CN114934496A - Single-well underground water monitoring method and system - Google Patents
Single-well underground water monitoring method and system Download PDFInfo
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- CN114934496A CN114934496A CN202210782416.8A CN202210782416A CN114934496A CN 114934496 A CN114934496 A CN 114934496A CN 202210782416 A CN202210782416 A CN 202210782416A CN 114934496 A CN114934496 A CN 114934496A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 138
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 97
- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000005553 drilling Methods 0.000 claims abstract description 50
- 239000003673 groundwater Substances 0.000 claims abstract description 50
- 239000000523 sample Substances 0.000 claims abstract description 27
- 238000001514 detection method Methods 0.000 claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- 239000002689 soil Substances 0.000 claims abstract description 4
- 239000000440 bentonite Substances 0.000 claims description 18
- 229910000278 bentonite Inorganic materials 0.000 claims description 18
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 17
- 239000004576 sand Substances 0.000 claims description 16
- 238000010276 construction Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 10
- 238000005406 washing Methods 0.000 claims description 10
- 239000004568 cement Substances 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 8
- 230000000149 penetrating effect Effects 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 230000002572 peristaltic effect Effects 0.000 claims description 3
- 239000008398 formation water Substances 0.000 claims description 2
- 239000011148 porous material Substances 0.000 description 5
- 238000007789 sealing Methods 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010291 electrical method Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010813 municipal solid waste Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000009527 percussion Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000003403 water pollutant Substances 0.000 description 1
- 239000002349 well water Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D1/00—Investigation of foundation soil in situ
- E02D1/02—Investigation of foundation soil in situ before construction work
- E02D1/06—Sampling of ground water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D1/00—Investigation of foundation soil in situ
- E02D1/02—Investigation of foundation soil in situ before construction work
- E02D1/022—Investigation of foundation soil in situ before construction work by investigating mechanical properties of the soil
- E02D1/025—Investigation of foundation soil in situ before construction work by investigating mechanical properties of the soil combined with sampling
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B6/00—Drives for drilling with combined rotary and percussive action
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V9/00—Prospecting or detecting by methods not provided for in groups G01V1/00 - G01V8/00
- G01V9/007—Prospecting or detecting by methods not provided for in groups G01V1/00 - G01V8/00 by detecting gases or particles representative of underground layers at or near the surface
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V9/00—Prospecting or detecting by methods not provided for in groups G01V1/00 - G01V8/00
- G01V9/02—Determining existence or flow of underground water
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- 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 relates to a single-well underground water monitoring method and a single-well underground water monitoring system, wherein the method comprises the following steps of S1, surveying a stratum structure and determining the position of a water-bearing stratum, completing well drilling and soil core acquisition by adopting geological drilling equipment, and accurately surveying the stratum structure and the position of the water-bearing stratum by combining a high-precision geological detection instrument; s2, constructing a single underground water monitoring well, selecting a well pipe, manufacturing a sieve pipe, placing the well pipe at a specified position in a wellhead, and filling gravel and plugging different positions of the well pipe; and S3, monitoring the flow velocity and the flow direction of the groundwater in the single monitoring well in real time, placing a probe of the flow velocity and flow direction instrument in the position range of the groundwater aquifer of the monitoring well, monitoring the flow velocity and the flow direction of the groundwater in the monitoring well, and fitting the information data of the flow velocity and the flow direction of the groundwater and outputting results. According to the invention, accurate monitoring of the flow velocity and the flow direction of underground water in the well can be realized by constructing a single well.
Description
Technical Field
The invention relates to the field of environmental monitoring, in particular to a single-well underground water monitoring method and system.
Background
How to accurately judge the groundwater flow direction in the treatment area in the monitoring and treatment process determines the representativeness of the groundwater sample collection, and has great influence on the groundwater treatment effect. At present, the flow direction of underground water in a treatment area is mainly determined by arranging a plurality of underground water monitoring wells in the area and judging the flow direction of the water level of the underground water through underground water level differences in different monitoring wells.
However, in the current monitoring mode, because the monitoring well is in the drilling and pore-forming process in the well-building and drilling process, the drilling tool is often cooled by using circulating water, bentonite is generally added to form slurry, the slurry can be used for taking out broken slag in a hole, and meanwhile, the bentonite slurry can play a better sealing effect on the wall of the hole to prevent circulating water from seeping out of the hole. However, after the monitoring well is constructed, the groundwater level cannot be normally recovered due to plugging of bentonite slurry on the hole wall of the well hole, so that accurate judgment of the groundwater level is influenced.
In addition, the underground water level difference in the underground water monitoring or treating area is not large, and the ground surface height of the site is also different, so that the underground water level difference in the site cannot be accurately judged, and the flow direction of the underground water cannot be accurately judged; underground water in the ground belongs to different water areas, and the flow direction of the underground water cannot be accurately judged through hydrology of the different water areas.
Disclosure of Invention
In order to solve the problems, the invention provides a single-well underground water monitoring method and a single-well underground water monitoring system, which are used for solving the problems of inaccurate judgment of underground water level and underground water flow direction, high cost and environmental friendliness of construction of a plurality of monitoring wells in the prior art.
The invention relates to a single-well underground water monitoring method, which comprises the following steps:
s1, surveying a stratum structure and determining the position of a water-bearing stratum, completing well drilling and soil core acquisition by adopting geological drilling equipment, and accurately surveying the stratum structure and the position of the water-bearing stratum by combining a high-precision geological detection instrument;
s2, constructing a single underground water monitoring well, selecting a well pipe, manufacturing a sieve pipe, placing the well pipe at a specified position in a wellhead, and filling gravel and plugging different positions of the well pipe;
and S3, monitoring the flow velocity and the flow direction of the groundwater in the single monitoring well in real time, placing a probe of the flow velocity and flow direction instrument in the position range of the groundwater aquifer of the monitoring well, monitoring the flow velocity and the flow direction of the groundwater in the monitoring well, and fitting the information data of the flow velocity and the flow direction of the groundwater and outputting results.
Further, in the step S1, the position of the underground water monitoring well distribution point is confirmed according to the relevant hydrogeological data and the actual underground water monitoring requirement, the drilling exploration construction area is leveled and cleaned, and the drilling points of the professional drilling equipment are reasonably arranged.
Further, in step S1, a rotary drilling method or an impact drilling method is selected according to different formation conditions, drilling with a predetermined caliber and depth is performed, and the formation and groundwater aquifer structure is analyzed and recorded by the collected core.
Further, in step S1, a ground penetrating radar or a high density electrical prospecting apparatus is used to detect the ground structure of the field in the well-building area of the monitoring well, and the position of the water-containing layer in the groundwater in the field is accurately determined by combining the drilling data.
Further, in step S2, a PVC pipe meeting the size specification is selected according to the drilling aperture of the monitoring well, the length of the pipe is cut according to the depth of the well, a sieve tube is manufactured at a corresponding position of the well pipe corresponding to the aquifer of the monitoring well according to the position of the aquifer of the underground water, a sieve mesh with a specified size is manufactured, and the sieve tube is filtered and wrapped by a fine sieve.
Further, in step S2, the well pipe is placed at a predetermined position in the wellhead, gravel packing and plugging are performed on different positions of the well pipe with bentonite balls 3, coarse sand 4, gravel 5, and cement materials, the part below the well pipe screen is packed with bentonite balls 3, the part near the bottom screen is packed with coarse sand 4, the part near the screen is packed with gravel 5, the part near the top screen is packed with coarse sand 4, the part from the screen to the ground is packed with bentonite balls, and the wellhead is subjected to cement water sealing and well platform 7 construction.
Further, in the step S2, the monitoring well is washed 48 hours after the well is built, a peristaltic pump or a belleville tube pump is used for washing the well, and groundwater of the monitoring well with a volume of 3-5 needs to be extracted in the well completion and well washing process.
Further, in the step S3, after the well is completed and washed, the underground water in the monitoring well is kept still for more than 48 hours, and the sensor at the bottom of the probe 6 of the flow velocity and direction instrument is placed in the position range of the underground water aquifer of the monitoring well.
Further, in step S3, the probe 6 of the flow velocity/direction instrument is left standing for more than 15min, and the number of the water quality particle capture points and the particle size parameters are set.
The invention also provides a single-well underground water monitoring system which is used for the single-well underground water monitoring method and comprises an exploration assembly, a single monitoring well assembly and a real-time monitoring assembly, wherein the exploration assembly comprises geological drilling equipment and geological detection equipment, the exploration assembly inspects the site to determine the position of an underground water aquifer, the single monitoring well assembly comprises a well pipe and a screen pipe, the real-time monitoring assembly comprises a flow velocity and direction instrument probe and a flow velocity and direction instrument control terminal, and the flow velocity and direction instrument probe is arranged in the single monitoring well assembly.
The invention realizes the accurate real-time monitoring of the flow velocity and the flow direction of the underground water, can realize the accurate monitoring of the flow direction of the underground water in the well only by building a single well, can also synchronously and accurately provide the flow velocity information of the underground water, effectively controls the well building quantity and greatly reduces the well building cost of the underground water monitoring well.
The method solves the problem that the flow direction and the flow speed of the underground water are difficult to determine in the underground water monitoring and treating process, provides more reliable repairing range information for underground water repairing and treating, and can effectively predict the diffusion trend of underground water pollutants.
The invention carries out investigation on the stratum structure, determines the position of the groundwater aquifer, monitors the flow velocity and the flow direction of the groundwater by the probe of the flow velocity and flow direction instrument, and enters the groundwater aquifer for real-time monitoring of the flow velocity and the flow direction of the groundwater in sequence through three processes of accurate investigation of site geology, construction of the groundwater monitoring well and real-time monitoring of the flow velocity and the flow direction of the groundwater, thereby realizing real-time and accurate dynamic monitoring of the flow velocity and the flow direction of the groundwater.
According to the invention, the bentonite balls 3, the coarse sand 4, the gravel 5 and the cement material are used for filling and plugging different positions of the well pipe, the part below the well pipe sieve tube is filled with the bentonite balls 3, the part near the sieve tube at the bottom is filled with the coarse sand 4, the part near the sieve tube at the sieve tube is filled with the gravel 5, the part near the sieve tube at the top is filled with the coarse sand 4, and the part from the sieve tube to the ground is filled with the bentonite balls.
The single-well underground water monitoring system is widely applicable to underground water monitoring in various fields such as industrial site environment treatment, mine environment treatment, farmland treatment, domestic garbage landfill, industrial solid waste landfill and the like, can provide accurate and reliable underground water flow speed and direction information, greatly promotes the efficiency of underground water monitoring, and provides more reliable basic data support for site environment treatment and restoration.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a flow chart of a single well groundwater monitoring method provided by the present invention;
FIG. 2 is a schematic view of a single well groundwater monitoring system according to the present invention;
FIG. 3 is a flow velocity and direction monitoring result diagram of a single well groundwater monitoring method provided by the invention.
Description of reference numerals:
1-a well pipe; 2-a sieve tube; 3-bentonite spheres; 4-coarse sand; 5-gravel; 6-flow velocity and direction instrument probe; 7-monitoring a well platform; 8-flow rate to instrument control terminal.
Detailed description of the invention
In order to make those skilled in the art better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Referring to fig. 1-3, the present invention provides a single well groundwater monitoring method, the method comprising:
s1, surveying a stratum structure and determining the position of a water-bearing stratum, completing well drilling and soil core acquisition by adopting geological drilling equipment, and accurately surveying the stratum structure and the position of the water-bearing stratum by combining a high-precision geological detection instrument;
s2, constructing a single underground water monitoring well, selecting a well pipe, manufacturing a sieve pipe, placing the well pipe at a specified position in a wellhead, and filling gravel and plugging different positions of the well pipe;
and S3, monitoring the flow velocity and the flow direction of the groundwater in the single monitoring well in real time, placing a probe of the flow velocity and flow direction instrument in the position range of the groundwater aquifer of the monitoring well, monitoring the flow velocity and the flow direction of the groundwater in the monitoring well, and fitting the information data of the flow velocity and the flow direction of the groundwater and outputting results.
In step S1, confirming the distribution point position of the underground water monitoring well according to the relevant hydrogeological data and the actual underground water monitoring requirement, leveling and cleaning the drilling exploration construction area, and reasonably arranging the drilling point positions of the professional drilling equipment; selecting a rotary or impact drilling mode according to different stratum conditions, drilling with specified caliber and depth, and analyzing and recording the stratum and the groundwater aquifer structure through the collected rock core; and (3) detecting the ground stratum structure in the field area of the monitoring well building area by using ground penetrating radar or high-density electrical prospecting equipment, and accurately determining the position of the underground water-containing layer in the field area by combining drilling data.
In step S2, a PVC pipe meeting the size specification is selected according to the drilling aperture of the monitoring well, the length of the pipe is cut according to the depth of the well, a sieve tube is manufactured at a corresponding position of a well pipe corresponding to the aquifer of the monitoring well according to the position of the aquifer of the underground water, a sieve mesh with a specified size is manufactured, and the sieve tube is wrapped by a fine sieve.
The well pipe is placed at a specified position in a well head, bentonite balls 3, coarse sand 4, gravel 5 and cement materials are used for filling gravel and plugging different positions of the well pipe, the part below a well pipe sieve pipe is filled with the bentonite balls 3, the part close to the sieve pipe at the bottom is filled with the coarse sand 4, the part close to the sieve pipe at the sieve pipe is filled with the gravel 5, the part close to the sieve pipe at the top is filled with the coarse sand 4, the part from the sieve pipe to the ground is filled with the bentonite balls, and the well head is used for cement water stopping and well platform 7 construction.
And (3) washing the monitoring well 48 hours after the well is built, washing the well by adopting a peristaltic pump or a Beller tube pump, and pumping underground water of the monitoring well with the volume of 3-5 in the well completion and well washing process.
In the step S3, after the well is formed and washed, the underground water in the monitoring well stands for more than 48 hours, and the sensor at the bottom of the probe 6 of the flow velocity and direction instrument is placed in the position range of the underground water aquifer of the monitoring well; standing the probe 6 of the flow velocity and flow direction instrument for more than 15min, and setting the number of the water quality particle capture points and the particle size parameters.
According to the steps of the invention, geological drilling and underground water well construction are carried out in a certain northern place, the flow velocity and the flow direction of underground water are accurately monitored according to the steps of the invention, the underground water flow is 43.44 degrees to the north east, the average flow velocity of the underground water is 397.14um/s, the monitoring data result is shown in figure 3, and the monitoring result provides accurate data support and reliable guarantee for underground water monitoring and treatment in the place.
The invention also provides a single-well underground water monitoring system which is used for the single-well underground water monitoring method and comprises a surveying component, a single monitoring well component and a real-time monitoring component, wherein the surveying component comprises geological drilling equipment and geological detection equipment, the surveying component determines the position of an underground water aquifer for site surveying, the single monitoring well component comprises a well casing 1 and a sieve casing 2, the real-time monitoring component comprises a flow velocity and direction instrument probe 6 and a flow velocity and direction instrument control terminal 8, and the flow velocity and direction instrument probe 6 is arranged in the single monitoring well component 8.
Preferably, the geological drilling equipment is a rotary drilling machine, and the bore diameter of the drilling machine is phi 80 mm-phi 300 mm; or the geological drilling equipment is a percussion drill, and the hole diameter of the drilling hole is phi 60 mm-phi 200 mm.
Preferably, the geological detection equipment is a ground penetrating radar or a high density electrical method instrument.
Preferably, the screen pipe is arranged on the well pipe corresponding to the stratum structure where the monitoring well is located and the position of the aquifer, and filling materials are arranged among the well pipe, the screen pipe and the stratum.
Preferably, the well pipe is a PVC pipe with the diameter size of phi 110-phi 180mm, and the height of the well pipe is 0.2-0.4m higher than the ground level. The length of the sieve tube is slightly less than the thickness of the underground water-containing layer, the sieve tube is formed by processing sieve holes through drilling or slotting the well pipe, and the sieve mesh is bound outside the sieve holes. The hole diameter of the drill hole of the well pipe is not more than 5mm, the hole distance is 10-20mm, or the seam width size of the cutting seam of the well pipe is 0.2-0.5 mm.
Preferably, the filling material is bentonite balls and/or coarse sand and/or gravel, and water-stop well-sealing cement and a monitoring well platform are arranged at the top of the single monitoring well assembly.
Preferably, the probe of the flow velocity and flow direction instrument is arranged at the position of the underground water aquifer and the sieve tube, and the sensor at the lower part of the probe of the flow velocity and flow direction instrument is arranged in the range of the aquifer. The flow velocity and direction instrument control terminal is arranged on the earth surface and is electrically connected with the flow velocity and direction instrument probe.
In the geological accurate exploration process, the geological drilling and high-precision geological detection means are combined to carry out accurate exploration on the ground stratum structure, and the position of the underground water-bearing stratum is accurately judged. Drilling a field exploration point position and collecting a core sample by adopting rotary or impact type professional drilling equipment according to geological conditions in the geological drilling process, wherein the size of a formed monitoring well hole is phi 110 mm-phi 200mm, and stratum structure information is recorded; and (3) surveying the stratum structure by adopting high-precision instruments such as ground penetrating radar equipment or a high-density electrical method instrument and the like, and accurately judging the position of the underground water-bearing stratum by combining the drilling survey result.
In the process of constructing the underground water monitoring well, the processes of well pipe selection, screen pipe manufacturing, gravel material filling for the well construction of the monitoring well, well completion and well washing of the monitoring well and the like are successively completed. Selecting a PVC well pipe 1 with a proper length according to the hole-forming aperture and the well-forming depth of exploration drilling, wherein the diameter size is phi 75 mm-phi 160mm, and the well pipe 1 is preferably 0.2-0.4m higher than the ground level; manufacturing a sieve tube 2 on the corresponding position of a well tube 1 according to the stratum structure and the aquifer position of a monitoring well, wherein the length of the sieve tube 2 is slightly smaller than the thickness of the aquifer of underground water, generally adopting an electric drill and a slotting method to process sieve pores on the sieve tube part of the well tube 1, wherein the pore diameter is not more than 5mm and the pore spacing is 10-20mm during drilling, the slot width is 0.2-0.5mm during slotting, and binding a sieve mesh outside the sieve pores of the processed sieve tube 2 to prevent silt from blocking the pores; the gravel filling process of the monitoring well needs to adopt materials such as bentonite balls 3, coarse sand 4, gravel 5 and the like, the coarse sand 4 and the gravel 5 need to be washed, and the cement water stop well sealing and the building of a well platform 7 are carried out on the built monitoring well; and (4) performing well completion and well washing after well construction is completed, wherein 3-5 volumes of underground water of the monitoring well are usually required to be extracted in the well washing process.
In the process of monitoring the flowing speed and the flowing direction of the groundwater, the flows of accurately placing the position of a probe of a flow speed and flow direction instrument, setting monitoring parameters, outputting monitoring data and the like are required to be completed. Accurately lowering the groundwater flow speed and flowing to a probe 6 of real-time monitoring equipment according to the positions of a groundwater aquifer and a sieve tube 2, and enabling a sensor at the lower part of the probe 6 to be arranged in the range of the aquifer; the underground water in the monitoring well can be monitored for more than 48 hours after the well is washed, the instrument probe 6 needs to stand for at least 15min at the aquifer position before monitoring, and monitoring setting parameters such as the number of particle capture points, the particle size and the like are adjusted; and monitoring the flow rate of the underground water, and performing flow rate and flow direction data fitting and result output after the flow rate and flow direction data fitting is completed.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A single well groundwater monitoring method, the method comprising:
s1, surveying a stratum structure and determining the position of a water-bearing stratum, completing well drilling and soil core acquisition by adopting geological drilling equipment, and accurately surveying the stratum structure and the position of the water-bearing stratum by combining a high-precision geological detection instrument;
s2, constructing a single underground water monitoring well, selecting a well pipe, manufacturing a sieve pipe, placing the well pipe at a specified position in a wellhead, and filling gravel and plugging different positions of the well pipe;
and S3, monitoring the flow velocity and the flow direction of the groundwater in the single monitoring well in real time, placing a probe of the flow velocity and flow direction instrument in the position range of the groundwater aquifer of the monitoring well, monitoring the flow velocity and the flow direction of the groundwater in the monitoring well, and fitting the flow velocity and flow direction information data of the groundwater and outputting results.
2. The single-well underground water monitoring method according to claim 1, wherein in step S1, the underground water monitoring well placement positions are confirmed according to the relevant hydrogeological data and the actual underground water monitoring requirements, the drilling exploration construction area is leveled and cleaned, and the drilling sites of the professional drilling equipment are reasonably arranged.
3. A single-well groundwater monitoring method according to claim 2, wherein in step S1, rotary or impact drilling is selected according to different formation conditions, drilling with specified caliber and depth is performed, and the formation and groundwater aquifer structure are analyzed and recorded by the collected core.
4. The single-well groundwater monitoring method according to claim 3, wherein in the step S1, the ground structure in the ground in the well building area of the monitoring well is detected by using a ground penetrating radar or a high-density electrical prospecting apparatus, and the position of the groundwater aquifer in the ground area is accurately determined by combining the drilling data.
5. A single-well groundwater monitoring method according to claim 1, wherein in step S2, a PVC pipe meeting the size specification is selected according to the drilling aperture of the monitoring well, the length of the pipe is cut according to the depth of the well, a sieve tube is manufactured at the corresponding position of the well pipe corresponding to the aquifer of the monitoring well according to the position of the aquifer of the groundwater, a sieve mesh with a specified size is manufactured, and the sieve tube is wrapped by a fine sieve.
6. A single well groundwater monitoring method as claimed in claim 5, wherein in step S2, the well pipe is placed at a predetermined position in the wellhead, the well pipe is gravel packed and plugged at different positions with bentonite balls 3, coarse sand 4, gravel 5 and cement material, the part below the well screen is packed with bentonite balls 3, the part near the bottom of the screen pipe is packed with coarse sand 4, the part near the screen pipe is packed with gravel 5, the part near the top of the screen pipe is packed with coarse sand 4, the part near the surface of the screen pipe is packed with bentonite balls, and the wellhead is cement-sealed and the well platform 7 is constructed.
7. A single-well underground water monitoring method according to claim 6, wherein in step S2, the monitoring well is washed 48h after the well is built, a peristaltic pump or a Beller tube pump is used for washing the well, and 3-5 volumes of underground water of the monitoring well need to be extracted in the well completion and well washing process.
8. A single-well groundwater monitoring method according to claim 1, wherein in the step S3, after the well is washed, the groundwater in the monitoring well is left standing for more than 48h, and the sensor at the bottom of the probe 6 of the current direction instrument is placed in the position range of the groundwater aquifer of the monitoring well.
9. A single-well underground water monitoring method according to claim 8, wherein in step S3, the flow velocity and direction instrument probe 6 is left standing for at least 15min to set the number of water quality particle capture points and particle size parameters.
10. A single-well underground water monitoring system used for the single-well underground water monitoring method as claimed in any one of claims 1 to 9, which is characterized by comprising an exploration assembly, a single monitoring well assembly and a real-time monitoring assembly, wherein the exploration assembly comprises geological drilling equipment and geological detection equipment, the exploration assembly is used for surveying and determining the position of an underground water aquifer for a site, the single monitoring well assembly comprises a well pipe and a screen pipe, the real-time monitoring assembly comprises a flow velocity and flow direction instrument probe and a flow velocity and flow direction instrument control terminal, and the flow velocity and flow direction instrument probe is arranged in the single monitoring well assembly.
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