CN103046528A - Vertical well pipe for assisting in efficiently extracting groundwater in low permeable aqueous medium in laboratory and usage method of vertical well pipe - Google Patents
Vertical well pipe for assisting in efficiently extracting groundwater in low permeable aqueous medium in laboratory and usage method of vertical well pipe Download PDFInfo
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- CN103046528A CN103046528A CN201310001457XA CN201310001457A CN103046528A CN 103046528 A CN103046528 A CN 103046528A CN 201310001457X A CN201310001457X A CN 201310001457XA CN 201310001457 A CN201310001457 A CN 201310001457A CN 103046528 A CN103046528 A CN 103046528A
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Abstract
The invention discloses a vertical well pipe assisting in efficiently extracting groundwater in a low permeable aqueous medium in a laboratory and a usage method of the vertical well pipe. With an ordinary well pipe improved, a rubber plug with two holes are added on a nozzle, and one hole serves as an air inlet and outlet port while the other hole serves as an insertion hole for an pumping hose. The inner portion of a porous pipe part positioned on the lower portion of the well pipe is of the structure of double layers, and washing cotton is used for filling the inner portion of a cylindrical ring while macroporous membrane is used for being stuck on an inner ring. The outer portion of the porous pipe is distributed with pores unevenly and asymmetrically. When the well pipe is vertically arranged, owing to symmetric distribution, water flow is fast due to the effect of groundwater flow; owing to the asymmetric distribution, cumulative amount in pumping can be increased, flow rate can be reduced, area of the water contact surface is expanded, pressure is increased, and therefore the siphon effect of the hose is improved.
Description
Technical field
The invention belongs to the ground water regime technical field, more particularly, relate to the vertical well casing of ground water regime desk research device and install and use technical field.
Background technology
Because the impact of the many factors such as field conditions, condition, equipment, construction costs, comfort level; often use indoor simulation device and simulate the Groundwater Flow situation in a zone; with approximate this regional water quantity and quality situation of research; current and solute are carried out numerical simulation; when research, need to carry out sample analysis to the water quality in the water-bearing media; when water-bearing media is the coarse granule medium such as coarse sand, use the general vertical well casing in small-bore (pvc pipe) to cooperate the wriggling suction pump disposable extraction to be used for the water yield that GB is analyzed requirement of experiment.But, in the zone that coastal region especially reclaiming land around sea forms, compose of aquifer is stored in the Quaternary system opaque more, in the low osmotic mediums such as Muddy Bottoms, study the water quality in such medium and pollute the solute transfer situation significant for the coastal seawater situation of littoral zone ground water regime and close relation, but at indoor two dimension or the three-dimensional undisturbed soil current of carrying out, during the solute transfer simulated test, because media particle is very little, the tax water-based is poor, be difficult to extract the water sample test out with conventional vertical well casing, bring very large difficulty to research work, the cost of laying probe is very high again, therefore, needs a kind of economic and practical vertical well casing use for deliberation of invention.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, transforms conventional vertical well casing, to increase and to accelerate to extract in two dimension or the three-dimensional simulating lab test underground water demand in the low-permeability water-bearing medium, for experimental study.
The technology of the present invention purpose is achieved by following technical proposals:
A kind of for vertical efficient well casing and the using method that extracts low-permeability water-bearing medium underground water in laboratory, as follows specifically:
Well casing by laboratory common PVC well casing commonly used is improved, is provided with double-hole rubber plug at an end opening place of described well casing, and a hole is as inlet, outlet; A hole is as the suction hose patchhole.
Be provided with the floral tube section in the bottom of described well casing, arrange porosely on the exterior periphery of the well casing of described floral tube section, preferably make uneven and, asymmetric poroid distribution.Because there is a groundwater flow direction, the symmetrical expression distribution can cause the flow velocity of water fast, by contrast after vertical the placement, mal-distribution can increase cumulant when drawing water, slow down flow velocity, but also increased the area of the contact water surface, thereby increase the siphonage that pressure increases flexible pipe self.
Well casing inner circumferential in described well casing bottom floral tube section is provided with the water accepting layer torus, and inside is filled with absorbent material, and outer wrap has filter membrane, to play permeable and a group water-bearing media effect.
Be provided with filtration beds in the bottom of well casing floral tube section and seal, filtration beds upper wall macropore rigid plastics, lower wall aperture rigid plastics, the upper and lower opening aperture size is as the criterion with the coarse sand of putting into, the middle large aperture sand grains of placing.
Internal diameter Φ=the 14mm of described pvc pipe; Suction hose uses the 16# flexible pipe supporting with peristaltic pump; Floral tube section mesh aperture: 2mm arranges height: 5cm, and pitch of holes: 3-7mm arranges at random; Aspirating hole aperture: 5mm; It is inner and be drawn out of that the filter membrane aperture 20 μ m of absorbent material layer parcel, thick 80 μ m, the water-bearing media that can prevent the side enter well casing; Floral tube bottom filtration beds floor height: 2cm, upper wall large aperture: 3mm, lower wall small-bore: 1mm, upper lower wall surface is made of rigid plastics; The middle coarse sand granule of filling, about particle diameter 2-4mm, greater particle size is filled in first the bottom, uses afterwards than small particle diameter and fills.Can play like this that to prevent that well casing lower end water-bearing media from entering well casing inner and extracted out by drinking-water pipe.
With respect to prior art, the present invention has following advantage and effect:
1, in test experiments, finds to compare with the PVC well casing of common vertical insertion, the rate of drawing water is increased to 25ml/min from 5ml/min, successful draws water, and the water of extracting out is more much lower than the turbidity of common well casing, the degree that the low osmotic medium that greatly reduces enters water sample has guaranteed the cleaning of water sample.
2, after well casing bottom adds the feud of filling coarse sand of one section 2cm thickness, the bottom is difficult for by filter medium clogging, and certain filter effect is arranged.
3, the absorbent wool suction is saturated vacuumizes by well casing afterwards, can comparatively fast recover water absorbing capacity, can continue to use.
4, there is the capillary suction function in the small hose that draws water in well casing inside, does not need the external force water sample that to a certain degree rising is namely arranged.
Above-mentioned well casing is used for artificial bank band pollutant Transport And Transformation indoor simulation device, and as pre-buried well, structure is as follows specifically:
Artificial bank band pollutant Transport And Transformation indoor simulation device comprises reactive tank, Simulation of Precipitation device, wave generator, wherein:
The two ends of described reactive tank are separated out respectively groove head, groove body and three parts of groove tail by dividing plate, its middle slot is first to link to each other with fresh water feed system, sea water supply system respectively with the groove tail, and realizes the real-time monitoring of side direction water level and flow rate of water flow by tank gage and adjusting device.
Described groove body position is filled with soil horizon, and in the filling process, be preset with the pre-buried well of different depth, described pre-buried well adopts above-mentioned improved well casing structure, can test wherein pollutant and other indexs by extracting liquid in the pre-buried well, for the later stage numerical simulation provides the data basis; Described pre-buried well is 3 row, 8 row, amounts to 24.
Described wave generator links to each other with the sea water supply system, controls by control device, thereby reflects that truly wave is on the impact of degree of saltiness water mutual effect.
Described Simulation of Precipitation device is arranged on the top of analogue means, realizes that by spray equipment and control device control flow research precipitation is on the impact of pollutant Transport And Transformation.
From groove head, groove body to the groove tail, along the flow direction, settle respectively linker in the trip of the upper, middle and lower of device one side, by the height of water level of linker reaction unit inside.
Described dividing plate is with porose poly (methyl methacrylate) plate, and adopts braid to cover, and penetrates soil with fresh water, the seawater of implement device both sides and in soil reciprocation occurs and prevent the soil clogging intake-outlet.
Described reactive tank framework is selected the thickening corrosion resistant plate, for example 340 type stainless steels.
Then analyzing facing-port industry district, the Tianjin geotechnical investigation report of Prologis can find: at economic zone, from the upper soll layer to the upper soll layer below ten meters be respectively plain fill (0～0.5m height), dredger fill (0.5～5.5m height), silt clay (5.5～8.7m height), silt (8.7～10.5m height).Plain fill and dredger fill are barged-in fill, and it is 6m highly altogether, and this two-layer soil is the soil layer construction that is formed by barged-in fill; Silt clay and silt are the original substrate soil layer construction of bank body.The following soil layer construction of 10m has silt clay, silty clay, silt, silty clay, clay etc., considers that from the angle of hydrogeology its effect is mainly the water proof base plate.According to geometrical similarity principle, based on the earth formation in Tianjin facing-port industry district, in the indoor physical simulation device, banket as follows:
Based on actual conditions and this experiment condition of economic zone, to ten meters soil layer construction below the top layer, the corrosion resistant plate of device bottom can play the water proof base plate effect of soil layer construction below ten meters to indoor set institute fill stratum with top layer in the Reality simulation situation.To determine 4 soil layers that device is filled out after the actual soil layer scaled down: the device bottom highly loads silt to 20cm, 20cm～50cm loads silt clay, 50cm～120cm filling dredger fill, 120cm～140cm load plain fill, and soil layer construction as shown in Figure 3.
For the soil structure of real simulation place, fetching earth is selected from casual labourer industrial occupancy, Tianjin, and according to the geotechnical investigation report, the type that fetches earth mainly is divided into silt clay, silty clay, silt and sandy soil.Fetch earth and first soil is exposed to the sun after finishing, as far as possible indigenous microorganism is removed, remove the impurity of sneaking in the soil by screening, then soil is pulverized in order to filling.Add first the water yield of half degree of depth before banketing in device, whether verifying attachment leaks.After finishing, leak detection bankets, in order to make the device water level connecting pipe really reflect the height of phreatic table in the device, spread the thick coarse sand of 5cm at the device bottom first, segment interface connects the centre position that pvc pipe inserts bottom sand at the bottom of the water level connecting pipe, wrap up in gauze (anti-clogging) at the pvc pipe end, load silt at coarse sand, loading height is 20cm, is considered as first floor soil; The second layer is silt clay, loading height 30cm; The 3rd layer is dredger fill, and the soil that fills is the composite soil of silt clay, shell soil, silty clay, and mixed proportion is 1: 1: 1, and loading height is 70cm; The 4th layer is plain fill, and its main component is building debris, and top covers with fine sand, and loading height is 20cm.In whole filling process, for guarantee to banket evenly, the people is not for causing soil crack, when every interpolation soil layer 20cm, tamp, and cloth spills tap water, leave standstill a period of time after, make its natural subsidence, and then earth filling tamping, this process repeatedly is until the 20cm soil layer is unchanged, carry out again lower one deck filling, until load complete.After the soil filling is complete, water flowing a period of time, confirm soil layer without sedimentation, determine that finally the soil layer packed height is 1.4m.Banketing arranges pre-buried well after finishing therein, and the pre-buried well of a row is set in this research method, and it highly is set to 100cm.For the ease of sampling, can in pre-buried well, insert flexible pipe, the flexible pipe other end extends outside the well by rubber tube, and by the peristaltic pump pumps water sample, pre-buried well number consecutively is 1-8 number from left to right, as shown in Figure 2.
The 3rd the step, banket finish after, the beginning water filling.In order to simulate as far as possible really the actual conditions in facing-port industry district, Tianjin, analyze the water quality in artificial bank band hydraulic reclamation district, and then the configuration aqueous solution injects underground water and the seawater of preparation separately at the intake-outlet end of device.In this research method, control fresh water water inlet end height of water level is 120cm, and salt water brings out mouth of a river 80cm.Determine by the flow that determines the mouth of a river whether water level is stable.
Behind stable level, take soil sample at the indoor physical simulation device, soil sample is carried out the lixiviate experiment.Analyze and find that artificial bank band hydraulic reclamation regional soil nutrient concentrations is abundant.Therefore, the soil of artificial bank band will and underground water and salt water between complicated geochemical alteration will occur, and then polluted underground water and coastal seawater, so need to analyze with regard to its Transport are for next step underground water repair lays the foundation.
For the true truth of the artificial bank band in Tianjin facing-port industry district, a stainless steel water tank has just been fixed with triangle by the 30cm place above device, be evenly distributed 8 shower nozzles of two rows below water tank, nozzle connecting upper rotor part flow meter is by control uninterrupted and spout size simulated rainfall process.Amount of precipitation in this method research above the control device is 10mm.For the impact of actual response wave on the Transport of pollutant, in this experiment, the range of wave maker is 15cm, and maximal rate is 38cm/s, and maximum load power is 1200W, maximum water depth 0.6m, and maximum wave height 0.2m, wave period are 1.5s
After each Variable Control of physical simulating device, extract water sample by peristaltic-type pump arrangement shown in Figure 2 and analyze.Carry out the lixiviate experiment by the soil to the facing-port industry district and find that nutritive salt is relatively high, determine in this method research that therefore the nutritive salt in the device is the feature pollutant.In order to probe into the Transport of various form nitrogen on the fresh-saline water interface, this experiment utilizes the water sample in the same depth-sampling of the peristaltic pump pumps hole along Groundwater Flow direction in the analogue means, and the pre-buried well of getting is pre-buried well among the figure, amounts to 8.5 cycles are measured in survey in five days altogether, measure the nitrogen concentration of the various forms in the water sample.
For reaching the real simulation to artificial shore littoral zone, projecting point main manifestations of the present invention is following three aspects.
1, on the side direction supply direction of three dimensional fluid flow groove, the fringe conditions of flow one side recharge groundwater simulation place Groundwater Flow, the seawater of the solutions simulate shore littoral zone of opposite side supply rational proportion, the reciprocation of degree of saltiness water have been realized Hai Lushui interactional real simulation.
2, acquire wave generator in seawater one side of flow, according to the control of control principle realization seawater one side wave wave cycle of oscillation and amplitude, the cycle of oscillation and the amplitude that change wave can realize that wave is on polluting the impact research of Transport And Transformation among the extra large Lu Shui.
3, external source pollution sources release is arranged in this three-dimensional reactor top, realizes the research of different pollutant Transport And Transformation rules.
For the artificial shore of real simulation littoral zone pollutant Transport And Transformation, at first consult the related data such as hydrogeology of place and carry out open-air on-the-spot investigation in the place, according to geometrical similarity principle the place is reduced into the indoor physical simulation plant bulk.Consider in the physical simulating device and to fill soil to the high pressure of device, therefore make this analogue means with poly (methyl methacrylate) plate, and in the both sides of device intake-outlet is set respectively that water inlet is connected with Height Adjustable linker.Settle respectively near inlet end in the device both sides with holes to cover poly (methyl methacrylate) plate with braid, thereby the fresh water of implement device both sides, seawater penetrate soil and in soil reciprocation occur and prevent the soil clogging intake-outlet.Along the flow direction, settle respectively linker in the trip of the upper, middle and lower of device one side, by the height of water level of linker reaction unit inside.Hydrogeological conditions and soil layer construction according to the simulation place banket in device, and external source is set above soil movably pollutes release, simulate the Transport And Transformation rule of different pollutants in the littoral zone of artificial shore, the pre-buried well of different depth is set in soil along the flow direction simultaneously, can test wherein pollutant and other indexs by extracting liquid in the pre-buried well, for the later stage numerical simulation provides the data basis.In order truly to reflect the condition of raining of place, above device, spray equipment is set, by controlling its flow research precipitation to the impact of pollutant Transport And Transformation.What is more important, this analogue means is mainly used in simulating artificial shore littoral zone, and therefore therefore reciprocation between main consideration degree of saltiness water once settles wave generator at the seawater of device, by control device control power set, thereby reflect that truly wave is on the impact of degree of saltiness water mutual effect.Therefore, this analogue means is on the basis of the plumbing condition of considering adjustable side direction, top, take into full account reciprocation between external source pollution, the degree of saltiness water and the impact of wave, can accurately reflect to a certain extent the Transport And Transformation rule of pollutant in the littoral zone of artificial shore.
Employing apparatus of the present invention can realize the physical analogy of artificial shore littoral zone to the full extent, the littoral zone place, artificial shore of large scale are reduced into the indoor physical simulation device of small scale under the guidance of geometric similarity theory.Considered the combined influence of adjustable height of water level, the interaction between freshwater and seawater, wave, precipitation and xenobiotic pollutants, guaranteed the real simulation of artificial shore littoral zone, for manually the numerical simulation of strand bank band and the pollution control in later stage are laid a good foundation.The research method of employing this patent can be at indoor structure physical simulating device under the guidance of geometric similarity theory, determine the feature pollutant type of artificial bank band according to soil lixiviate experiment, and the method for data coupling Mathematical Modeling is determined the Transport of artificial bank band feature pollutant by experiment.
Description of drawings
Fig. 1 is indoor physical simulation device sectional drawing, among the figure 1: fresh water water inlet tank gage, 2: organic glass groove, 3: soil, 4: the fresh water water level, 5: sea level fluctuations, 6: seawater water inlet tank gage, 7: pollution sources discharge box, 8: the Simulation of Precipitation device, 9: wave generator, 10: fresh water brings out the mouth of a river, and 11: seawater brings out the mouth of a river.
Fig. 2 is the pre-buried well schematic diagram of indoor physical simulation device.
Fig. 3 is indoor physical simulation device soil layer construction figure.
Fig. 4 is indoor physical simulation device dividing plate schematic diagram.
Fig. 5 is artificial bank band pollutant Transport And Transformation indoor simulation device overall design drawing.
Fig. 6 is the common vertical PVC well casing in laboratory, 12-PVC plastic pipe among the figure.
Fig. 7 is novel well casing vertical cross section figure (thickness of pipe is ignored), 13-perforated rubber stopper among the figure; The 14-aspirating hole; 15-suction hose (16#); 16-well casing bottom floral tube section; 17-water accepting layer (absorbent wool); 18-macropore filter membrane; 19-filtration beds upper wall; 20-filters intermediate layer (sand grains); 21-filtration beds lower wall.
Fig. 8 is that novel well casing floral tube section is launched rear plan view, inhomogeneous, asymmetrically distributed little mesh on the 22-floral tube section among the figure.
Fig. 9 is novel well casing bottom filtration beds lower wall surface, the aperture among the figure on the 23-filtration beds lower wall surface.
Figure 10 is novel well casing bottom filtration beds upper wall surface, the macropore among the figure on the 24-filtration beds upper wall surface.
The specific embodiment
Further specify technical scheme of the present invention below in conjunction with specific embodiment.
This artificial bank band pollutant Transport And Transformation indoor simulation device adopts the thick poly (methyl methacrylate) plate of 10mm to build, and analogue means is of a size of: length * wide * height=4.2m * 0.9m * 1.5m.Respectively be provided with dividing plate with holes (as shown in Figure 1) at distance fresh water mouth water inlet and seawater water inlet 20cm place, dividing plate is the thick organic glass of 10mm (as shown in Figure 4), dividing plate one side covers braid, and whole physical simulating device is divided into groove head, groove body and three parts of groove tail.Side direction at device respectively is equipped with a tank gage, can realize the real-time monitoring (as shown in Figure 1) of side direction water level and flow rate of water flow by the arrangement for adjusting height of regulating the linker below.Flow direction at device is equipped with linker, the height of water level of each point (as shown in Figure 5) in the real time monitoring apparatus.This device is at the indoor Assembling that carries out.
Before inside bankets, at first analyze the geotechnical investigation report of bank band simulation place, artificial strand at device, according to geometrical similarity principle the place of large scale is reduced into indoor physical model.For simulating pollution thing accurately at the migration rule of fresh-saline water interface, the inner institute of this device bankets and takes from hydraulic reclamation scene, facing-port industry district, Tianjin, fetch earth and at first soil is exposed to the sun, screens out impurity after finishing, the soil that dries is sieved, pack into after the screening groove body of seepage tank, the compacting of sprinkling water while banketing in filling process finally fills into as shown in Figure 1 shape.Simultaneously, three row's pre-buried wells (as shown in Figure 3) are set in soil in the process of banketing, correspond to respectively three height, pre-buried well profile figure as shown in Figure 2 in the soil.Banket finish after, the fresh water mouth water inlet water-filling at seepage tank monic end flows out from delivery port so that fresh water penetrates soil.Measure the flow velocity at the mouth of a river, after the delivery port Water discharge flow speed is constant, inject salt water in the seawater inlet end, close the fresh water end, seawater brings out the mouth of a river, guarantees that the height of water level of fresh water end is that 1.2m seawater end liquid level remains on 0.8m.
In order to realize effectively simulating the current supply adjusting of artificial shore littoral zone, above device, be provided with the ejecting device of precipitation.In this device, a stainless steel water tank has just been fixed with triangle by the 30cm place above device, is evenly distributed 8 shower nozzles of two rows below water tank, and nozzle connecting upper rotor part flow meter is by control uninterrupted and spout size simulated rainfall process.The water tank top links to each other with running water pipe, guarantees that the Water in Water Tanks amount is sufficient, and the amount of precipitation of spray is 10mm.Wherein shower nozzle is made by this valve Co., Ltd of Tianjin ENI, with the anthropomorphic worker's rainfall of low-cost die; Spinner flowmeter is that Dongxing, Dongtai City instrucment and meter plant produces, and model is LZB-10, to show water flow.
After more than device is built and finished, settle the push-plate type wave maker in the salt water end slot tail position of device.This wave maker is selected driven by servomotor, adopts digital low inertia alternating current servo motor direct to connect and drives the ball-screw rotation, and through the leading screw pair of nut rotation is converted into the linear reciprocating motion of push wave plate, produces wave thereby promote water body.In this experimental facilities, determine that by debugging the wave maker parameter is as follows: the range of wave maker is 15cm, and maximal rate is 38cm/s, and maximum load power is 1200W, maximum water depth 0.6m, and maximum wave height 0.2m, wave period are 1.5s.Wherein servomotor is produced by Tianjin Mo Ruike Autotek S. r. l., and ball-screw flies Science and Technology Ltd. by Tianjin more and produces.
After making up complete artificial bank band pollutant Transport And Transformation indoor simulation device, the inner layered soil of filling, the on-the-spot soil layer construction of this soil body approximate simulation, the on-site soil top layer to upper soll layer below ten meters be respectively plain fill (0-0.5m height), dredger fill (0.5-5.5m height), silt clay (5.5-8.7m highly), silt (8.7-10.5m highly).Plain fill and dredger fill are barged-in fill, and it is 6m highly altogether, and this two-layer soil is the soil layer construction that is formed by barged-in fill; Silt clay and silt are the original substrate soil layer construction of bank body.The following soil layer construction of 10m has silt clay, silty clay, silt, silty clay, clay etc.Based on above-mentioned actual conditions and this experiment condition, to ten meters soil layer construction below the top layer, the corrosion resistant plate of device bottom can play the water proof base plate effect of soil layer construction below ten meters to indoor set institute fill stratum with top layer in the Reality simulation situation.To determine 4 soil layers that device is filled out after the actual soil layer scaled down: the device bottom highly loads silt to 20cm, and 20cm-50cm loads silt clay, and 50cm-120cm filling dredger fill, 120cm-140cm load plain fill.
Main part is silt, silt clay composition, is mingled with a small amount of sand, and top is shell soil, and this soil layer construction is mainly the hypotonicity soil body.Carry out water level control by the both sides water-level control apparatus, regulate respectively the height of fresh water position and seawater position, make this system keep stable underground water and seawater velocity, and be used for follow-up measuring.
Behind this invention well casing insertion low osmotic medium aquifer, see through rubber stopper small hose is inserted in the well casing, notice that the flexible pipe bottom enters bottom floral tube section, but do not brush up against upward sealing of bottom, leave a determining deviation, to guarantee pump-out.Then No. 14 holes among Fig. 7 are connect vacuum pump, No. 15 the suction hose hole connects the wriggling suction pump, the lower cylindrical ring is interior owing to exist wash water cotton, can attract the water in the peripheral extent to enter absorbent wool, seal the bottom, coarse sand is equipped with in the inside, can prevent that the mud medium from entering well casing on the one hand, can increase on the other hand the inflow of bottom, extract the air of well casing out in formation pipe negative pressure by opening vacuum pump, then open suction pump, at this moment, the Water Pressure that the water in the wash water cotton is subject to the outside will constantly enter well casing inside, and wash water is cotton because release the absorption water yield on every side that water also can continue, thereby can make thin suction hose can constantly extract the water yield in the medium out, to be used for experimental analysis, can need to repeatedly not draw water because water absorption is not enough just can reach the water supply volume requirement.
After agent structure and well casing all make up complete and stable testing, carry out the simulation of underground water and seawater reciprocation, by the draw water test and get the extraction water sample and carry out analysis of water of this well, test result is as follows:
Chlorine ion concentration in the well casing (mol/L) measurement result:
It is as follows to extract water sample analysis of water (three nitrogen) result in the well casing out:
According to the above indoor physical simulation device of building, determine hydrogeological parameter and its hydrogeological model of generalization of this device, set up corresponding Mathematical Modeling.Use Visual Modflow groundwater simulation software that the solute transfer in the underground water is simulated, the solute of choosing in this research method is the nitrogen of various forms, with the data that recorded Mathematical Modeling is identified checking, and react the Transport of the nitrogen of various forms in the artificial bank band by the visualization interface of Visual Modflow.
More than the present invention has been done exemplary description; should be noted that; in the situation that does not break away from core of the present invention, the replacement that is equal to that any simple distortion, modification or other those skilled in the art can not spend creative work all falls into protection scope of the present invention.
Claims (8)
1. one kind is used for the vertical efficient well casing that extracts low-permeability water-bearing medium underground water in laboratory, the common PVC well casing commonly used to the laboratory improves, it is characterized in that be provided with double-hole rubber plug at an end opening place of described well casing, a hole is as inlet, outlet; A hole is as the suction hose patchhole;
Be provided with the floral tube section in the bottom of described well casing, arrange porose on the exterior periphery of the well casing of described floral tube section; Well casing inner circumferential in described well casing bottom floral tube section is provided with the water accepting layer torus, and inside is filled with absorbent material, and outer wrap has filter membrane, to play permeable and a group water-bearing media effect;
Be provided with filtration beds in the bottom of well casing floral tube section and seal, filtration beds upper wall macropore rigid plastics, lower wall aperture rigid plastics, the upper and lower opening aperture size is as the criterion with the coarse sand of putting into, the middle large aperture sand grains of placing.
2. according to claim 1 a kind of for the vertical efficient well casing that extracts low-permeability water-bearing medium underground water in laboratory, it is characterized in that described well casing is pvc pipe, internal diameter Ф=14mm; Suction hose uses the 16# flexible pipe supporting with peristaltic pump; Floral tube section mesh aperture: 2mm arranges height: 5cm, and pitch of holes: 3-7mm arranges at random; Aspirating hole aperture: 5mm; It is inner and be drawn out of that the filter membrane aperture 20 μ m of absorbent material layer parcel, thick 80 μ m, the water-bearing media that can prevent the side enter well casing; Floral tube bottom filtration beds floor height: 2cm, upper wall large aperture: 3mm, lower wall small-bore: 1mm, upper lower wall surface is made of rigid plastics; The middle coarse sand granule of filling, particle diameter 2-4mm, greater particle size are filled in first the bottom, use afterwards than small particle diameter and fill, and can play like this that to prevent that well casing lower end water-bearing media from entering well casing inner and extracted out by drinking-water pipe.
3. the application in artificial bank band pollutant Transport And Transformation indoor simulation device such as claim 1 or 2 described well casings, it is characterized in that, described well casing is in artificial bank band pollutant Transport And Transformation indoor simulation device, use as pre-buried well, described artificial bank band pollutant Transport And Transformation indoor simulation device, comprise reactive tank, Simulation of Precipitation device, wave generator, wherein:
The two ends of described reactive tank are separated out respectively groove head, groove body and three parts of groove tail by dividing plate, its middle slot is first to link to each other with fresh water feed system, sea water supply system respectively with the groove tail, and realizes the real-time monitoring of side direction water level and flow rate of water flow by tank gage and adjusting device;
Described wave generator links to each other with the sea water supply system, controls by control device, thereby reflects that truly wave is on the impact of degree of saltiness water mutual effect;
Described Simulation of Precipitation device is arranged on the top of analogue means, realizes that by spray equipment and control device control flow research precipitation is on the impact of pollutant Transport And Transformation;
From groove head, groove body to the groove tail, along the flow direction, settle respectively linker in the trip of the upper, middle and lower of device one side, by the height of water level of linker reaction unit inside;
Described groove body position is filled with soil horizon, and is preset with the pre-buried well of different depth in the filling process, can test wherein pollutant and other indexs by extracting liquid in the pre-buried well, for the later stage numerical simulation provides the data basis.
4. the application of well casing according to claim 3 in artificial bank band pollutant Transport And Transformation indoor simulation device is characterized in that, described pre-buried well is 3 row, 8 row, amounts to 24.
5. the application of well casing according to claim 3 in artificial bank band pollutant Transport And Transformation indoor simulation device, it is characterized in that, described dividing plate is with porose poly (methyl methacrylate) plate, and adopt braid to cover, penetrate soil with fresh water, the seawater of implement device both sides and in soil, reciprocation occurs and prevent the soil clogging intake-outlet.
6. the application of well casing according to claim 3 in artificial bank band pollutant Transport And Transformation indoor simulation device is characterized in that described reactive tank framework is selected the thickening corrosion resistant plate, for example 340 type stainless steels.
7. the application of well casing according to claim 3 in artificial bank band pollutant Transport And Transformation indoor simulation device, it is characterized in that in use, control fresh water water inlet end height of water level is 120cm, seawater brings out mouth of a river 80cm, the amount of precipitation of spray is 10mm, and the range of wave maker is 15cm, and maximal rate is 38cm/s, maximum load power is 1200W, maximum water depth 0.6m, maximum wave height 0.2m, wave period are 1.5s.
8. the application of well casing according to claim 3 in artificial bank band pollutant Transport And Transformation indoor simulation device is characterized in that, in use, bankets as follows in the indoor physical simulation device:
Actual conditions and this experiment condition based on economic zone, indoor set institute fill stratum with top layer in the Reality simulation situation to ten meters soil layer construction below the top layer, the corrosion resistant plate of device bottom can play the water proof base plate effect of soil layer construction below ten meters, to determine 4 soil layers that device is filled out after the actual soil layer scaled down: the device bottom highly loads silt to 20cm, 20cm ~ 50cm loads silt clay, and 50cm ~ 120cm filling dredger fill, 120cm ~ 140cm load plain fill
For the soil structure of real simulation place, fetching earth is selected from casual labourer industrial occupancy, Tianjin, and according to the geotechnical investigation report, the type that fetches earth mainly is divided into silt clay, silty clay, silt and sandy soil.Fetch earth and first soil is exposed to the sun after finishing, as far as possible indigenous microorganism is removed, removed the impurity of sneaking in the soil by screening, then soil is pulverized in order to filling, in device, add first the water yield of half degree of depth before banketing, whether verifying attachment leaks, and bankets after leak detection is finished, and really reflects the height of phreatic table in the device in order to make the device water level connecting pipe, spread the thick coarse sand of 5cm at the device bottom first, load silt at coarse sand, loading height is 20cm, is considered as first floor soil; The second layer is silt clay, loading height 30cm; The 3rd layer is dredger fill, and the soil that fills is the composite soil of silt clay, shell soil, silty clay, and mixed proportion is 1:1:1, and loading height is 70cm; The 4th layer is plain fill, and its main component is building debris, and top covers with fine sand, and loading height is 20cm; In whole filling process, for guarantee to banket evenly, the people is not for causing soil crack, when every interpolation soil layer 20cm, tamp, and cloth spills tap water, leave standstill a period of time after, make its natural subsidence, and then earth filling tamping, this process repeatedly is until the 20cm soil layer is unchanged, carry out again lower one deck filling, until load complete; After the soil filling is complete, water flowing a period of time, confirm soil layer without sedimentation, determine that finally the soil layer packed height is 1.4m.
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| CN201510182034.1A CN104820079B (en) | 2013-01-04 | 2013-01-04 | Well casing application in artificial bank band contaminant transportation converts indoor simulation device |
| CN201510182176.8A CN104807961B (en) | 2013-01-04 | 2013-01-04 | Artificial bank band contaminant transportation with well casing converts indoor simulation device |
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| CN201510182176.8A Division CN104807961B (en) | 2013-01-04 | 2013-01-04 | Artificial bank band contaminant transportation with well casing converts indoor simulation device |
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| CN201510182034.1A Expired - Fee Related CN104820079B (en) | 2013-01-04 | 2013-01-04 | Well casing application in artificial bank band contaminant transportation converts indoor simulation device |
| CN201310001457.XA Expired - Fee Related CN103046528B (en) | 2013-01-04 | 2013-01-04 | A kind of well casing for underground water in the vertical efficient decimation low-permeability water-bearing medium of laboratory and using method |
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| CN201510182034.1A Expired - Fee Related CN104820079B (en) | 2013-01-04 | 2013-01-04 | Well casing application in artificial bank band contaminant transportation converts indoor simulation device |
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Also Published As
| Publication number | Publication date |
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| CN104820079B (en) | 2016-08-17 |
| CN104807961B (en) | 2016-08-17 |
| CN104807961A (en) | 2015-07-29 |
| CN104820079A (en) | 2015-08-05 |
| CN103046528B (en) | 2015-12-09 |
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