cable (14), wherein one end of the steel cable (14) is connected with the triangular weir overlapping beam plate (10), and the other end of the steel cable is connected with the electric lifter (11) after bypassing the fixed pulley (13); the infrared electronic distance meter (12) is arranged at the top of the overflow water supply tank (18) and used for distance measurement and water tank level identification, and the lifting control unit (9) is used for controlling the lifting control unit (9) to lift the triangular weir laminated beam plate (10) to reach the required water tank level according to the water tank level detected by the infrared electronic distance meter (12).
5. The implantable relief well radial well flow testing system of claim 1, wherein: the digital pressure measuring device comprises filter heads (40), an air pressure pipe (44), an osmometer (37) and a pressure sensor (38), wherein the filter heads (40) are arranged in a sand layer and a clay layer at certain intervals, the filter heads (40) in the clay layer are connected with the osmometer (37) through the air pressure pipe (44), and the filter heads (40) in the sand layer are connected with the pressure sensor (38) through the air pressure pipe (44).
6. The implantable relief well radial well flow test system of claim 1, wherein: the test model container (24) comprises an inner cylinder (26) with an opening at the upper end, the inner cylinder (26) is a steel cylindrical cavity with the diameter of 100cm and the height of 220cm, the underground buried depth is 110cm, the inner cylinder is a sand layer and is exposed on the ground by 110cm, the lower part of the inner cylinder is a clay layer, the upper part of the inner cylinder is a detachable water containing cavity which is the drainage layer, and the upper part of the water containing cavity is provided with an inclined water outlet (23) for controlling the downstream water level of the test system.
7. The implantable relief well radial well flow testing system of claim 6, wherein: inner tube (26) periphery is equipped with urceolus (39), and the upper end and the sand layer upper end parallel and level of urceolus (39), the bottom and inner tube (26) bottom interval certain distance of urceolus (39) form grit chamber (31), the container wall of experimental model container is regarded as in inner tube (26), evenly offers porous wall of infiltration hole formation inner tube (41) on the container wall, radial inflow device includes urceolus (39) with inner tube (26) enclose establish the space that forms, be located the space and with the pipeline of PVC wire hose (20) intercommunication the hole of permeating water of seting up on inner tube (26), the cavity between urceolus (39) and inner tube (26) is vertically located to the pipeline, and the pipeline is opened water inlet (28) towards urceolus (39) inner wall with even water injection.
8. An implantable relief well radial well flow test method is characterized by comprising the following steps: the method of using the implantable relief well radial well flow assay system of any one of claims 1-7, the method comprising the steps of:
1) selecting a test site, and simulating a working environment suitable for a pressure reducing well pipe and a matched device thereof according to hydrogeological data of piping dangerous situations in a research area;
2) preparing a sample, namely preparing the selected sand sample and clay sample, and spraying, blending and preparing the sample according to a certain water content ratio; a gauze (42) is laid at the lower part, namely the water inlet section, of the test model container (24) to prevent fine sand particles from leaking from the opening of the side wall; the sample loading density is controlled by adopting a layered loading method, the loading height of each layer is 10-15 cm, the sand layer is filled for 110cm, the clay layer is filled for 60cm, and the sample loading density is 1.4g/cm 3 Thereby realizing the simulation of the binary embankment group;
3) for the test scheme of the implanted pressure-reducing well, an implanted pressure-reducing well pipe device is vertically erected at the center of a model, a fixing device and an implanted power device are installed, an electric elevator (21) is started, and a double-layer pressure-reducing well pipe device (33) is pressed into a simulated binary embankment base;
4) after the preparation of the model is finished, opening a water inlet valve (46) on a PVC steel wire hose (20) and adding aerated water for saturation, saturating a sand sample by a flow meter (27) arranged at a water inlet of a radial inflow device in a water quantity control mode, and saturating a clay sample by gradually increasing the upstream water level;
5) lifting an upstream water head step by step, controlling a triangular weir laminated beam plate (10) to lift the water level in a static water supply chamber by a water head control device, gradually enlarging the range of the static water supply chamber, observing the test phenomenon and the change condition of the water level of a piezometer tube, recording the water level of the piezometer tube (16) arranged at the outer side of an overflow water supply tank (18), measuring the flow of a water outlet (23), photographing the test phenomenon, and continuously lifting the water head to enter a next-stage water head test after the measured value is stable;
6) the design parameters of the relief well device are tested in a pump-free self-flowing mode at the beginning of the test, the foundation is in a high pressure water-bearing state along with the rising of an upstream water head, the water suction pump is adopted to pump water to continuously test the drainage and pressure reduction effects of the relief well, the water inlet valve (46) is closed after the data acquisition is completed or the sample is damaged, the test is finished, and the next test is prepared after the sample is dismounted.
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| CN115921511A (en) * | 2023-02-27 | 2023-04-07 | 宝航环境修复有限公司 | Method for accurately detecting, extracting and repairing LNAPL pollution source in underground water |
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