CN114016569A - Internal-drainage strip mine shallow groundwater taking device and taking recovery method - Google Patents
Internal-drainage strip mine shallow groundwater taking device and taking recovery method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000011084 recovery Methods 0.000 title abstract description 15
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- 239000010959 steel Substances 0.000 claims description 9
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B3/00—Methods or installations for obtaining or collecting drinking water or tap water
- E03B3/06—Methods or installations for obtaining or collecting drinking water or tap water from underground
- E03B3/08—Obtaining and confining water by means of wells
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/02—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B3/00—Methods or installations for obtaining or collecting drinking water or tap water
- E03B3/06—Methods or installations for obtaining or collecting drinking water or tap water from underground
- E03B3/08—Obtaining and confining water by means of wells
- E03B3/16—Component parts of wells
- E03B3/18—Well filters
- E03B3/24—Well filters formed of loose materials, e.g. gravel
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B3/00—Methods or installations for obtaining or collecting drinking water or tap water
- E03B3/32—Methods or installations for obtaining or collecting drinking water or tap water with artificial enrichment, e.g. by adding water from a pond or a river
- E03B3/34—Methods or installations for obtaining or collecting drinking water or tap water with artificial enrichment, e.g. by adding water from a pond or a river of underground water
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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Abstract
The invention discloses a shallow groundwater taking device for an internal drainage strip mine and a taking recovery method, wherein the shallow groundwater taking device for the internal drainage strip mine comprises a base layer, a migration layer and a filter layer, wherein the base layer comprises a strip mine end slope, a water barrier layer arranged in the strip mine end slope, a water-containing layer arranged above the water barrier layer and an artificial water barrier layer arranged between the water barrier layer and the water-containing layer; the migration layer is arranged above the base layer and comprises a migration channel arranged above the artificial water-resisting layer and a top water-resisting layer arranged in the migration channel; the filter layer is arranged above the migration layer and sequentially comprises a first filter layer, a second filter layer, a third filter layer, a fourth filter layer, a fifth filter layer and a water taking well penetrating through the filter layer and the migration layer from top to bottom; the underground water migration channel is constructed by adopting common mine strippers, the underground water circulation is recovered, the cost is low, and the effect is good.
Description
Technical Field
The invention relates to the technical field of underground water utilization, in particular to a taking device and a taking recovery method for shallow underground water of an internal-drainage strip mine.
Background
In the process of mining strip mines, shallow groundwater (30-50m) around a mining area is drained frequently to avoid the groundwater from flowing into a production area and affecting production safety. The drainage and drainage wells of the strip mine are generally arranged in a far area outside the boundary of the strip mine area, the arrangement range and the arrangement quantity are large, after the strip mine is mined and internal drainage is realized, if the drainage and drainage wells are removed, shallow groundwater can flow again, and as the internal pores of the drainage field in the strip mine are large, part of groundwater permeates into the drainage field, the stability of the drainage field is seriously reduced, and the normal flow of the groundwater is blocked when the seepage quantity is large; if drainage and drainage are continued, the water level of underground water around the mining area is inevitably reduced, normal migration of the underground water is also greatly influenced, normal living water taking of people in a large range around the mining area is influenced seriously, and meanwhile, the underground water taken out by drainage and drainage is far away from the mining area, so that the transportation cost is high when the underground water is used for mining area production. Therefore, it is urgently needed to provide a way for extracting and recovering shallow groundwater in an inner drainage strip mine, so that the shallow groundwater in a mining area can be reasonably utilized and supplemented in the early stage of ensuring the safety of an inner drainage field of the strip mine, and the organic unification of strip mining and environmental protection can be achieved.
Disclosure of Invention
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.
The invention provides a taking device and a taking recovery method for shallow groundwater of an internal drainage strip mine.
Therefore, an object of the present invention is to provide an apparatus for taking and recovering groundwater from a shallow layer of an internal drainage strip mine, which can replenish groundwater.
In order to solve the technical problems, the invention provides the following technical scheme: a shallow groundwater taking device for an internally-discharged strip mine comprises a base layer, a migration layer and a filter layer, wherein the base layer comprises a strip mine end slope, a water barrier layer arranged in the strip mine end slope, a water-containing layer arranged above the water barrier layer, and an artificial water barrier layer arranged between the water barrier layer and the water-containing layer; the migration layer is arranged above the base layer and comprises a migration channel arranged above the artificial water-resisting layer and a top water-resisting layer arranged in the migration channel; and the filter layer is arranged above the migration layer and sequentially comprises a first filter layer, a second filter layer, a third filter layer, a fourth filter layer, a fifth filter layer and a water taking well penetrating through the filter layer and the migration layer from top to bottom.
As a preferred scheme of the taking device and the taking recovery method for shallow groundwater of the internal drainage strip mine, the taking device comprises the following steps: and a segmented step is arranged between the water-resisting layer and the artificial water-resisting layer.
As a preferred scheme of the taking device and the taking recovery method for shallow groundwater of the internal drainage strip mine, the taking device comprises the following steps: the top layer water-resisting layers are arranged at certain intervals, leakage holes are formed between the top layer water-resisting layers at intervals, and permeable cloth is further arranged in the migration layer.
As a preferred scheme of the taking device and the taking recovery method for shallow groundwater of the internal drainage strip mine, the taking device comprises the following steps: the water taking well comprises a concrete base, a steel ring with a hole and a concrete pipe, wherein the steel ring with the hole and the concrete pipe are arranged above the concrete base.
As a preferred scheme of the taking device and the taking recovery method for shallow groundwater of the internal drainage strip mine, the taking device comprises the following steps: and a vertical water-stop wall is also arranged between the internal-drainage strip mine shallow groundwater taking devices.
As a preferred scheme of the taking device and the taking recovery method for shallow groundwater of the internal drainage strip mine, the taking device comprises the following steps: when the strip mine is internally discharged, strip mine strippers are discharged from the space below the sectional steps, when the internal discharge is close to the sectional steps, strippers which are easy to glue when meeting water in the strip mine are discharged, the artificial water-resisting layer is connected with the water-resisting layers of the end walls at two sides, and a continuous water-resisting layer is formed inside the inner dumping ground.
As a preferred scheme of the taking device and the taking recovery method for shallow groundwater of the internal drainage strip mine, the taking device comprises the following steps: and (3) beginning to discharge hydrophobic rock blocks on the artificial water-resisting layer to form the migration channel, and stopping operation when the upper surface of the migration channel exceeds the upper surface of the original water-containing layer by-m.
As a preferred scheme of the taking device and the taking recovery method for shallow groundwater of the internal drainage strip mine, the taking device comprises the following steps: constructing a filter layer on the top water-resisting layer, wherein the upper surface of the filter layer is flush with the upper surface corresponding to the final design height of the soil discharge field in the strip mine, and the first filter layer intercepts plant debris and other impurities in the incoming water and reduces the turbidity of the water; the second filter layer intercepts silt in the water and reduces turbidity; the third filter layer is made of materials such as permeable bricks or permeable cement; the fourth filter layer is made of the same material as the second filter layer, and the fifth filter layer is made of the same material as the first filter layer; and the fourth filter layer, the fifth filter layer and the permeable cloth prevent small-particle materials from being mixed into the underground water migration channel to cause blockage.
As a preferred scheme of the taking device and the taking recovery method for shallow groundwater of the internal drainage strip mine, the taking device comprises the following steps: the migration channel is continuously widened in the horizontal plane along the strip mine propelling direction, when the width reaches 150-200m, the vertical waterproof wall is vertically constructed from the upper surface of the artificial waterproof layer to the upper surface, the boundary of the vertical waterproof wall is connected with the top waterproof layer, and the migration channel is closed to form an independent closed underground water migration channel.
As a preferred scheme of the taking device and the taking recovery method for shallow groundwater of the internal drainage strip mine, the taking device comprises the following steps: the groundwater taking step comprises:
stopping the drainage and drainage operation around the soil discharge field in the strip mine, and recovering the migration of shallow groundwater;
when the shallow groundwater passes through the migration channel, the shallow groundwater is collected in the water taking well, and a water pumping facility is installed in the water taking well to realize water taking;
monitoring equipment is arranged in the water taking well simultaneously and is used as an observation well to monitor the underground water condition;
when one sealed underground water migration channel is broken or fails, increasing the water pumping force of the water taking well of the sealed underground water migration channel close to the original shallow water-resisting layers on the two sides, ensuring that the underground water does not pass through the underground water migration channel any more, and avoiding the underground water from permeating into the interior of the refuse dump;
the groundwater replenishing step comprises:
arranging a water delivery channel in the strip mine area, wherein the end point of the water delivery channel is positioned on the surface of the filter layer;
when water resources in a mining area are rich or rainfall in the mining area, water is directly discharged or drained to the filter layer, and water passes through the filter layer and then enters the underground water migration channel through the water permeable cloth to supplement water to the underground water.
The invention has the beneficial effects that:
the underground water migration channel is constructed by adopting common mine strippers, the underground water circulation is recovered, the cost is low, and the effect is good. The artificial water-stop wall and the vertical water-stop wall are combined to form a closed underground water migration channel, so that the infiltration into the interior of the refuse dump is avoided, and the stability of the refuse dump is ensured. The underground water migration channels are arranged independently in sections and can be abandoned at any time according to the operation condition, and the overall reliability of the scheme is improved. The artificial water-resisting layer and the top water-resisting layer are matched to form a funnel-shaped underground water migration channel, so that the underground water can be supplemented, and the permeation of the underground water to the filter layer can be reduced to the greatest extent. The filter layers are arranged in a multi-layer mode and can be replaced, the quality of water supply to the underground is guaranteed, and the service life of the system is prolonged. The dual functions of taking water from underground water and replenishing water are realized, long-term drainage and drainage of strip mines are avoided, water is taken from an inner soil discharge field nearly, the requirement of environmental protection is met, and the water consumption cost is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein:
FIG. 1 is a schematic overall structure diagram of the shallow groundwater taking device for the internal drainage strip mine.
FIG. 2 is a schematic view of a water intake well structure of the device for taking shallow groundwater from an internal drainage strip mine.
FIG. 3 is a sectional view of the plane A-A of the shallow groundwater sampling device for the internal drainage strip mine according to the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Furthermore, the present invention is described in detail with reference to the drawings, and in the detailed description of the embodiments of the present invention, the cross-sectional view illustrating the structure of the device is not enlarged partially according to the general scale for convenience of illustration, and the drawings are only exemplary and should not be construed as limiting the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.
Example 1
Referring to fig. 1, for a first embodiment of the invention, a shallow groundwater taking device for an inner drainage strip mine and a taking recovery method are provided, the shallow groundwater taking device for the inner drainage strip mine comprises a base layer 100, a migration layer 200 and a filter layer 300, wherein the base layer 100 comprises a strip mine end slope 101, a water barrier layer 102 arranged in the strip mine end slope 101, an aquifer 103 arranged above the water barrier layer 102, and an artificial water barrier layer 104 arranged between the water barrier layer 102 and the aquifer 103; the migration layer 200 is arranged above the base layer 100 and comprises a migration channel 201 arranged above the artificial water-resisting layer 104 and a top water-resisting layer 202 arranged in the migration channel 201; and the filter layer 300 is arranged above the migration layer 200 and sequentially comprises a first filter layer 301, a second filter layer 302, a third filter layer 303, a fourth filter layer 304, a fifth filter layer 305 and a water taking well 306 penetrating through the filter layer 300 and the migration layer 200 from top to bottom.
A segmented step 102a is provided between the water barrier 102 and the artificial water barrier 104. The top water-resisting layers 202 are arranged at intervals, leakage holes 202a are arranged between the top water-resisting layers 202 at intervals, and the migration layer 200 is also internally provided with permeable cloth 203. The water intake well 306 comprises a concrete foundation 306a, a perforated steel ring 306b and a concrete pipe 306c, wherein the perforated steel ring 306b and the concrete pipe are arranged above the concrete foundation 306 a. And a vertical water-stop wall 400 is also arranged between the shallow groundwater taking devices of the inner drainage strip mine.
Wherein, basic unit 100 is the infrastructure of interior row open-pit mine, migration layer 200 forms inside groundwater migration passageway, filter layer 300 is used for filtering groundwater, water barrier 102 is used for keeping apart protection groundwater, prevent its loss, aquifer 103 is the original aquifer of groundwater, original water barrier thickness is strengthened to artifical water barrier 104, migration passageway 201 is used for transporting groundwater, top layer water barrier 202 stores protection groundwater, first filter layer 301, second filter layer 302, third filter layer 303, fourth filter layer 304, fifth filter layer 305 is used for filtering groundwater, water intaking well 306 is used for taking groundwater.
Example 2
Referring to fig. 2 to 3, a second embodiment of the present invention is different from the first embodiment in that: when the open-pit mine is internally discharged, strip materials of the open-pit mine are discharged from the space below the subsection step 102a, when the internal discharge is close to the subsection step 102a, the strip materials which are easy to glue when meeting water in the open-pit mine are discharged, the artificial waterproof layer 104 is connected with the end slope waterproof layers 102 at the two sides, and a continuous waterproof layer is formed inside the internal dumping ground. And (3) beginning to discharge hydrophobic rock blocks on the artificial water-resisting layer 104 to form a migration channel 201, and stopping operation when the upper surface of the migration channel 201 exceeds the upper surface of the original water-containing layer by 2-3 m.
A filter layer 300 is built on the top waterproof layer 202, the upper surface of the filter layer 300 is flush with the upper surface corresponding to the final design height of the soil discharge field in the strip mine, and the first filter layer 301 intercepts plant debris and other impurities in the incoming water and reduces the turbidity of the water; the second filter layer 302 intercepts silt in the water and reduces turbidity; the third filter layer 302 is made of materials such as permeable bricks or permeable cement; fourth filter layer 304 is the same material as second filter layer 302 and fifth filter layer 305 is the same material as first filter layer 301; the permeable cloth is laid under the fifth filter layer 305, and the fourth filter layer 304, the fifth filter layer 305 and the permeable cloth 203 prevent small-particle materials from being mixed into the groundwater migration passage 201 to cause blockage. The migration channel 201 is continuously widened in the horizontal plane along the advancing direction of the open pit, when the width reaches 150-200m, a vertical water-stop wall 400 is vertically constructed upwards from the upper surface of the artificial water-stop layer 104, the upper boundary of the vertical water-stop wall 400 is connected with the top-layer water-stop layer 202, the migration channel 201 is closed, and an independent closed underground water migration channel 201 is formed.
The groundwater taking step comprises:
(1) stopping the drainage and drainage operation around the soil discharge field in the strip mine, and recovering the migration of shallow groundwater;
(2) when the shallow groundwater passes through the migration channel 201, the shallow groundwater is collected in the water taking well 306, and a water pumping facility is installed in the water taking well to realize water taking;
(3) monitoring equipment is arranged in the water intake well 306 at the same time, and the monitoring equipment is also used as an observation well for monitoring the underground water condition;
(4) when one closed underground water migration channel 201 is broken or fails, increasing the water taking 306 of the closed underground water migration channel 201 close to the original shallow water-resisting layers 102 on the two sides) to ensure that the underground water does not pass through the closed underground water migration channel 201 any more, and avoiding the underground water from permeating into the interior of the refuse dump;
the groundwater replenishing step comprises:
(1) arranging a water delivery channel in the strip mine area, wherein the terminal point of the water delivery channel is positioned on the surface of the filter layer 300;
(2) when water resources in a mining area are rich or rainfall in the mining area, water is directly discharged or drained to the filter layer 300, and water passes through the filter layer 300 and then passes through the water permeable cloth 203 to enter the underground water migration channel 201, so that water is supplemented to underground water.
Compared with the embodiment 1, further, in the strip mine stripping process, the original shallow water-resisting layer exposed at the end slope of the strip mine is built into the segmented step 102a, and when the thickness of the original shallow water-resisting layer 102 exceeds (including) 20m, the total height of the segmented step 102a is the same as the thickness of the original shallow water-resisting layer 102; when the thickness of the original shallow water-resisting layer 102 is less than 20m, the end slope with a certain height below the lower surface of the original shallow water-resisting layer 102 is also built into a subsection step 102a, and the total height of the final subsection step is ensured to be not less than 20 m. Preferably, the height of each step is not more than 3m, and the width is not more than 5 m.
When the strip mine is internally discharged, strip mine stripping materials are discharged from the space below the subsection step 102a, and normal internal discharge of the strip mine is not affected. When the inner row is close to the subsection step 102a, strippers which are easy to glue when meeting water in the strip mine begin to be discharged, so that an artificial water-resisting layer 104 is formed, the artificial water-resisting layer 104 is connected with the original shallow water-resisting layers 102 of the end walls at two sides, a continuous water-resisting layer is formed inside the inner dumping ground, the artificial water-resisting layer 104 adopts a layered discharge mode, and after discharge, mine equipment is adopted for repeatedly rolling and manually promoting the gluing of the artificial water-resisting layer 104. The artificial water-resisting layer 104 is in a continuous up-and-down shape in the connecting line direction of the end walls at the two sides, the connecting position of the original shallow water-resisting layer 102 is a peak bottom, peaks and valleys at the peak bottom alternately appear, the inclination angle between the peaks and valleys at the peak bottom is 15-20 degrees, the running of a mining truck can be met, and the length of a single-side inclined slope is 150-200 m. The thickness of the artificial water-resisting layer 104 is 2-3m thicker than that of the original shallow water-resisting layer 102, and the peak-valley elevation of the artificial water-resisting layer is 2-3m lower than that of the upper surface of the original shallow water-resisting layer 102. Preferably, the thickness of each layer of the artificial water-resisting layer 102 is 3-5 m.
And constructing a pervious concrete pipe in the center of each artificial water-resisting layer peak valley to form a water taking well 306, wherein a perforated steel ring 306b with the height of 30-50 cm is padded at the bottom of the pervious concrete pipe, and the thickness of the pervious concrete pipe 306c is 3-5 cm when the thickness of the perforated steel ring 306b is super-thick. The pervious concrete pipe 306c has a thickness of 10-15cm, a height of 2m and an inner diameter of 1.5 m. A concrete base is constructed under the steel ring with holes 306b to prevent settlement. Further, in order to reduce the influence on the normal production efficiency of the strip mine in the arrangement process of the water intake wells 306, at most 2 water intake wells 306 are arranged in the same peak valley in each underground water migration channel.
Hydrophobic rock blocks with the block size of 7-12 cm are discarded on the artificial water barrier 104, the hydrophobic rock blocks do not disintegrate when meeting water, an underground water migration channel 201 is formed, and the method of directly dumping trucks is used for discarding, so that excessive rolling is avoided. And when the upper surface of the underground water migration channel 201 exceeds the upper surface of the original aquifer 103 by 2-3m, stopping the operation. During the construction of the underground water transfer passage 201, the water intake well 306 is raised. Taking each water taking well 306 as a center, dumping the hydrophobic rock blocks around the water taking well 306 in an inclined mode, wherein the water taking well 306 is located at the lowest point, the highest point is vertically above the peak of the artificial water-resisting layer 104, and the difference is 20 m.
And (3) removing strippers which are easy to be cemented when meeting water from the hydrophobic rock blocks in a layered mode to form a top water-resisting layer 202 with the thickness of 5 m. The top layer water-resisting layer 202 is connected with the open pit mine end slope, the open pit mine end slope at the connecting position is built into a step shape of about 2m, and the contact surface with the top layer water-resisting layer is increased. The top water-resisting layer 202 is not constructed within the range of 20m around the water taking well 306, and the hydrophobic rock blocks are discarded to form the leakage holes 202 a.
And constructing a filter layer 300 on the top waterproof layer 202, wherein the upper surface of the filter layer 300 is flush with the upper surface corresponding to the final design height of the soil discharge field in the strip mine. The filter layers 300 are 5 layers in total, and are sequentially a first filter layer, a second filter layer, a third filter layer, a fourth filter layer and a fifth filter layer from top to bottom. First filter layer 301 is medium-sized particle gravel rock class material to 0.5 ~ 2cm material is given first place to, adorns in the plastic case that permeates water, can wholly change, mainly intercepts debris such as the plant debris in the aquatic and reduces the turbidity of water. The second filter layer 302 is mainly medium-fine sand, intercepts silt in water, reduces turbidity, and can be replaced regularly as required. The third filter layer 303 is made of materials such as permeable bricks or permeable cement; fourth filter layer 304 is the same material as second filter layer 302 and fifth filter layer 305 is the same material as first filter layer 301. The permeable cloth is laid under the fifth filter layer 305, and the fourth filter layer 304, the fifth filter layer 305 and the permeable cloth 203 mainly prevent small particle materials from being mixed into the groundwater migration channel 201 to cause blockage. And simultaneously heightening the water taking pipe to the ground surface. Further, preferably, the thicknesses of the first, second, third, fourth and fifth filtering layers are 2-3m, 3-5 m, 0.5-1.0 m, 2-3m and 2-3m respectively. During actual construction, the thickness of each layer of filter layer should be reduced or enlarged proportionally to the actual height of filter layer 300 available for construction.
With the continuous propulsion of a soil discharge field in the strip mine, the underground water migration channel 201 is continuously widened in the horizontal plane along the propulsion direction of the strip mine, when the width reaches 150-200m, a vertical water-stop wall 400 is vertically constructed from the upper surface of the artificial water-stop layer 104 to the upper surface, the thickness of the vertical water-stop wall is 15-20 m, the upper boundary is connected with the top-layer water-stop layer 202, the underground water migration channel 201 is closed, and an independent closed underground water migration channel is formed.
Along with the production of strip mines, a continuous multi-section closed underground water migration channel is constructed in an inner dumping yard. A method for taking and recovering shallow groundwater of an internal drainage strip mine comprises the following steps of simultaneously taking groundwater, and specifically comprises the following steps:
s1: stopping the drainage and drainage operation around the soil discharge field in the strip mine and recovering the migration of shallow groundwater.
S2: when the shallow groundwater passes through the groundwater migration channel, the shallow groundwater is collected in the water taking well, and a water pumping facility is installed in the water taking well to realize water taking.
S3: and monitoring equipment is arranged in the water taking well simultaneously, and the water taking well is used as an observation well to monitor the underground water condition.
S4: when one sealed underground water migration channel is broken or fails, the water pumping force of the water taking well of which the sealed underground water migration channel is close to the original shallow water-resisting layers on the two sides is increased, so that underground water is ensured not to pass through the sealed underground water migration channel any more, and the underground water is prevented from permeating into the interior of the refuse dump.
A method for taking and recovering shallow groundwater of an internally-discharged strip mine simultaneously comprises groundwater replenishment, and specifically comprises the following steps:
s1: and arranging a water delivery channel in the strip mine area, wherein the terminal point of the water delivery channel is positioned on the surface of the filter layer.
S2: when water resources in a mining area are rich or rainfall in the mining area, water is directly discharged or drained to a filtering area, and water body passes through the water permeable cloth and enters the underground water migration channel after being filtered by the filtering layer, so that water is supplemented to underground water.
The rest of the structure is the same as that of embodiment 1.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (10)
1. The utility model provides a device is taken to interior row strip mine shallow groundwater which characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
the base layer (100) comprises an open pit end slope (101), a water-resisting layer (102) arranged in the open pit end slope (101), a water-containing layer (103) arranged above the water-resisting layer (102), and an artificial water-resisting layer (104) arranged between the water-resisting layer (102) and the water-containing layer (103);
the migration layer (200) is arranged above the base layer (100) and comprises a migration channel (201) arranged above the artificial water-resisting layer (104) and a top water-resisting layer (202) arranged in the migration channel (201); and the number of the first and second groups,
the filter layer (300) is arranged above the migration layer (200) and sequentially comprises a first filter layer (301), a second filter layer (302), a third filter layer (303), a fourth filter layer (304), a fifth filter layer (305) and a water taking well (306) penetrating through the filter layer (300) and the migration layer (200) from top to bottom.
2. The device for taking shallow groundwater of an internal drainage strip mine according to claim 1, wherein: a segmented step (102a) is arranged between the water-resisting layer (102) and the artificial water-resisting layer (104).
3. The device for taking shallow groundwater of an internal drainage strip mine according to claim 2, wherein: the top layer water-resisting layers (202) are arranged at intervals, leakage holes (202a) are formed between the top layer water-resisting layers (202) at intervals, and permeable cloth (203) is further arranged in the migration layer (200).
4. The device for taking shallow groundwater of an internal drainage strip mine according to claim 3, wherein: the water taking well (306) comprises a concrete foundation (306a), a perforated steel ring (306b) and a concrete pipe (306c), wherein the perforated steel ring (306b) is arranged above the concrete foundation (306 a).
5. The device for taking shallow groundwater of an internal drainage strip mine according to claim 4, wherein: and a vertical water-stop wall (400) is also arranged between the shallow groundwater taking devices of the inner-drainage strip mine.
6. The underground water taking and recovering method by adopting the internal-drainage strip mine shallow underground water taking device as claimed in claims 1-5 is characterized in that: when the strip mine is internally discharged, strip mine strippers are discharged from the space below the sectional step (102a), when the internal discharge is close to the sectional step (102a), strippers which are easy to glue when meeting water in the strip mine are discharged, the artificial water-resisting layer (104) is connected with the two side end slope water-resisting layers (102), and a continuous water-resisting layer is formed inside the internal dumping ground.
7. The device and the method for taking and recovering the shallow groundwater of the internal-drainage strip mine according to claim 6, wherein: and (3) beginning to discharge hydrophobic rock blocks on the artificial water-resisting layer (104) to form the migration channel (201), and stopping operation when the upper surface of the migration channel (201) exceeds the upper surface of the original water-containing layer by 2-3 m.
8. The device and the method for taking and recovering the shallow groundwater of the internal-drainage strip mine according to claim 7, wherein: constructing a filter layer (300) on the top waterproof layer (202), wherein the upper surface of the filter layer (300) is flush with the upper surface corresponding to the final design height of the earth discharge field in the strip mine, and the first filter layer (301) intercepts sundries such as plant debris in the incoming water and reduces the turbidity of the water; the second filter layer (302) intercepts silt in water and reduces turbidity; the third filter layer (302) is made of materials such as permeable bricks or permeable cement; the fourth filter layer (304) is of the same material as the second filter layer (302), and the fifth filter layer (305) is of the same material as the first filter layer (301); and a permeable cloth is laid under the fifth filter layer (305), and the fourth filter layer (304), the fifth filter layer (305) and the permeable cloth (203) prevent small particle materials from being mixed into the underground water migration channel (201) to cause blockage.
9. The device and the method for taking and recovering the shallow groundwater of the internal-drainage strip mine according to claim 8, wherein: the migration channel (201) is continuously widened in the horizontal plane along the advancing direction of the open pit, when the width reaches 150-200m, the vertical water-stop wall (400) is vertically constructed from the upper surface of the artificial water-stop layer (104) upwards, the upper boundary of the vertical water-stop wall (400) is connected with the top-layer water-stop layer (202), the migration channel (201) is closed, and an independent closed underground water migration channel (201) is formed.
10. The device and the method for taking and recovering the shallow groundwater of the internal-drainage strip mine according to claim 9, wherein: the groundwater taking step comprises:
(1) stopping the drainage and drainage operation around the soil discharge field in the strip mine, and recovering the migration of shallow groundwater;
(2) when the shallow groundwater passes through the migration channel (201), the shallow groundwater is collected in a water taking well (306), and a water pumping facility is installed in the water taking well to realize water taking;
(3) monitoring equipment is arranged in the water taking well (306) at the same time, and the monitoring equipment is also used as an observation well for monitoring the underground water condition;
(4) when one sealed underground water migration channel (201) is broken or fails, increasing the water pumping force of the water intake well (306) of the sealed underground water migration channel (201) close to the original shallow water-resisting layers (102) at two sides, ensuring that the underground water does not pass through the underground water migration channel (201) any more, and avoiding the underground water from permeating into the interior of the refuse dump;
the groundwater replenishing step comprises:
(1) arranging a water delivery channel in the strip mine area, wherein the terminal point of the water delivery channel is positioned on the surface of the filter layer (300);
(2) when water resources in a mining area are rich or rainfall in the mining area, water is directly discharged or drained to the filter layer (300), and water passes through the filter layer (300) and is filtered and then passes through the water permeable cloth (203) to enter the underground water migration channel (201) so as to supplement water to underground water.
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