CN103088836A - Sedimentation control method for pumping water and performing reinjection in well casing simultaneously - Google Patents
Sedimentation control method for pumping water and performing reinjection in well casing simultaneously Download PDFInfo
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- CN103088836A CN103088836A CN2012105432534A CN201210543253A CN103088836A CN 103088836 A CN103088836 A CN 103088836A CN 2012105432534 A CN2012105432534 A CN 2012105432534A CN 201210543253 A CN201210543253 A CN 201210543253A CN 103088836 A CN103088836 A CN 103088836A
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Abstract
The invention discloses a sedimentation control method for pumping water and performing injection in a well casing simultaneously. The method comprises the following steps of: 1) analyzing and determining a water filtering section position of a pumping well and a water filtering section position of a reinjection well at the same wellhole position according to the depth of a foundation pit, the depth of a waterproof curtain and the distribution condition of a water-bearing layer; 2) designing and determining a waterstop section, a water filtering section and a sedimentation section of the pumping well, and designing and determining a waterstop section, a water filtering section and a sedimentation section of the reinjection well; 3) determining the diameter and the depth of the drilled wellhole according to the structure of the well casing; 4) drilling the wellhole to the position of the casting bottom of the well casting by using a drilling machine; and 5) finishing construction of the reinjection well and a dewatering well at the same wellhole position, and forming a water pumping and reinjection double-purpose well casting, wherein an irrigation pipe of the reinjection well is fixed in the well casting of the dewatering well, and the upper end of the irrigation pipe of the reinjection well is flush with that of the well casting of the dewatering well. By the method, a supplementary amount of the water-bearing layer from outside to inside of the foundation pit, and the ground settlement can be reduced, and groundwater resources can be protected.
Description
Technical field
Recharge to control the method for surface settlement and protection underground water when the present invention relates to precipitation; relate in particular to a kind of Land-Subsidence Control method of drawing water simultaneously and recharging in a well casing; the situation that is applicable to carry out precipitation in the stratum of deep aquifer or the distribution of aquifer stratification and need to controls surface settlement; can be mainly used in the base pit engineering field, other is as construction of tunnel field, foundation treatment engineering field etc.
Background technology
Along with construction work develops to " building height is high, basic embedding dark " both direction, the underground engineering construction degree of depth such as base pit engineering increase day by day, often relate to underground deep aquifer or multi-layered aquifer, foundation pit dewatering project can extract a large amount of underground water deeply, greatly, cause the engineering problems such as surface settlement, groundwater resources waste, so need to take rational engineering measure to avoid bad engineering consequence to occur, draw water simultaneously in a kind of well casing of the present invention and the subsidence control method that recharges is namely a kind of like this engineering measure.
When carrying out foundation pit dewatering in deep aquifer, in order to reduce Pit Discharge and to control surface settlement, often water-stop curtain is deepened, construction technology can make water-stop curtain the most deeply reach approximately 55m at present, becomes the suspension type water-stop curtain when water-stop curtain can not block the aquifer.Precipitation in the suspension type water-stop curtain, the feature of seepage field is the top, current direction aquifer at bottom, aquifer or middle part, be at the bottom of foundation ditch in well casing precipitation from from bottom to top water supply supply in the aquifer, the aquifer obtains again the outer aquifer water supply supply of foundation ditch in foundation ditch or near foundation ditch, forms from outside to inside, seepage field percolation path from bottom to top.If can be in the bottom, aquifer or the middle part recharge well is set so that water recharging to be provided, can reduce the supply in the foundation ditch of foundation ditch outer aquifer, just can reach and reduce the purpose of cheating the sedimentation of outer ground.
Tube well dewatering is a kind of dewatering construction technology of maturation, and downcast well pipe comprises sealing section, drainage section and precipitating phase three parts.During construction, elder generation puts well bore by rig at well location, and wellhole is descended well casing after getting into desired depth, fills out filtrate, clay ball in the space between well casing and hole wall, can descend pump to draw water after well-flushing.When filling out filtrate, clay ball, filtrate is filled out drainage section and precipitating phase position, clay ball is filled out the sealing fragment position.The construction technology that pipe well recharges and tube well dewatering are almost completely identical, and difference is that dewatering well drainage section act as the aquifer and seeps water in well, and recharge well drainage section act as the interior recharge water of well and seeps water to the aquifer.
In order to guarantee the recharge water quality in case recharge silting, the water that needs to extract out from the aquifer remakes the use of recharging after the precipitation clarification in sedimentation basin.
Summary of the invention
The present invention provides for solving the technical problem that exists in known technology the subsidence control method that draws water simultaneously and recharge in a kind of well casing, to reduce the aquifer by increment in the export-oriented foundation ditch of foundation ditch, reduces surface settlement, the protection groundwater resources.
The technical scheme that the present invention takes for the technical problem that exists in the solution known technology is: the subsidence control method that draws water simultaneously and recharge in a kind of well casing comprises the following steps:
One) according to foundation depth, the water-stop curtain degree of depth and aquifer distribution situation, Analysis deterrmination is taken out the drainage fragment position of well and the drainage fragment position of recharge well on same wellhole position;
Two) sealing section, drainage section and the precipitating phase of pumped well determined in design, and sealing section, drainage section and the precipitating phase of recharge well determined in design;
Three) according to the well casing structure, determine wellhole bore diameter and the degree of depth;
Four) adopt drill drilling hole depth location at the bottom of the well casing pipe;
Five) complete the construction of recharge well and dewatering well on same wellhole position, form and draw water and recharge dual-purpose well casing, the irrigation pipe of recharge well is fixed in the well casing of dewatering well, and the well casing upper end of the irrigation pipe upper end of recharge well and dewatering well is concordant.
The diameter of the well casing of described recharge well is less than the diameter of the well casing of described dewatering well, and the irrigation pipe diameter of described recharge well is identical with the well casing diameter of recharge well, and the irrigation pipe of described recharge well and the well casing of described recharge well are mutually affixed.
The diameter of the well casing of described recharge well is identical with the diameter of the well casing of described dewatering well, and the irrigation pipe diameter of described recharge well is less than the well casing diameter of described recharge well, and the lower end of the irrigation pipe of described recharge well extends to the drainage section upper end of described recharge well.
The diameter of the well casing of described recharge well is identical with the diameter of the well casing of described dewatering well, and the irrigation pipe diameter of described recharge well is less than the well casing diameter of described recharge well, and the lower end of the irrigation pipe of described recharge well extends to the sealing section upper end of described recharge well.
Advantage and good effect that the present invention has are: based on the seepage field characteristics of foundation pit dewatering in deep aquifer, downcast well pipe is vertically extended to the water supply supply position in aquifer, in this position, well casing is set and recharges the drainage section, arrange in dewatering well and recharge the water that passage goes extraction and recharge to recharging the drainage section after the precipitation clarification, reduce the aquifer by increment in the export-oriented foundation ditch of foundation ditch, reduce surface settlement.The present invention is with precipitation and recharge two kinds of technology and integrate, and the transformation well casing makes a well dual-purpose, has simultaneously and draws water and recharge function, have advantages of easy construction, cheap, recharge efficient, to control effect of settling good, has application value.
Description of drawings
Fig. 1 is the top view that dual-purpose well casing was drawn water and recharged to the first of application the present invention formation;
Fig. 2 is the lateral view that dual-purpose well casing was drawn water and recharged to the first of application the present invention formation;
Fig. 3 is the sectional drawing of Fig. 1;
Fig. 4 is the top view that the second of application the present invention formation drew water and recharged dual-purpose well casing;
Fig. 5 is the lateral view that the second of application the present invention formation drew water and recharged dual-purpose well casing;
Fig. 6 is the sectional drawing of Fig. 4;
Fig. 7 draws water for the third that use that the present invention forms and recharges the top view of dual-purpose well casing;
Fig. 8 draws water for the third that use that the present invention forms and recharges the lateral view of dual-purpose well casing;
Fig. 9 is the sectional drawing of Fig. 7;
Figure 10 is the schematic diagram that the present invention uses.
In figure: 1, the sealing section of pumped well, 2, the drainage section of pumped well, 3, the precipitating phase of pumped well, 4, the sealing section of recharge well, 5, the drainage section of recharge well, 6, the precipitating phase of recharge well, 7, well casing, 8, irrigation pipe, 9, iron plate is supported in welding, and 10, foundation ditch, 11, water-stop curtain, 12, aquifer, 13, draw water and recharge dual-purpose well casing.
The specific embodiment
For further understanding summary of the invention of the present invention, Characteristic, hereby exemplify following examples, and coordinate accompanying drawing to be described in detail as follows:
See also Fig. 1～Figure 10, the subsidence control method that draws water simultaneously and recharge in a kind of well casing comprises the following steps:
One) according to the degree of depth of foundation ditch 10, the degree of depth of water-stop curtain 11 and the distribution situation in aquifer 12, the position of the position of Analysis deterrmination drainage section 2 of pumped well on same wellhole position and the drainage section 6 of recharge well;
Two) sealing section 1, drainage section 2 and the precipitating phase 3 of pumped well determined in design, and sealing section 4, drainage section 5 and the precipitating phase 6 of recharge well determined in design;
Three) according to the well casing structure, determine wellhole bore diameter and the degree of depth;
Four) adopt drill drilling hole depth location at the bottom of the well casing pipe;
Five) complete the construction of recharge well and dewatering well on same wellhole position, formation is drawn water and is recharged dual-purpose well casing 13, the irrigation pipe 8 of recharge well supports in the well casing 7 that iron plate 9 is fixed on dewatering well by welding, and well casing 7 upper ends of irrigation pipe 8 upper ends of recharge well and dewatering well are concordant.
See also Fig. 1～Fig. 3, Fig. 1～Fig. 3 shows above-mentioned the first structure of drawing water and recharging dual-purpose well casing, the diameter of the well casing of described recharge well is less than the diameter of the well casing of described dewatering well, the diameter of the irrigation pipe 8 of described recharge well is identical with the well casing diameter of recharge well, and the irrigation pipe 8 of described recharge well is mutually affixed with the well casing of described recharge well.
See also Fig. 4～Fig. 6, Fig. 4～Fig. 6 shows above-mentioned the second structure of drawing water and recharging dual-purpose well casing, the diameter of the well casing of described recharge well is identical with the diameter of the well casing of described dewatering well, the diameter of the irrigation pipe 8 of described recharge well is less than the well casing diameter of described recharge well, and the lower end of the irrigation pipe 8 of described recharge well extends to the drainage section upper end of described recharge well.
See also Fig. 7～Fig. 9, Fig. 7～Fig. 9 shows above-mentioned the third structure of drawing water and recharging dual-purpose well casing, the diameter of the well casing of described recharge well is identical with the diameter of the well casing of described dewatering well, the diameter of the irrigation pipe 8 of described recharge well is less than the well casing diameter of described recharge well, and the lower end of the irrigation pipe 8 of described recharge well extends to the sealing section upper end of described recharge well.
The concrete operation of Cheng Jing is:
(a) place well casing at the bottom of prefabricated well, slowly transfer, when the mouth of pipe and well head differ 200mm, connect the joint well casing.Hang well casing and want vertical, and remain on the wellhole center, flow in well for preventing rainwater silt particle or foreign matter, the well casing 200mm that is not less than above ground level, and add a cover temporary protection.Well casing drainage section adopts the sand concrete free chimney filter or with the iron pipe of filter opening, and the non-filter pipe of well casing adopts the sand concrete free chimney filter or not with the iron pipe of filter opening.
(b) insert immediately filtrate and clay ball after well casing is lowered to.Filtrate is inserted drainage section and precipitating phase position, and clay ball is inserted the sealing fragment position.Filtrate and clay ball are evenly inserted along the wellhole surrounding, should keep continuously mud being extruded wellhole.When filling out filtrate and clay ball, insert height with filling out with surveying filtrate and clay ball, when the amount of inserting and theoretical amount of calculation are inconsistent, in time search reason and mend and fill out or change and fill out.
(c) should carry out immediately well-flushing after filling out filtrate and clay ball, in order to avoid overlong time, retaining wall mud skin is aging gradually, is difficult to destroy impact infiltration and irrigation effect.During flushing, adopt lower pump examination to take out well-flushing, repeatedly take out with submersible pump and wash, until the water sand removal is clean.
After this, draw water, the current that draw water are placed in external sedimentation basin.After clarification of water, clear water is extracted the pipe that recharges that pours in well casing with water pump in sedimentation basin.
The present invention is directed to the seepage field characteristics of foundation pit dewatering in deep aquifer; in the precipitation location arrangements drainage section of drawing water; recharge the drainage section in moisturizing position setting; precipitation is completed with recharging in a well casing; easy construction, cheap, recharge efficiently, play the purpose of controlling surface settlement and protection of groundwater resource.
Basic principle of the present invention is: precipitation in the suspension type water-stop curtain, the feature of seepage field is the top, current direction aquifer at bottom, aquifer or middle part, be at the bottom of foundation ditch in well casing precipitation from from bottom to top water supply supply in the aquifer, the aquifer obtains again the outer aquifer water supply supply of foundation ditch in foundation ditch or near foundation ditch, forms from outside to inside, seepage field percolation path from bottom to top.Based on such seepage field characteristics, downcast well pipe is vertically extended to the water supply supply position in aquifer, in this position, well casing is set and recharges the drainage section, namely in the precipitation location arrangements drainage section of drawing water, arrange in the moisturizing position and recharge the drainage section.Arrange in dewatering well and recharge the water that passage goes extraction and recharge after the precipitation clarification to recharging the drainage section, with precipitation with recharge in a well casing and complete, reduce the aquifer by increment in the export-oriented foundation ditch of foundation ditch, reduce surface settlement.
The present invention is based on the characteristics of seepage field of foundation pit dewatering; integrate existing ripe dewatering well technology and recharge well technology; recharge passage by setting in dewatering well and make two wells unifications; not only can reduce surface settlement but also can protect groundwater resources, simultaneously this technology have easy construction, cheap, recharge efficient advantage.
Application example 1 of the present invention:
See also Figure 10, the rectangular long 160m of metro station base pit engineering, wide 22.1m takes cut and cover tunneling, and supporting and protection structure is diaphragm wall and inner support, and foundation ditch digs dark 25.63m.Diaphragm wall doubles as water-stop curtain, wall thickness 1m, the dark 45m of wall.Artesian aquifer top board buried depth is 30m, and moisture bed thickness reaches 21m.Foundation pit dewatering well drainage section enters artesian aquifer, and water-stop curtain does not block artesian aquifer, adopts conventional precipitation method can cause artesian aquifer to draw water in a large number and is difficult to control with surface settlement.Adopt the inventive method that surface settlement is effectively controlled.
According to computational analysis, determine the well casing long 35m of part that draws water, be wherein that sealing section, 134m are precipitating phase for the drainage section of drawing water, 34～35m from the downward 01m of the mouth of pipe; The long 20m of part that determines to pour water, from the downward 3543m of the mouth of pipe be sealing section, 4354m for recharge the drainage section, 5455m is precipitating phase.Draw water well casing diameter and irrigation pipe diameter is all 273mm, and length is 55m.The tube channel of pouring water diameter is 100mm, and length is 35m, and the tube channel of pouring water weldering is attached on well tubular wall.The well casing bore diameter is 600mm.Boring is 55m deeply.
Arrange altogether in foundation ditch and draw water and recharge totally 20 mouthfuls of dual-purpose well casings, foundation ditch arranges 4 sedimentation basins outward, and every 5 mouthfuls of wells share a sedimentation basin.Place a suction pump in each well casing, the water of extraction enters sedimentation basin, and the water in sedimentation basin after clarification smokes by water pump the tube channel of pouring water that is circulated in well casing again, and then recharges into the aquifer.
Through field monitoring, approximately 3/4 Pit Discharge recharges into underground reservoir, precipitation 6 months, and Land-Subsidence Control has reached the engineering Expected Results in 15mm.
Application example 2 of the present invention:
Certain mansion base pit engineering excavation area is 10,000 m approximately
2, cutting depth is 14.2m approximately, and foundation pit supporting project adopts twice temporary steel reinforced concrete horizontal supporting system; Water-stop curtain is single Φ 650@900 3 axle cement mixing piles, the long 23m of stake; Take cut and cover tunneling.Cover artesian aquifer under foundation ditch, its layer top buried depth is about 30.5m, aquifer thickness 33m left and right, and the artesian water depth to water is about 1.50～1.90m, does not satisfy anti-ly prominently to gush Stability Checking Calculation, needs to arrange pressure reduction well in engineering.Adopt conventional precipitation method can cause artesian aquifer to draw water in a large number and surface settlement is difficult to control, adopting the inventive method that pressure reduction well is made becomes step-down and recharges dual-purpose well casing, and step-down and recharge simultaneously and carry out is effectively controlled surface settlement.
According to computational analysis, determine that step-down recharges the dual-purpose well casing long 38m of part that draws water, be wherein that sealing section, 3137m are precipitating phase for the drainage section of drawing water, 3738m from the downward 031m of the mouth of pipe; Determine that step-down recharges the dual-purpose well casing long 16m of part that pours water, from the downward 3843m of the mouth of pipe be sealing section, 4353m for recharge the drainage section, 5354m is precipitating phase.Draw water well casing diameter and irrigation pipe diameter is all 273mm, and length is 54m.The tube channel of pouring water diameter is 100mm, and length is 43m, and the tube channel of pouring water weldering is attached on well tubular wall.The well casing bore diameter is 600mm.Boring is 54m deeply.
In foundation ditch, the step-down well casing only drawn water and recharges dual-purpose well casing as of the present invention, arranging altogether and draw water and recharge totally 28 mouthfuls of dual-purpose well casings, foundation ditch arranges 7 sedimentation basins outward, and every 4 mouthfuls of wells share a sedimentation basin.Place a suction pump in each well casing, the water of extraction enters sedimentation basin, and the water in sedimentation basin after clarification smokes by water pump the tube channel of pouring water that is circulated in well casing again, and then recharges into artesian aquifer.
Through field monitoring, approximately 1/2 step-down pump-out is recharged into underground reservoir, step-down 3 months, and Land-Subsidence Control has reached the engineering Expected Results in 20mm.
Although the above is described the preferred embodiments of the present invention by reference to the accompanying drawings; but the present invention is not limited to the above-mentioned specific embodiment; the above-mentioned specific embodiment is only schematic; be not restrictive; those of ordinary skill in the art is under enlightenment of the present invention; not breaking away from the scope situation that aim of the present invention and claim protect, can also make a lot of forms, within these all belong to protection scope of the present invention.
Claims (4)
1. the subsidence control method that draws water simultaneously and recharge in a well casing is characterized in that, comprises the following steps:
One) according to foundation depth, the water-stop curtain degree of depth and aquifer distribution situation, Analysis deterrmination is taken out the drainage fragment position of well and the drainage fragment position of recharge well on same wellhole position;
Two) sealing section, drainage section and the precipitating phase of pumped well determined in design, and sealing section, drainage section and the precipitating phase of recharge well determined in design;
Three) according to the well casing structure, determine wellhole bore diameter and the degree of depth;
Four) adopt drill drilling hole depth location at the bottom of the well casing pipe;
Five) complete the construction of recharge well and dewatering well on same wellhole position, form and draw water and recharge dual-purpose well casing, the irrigation pipe of recharge well is fixed in the well casing of dewatering well, and the well casing upper end of the irrigation pipe upper end of recharge well and dewatering well is concordant.
2. the subsidence control method that draws water simultaneously and recharge in well casing according to claim 1, it is characterized in that, the diameter of the well casing of described recharge well is less than the diameter of the well casing of described dewatering well, the irrigation pipe diameter of described recharge well is identical with the well casing diameter of recharge well, and the irrigation pipe of described recharge well and the well casing of described recharge well are mutually affixed.
3. the subsidence control method that draws water simultaneously and recharge in well casing according to claim 1, it is characterized in that, the diameter of the well casing of described recharge well is identical with the diameter of the well casing of described dewatering well, the irrigation pipe diameter of described recharge well is less than the well casing diameter of described recharge well, and the lower end of the irrigation pipe of described recharge well extends to the drainage section upper end of described recharge well.
4. the subsidence control method that draws water simultaneously and recharge in well casing according to claim 1, it is characterized in that, the diameter of the well casing of described recharge well is identical with the diameter of the well casing of described dewatering well, the irrigation pipe diameter of described recharge well is less than the well casing diameter of described recharge well, and the lower end of the irrigation pipe of described recharge well extends to the sealing section upper end of described recharge well.
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| CN103306683A (en) * | 2013-06-18 | 2013-09-18 | 中铁隧道集团有限公司 | Construction method for comprehensive precipitation in hole in deep-buried tunnel excavation process |
| CN103510501A (en) * | 2013-10-23 | 2014-01-15 | 天津大学 | Method for preventing blocking and water gushing in recharge well |
| CN104594327A (en) * | 2015-01-13 | 2015-05-06 | 济南轨道交通集团有限公司 | Water settling, spring protection and recharging integrated device for foundation pit engineering |
| CN104831742A (en) * | 2015-04-15 | 2015-08-12 | 中国建筑第八工程局有限公司 | Foundation pit dewatering method with two adjacent micro confined aquifers not separated by water-proof layer |
| CN105155561A (en) * | 2015-09-21 | 2015-12-16 | 中铁上海工程局集团有限公司 | Relief well arrangement optimization method based on BIM technology |
| CN108277807A (en) * | 2018-04-09 | 2018-07-13 | 浙江乔兴建设集团有限公司 | Deep basal pit artesian water is prominent to gush decompression control water-bound |
| CN110485510A (en) * | 2019-09-26 | 2019-11-22 | 上海勘察设计研究院(集团)有限公司 | A kind of forced recharge well construction of gradation and its application method |
| CN114486683A (en) * | 2022-02-16 | 2022-05-13 | 上海工程技术大学 | Test device for simulating pumping in foundation pit and recharging underground water outside foundation pit |
| CN115305901A (en) * | 2022-08-16 | 2022-11-08 | 中交第四公路工程局有限公司 | Directional recharge and emergency pumping well |
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| CN103306683A (en) * | 2013-06-18 | 2013-09-18 | 中铁隧道集团有限公司 | Construction method for comprehensive precipitation in hole in deep-buried tunnel excavation process |
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| CN103510501B (en) * | 2013-10-23 | 2015-04-29 | 天津大学 | Method for preventing blocking and water gushing in recharge well |
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| CN105155561A (en) * | 2015-09-21 | 2015-12-16 | 中铁上海工程局集团有限公司 | Relief well arrangement optimization method based on BIM technology |
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| CN108277807A (en) * | 2018-04-09 | 2018-07-13 | 浙江乔兴建设集团有限公司 | Deep basal pit artesian water is prominent to gush decompression control water-bound |
| CN110485510A (en) * | 2019-09-26 | 2019-11-22 | 上海勘察设计研究院(集团)有限公司 | A kind of forced recharge well construction of gradation and its application method |
| CN110485510B (en) * | 2019-09-26 | 2024-03-19 | 上海勘察设计研究院(集团)股份有限公司 | Fractional press-in type recharging well structure and application method thereof |
| CN114486683A (en) * | 2022-02-16 | 2022-05-13 | 上海工程技术大学 | Test device for simulating pumping in foundation pit and recharging underground water outside foundation pit |
| CN114486683B (en) * | 2022-02-16 | 2023-07-21 | 上海工程技术大学 | Test device for simulating pumping water in foundation pit and recharging groundwater outside foundation pit |
| CN115305901A (en) * | 2022-08-16 | 2022-11-08 | 中交第四公路工程局有限公司 | Directional recharge and emergency pumping well |
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Application publication date: 20130508 |