CN111980044B - Dewatering well structure for separating adjacent aquifers and method for backfilling outside well wall - Google Patents

Dewatering well structure for separating adjacent aquifers and method for backfilling outside well wall Download PDF

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Publication number
CN111980044B
CN111980044B CN202010647333.9A CN202010647333A CN111980044B CN 111980044 B CN111980044 B CN 111980044B CN 202010647333 A CN202010647333 A CN 202010647333A CN 111980044 B CN111980044 B CN 111980044B
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Prior art keywords
well
bag
aquifer
filter
aquifers
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CN111980044A (en
Inventor
郑灿政
李虎
商金华
韩刚
张兵兵
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Jinan Rail Transit Group Co Ltd
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Jinan Rail Transit Group Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00Keeping dry foundation sites or other areas in the ground
    • E02D19/06Restraining of underground water
    • E02D19/10Restraining of underground water by lowering level of ground water
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D15/00Handling building or like materials for hydraulic engineering or foundations
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/18Making embankments, e.g. dikes, dams
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D5/00Lining shafts; Linings therefor

Abstract

The invention discloses a dewatering well structure for separating adjacent aquifers and a backfill method outside a well wall, which solve the problem that hydraulic connection is easy to occur between the adjacent aquifers in the prior art, solve the problem of hydraulic connection channels outside the well wall during construction of a dewatering well, realize targeted dewatering on a target aquifer, guarantee the safety of a foundation pit, and realize accurate water level observation on the target aquifer. The specific scheme is as follows: a dewatering well structure for separating adjacent aquifers comprises a well body, wherein a filter pipe of the lower half section of the well body is inserted into a target aquifer, a separation structure is arranged between the adjacent aquifers on the outer side of the well body, the separation structure is provided with a set height, the inner side of the separation structure is attached to the outer wall of the well body, and the outer side of the separation structure is attached to a soil body.

Description

Dewatering well structure for separating adjacent aquifers and method for backfilling outside well wall
Technical Field
The invention relates to the field of civil construction, in particular to a dewatering well structure for separating adjacent aquifers and a backfill method outside a well wall.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The traditional construction backfill method of the dewatering well generally comprises the steps of filling filter materials outside the well to a position close to a well head after the dewatering well is arranged, and then backfilling with clay balls. Under the geological condition with a plurality of aquifers, each aquifer is easy to generate hydraulic connection through a filter material on the outer side of a well wall, the inventor finds that the existing construction method of the well can not lead to targeted precipitation of a precipitation well on a target aquifer or lead to inaccurate water level observation well data, the water level data are expressed as mixed water levels after hydraulic connection of each aquifer, in addition, the water quality of a deep aquifer is often superior to that of a shallow aquifer, and the existing precipitation well backfilling method can cause stratum-crossing pollution of the deep aquifer and the shallow aquifer.
For example, a foundation pit of a building needs to be lowered, hydrogeological conditions relate to a plurality of aquifers, pressure reduction and precipitation are needed to be carried out on a confined aquifer for avoiding water gushing or uplifting of the foundation pit, at the moment, the confined aquifer is supplied through a filter material outside a well wall due to the fact that the pressure of the confined aquifer is not reduced for a long time, under the condition, constructors consider that the water quantity of the confined aquifer is large, water pumping time is prolonged, water pump power is increased, water quantity overstrain is caused, safety standards are exceeded, ground settlement is caused, and deformation of surrounding buildings is caused seriously.
Disclosure of Invention
Aiming at the defects in the prior art, the first purpose of the invention is to provide a precipitation well structure for separating adjacent aquifers, which can effectively cut off the hydraulic connection between the upper aquifer and the lower aquifer and can carry out targeted precipitation or water level observation on a target aquifer.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the utility model provides a cut off precipitation well structure of adjacent aquifer, includes the well body, and the filter tube of well body lower half section inserts to the target aquifer, and the well body outside sets up between adjacent aquifer and cuts off the structure, cuts off the structure and has the height of settlement, and the inboard laminating well body outer wall setting, the outside is laminated with the soil body.
According to the dewatering well structure, the filter pipes are inserted into the target aquifer, dewatering or water level observation can be carried out on the target aquifer in a targeted mode, the partition structure is arranged between the adjacent aquifers, hydraulic connection between the target aquifer and the upper aquifer is separated, and serial stratum pollution of the aquifers of the deep and shallow layers is avoided.
The dewatering well structure for separating the adjacent aquifers is characterized in that the separation is constructed as an air bag.
In some embodiments, the partition is configured as a liquid bag, and the liquid is water.
In a second aspect, a second object of the present invention is to provide a backfill method for isolating adjacent aquifers outside a well wall, wherein a bladder is arranged between two adjacent aquifers outside the well body, the bladder is filled with water or inflated to a sufficient pressure, hydraulic connection between a target aquifer and an upper aquifer of the upper aquifer can be effectively isolated through physical means, a precipitation well can be facilitated to perform targeted precipitation on the target aquifer, and the water level of the target aquifer can be accurately obtained.
A method for backfilling the outside of a well wall by separating adjacent aquifers is characterized in that a separation structure is arranged between two adjacent aquifers on the outer side of a well body, and hydraulic connection between the two adjacent aquifers is separated through the separation structure.
According to the method for backfilling the outside of the well wall for separating the adjacent aquifers, the inner side of the separation structure is attached to the outer wall of the well body, the outer side of the separation structure is attached to the soil body, the water of the aquifer of the upper layer is effectively prevented from flowing to the target aquifer, and the hydraulic supply is avoided.
The method for backfilling outside the well wall for separating the adjacent aquifers is characterized in that the separation is constructed by an air bag.
The extrawell backfill method for isolating adjacent aquifers is characterized in that the isolation is constructed into a liquid bag.
The air bag or the liquid bag is annular, the annular bag is hollow initially, the top of the annular bag is provided with an opening, the opening is connected with an inflating device or a water injection device through a pipeline, and after the bag is arranged outside a well body, gas or liquid is filled into the bag through the inflating device or the water injection device.
The method for backfilling the outside of the well wall for isolating the adjacent aquifers comprises the following steps:
measuring well position, drilling to form a hole;
lowering a filter pipe and a well pipe through a drill hole, wherein the filter pipe is placed at the position of a target aquifer, and the well pipe is distributed at the position of an upper aquifer of the target aquifer;
filling a first filter material around the filter pipe;
and a bag with a set height is arranged above the first filter material and on the peripheral side of the well pipe, and liquid with a set volume or gas with a set pressure is injected into the bag, so that the bag fills the space between the outer wall of the well pipe and the soil body.
According to the method for backfilling the outside of the well wall for isolating the adjacent aquifers, after liquid or gas is injected into the bag, the second filter material is filled above the bag and on the peripheral side of the well pipe, and clay is backfilled above the second filter material.
The first filter material and the second filter material can be the same and are permeable materials.
According to the method for backfilling the outside of the well wall for isolating the adjacent aquifers, before the well logging position is measured, the depth and the thickness of the target aquifer are determined according to the geological condition of the soil body, and the position of the aquifer is determined.
The beneficial effects of the invention are as follows:
1) According to the invention, through the arrangement of the partition structure, the hydraulic connection between the target aquifer and the upper aquifer can be effectively solved, and the pollution caused by hydraulic flow between the two aquifers is avoided, so that the independent precipitation of the target aquifer is ensured, and the accurate observation of the water level of the target aquifer is ensured.
2) The invention not only effectively plays a role of water insulation, but also is conveniently arranged at the outer side of the well body through the arrangement of the air bag or the liquid bag.
3) According to the construction method, the construction method is simple and easy to operate, the excessive extraction of the target aquifer can be effectively avoided, the ground settlement is avoided, and the safety of foundation pit construction is ensured.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
Fig. 1 is a top view of a dewatering well structure partitioning adjacent aquifers according to one or more embodiments of the present invention.
Fig. 2 is a schematic cross-sectional view of a dewatering well structure for partitioning adjacent aquifers according to one or more embodiments of the present invention.
In the figure: the spacing or dimensions between each other are exaggerated to show the location of the various parts, and the schematic is shown only schematically.
Wherein: 1. a ground foundation; 2. filling the area; 3. a well pipe; 4. a bladder; 5. a filter tube; 6. an inflation device or a water injection device; 7. a first filter material; 8. a second filter material; 9. a pipeline; 10. clay balls.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, unless the invention expressly state otherwise, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;
for convenience of description, the words "up", "down", "left" and "right" in the present invention, if any, merely indicate correspondence with up, down, left and right directions of the drawings themselves, and do not limit the structure, but merely facilitate the description of the invention and simplify the description, rather than indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
Term interpretation section: the terms "mounting," "connecting," "fixing," and the like in the present invention should be understood broadly, for example, they may be fixed, detachable, or integrated; the two components can be connected mechanically or electrically, directly or indirectly through an intermediate medium, or connected internally or in an interaction relationship, and the terms used in the present invention should be understood as having specific meanings to those skilled in the art.
As introduced by the background technology, in the prior art, the foundation pit construction has certain safety problems caused by the fact that the hydraulic power between two adjacent aquifers is connected, and in order to solve the technical problems, the invention provides a precipitation well structure for separating the adjacent aquifers and a backfill method outside a well wall.
Example one
In a typical embodiment of the present invention, referring to fig. 1 and 2, a dewatering well structure for partitioning adjacent aquifers comprises a well body, wherein the well body comprises a filter pipe and a well pipe arranged above the filter pipe, the filter pipe is connected with the well pipe 3, the filter pipe 5 in the lower half section of the well body is inserted into a target aquifer through a drill hole, the filter pipe is provided with a plurality of through holes for water flowing, a partition structure is arranged between the adjacent aquifers on the outer side of the well body, the partition structure has a set height, the inner side of the partition structure is arranged to be attached to the outer wall of the well body, the outer side of the partition structure is attached to a soil body, and the partition structure is arranged above a first filter material 7 on the outer side of the filter pipe.
In some examples, the partition is configured as a bladder 4, which may be an air bladder, and in other examples, the partition is configured as a liquid bladder, which is water.
Specifically, no matter the air bag or the liquid bag is in an annular shape, the annular bag is hollow initially, an opening is formed in the top of the annular bag, the opening is connected with an inflating device or a water injection device through a pipeline, the pipeline is connected with the opening in a sealing mode, and after the bag is arranged on the outer side of a well body, gas or liquid is filled into the bag 4 through the inflating device or the water injection device 6.
Considering the close contact between the bag and the soil body to avoid the water flowing through the peripheral side of the bag, the fluff is arranged on the side of the bag contacted with the soil body, and the reliability of the bag contacted with the soil body after being filled with gas or liquid is improved.
It is understood that the partition structure is installed to block hydraulic communication and water flow between the target aquifer and the upper aquifer, and the partition structure is installed above the target aquifer and has a set height, and the height of the partition structure is determined by the distance between the target aquifer and the upper aquifer to ensure strength.
Example two
A backfill method outside a well wall for isolating adjacent aquifers can effectively isolate hydraulic connection between a target aquifer and an upper aquifer on the upper aquifer, is beneficial to targeted precipitation of the target aquifer by a precipitation well, and is beneficial to accurately obtaining the water level of the target aquifer.
A partition structure is arranged between two adjacent aquifers on the outer side of the well body, and hydraulic connection of the two adjacent aquifers on the outer side of the well wall is blocked through the partition structure. The inner side of the partition structure is attached to the outer side wall of the well body, the outer side of the partition structure is attached to the soil body, the adjacent aquifers and the target aquifers are effectively prevented from flowing mutually, and hydraulic connection between the target aquifers and the adjacent aquifers is avoided.
In some examples, the partition is configured as an air bladder, in other examples, the partition is configured as a liquid bladder, and the liquid is water; the air bag or the liquid bag is annular, the thickness of the annular bag is larger than or equal to the distance between the outer wall of the well pipe and the inner side of the soil body, the annular bag is hollow initially, an opening is formed in the top of the annular bag, the opening is connected with an inflating device or a water injection device 6 through a pipeline 9, the pipeline 9 is arranged on the outer side of the well pipe 3, and after the bag 4 is arranged on the outer side of the well body, gas or liquid is filled into the bag through the inflating device or the water injection device.
Considering the close contact between the bag and the soil body, the side of the bag in contact with the soil body is provided with the villus, so that the reliability of the bag in contact with the soil body after being filled with gas or liquid is improved.
Specifically, the method for backfilling the outside of the well wall for separating the adjacent aquifers comprises the following steps:
1) According to the geological condition of a soil body, determining the depth and the thickness of a target water-bearing layer and determining the position of a water-resisting layer;
2) Determining the depth of a well body, the position of a filter tube and the length of the filter tube by combining the characteristics of a target aquifer;
3) Measuring a well position from a ground foundation 1, drilling to form a hole, wherein the large size of the drilled hole is larger than the outer diameter of the well pipe, and a set space is formed between the outer side of the well pipe and a soil body to form a filling area 2;
4) Lowering a filter pipe 5 and a well pipe 3 through a drill hole, wherein the filter pipe is arranged at the position of a target aquifer, and the well pipe is arranged at the position of an upper aquifer of the target aquifer;
5) Filling a first filter material 7 around the filter pipe, wherein the filling height of the first filter material is consistent with the height of the filter pipe, and the height of the filter pipe is consistent with the depth of a target aquifer;
6) A bag 4 with a set height is arranged above the first filter material 7 and on the periphery of the well pipe, and liquid with a set volume or gas with a set pressure is injected into the bag, so that after the bag is filled, the space between the outer wall of the well pipe and the soil body can be filled.
After injecting liquid or gas into the bag, a second filtering material 8 is filled above the bag and around the well pipe, the second filtering material has a set height, the height of the second filtering material is the same as that of the upper aquifer, and clay 10 is filled above the second filtering material.
It will be appreciated that the target aquifer is typically a set distance from the upper aquifer, and the vertical height of the partition formation preferably coincides with the distance between the two, or in some examples, the height of the partition formation may be lower than the distance between the two.
Wherein, the first filtering material and the second filtering material can be the same and are coarse sand or fine sand.
After the construction is completed, a seal end cap is provided at the other end of the pipe line opposite to the opening, the seal end cap and the pipe line can be connected through a screw thread, the pipe line is a hose, and a part of the pipe line can be arranged outside the well pipe.
In the above two embodiments, the material of the bladder is preferably rubber, and is not easily broken.
According to the dewatering well structure for separating adjacent aquifers and the method for backfilling outside the well wall, the target aquifer can be targetedly dewatered through the filter pipe, or the water level of the target aquifer can be accurately observed, so that the stratum-crossing pollution of the aquifer of a deep layer and a shallow layer is avoided, safety accidents caused by the flowing of water of the adjacent layers cannot happen, and the construction safety of a foundation pit is effectively guaranteed. The method can also be used in certain regions with strict requirements on water level observation data, and can accurately observe the water level of a target water-bearing stratum, for example, in some cities containing more spring water, the spring water needs to be protected, and the accurate water level observation is carried out on water-bearing strata in Ordovician systems, hanwu systems and the like of spring water sensitive regions.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. A precipitation well structure for separating adjacent aquifers is characterized by comprising a well body, wherein the well body comprises filter pipes and well pipes arranged above the filter pipes, the filter pipes of the lower half section of the well body are inserted into a target aquifer, a separation structure is arranged between the adjacent aquifers at the outer side of the well body, the separation structure has a set height, the inner side of the separation structure is attached to the outer wall of the well body, the outer side of the separation structure is attached to a soil body, the separation structure is arranged above a first filter material outside the filter pipes, a second filter material is filled above the separation structure and on the peripheral side of the well pipes, the second filter material has a set height, the height of the second filter material is the same as that of the aquifer at the upper layer, and clay is filled above the second filter material; the partition structure effectively blocks the mutual flow of the adjacent aquifers and the target aquifer, avoids the hydraulic connection between the target aquifer and the adjacent aquifers so as to ensure the independent precipitation of the target aquifer and ensure that the observed water level of the target aquifer is accurate;
the partition is constructed into a bag, and after the bag is arranged outside the well body, gas or liquid is filled into the bag through an inflating device or a water injection device;
the side of the bag in contact with the soil body is provided with villi, and the villi improves the reliability of the bag in contact with the soil body after being filled with gas or liquid.
2. The dewatering well structure for partitioning an adjacent aquifer according to claim 1, wherein the partition is constructed as an air bag.
3. The dewatering well structure for partitioning an adjacent aquifer according to claim 1, wherein the partition is constructed as a liquid bag.
4. A method for backfilling the outside of the well wall of a dewatering well for isolating adjacent aquifers is characterized in that after a well body is constructed, an isolation structure is arranged between two adjacent aquifers on the outside of the well body, and hydraulic connection of the two adjacent aquifers is isolated through the isolation structure;
the method comprises the following steps:
measuring well position, drilling to form a hole;
lowering a filter pipe and a well pipe through a drill hole, wherein the filter pipe is arranged at the position of a target aquifer, and the well pipe is arranged at the position of an upper aquifer of the target aquifer;
filling a first filter material around the filter pipe;
arranging a bag with a set height above the first filter material and on the peripheral side of the well pipe, and injecting liquid with a set volume or gas with a set pressure into the bag to fill the space between the outer wall of the well pipe and a soil body with the bag;
after injecting liquid or gas into the bag, filling a second filter material above the bag and around the well pipe, and filling clay above the second filter material.
5. The method as claimed in claim 4, wherein the inner side of the partition structure is attached to the outer wall of the well body, and the outer side of the partition structure is attached to the soil body.
6. The method as claimed in claim 4, wherein the partition is constructed as an air bag.
7. The method of claim 4, wherein the partition is constructed as a liquid bag.
8. The method as claimed in claim 4, wherein before the well location is measured, the depth and thickness of the target aquifer are determined and the position of the water-resisting layer is determined according to the geological condition of the soil.
CN202010647333.9A 2020-07-07 2020-07-07 Dewatering well structure for separating adjacent aquifers and method for backfilling outside well wall Active CN111980044B (en)

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CN114439047A (en) * 2022-01-27 2022-05-06 中国地质科学院矿产综合利用研究所 Method for controlling, guiding and preventing seepage of pollution of tailing pond

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CN203569578U (en) * 2013-10-23 2014-04-30 天津大学 Recharge well capable of preventing well casing blocking and water bursting
CN109356181A (en) * 2018-10-12 2019-02-19 武汉市市政建设集团有限公司 A kind of deep basal pit mixing dewatering well for multilayer aquifer system design
CN109629573A (en) * 2019-01-15 2019-04-16 中交哈尔滨地铁投资建设有限公司 A kind of pouch slip casting borehole wall water sealing structure

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