CN212534293U - Structure for exploiting underground water in low-permeability thin aquifer - Google Patents
Structure for exploiting underground water in low-permeability thin aquifer Download PDFInfo
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Abstract
The utility model discloses a structure of exploiting groundwater in hyposmosis thin aquifer. The structure of the utility model comprises a strong-permeability aquifer, a water collecting well and an anti-overflow aquifer, wherein the water collecting well is arranged between the strong-permeability aquifer and the anti-overflow aquifer and is sequentially and closely connected with the strong-permeability aquifer and the anti-overflow aquifer; the high-permeability water-bearing layer consists of a first gravel material layer at the bottom and a backfill soil layer on the top surface, and the first gravel material layer is adjacent to the backfill soil layer; the anti-overflow aquifer is composed of a uniform thickness section and a gradual change section at the bottom and a backfill soil layer on the top surface, and the uniform thickness section and the gradual change section are adjacent to the backfill soil layer. This structure is through constructing the strong infiltration aquifer, groundwater water conservancy slope, seepage overflow area etc. in can the thin aquifer of increase hyposmosis make groundwater seepage overflow to the strong infiltration aquifer of horizontal trough-like to the seepage flow collects the sump pit department of low reaches, extracts great groundwater yield from it, reaches the engineering design purpose.
Description
Technical Field
The utility model belongs to the technical field of hydrogeological engineering, a technical method of exploiting groundwater with horizontal seepage well is related to, specifically speaking are structures of exploiting groundwater in hyposmosis thin aquifer.
Background
Groundwater is one of the most important resources supporting socioeconomic development. In many places, the thickness of the water-containing layer of underground water is thin, the permeability is poor, and underground water resources are difficult to develop and utilize. For example, the lithology of a fourth water-bearing stratum in a certain place is argillaceous gravel pebbles, the permeability is poor, the water-bearing stratum thickness is 2.5-12 m, the water-rich property is poor, and the water-bearing stratum is a hydrological geological unit with a stable water-bearing stratum supply source.
At present, the exploitation of underground water resources adopts a conventional vertical well for exploitation, but because many local underground water resources are present in a thin aquifer mainly comprising argillaceous gravel pebbles and the like, the stratum has poor permeability, and when the vertical well is used for exploitation, the water quantity is very small, or the water outlet is discontinuous and the like, which can not meet the water supply requirement or is meaningless.
Therefore, a new well structure and a new mining method are needed to achieve the purpose of mining and obtaining a larger amount of underground water resources in a low-permeability thin aquifer.
Disclosure of Invention
An object of the utility model is to provide a structure of exploiting groundwater in hyposmosis thin aquifer through building the strong infiltration aquifer, can increase groundwater water conservancy slope in the weak aquifer, infiltration area for more groundwater seeps to the horizontal groove form and permeates the aquifer by force, and the seepage collects the sump pit department in low reaches, from extracting great groundwater volume, reaches the engineering design purpose.
In order to achieve the purpose, the structure for exploiting underground water in the low-permeability thin aquifer comprises a strong-permeability aquifer, a water collecting well and an anti-overflow aquifer, wherein the water collecting well is arranged between the strong-permeability aquifer and the anti-overflow aquifer, and the three are sequentially and tightly connected according to the runoff direction of underground water; the strong-permeability aquifer consists of a non-aqueous rock-soil layer at the bottom, a first gravel material layer in the middle and a backfill soil layer on the top surface, wherein the non-aqueous rock-soil layer, the first gravel material layer and the backfill soil layer are sequentially adjacent from bottom to top; the anti-overflow aquifer is composed of a non-aqueous rock-soil layer, a low-permeability weak aquifer, a second gravel material layer and a backfill soil layer on the top surface which are sequentially and tightly connected from bottom to top, and a horizontal section and a raised section are arranged in the low-permeability weak aquifer; the horizontal section is parallel to the non-aqueous rock-soil layer, and an upward inclined slope is formed between the uplift section and the non-aqueous rock-soil layer; the second gravel layer in the anti-overflow water-containing layer is correspondingly provided with a uniform thickness section and a gradual change section, the uniform thickness section, the water-free rock-soil layer and the horizontal section are parallel, and the gradual change section is tightly connected with the bulge section; the gravel material of the first gravel material layer is gravel, and the particle size of the gravel is 3-20 mm; the backfill soil layer is a rock-soil body excavated in the original construction site.
And a water seepage pipe is arranged in the strong-permeability aquifer, and the tail end of the water seepage pipe is communicated with the wall of the water collecting well.
The utility model relates to a method for exploiting groundwater in hyposmosis thin aquifer, the construction step is as follows:
1) building a strong permeable aquifer: excavating to a non-aqueous rock-soil layer of a construction site in a construction site area, wherein the construction site area is excavated into a regular long groove shape, and the section of the construction site area is rectangular or trapezoidal; gravel materials are backfilled below the in-situ water level line in the regular long groove shape, and backfill soil layers are constructed above the in-situ water level line in the regular long groove shape by backfilling original excavated rock-soil bodies to construct a forced permeable aquifer;
2) building a water collecting well: building a water collecting well at the downstream end of the strong-permeability aquifer, wherein the depth of the water collecting well is greater than the thickness of the strong-permeability aquifer, the water collecting well is arranged in the non-aqueous rock-soil layer, and the non-aqueous rock-soil layer is excavated into a cylindrical or truncated cone-shaped groove;
3) building an anti-overflow aquifer: excavating to a low-permeability weak aquifer in an unearthed site on one side of the water collecting well, wherein the excavation is in a regular long-groove shape, and the section of the excavation is rectangular or trapezoidal; an upstream section of the excavated low-permeability weak aquifer, which is close to one side of the water collecting well, is excavated to be a horizontal section, and a downstream section of the anti-overflow aquifer is excavated to be a bottom even slope uplift section; gravel materials are backfilled above the low-permeability weak aquifer and below an in-situ water level line, and rock-soil bodies excavated in an original construction site are backfilled above the in-situ water level line to build an anti-overflow aquifer; the newly-built strong permeability aquifer of this horizontal seepage well permeability is strong, the permeability of the hyposmosis weak aquifer of former stratum is poor, groundwater seepage goes out to the downstream runoff, terminal, the sump pit of strong permeability aquifer is weak because of the permeability of former stratum, this section can cause (permeable) water layer because of the permeability shock fall groundwater spills over the earth's surface, for avoiding groundwater to spill over the earth's surface in sump pit department, construct the anti-overflow aquifer, can lead groundwater to the construction site extra-terrestrial (the zone of low reaches) through the anti-overflow aquifer when not producing.
The water seepage pipe is arranged in the middle of the bottom of the first gravel material layer.
The diameter phi of the water seepage pipe is 0.20-0.50m, and the porosity is 20-30% (the porosity of the water seepage pipe is the ratio of the open area of the water inlet surface of the water seepage pipe to the surface area of the water inlet surface of the water seepage pipe).
The length L of the strong-permeability aquifer is 50-100m, the width W is 1.0-4.0m, and the depth H is 4.0-7.0 m;
the depth h of the water collecting well is 6.0-9.0m, and the well pipe diameter D of the water collecting well is 0.3-3.0 m; the well pipe of the water collecting well is arranged to be a solid pipe above the in-situ groundwater level line, a strainer is arranged below the groundwater level line, and the porosity of the strainer is 20-30% (the porosity of the strainer is the ratio of the open area of the water inlet surface of the strainer to the surface area of the water inlet surface of the strainer).
The length L ' of the anti-overflow aquifer is 10-20m, the width W ' is 1.0-3.0m, and the depth H ' is 3.0-5.0 m;
and the backfill position of the backfill soil layer is above the original underground water level.
The length ratio of the uniform thickness section to the gradual change section is 1: 1-2: 1, the gradient of the strong infiltration aquifer is basically consistent with the hydraulic gradient of underground water of a construction site; the depth of the uniform thickness section is 3.0-5.0m, and the depth of the tail end of the gradual change section is 0.5-1.0 m.
The included angle between the strong permeable aquifer and the horizontal plane is 0-10 degrees, and the slope of the strong permeable aquifer is close to the hydraulic slope of underground water at the construction site.
The thickness d of the gravel outside the well pipe of the water collecting well is 0.5-0.75m, and d' is 0.5-0.75 m.
The particle size of the gravel is 5-15 mm.
The arrangement direction and angle of the strong infiltration aquifer, the water collecting well and the anti-overflow aquifer are linearly arranged according to the groundwater runoff direction, or the arrangement direction and angle of the strong infiltration aquifer, the water collecting well and the anti-overflow aquifer are arranged according to the construction site terrain condition and the groundwater runoff direction broken line or the curve.
A horizontal seepage well of exploiting groundwater in hyposmosis thin aquifer, its beneficial effect lies in: the horizontal seepage well is an engineering structure which can extract underground water from a low-permeability thin aquifer in a large amount, and can increase the hydraulic gradient and seepage area of underground water in a weak aquifer by constructing a strong-permeability aquifer, so that more underground water seeps into the horizontal trough-shaped strong-permeability aquifer, seepage is collected to a downstream water collecting well, and a larger amount of underground water is extracted from the water collecting well to achieve the purpose of engineering design; this engineering level seepage well design engineering still has following effect:
(1) the project can draw a large amount of underground water from the stratum with low permeability, thin aquifer and weak water-rich property, and solves the problem that the required water quantity can not be drawn from the aquifer in the past;
(2) the project can draw water quantity which is more than that of the common vertical well project from the stratum with good permeability, thin aquifer and strong water-rich property, and solves the problem of large water supply quantity demand;
(3) the engineering can be used for treating the pollutants of the stratum and the aquifer (particularly the pollution of a valley type strip thin aquifer), the polluted underground water at the upstream is collected into a water collecting well through the structure, and the polluted underground water in the stratum is pumped and discharged into an external facility for treatment (interception, collection and pumping drainage).
Drawings
Fig. 1 is a top view of an embodiment of the present invention;
FIG. 2 is a perspective view of the design structure of the sump well of the present invention;
FIG. 3 is a vertical sectional perspective view of the horizontal seepage engineering structure of the present invention;
FIG. 4 is a longitudinal section view of the horizontal seepage engineering structure of the present invention;
FIG. 5 is a longitudinal stratigraphic section of the construction site when the utility model is not excavated;
FIG. 6 is a sectional view of the engineering design of the high permeability aquifer of the present invention;
FIG. 7 is a structural diagram of the water collecting well engineering design of the present invention;
FIG. 8 is a cross-sectional view of the engineering design of the anti-overflow water-containing layer section of the present invention;
fig. 9 is a top view of a similar design of an embodiment of the present invention;
in the figure: 1-strong permeable aquifer, 2-water collecting well, 3-anti-overflow aquifer, 4-uniform thickness section, 5-gradual change section, 6-first gravel layer, 7-backfill soil layer, 8-ground line, 9-low permeable weak aquifer, 10-non-water rock-soil layer, 11-strong permeable aquifer underground water level line, 12-water permeable pipe and 13-in-situ water level line.
Detailed Description
Example 1
As shown in fig. 1-8, the utility model relates to a structure for exploiting underground water in a low-permeability thin aquifer; the structure comprises a strong-permeability aquifer 1, a water collecting well 2 and an anti-overflow aquifer 3, wherein the water collecting well 2 is arranged between the strong-permeability aquifer 1 and the anti-overflow aquifer 3, and the strong-permeability aquifer 1, the anti-overflow aquifer 3 and the water collecting well 2 are sequentially and tightly connected in the groundwater runoff direction; the strong-permeability aquifer 1 consists of a non-aqueous rock-soil layer 10 at the bottom, a first gravel material layer 6 at the middle and a backfill soil layer 7 at the top, wherein the non-aqueous rock-soil layer 10, the first gravel material layer 6 and the backfill soil layer 7 are sequentially adjacent from bottom to top; the anti-overflow water-bearing layer 3 consists of a non-aqueous rock-soil layer 10, a low-permeability weak water-bearing layer 9, a second gravel material layer 6-1 and a backfill soil layer 7 on the top surface which are sequentially and tightly connected from bottom to top, and a horizontal section and a raised section are arranged in the low-permeability weak water-bearing layer 9; the horizontal section is parallel to the non-aqueous rock-soil layer 10, and an upward inclined slope is formed between the uplift section and the non-aqueous rock-soil layer 10; the second gravel material layer 6-1 in the anti-overflow water-bearing layer 3 is correspondingly arranged into a uniform thickness section 4 and a gradual change section 5, the uniform thickness section 4 and the non-aqueous rock-soil layer 10 are parallel to the horizontal section, and the gradual change section 5 is tightly connected with the bump section; the gravel material of the first gravel material layer 6 is gravel, and the particle size of the gravel is 3-5 mm; the backfill soil layer 7 is a rock-soil body excavated in the original construction site.
And a water seepage pipe 12 is arranged in the high-permeability aquifer 1, and the tail end of the water seepage pipe 12 is communicated with the wall of the water collecting well 2.
1) Building a strong permeable aquifer 1: excavating to a non-aqueous rock-soil layer 10 of a construction site in a construction site area, wherein the construction site area is excavated into a regular long groove shape, and the section of the construction site area is rectangular or trapezoidal; backfilling by gravel below the original launching level line 13 in the regular long groove shape, and backfilling by original excavated rock-soil bodies above the original launching level line 13 in the regular long groove shape to build a backfill soil layer 7 and build a strong-permeability aquifer 1;
2) building a water collecting well 2: constructing a water collecting well 2 at the downstream end of the strong-permeability aquifer 1, wherein the depth of the water collecting well 2 is greater than the thickness of the strong-permeability aquifer 1, the water collecting well 2 is arranged in the non-aqueous rock-soil layer 10, and the non-aqueous rock-soil layer 10 is excavated into a cylindrical groove;
3) building an anti-overflow aquifer 3: excavating to a low-permeability weak aquifer 9 in an unearthed site on one side of the water collecting well 2 into a regular long-groove shape, wherein the section of the long-groove shape is rectangular or trapezoidal; an upstream section of the excavated low-permeability weak aquifer 9, which is close to one side of the water collecting well 2, is excavated to be a horizontal section, and a downstream section of the anti-overflow aquifer 3 is excavated to be a bottom even slope uplift section; gravel materials are backfilled above the low-permeability weak aquifer 9 and below an in-situ water level 13, and rock-soil bodies excavated in an original construction site are backfilled above the in-situ water level 13 to build the anti-overflow aquifer 3; the newly-built strong permeability aquifer 1 of this horizontal seepage well is strong, the weak aquifer 9 permeability of hyposmosis of former stratum is poor, groundwater seepage overflows downstream runoff, 1 is terminal at strong permeability aquifer, the permeability of sump pit 2 department because of former stratum is weak, this section can cause contains (permeable) water layer and groundwater spills over the earth's surface because of the permeability slump, for avoiding groundwater to spill over the earth's surface in sump pit 2 department, build anti-overflow aquifer 3, can lead groundwater to outside the construction site (the zone of lower reaches) through anti-overflow aquifer 3 when not producing.
The water seepage pipe 12 is arranged in the middle of the bottom of the first gravel layer 6.
The diameter phi of the water seepage pipe 12 is 0.30m, and the porosity is 20%.
The length L of the strong penetration aquifer 1 is 50m, the width W is 1.5m, and the depth H is 4.0 m;
the depth h of the water collecting well 2 is 6.0m, and the well pipe diameter D of the water collecting well 2 is 0.5 m;
the length L ' of the anti-overflow aquifer 3 is 10m, the width W ' is 1.0m, and the depth H ' is 3.0 m;
the backfill position of the backfill soil layer 7 is above the original underground water level 13.
The length ratio of the uniform thickness section 4 to the gradual change section 5 is 1: 1, the depth of the uniform thickness section 4 is 3.0m, and the depth of the tail end of the gradual change section 5 is 0.5 m.
The strong permeable aquifer 1 is parallel to the horizontal plane, and the gradient of the strong permeable aquifer 1 is close to the hydraulic gradient of underground water at the construction site.
The gravel filling thickness d at the outer side of the well pipe of the water collecting well 2 is 0.5m, and d' is 0.5 m.
The particle size of the gravel is 3-5 mm.
The arrangement directions and angles of the strong-permeability aquifer 1, the water collecting well 2 and the anti-overflow aquifer 3 are linearly arranged according to the groundwater runoff direction.
During the use, horizontal seepage well's use, groundwater in the original place launching line 13 permeates to first gravel bed of material 6 and second gravel bed of material 6-1 in, and the gathering water forms strong infiltration aquifer groundwater level line 11 in first gravel bed of material 6 and the second gravel bed of material 6-1, and groundwater in the strong infiltration aquifer 1 downstream percolates to 2 departments of sump pit, places the suction pump in 2 bottoms of sump pit, draws groundwater resources through sump pit 2.
Example 2
A structure of exploiting groundwater in hyposmosis thin aquifer, build horizontal seepage well step as follows: the horizontal seepage well comprises a strong-permeability aquifer 1, a water collecting well 2 and an anti-overflow aquifer 3, wherein the water collecting well 2 is arranged between the strong-permeability aquifer 1 and the anti-overflow aquifer 3, and the strong-permeability aquifer 1, the anti-overflow aquifer 3 and the water collecting well are sequentially and tightly connected in the groundwater runoff direction; the strong-permeability aquifer 1 consists of a non-aqueous rock-soil layer 10 at the bottom, a first gravel material layer 6 at the middle and a backfill soil layer 7 at the top, wherein the non-aqueous rock-soil layer 10, the first gravel material layer 6 and the backfill soil layer 7 are sequentially adjacent from bottom to top; the anti-overflow water-bearing layer 3 consists of a non-aqueous rock-soil layer 10, a low-permeability weak water-bearing layer 9, a second gravel material layer 6-1 and a backfill soil layer 7 on the top surface which are sequentially and tightly connected from bottom to top, and a horizontal section and a raised section are arranged in the low-permeability weak water-bearing layer 9; the horizontal section is parallel to the non-aqueous rock-soil layer 10, and an upward inclined slope is formed between the uplift section and the non-aqueous rock-soil layer 10; the second gravel material layer 6-1 in the anti-overflow water-bearing layer 3 is correspondingly arranged into a uniform thickness section 4 and a gradual change section 5, the uniform thickness section 4 and the non-aqueous rock-soil layer 10 are parallel to the horizontal section, and the gradual change section 5 is tightly connected with the bump section; the gravel material of the first gravel material layer 6 is gravel, and the particle size of the gravel is 5-15 mm; the backfill soil layer 7 is a rock-soil body excavated in the original construction site.
The utility model relates to a method for exploiting groundwater in hyposmosis thin aquifer, the construction step is as follows:
1) building a strong permeable aquifer 1: excavating to a non-aqueous rock-soil layer 10 of a construction site in a construction site area, wherein the construction site area is excavated into a regular long groove shape, and the section of the construction site area is rectangular or trapezoidal; backfilling by gravel below the original launching level line 13 in the regular long groove shape, and backfilling by original excavated rock-soil bodies above the original launching level line 13 in the regular long groove shape to build a backfill soil layer 7 and build a strong-permeability aquifer 1;
2) building a water collecting well 2: constructing a water collecting well 2 at the downstream end of the strong-permeability aquifer 1, wherein the depth of the water collecting well 2 is greater than the thickness of the strong-permeability aquifer 1, the water collecting well 2 is arranged in the non-aqueous rock-soil layer 10, and the non-aqueous rock-soil layer 10 is excavated into a truncated cone-shaped groove;
3) building an anti-overflow aquifer 3: excavating to a low-permeability weak aquifer 9 in an unearthed site on one side of the water collecting well 2 into a regular long-groove shape, wherein the section of the long-groove shape is rectangular or trapezoidal; an upstream section of the excavated low-permeability weak aquifer 9, which is close to one side of the water collecting well 2, is excavated to be a horizontal section, and a downstream section of the anti-overflow aquifer 3 is excavated to be a bottom even slope uplift section; gravel materials are backfilled above the low-permeability weak aquifer 9 and below an in-situ water level 13, and rock-soil bodies excavated in an original construction site are backfilled above the in-situ water level 13 to build the anti-overflow aquifer 3; the newly-built strong permeability aquifer 1 of this horizontal seepage well is strong, the weak aquifer 9 permeability of hyposmosis of former stratum is poor, groundwater seepage overflows downstream runoff, 1 is terminal at strong permeability aquifer, the permeability of sump pit 2 department because of former stratum is weak, this section can cause contains (permeable) water layer and groundwater spills over the earth's surface because of the permeability slump, for avoiding groundwater to spill over the earth's surface in sump pit 2 department, build anti-overflow aquifer 3, can lead groundwater to outside the construction site (the zone of lower reaches) through anti-overflow aquifer 3 when not producing.
The length L of the strong penetration aquifer 1 is 100m, the width W is 2.5m, and the depth H is 7.0 m;
the depth h of the water collecting well 2 is 9.0m, and the well pipe diameter D of the water collecting well 2 is 1.0 m;
the length L ' of the anti-overflow aquifer 3 is 20m, the width W ' is 2.0m, and the depth H ' is 5.0 m;
the backfill position of the backfill soil layer 7 is above the original underground water level 13.
The length ratio of the uniform thickness section 4 to the gradual change section 5 is 2: 1, the gradient of the strong infiltration aquifer is consistent with the hydraulic gradient of underground water of a construction site; the depth of the uniform thickness section 4 is 5.0m, and the depth of the tail end of the gradual change section 5 is 1.0 m.
The included angle between the strong infiltration aquifer 1 and the horizontal plane is 10 degrees, and the slope of the strong infiltration aquifer 1 is close to the hydraulic slope of underground water at the construction site.
The gravel packing thickness d outside the well pipe of the water collecting well 2 is 0.75m, and d' is 0.75 m.
The particle size of the gravel is 5-15 mm.
The arrangement directions and angles of the strong-permeability aquifer 1, the water collecting well 2 and the anti-overflow aquifer 3 are arranged according to the topographic conditions of the construction site and broken lines of the groundwater runoff direction.
During the use, horizontal seepage well's use, groundwater in the original place launching line 13 permeates to first gravel bed of material 6 and second gravel bed of material 6-1 in, and the gathering water forms strong infiltration aquifer groundwater level line 11 in first gravel bed of material 6 and the second gravel bed of material 6-1, and groundwater in the strong infiltration aquifer 1 downstream percolates to 2 departments of sump pit, places the suction pump in 2 bottoms of sump pit, draws groundwater resources through sump pit 2.
Example 3
As shown in figures 1-8, the utility model relates to a structure of exploiting groundwater in hyposmosis thin aquifer, with embodiment 1, 8-12 months in 2019, according to the engineering design scheme requirement, build horizontal seepage well engineering in Min county, Gansu province.
The local construction site is a debris flow valley, the lithology of a water-bearing layer in the valley is argillaceous gravel pebbles (boulders), the thickness of the water-bearing layer is about 4.0m, the buried depth of an underground water level is 1.0m, the permeability coefficient is 3.0-4.0 m/d, and a low-permeability weak water-rich water-bearing layer is arranged in the valley area of the river section.
According to the hydrogeological condition, a groove-shaped strong infiltration aquifer 1 (with the length of 100m, the depth of 5m, the bottom of 2.5m and the width of the upper part of 4.5-5.0 m) is designed to have a trapezoidal section, a water infiltration pipe 12 with the length of 100m is arranged in the middle of the bottom of the strong infiltration aquifer 1, gravels with the grain diameter of 5-10 mm are backfilled at the lower part, and muddy gravel pebbles are excavated in an original backfilling field with the grain diameter of 1.0m on the surface layer; a water collecting well 2 is built at the tail end of the strong permeable aquifer 1, the depth of the water collecting well 2 is 7.0m, the well diameter is 1.0m, a concrete well pipe is arranged, 2m of the upper part of a well pipe of the water collecting well 2 is set as a solid pipe, 5m of the lower part of the well pipe of the water collecting well 2 is set as a water filter pipe, a nylon net with 80 meshes is coated outside the water filter pipe, gravel with the grain diameter of 5-10 mm is backfilled on the periphery of the water filter pipe, and the gravel is; an anti-overflow aquifer 3 (with the length of 30m, the bottom width of 2.0m and the upper width of 3m) is designed at the downstream section of the water collecting well 2, wherein the depth of the uniform thickness section 4 is 4m, the length is 20m, the thickness of the gradual change section 5 is gradually changed into 2m from 4m, gravel with the particle size of 5-10 mm is backfilled at the lower part of 3.0-1.0 m, and muddy gravel pebbles excavated in the original site are backfilled at the surface layer of 1 m; 2 observation holes are arranged in the engineering.
After the horizontal seepage well engineering is built according to the design, the water inflow is determined to be 360m through a water pumping test3D, 220m over the engineering design requirement3And d. The aim of engineering design is achieved, and the method is transferred to a production well of a water source place of a proposed area.
Comparative test
Constructing conventional vertical wells in the sections with the same water-bearing layer thickness in the construction area, and determining the water inflow amount to be 60m through a water pumping test3D or water yield is not continuous (the pump capacity of the water pump is 2.5 m)3/h)。
Synthesize above-mentioned contrast test and know, a exploitation volume of horizontal seepage well of exploiting groundwater in hyposmosis thin aquifer surpasss the 220m that engineering design required3And d, the water taking amount is more than five times of that of the conventional vertical well.
Example 4
As shown in figures 2-9, a horizontal seepage well for exploiting groundwater in a low-permeability thin aquifer, the structure is the same as embodiment 1, the arrangement direction and the angle of the high-permeability aquifer 1, the water collecting well 2 and the anti-overflow aquifer 3 are arranged according to the topographic conditions of a construction site and the runoff direction curve of groundwater.
Claims (10)
1. A structure for producing groundwater in a low permeability thin aquifer, characterized by: the system comprises a strong-permeability aquifer (1), a water collecting well (2) and an anti-overflow aquifer (3), wherein the water collecting well (2) is arranged between the strong-permeability aquifer (1) and the anti-overflow aquifer (3), and the strong-permeability aquifer, the anti-overflow aquifer and the anti-overflow aquifer are sequentially and tightly connected in the groundwater runoff direction; the strong-permeability water-bearing stratum (1) consists of a non-aqueous rock-soil layer (10) at the bottom, a first gravel material layer (6) in the middle and a backfill soil layer (7) on the top surface, wherein the non-aqueous rock-soil layer (10), the first gravel material layer (6) and the backfill soil layer (7) are sequentially adjacent from bottom to top; the anti-overflow water-bearing layer (3) is composed of a non-aqueous rock-soil layer (10), a low-permeability weak water-bearing layer (9), a second gravel material layer (6-1) and a backfill soil layer (7) on the top surface, which are sequentially and tightly connected from bottom to top, and a horizontal section and a raised section are arranged in the low-permeability weak water-bearing layer (9); the horizontal section is parallel to the non-aqueous rock-soil layer (10), and an upward inclined slope is formed between the uplift section and the non-aqueous rock-soil layer (10); the second gravel material layer (6-1) in the anti-overflow water-bearing layer (3) is correspondingly arranged into a uniform thickness section (4) and a gradual change section (5), the uniform thickness section (4) and the non-aqueous rock-soil layer (10) are parallel to the horizontal section, and the gradual change section (5) is tightly connected with the bump section; the gravel material of the first gravel material layer (6) is gravel, and the particle size of the gravel is 3-20 mm; the backfill soil layer (7) is a rock-soil body excavated in the original construction site.
2. A structure for producing groundwater in a low permeability thin aquifer according to claim 1, wherein: and a water seepage pipe (12) is arranged in the strong-permeability water-bearing layer (1), and the tail end of the water seepage pipe (12) is communicated with the wall of the water collecting well (2).
3. A structure for producing groundwater in a low permeability thin aquifer according to claim 2, wherein: the water seepage pipe (12) is arranged in the middle of the bottom of the first gravel material layer (6).
4. A structure for producing groundwater in a low permeability thin aquifer according to claim 2, wherein: the diameter phi of the water seepage pipe (12) is 0.20-0.50m, and the porosity is 20-30%.
5. A structure for producing groundwater in a low permeability thin aquifer according to claim 4, wherein: the length L of the strong permeable aquifer (1) is 50-100m, the width W is 1.0-4.0m, and the depth H is 4.0-7.0 m;
the depth h of the water collecting well (2) is 6.0-9.0m, and the well pipe diameter D of the water collecting well (2) is 0.3-3.0 m;
the length L ' of the anti-overflow water-containing layer (3) is 10-20m, the width W ' is 1.0-2.0m, and the depth H ' is 3.0-5.0 m;
the backfill position of the backfill soil layer (7) is above the original underground water level line (13).
6. A structure for producing groundwater in a low permeability thin aquifer according to claim 5, wherein: the length ratio of the uniform thickness section (4) to the gradual change section (5) is 1: 1-2: 1; the depth of the uniform thickness section (4) is 3.0-5.0m, and the depth of the tail end of the gradual change section (5) is 0.5-1.0 m.
7. A structure for producing groundwater in a low permeability thin aquifer according to claim 6, wherein: the included angle between the strong permeable aquifer (1) and the horizontal plane is 0-10 degrees.
8. A structure for producing groundwater in a low permeability thin aquifer according to claim 7, wherein: the gravel filling thickness d at the outer side of the well pipe of the water collecting well (2) is 0.5-0.75m, and d' is 0.5-0.75 m.
9. A structure for producing groundwater in a low permeability thin aquifer according to claim 8, wherein: the particle size of the gravel is 5-15 mm.
10. A structure for producing groundwater in a low permeability thin aquifer according to claim 1, wherein: the strong water-bearing layer (1), the water collecting well (2) and the anti-overflow water-bearing layer (3) are arranged in a straight line mode according to the groundwater runoff direction, or the strong water-bearing layer (1), the water collecting well (2) and the anti-overflow water-bearing layer (3) are arranged in a broken line mode or in a curved line mode according to the construction site terrain condition and the groundwater runoff direction.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111945825A (en) * | 2020-08-17 | 2020-11-17 | 甘肃省地质调查院 | Method for exploiting underground water in low-permeability thin aquifer |
| CN111945825B (en) * | 2020-08-17 | 2024-10-25 | 甘肃省地质调查院 | Method for exploiting underground water in low-permeability thin aquifer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111945825A (en) * | 2020-08-17 | 2020-11-17 | 甘肃省地质调查院 | Method for exploiting underground water in low-permeability thin aquifer |
| CN111945825B (en) * | 2020-08-17 | 2024-10-25 | 甘肃省地质调查院 | Method for exploiting underground water in low-permeability thin aquifer |
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