CN101130954A - Vacuum decompression method for adjustable pressure water in series - Google Patents
Vacuum decompression method for adjustable pressure water in series Download PDFInfo
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- CN101130954A CN101130954A CNA2007100583984A CN200710058398A CN101130954A CN 101130954 A CN101130954 A CN 101130954A CN A2007100583984 A CNA2007100583984 A CN A2007100583984A CN 200710058398 A CN200710058398 A CN 200710058398A CN 101130954 A CN101130954 A CN 101130954A
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Abstract
The adjustable serial vacuum water pressure reducing process includes the following steps: measuring the water heads and thicknesses of adjacent pressure aquafers and the thickness of less permeable clay layer, drilling well bores from ground to the lower confined aquifer, laying well pipes, throwing material to between the well pipes and the aquafers, pumping water, setting air bags inside the well pipes in the locations corresponding to the less permeable clay layer, and inflating and deflating the air bags to control the linkage between the upper and the lower pressure aquafers. The present invention can realize the internal recycling of underground water system to reduce land subsidence and control the water flow exchange between aquafers to control land subsidence, and has low environment cost.
Description
Technical field
The present invention relates to artesian water vacuum pump-down method, relate in particular to a kind of vacuum decompression method for adjustable pressure water in series, be applicable to and use well casing pumping underground water to expect that again the various civil engineerings and the groundwater resources that reduce surface settlement to greatest extent utilize the field, as foundation pit dewatering field, groundwater resources management domain, underground water improvement field etc.
Background technology
Well-points dewatering because of have easy construction, economical and practical characteristics are used widely in foundation pit dewatering project, but increase and the pump-out increase with foundation depth, foundation pit dewatering brings the environmental hazard of surface settlement serious day by day, and very ftracture or jeopardize neighboring buildings safety in person ground.
Under some hydrogeological conditions, can utilize aquifer distribution, grain fraction and head difference characteristics to connect in the aquifer up and down, realize the underground water inner loop, both reduced pump-out, reduce the surface settlement value again.Draw the Successful Practice that the seepage well technology promptly is based on this principle as the Beijing area.Yet the shortcoming of seepage well technology is drawn in the Beijing area: well casing is a normal straight tube, unmanned in the well for controlling setting, can't initiatively control current exchange quantity between the aquifer, the unsteady state flow through porous medium state development of accepting after the hydraulic communication of stratum that can only be passive is set up until new hydraulic equilibrium, so uncontrollable surface settlement development.The seepage well that draws like this is simple combined shaft in fact.
U.S.'s Slug test aquifer well stream experimental technique has been used two air bag bag isolation technics and isolated the target test section in the aquifer, and people's water level in the well for a change again is according to water level recovery process measuring and calculating water-bearing interval transmission coefficient or coefficient of transmissibility.This technology is mainly used to calculate aquifer hydrology geologic parameter, tests at certain single aquifer, is not applied to the perforation effect between many aquifers.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of vacuum decompression method for adjustable pressure water in series is provided, and this method can reduce decompression target aquifer head, realizes the ground water regime inner loop, reduce surface settlement and can reduce pump-out, reduce construction costs.
A kind of vacuum decompression method for adjustable pressure water in series of the present invention, it may further comprise the steps:
(a) measure the every layer of head of adjacent artesian aquifer and the thickness of thickness and the clay aquitard between two aquifers;
(b) be higher than under the condition of lower floor's artesian aquifer at upper strata artesian aquifer head,, punch two artesian aquifers simultaneously from the degree of depth of ground well-digging hole to lower floor artesian aquifer;
(c) prepare well casing, be positioned at the sidewall locations perforate of upper and lower artesian aquifer to form the drainage section at well casing respectively;
(d) well casing is descended in the position of pressing each aquifer of drainage section correspondence in described wellhole, 2～3 layers of netted nylon gauze of the outer winding of drainage section;
(e) between well casing outer wall and described upper and lower artesian aquifer, throw the rubble pellet, between well casing outer wall and water table aquifer and described clay aquitard, throw clay ball;
(f) examination is drawn water, and observes the mixing head of two-layer artesian aquifer;
(g) air bag is placed in clay aquitard position in well casing, and guides out well head with forcing pipe and piezometer tube, connects pressure measurement and pressurization, reduced pressure appliance;
(h) above air bag, place iron annulus barrier, to stop the air bag buoyance lift;
(i) when the combined shaft head significantly is lower than upper strata artesian aquifer head, gas in the air bag is emitted, upper strata artesian aquifer water flows into lower floor's artesian aquifer, combined shaft precipitation, if surface settlement this moment is bigger, air bag is partly inflated, thereby upper and lower artesian aquifer is partly connected, develop with controlling ground settlement; When the combined shaft head is not less than upper strata artesian aquifer head, cut off the upper strata artesian water with between get in touch, only the upper strata artesian aquifer is fallen deeply or head control type precipitation.
The inventive method is compared with prior art and is had the following advantages: utilize aquifer hydrology geology characteristic, connect the different water cut layer, reduce decompression target aquifer head, realize the ground water regime inner loop, reduce surface settlement; Improve and to draw in the seepage well the artificially moisture interfluent flow exchange capacity of ACTIVE CONTROL at present, can only passively accept stratum natural adjusting result's present situation; Control moisture interfluent flow exchange capacity, regulate and the controlling ground settlement development; Utilize current to draw and ooze, reduce pump-out, reduce construction costs.
Description of drawings
When Fig. 1 is full of gas for air bag in a kind of vacuum decompression method for adjustable pressure water in series of the present invention, the view of full blocking-up between the upper and lower artesian aquifer;
When Fig. 2 partly inflates for air bag, the view that part connects between the upper and lower artesian aquifer;
Fig. 3 is in the air bag during no gas, the full view that connects between the upper and lower artesian aquifer.
The specific embodiment
Below in conjunction with the drawings and specific embodiments the present invention is done to describe in detail.
Basic principle of the present invention is: to the two adjacent artesian aquifers with head difference, upper strata artesian aquifer if desired draws water, and its artesian head is higher than lower floor's artesian aquifer, particularly working as lower floor's artesian aquifer is made up of fine and close gravel, under the quite little situation of compressibilty, then can utilize well casing to connect in the aquifer up and down, upper water is introduced lower floor, for thereby the unlikely excessive descent of control upper strata artesian aquifer head causes face sedimentation significantly, need the irrigation flow of control upper strata artesian aquifer to lower floor, so last, lower floor's artesian aquifer all is provided with filter pipe, last, the contraction of can reducing pressure is set in the well casing between the lower floor artesian water aquifer, the air bag of inflation is as partition apparatus, realize being communicated with fully, part is communicated with, cut off and multiple effect such as to get in touch between upper strata artesian water and the lower floor's artesian water, regulate air bag air pressure to change well casing flow section area according to engine request, fall dark value thereby reach the loss water yield and the head of controlling the upper strata artesian aquifer.
According to instructions for use, can pressurize and cut off the aquifer waterpower contact of upper and lower layer artesian water, or the upper and lower layer of decompression connection artesian water aquifer, and can regulate upper and lower aquifer pump-out.When falling the upper strata artesian water, when lower floor's artesian water head is starkly lower than upper strata artesian water head, the pressure reduction well well casing that is provided with extends to the lower aquifer of lower floor's artesian head, make the upper strata artesian water produce the effect that head reduces, reduce pump-out it is circulated in ground water regime, thereby reach the purpose that reduces surface settlement.Also can implement the vacuum step-down of drawing water, cut off upper and lower layer artesian water aquifer this moment the upper strata artesian aquifer.
May further comprise the steps based on above-mentioned principle the inventive method: (a) measure each layer head of adjacent artesian aquifer 1,2 and the thickness of thickness and the clay aquitard between two aquifers; (b) be higher than under the condition of lower floor's artesian aquifer 2 at upper strata artesian aquifer 1 head,, punch two artesian aquifers simultaneously from the degree of depth of ground well-digging hole to lower floor artesian aquifer; (c) prepare well casing, the sidewall locations perforate that is positioned at upper and lower artesian aquifer at well casing to be forming the drainage section respectively, and aperture and percent opening are decided according to aquifer sand particle diameter and construction experience; (d) well casing is descended in the position of pressing each aquifer of drainage section correspondence in described wellhole, 2～3 layers of netted nylon gauze of the outer winding of drainage section; (e) between well casing outer wall and described upper and lower artesian aquifer, throw the rubble pellet, between well casing outer wall and water table aquifer 3 and described clay aquitard 4, throw clay ball; (f) examination is drawn water, and observes the mixing head of two-layer artesian aquifer; (g) air bag 5 is placed in clay aquitard position in well casing, and guides out well head with forcing pipe and piezometer tube, connects pressure measurement and pressurization, reduced pressure appliance; (h) above air bag, place iron annulus barrier, to stop the air bag buoyance lift; (i) when the combined shaft head significantly is lower than upper strata artesian aquifer head, gas in the air bag is emitted, upper strata artesian aquifer water flows into lower floor's artesian aquifer, combined shaft precipitation, if surface settlement this moment is bigger, air bag is partly inflated, thereby upper and lower artesian aquifer is partly connected, develop with controlling ground settlement; When the combined shaft head is not less than upper strata artesian aquifer head, cut off the upper strata artesian water and between get in touch, only (or head) control type precipitation is deeply fallen in the upper strata artesian aquifer.
The upper and lower layer head of measuring adjacent artesian aquifer is respectively buried depth 1.21m, buried depth 3.52m, and average thickness is respectively 6m, 3m, all is made up of flour sand; The average thickness of the clay aquitard between two aquifers is 11m; Calculating can get upper strata artesian aquifer head and be higher than lower floor's artesian aquifer, and from the degree of depth of ground well-digging hole to lower floor artesian aquifer, well depth is 38m; Preparing well casing length is 40m, is positioned at the sidewall locations perforate formation drainage section of upper and lower artesian aquifer respectively at well casing, and the aperture is 5mm, and the drainage section is twined 2 layers of netted nylon gauze of parcel; Press position following well casing in described wellhole in each aquifer of drainage section correspondence; Between well casing outer wall and described upper and lower artesian aquifer space, throw the rubble pellet, between well casing outer wall and water table aquifer and described clay aquitard, throw clay ball; Examination is drawn water, and observes the mixing water hair of two-layer artesian aquifer now mix head and is lower than the nearly 1.60m of upper strata artesian aquifer self head; Air bag is placed in clay aquitard position in well casing, and guides out well head with forcing pipe and piezometer tube, connects pressure measurement and pressurization, reduced pressure appliance; Above air bag, place iron annulus barrier, to stop the air bag buoyance lift; Measure the combined shaft head this moment is buried depth 2.82m, upper strata artesian aquifer head is 1.20 meters, the combined shaft head significantly is lower than upper strata artesian aquifer head the gas in the air bag is emitted, upper strata artesian aquifer water flows into lower floor's artesian aquifer, combined shaft precipitation, control upper strata artesian aquifer falls dark or head reaches the design object scope.
The upper and lower layer head of measuring adjacent artesian aquifer is respectively buried depth 3.43m, buried depth 9.65m, and average thickness is respectively 7m, 12m, and the top artesian aquifer is made up of silt, flour sand, and the bottom artesian aquifer is made up of coarse sand; The average thickness of the clay aquitard between two aquifers is 23m; Calculating can get upper strata artesian aquifer head and be higher than lower floor's artesian aquifer, and from the degree of depth of ground well-digging hole to lower floor artesian aquifer, well depth is 57m; Preparing well casing length is 59m, is positioned at the sidewall locations perforate formation drainage section of upper and lower artesian aquifer respectively at well casing, and the aperture is 5mm, and the drainage section is twined 3 layers of netted nylon gauze of parcel; Press position following well casing in described wellhole in each aquifer of drainage section correspondence; Between well casing outer wall and described upper and lower artesian aquifer space, throw the rubble pellet, between well casing outer wall and water table aquifer and described clay aquitard, throw clay ball; Examination is drawn water, and observes the mixing water hair of two-layer artesian aquifer now mix head and is lower than the nearly 4.30m of upper strata artesian aquifer self head; Air bag is placed in clay aquitard position in well casing, and guides out well head with forcing pipe and piezometer tube, connects pressure measurement and pressurization, reduced pressure appliance; Above air bag, place iron annulus barrier, to stop the air bag buoyance lift; Measure the combined shaft head this moment is buried depth 7.81m, upper strata artesian aquifer head is buried depth 3.41m, the combined shaft head significantly is lower than upper strata artesian aquifer head, gas in the air bag is emitted, upper strata artesian aquifer water flows into lower floor's artesian aquifer, combined shaft precipitation, through 15 day time, recording the ground maximum settlement is 2.14cm, surface settlement is bigger, adopts described forcing pipe partly to inflate to air bag, thereby makes, following artesian aquifer partly connects, the speed of upper strata artesian aquifer water inflow lower floor artesian aquifer is slack-off, and the ground maximum settlement is maintained within the 3.50cm.
The upper and lower layer head of measuring adjacent artesian aquifer is respectively buried depth 2.43m, buried depth 3.56m, and average thickness is respectively 5m, 8m, and the top artesian aquifer is made up of flour sand, and the bottom artesian aquifer is made up of fine sand; The average thickness of the clay aquitard between two aquifers is 12m; Calculating can get upper strata artesian aquifer head and be higher than lower floor's artesian aquifer, and from the degree of depth of ground well-digging hole to lower floor artesian aquifer, well depth is 40m; Preparing well casing length is 42m, is positioned at the sidewall locations perforate formation drainage section of upper and lower artesian aquifer respectively at well casing, and the aperture is 5mm, and the drainage section is twined 2 layers of netted nylon gauze of parcel; Press position following well casing in described wellhole in each aquifer of drainage section correspondence; Between well casing outer wall and described upper and lower artesian aquifer space, throw the rubble pellet, between well casing outer wall and water table aquifer and described clay aquitard, throw clay ball; Examination is drawn water, and observes the mixing water hair of two-layer artesian aquifer now mix head and is lower than the nearly 0.60m of upper strata artesian aquifer self head; Air bag is placed in clay aquitard position in well casing, and guides out well head with forcing pipe and piezometer tube, connects pressure measurement and pressurization, reduced pressure appliance; Above air bag, place iron annulus barrier, to stop the air bag buoyance lift; Measure the combined shaft head this moment is buried depth 2.74m, upper strata artesian aquifer head is buried depth 2.81m, the combined shaft head is higher than upper strata artesian aquifer head, with gassy in the air bag with cut off the upper strata artesian water and between get in touch, only the upper strata artesian aquifer is carried out precipitation, control upper strata artesian aquifer falls deeply that (or head) reaches the design object scope.
Embodiment 4
The upper and lower layer head of measuring adjacent artesian aquifer is respectively buried depth 1.83m, buried depth 2.74m, and average thickness is respectively 4m, 5m, and the top artesian aquifer is made up of flour sand, and the bottom artesian aquifer is made up of fine sand; The average thickness of the clay aquitard between two aquifers is 7m; Calculating can get upper strata artesian aquifer head and be higher than lower floor's artesian aquifer, the degree of depth from ground well-digging hole to lower floor artesian aquifer, well depth is that 28m preparation well casing length is 30m, be positioned at the sidewall locations perforate formation drainage section of upper and lower artesian aquifer respectively at well casing, the aperture is 5mm, and the drainage section is twined 2 layers of netted nylon gauze of parcel; Press position following well casing in described wellhole in each aquifer of drainage section correspondence; Between well casing outer wall and described upper and lower artesian aquifer space, throw the rubble pellet, between well casing outer wall and water table aquifer and described clay aquitard, throw clay ball; Examination is drawn water, and observes the mixing water hair of two-layer artesian aquifer now mix head and is lower than the nearly 0.40m of upper strata artesian aquifer self head; Air bag is placed in clay aquitard position in well casing, and guides out well head with forcing pipe and piezometer tube, connects pressure measurement and pressurization, reduced pressure appliance; Above air bag, place iron annulus barrier, to stop the air bag buoyance lift; Measure the combined shaft head this moment is buried depth 2.14m, upper strata artesian aquifer head is buried depth 2.27m, the combined shaft head equals upper strata artesian aquifer head, with gassy in the air bag with cut off the upper strata artesian water and between get in touch, only the upper strata artesian aquifer is carried out precipitation, control upper strata artesian aquifer falls deeply that (or head) reaches the design object scope.
Claims (1)
1. vacuum decompression method for adjustable pressure water in series is characterized in that it may further comprise the steps:
(a) measure the every layer of head of adjacent artesian aquifer and the thickness of thickness and the clay aquitard between two aquifers;
(b) be higher than under the condition of lower floor's artesian aquifer at upper strata artesian aquifer head,, punch two artesian aquifers simultaneously from the degree of depth of ground well-digging hole to lower floor artesian aquifer;
(c) prepare well casing, be positioned at the sidewall locations perforate of upper and lower artesian aquifer to form the drainage section at well casing respectively;
(d) well casing is descended in the position of pressing each aquifer of drainage section correspondence in described wellhole, 2～3 layers of netted nylon gauze of the outer winding of drainage section;
(e) between well casing outer wall and described upper and lower artesian aquifer, throw the rubble pellet, between well casing outer wall and water table aquifer and described clay aquitard, throw clay ball;
(f) examination is drawn water, and observes the mixing head of two-layer artesian aquifer;
(g) air bag is placed in clay aquitard position in well casing, and guides out well head with forcing pipe and piezometer tube, connects pressure measurement and pressurization, reduced pressure appliance;
(h) above air bag, place iron annulus barrier, to stop the air bag buoyance lift;
(i) when the combined shaft head significantly is lower than upper strata artesian aquifer head, gas in the air bag is emitted, upper strata artesian aquifer water flows into lower floor's artesian aquifer, combined shaft precipitation, if surface settlement this moment is bigger, air bag is partly inflated, thereby upper and lower artesian aquifer is partly connected, develop with controlling ground settlement; When the combined shaft head is not less than upper strata artesian aquifer head, cut off the upper strata artesian water with between get in touch, only the upper strata artesian aquifer is fallen deeply or head control type precipitation.
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| CN200710058398A CN100575614C (en) | 2007-07-25 | 2007-07-25 | A kind of vacuum decompression method for adjustable pressure water in series |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106501157A (en) * | 2016-12-13 | 2017-03-15 | 河海大学 | Scene determines the inner tube drawdown double-tube method of outer tube aquiclude hydrogeological parameter |
| CN109724239A (en) * | 2018-12-29 | 2019-05-07 | 沈炜 | The water-saving heat pipe of water heater |
| CN110321577A (en) * | 2018-03-30 | 2019-10-11 | 北京交通大学 | Partially-penetrated well precipitation makes to cheat outer earth's surface settlement calculation method in the foundation pit of artesian water stratum |
| CN110510836A (en) * | 2019-09-26 | 2019-11-29 | 湖南新九方科技有限公司 | The circulation well cluster repair system in situ of heavy metal and organic pollutant in a kind of removal underground water |
-
2007
- 2007-07-25 CN CN200710058398A patent/CN100575614C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106501157A (en) * | 2016-12-13 | 2017-03-15 | 河海大学 | Scene determines the inner tube drawdown double-tube method of outer tube aquiclude hydrogeological parameter |
| CN106501157B (en) * | 2016-12-13 | 2019-07-12 | 河海大学 | Scene determines the inner tube drawdown double-tube method of outer tube aquiclude hydrogeological parameter |
| CN110321577A (en) * | 2018-03-30 | 2019-10-11 | 北京交通大学 | Partially-penetrated well precipitation makes to cheat outer earth's surface settlement calculation method in the foundation pit of artesian water stratum |
| CN110321577B (en) * | 2018-03-30 | 2021-11-16 | 北京交通大学 | Method for calculating settlement of surface outside foundation pit caused by incomplete well precipitation in foundation pit of confined water stratum |
| CN109724239A (en) * | 2018-12-29 | 2019-05-07 | 沈炜 | The water-saving heat pipe of water heater |
| CN109724239B (en) * | 2018-12-29 | 2020-12-18 | 安徽国星生物化学有限公司 | Water-saving heat pipe of water heater |
| CN110510836A (en) * | 2019-09-26 | 2019-11-29 | 湖南新九方科技有限公司 | The circulation well cluster repair system in situ of heavy metal and organic pollutant in a kind of removal underground water |
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| CN100575614C (en) | 2009-12-30 |
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Granted publication date: 20091230 Termination date: 20110725 |