CN111705848A - Arrangement method of tracking monitoring wells of landfill seepage-proofing system - Google Patents
Arrangement method of tracking monitoring wells of landfill seepage-proofing system Download PDFInfo
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- CN111705848A CN111705848A CN202010379874.8A CN202010379874A CN111705848A CN 111705848 A CN111705848 A CN 111705848A CN 202010379874 A CN202010379874 A CN 202010379874A CN 111705848 A CN111705848 A CN 111705848A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 165
- 238000000034 method Methods 0.000 title claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000005553 drilling Methods 0.000 claims abstract description 15
- 239000004576 sand Substances 0.000 claims abstract description 11
- 239000002352 surface water Substances 0.000 claims abstract description 11
- 239000004575 stone Substances 0.000 claims abstract description 5
- 230000001154 acute effect Effects 0.000 claims description 6
- 239000010410 layer Substances 0.000 description 59
- 239000002689 soil Substances 0.000 description 20
- 238000001514 detection method Methods 0.000 description 15
- 239000007788 liquid Substances 0.000 description 15
- 239000002699 waste material Substances 0.000 description 8
- 239000003673 groundwater Substances 0.000 description 7
- 238000001914 filtration Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000010790 dilution Methods 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000000243 solution 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
- E02D33/00—Testing foundations or foundation structures
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/002—Ground foundation measures for protecting the soil or subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/006—Sealing of existing landfills, e.g. using mining techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
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Abstract
The invention discloses an arrangement method of tracking monitoring wells of an anti-seepage system of a landfill, which comprises the steps of drilling monitoring well bores and burying monitoring wells; drilling two monitoring well holes staggered in an X shape outside the profile of the landfill until the sum of the wrap angles of the well holes to the landfill is larger than 300 degrees; sleeving a section of cylindrical silk screen on a section of guide pipe; concentrically inserting a section of inner pipe into the conduit, wherein the surface of the inner pipe is provided with an overflowing hole; putting the cylindrical wire mesh, the guide pipe and the inner pipe into a well hole of a monitoring well together; cobblestones are poured into the well hole of the monitoring well and the outside of the silk screen from the ground surface to form an annular outer layer filling layer, and the lowest part of the annular air bag is lower than the lowest water level of local surface water by more than 1 meter; pouring sand and stone into the conduit pipe and the inner pipe from the ground surface to form an inner-layer filling layer; implanting a plurality of leak sensors along the axis of the inner tube; the inner tube is filled with a water-absorbing layer. The invention can improve the monitoring coverage of the monitoring wells, and obtain complete leakage monitoring by fewer monitoring wells.
Description
Technical Field
The invention relates to the field of an anti-seepage leakage detection method for a refuse landfill, in particular to an arrangement method for a tracking monitoring well of an anti-seepage system of a refuse landfill.
Background
In social production, the yield of garbage is higher and higher, in a garbage treatment method, landfill accounts for a large proportion, and secondary pollution caused by leakage of a garbage landfill site endangers surrounding soil and underground water. In the garbage category, there are dangerous waste wastes that require strict control of their pollution, otherwise they can cause great harm to the environment and people.
Waste liquid is often generated after the garbage is buried, the waste liquid leaks into soil after passing through an impermeable layer to generate great harm, so that the impermeable detection is needed, the detection means comprises a fluorescent tracing method, a temperature tracing method and the like, monitoring wells are arranged around a landfill site in a matching mode to detect the leakage condition, and the leakage liquid is detected by a leakage liquid sensor after reaching the monitoring wells and gives a signal to the outside.
In the prior art, the monitoring well generally moves the conventional groundwater monitoring well structure, and a section of vertical well is detected after the liquid in the surrounding soil flows into the well, and the setting mode has several problems: 1. the coverage range in the horizontal direction is small, one monitoring well can only monitor a small area nearby, and a plurality of monitoring wells are required to be arranged for the completeness of monitoring; 2. the leakage position is inconvenient to determine, and needs to be obtained through an auxiliary leakage detection means, or complete and comprehensive manual inspection of a landfill site is performed after leakage occurs; 3. surface water can flow into the monitoring well from surface soil and affect the monitoring structure.
Disclosure of Invention
The invention aims to provide a tracking monitoring well of a landfill seepage-proofing system and an arrangement method thereof, so as to solve the problems in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
landfill seepage prevention system trails monitoring well and at landfill outer circumference equipartition a plurality of groups, including two crisscross monitoring wells of X-shaped in every monitoring well, the monitoring well includes outer filling layer, the silk screen, the pipe, the inlayer filling layer, the inner tube, the layer that absorbs water, seepage sensor 7, the silk screen cover is established on the pipe, the inner tube inserts in the pipe with one heart, the discharge orifice has been seted up to the inner tube surface, monitoring well downthehole, the outer filling layer of silk screen external setting, in the pipe, the inlayer filling layer of internal tube external setting, set up a plurality of seepage sensor along the axis direction in the inner tube.
The inner pipe is filled with a water absorbing layer.
The lower part of the outer filling layer is cobblestone, and the upper part is an annular air bag.
The screen mesh is provided with a flange, and the flange of the screen mesh is positioned at the bottom of the well hole after the screen mesh is placed in the well hole of the monitoring well; the concentration of overflowing holes on one side of the inner pipe, which faces the landfill, is greater than that on the side of the inner pipe, which faces away from the landfill, and the inner pipe is a PVC pipe special for a well pipe.
A method for arranging tracking monitoring wells of an anti-seepage system of a landfill comprises a well hole drilling step of the monitoring wells and a monitoring well embedding step.
Further, the monitoring well bore drilling step comprises:
s11: drilling two monitoring well holes which are staggered in an X shape outside the contour of the landfill, wherein the axes of the two well holes form an equal acute angle with the vertical direction; a detection system is arranged in the monitoring well, the detection system is generally a concentration sensor or a fluorescence sensor and the like, the detection system is different according to different leakage detection principles, and the leakage detection principle can be a fluorescence tracing method, a temperature tracing method, an electrode method and the like. The monitoring wells are staggered into a group in an X-shaped mode, and jointly monitor a rectangular area constructed by four vertexes of the X shape when leakage is monitored, certainly, the rectangular area is mainly monitored, leakage diffused outside the area can be observed in the monitoring wells, but the leakage outside the area of the X-shaped monitoring well group is monitored by a later structure more mainly, when leakage occurs, the leakage diffuses in soil, when the leakage reaches a group of X-shaped monitoring wells, the concentration generated in the two monitoring wells is different, the difference can help monitoring personnel to approximately determine the horizontal position of the leakage, the highest concentration values of the leakage on the two inclined monitoring wells are approximately equal in height, and the height position is matched with the horizontal position to determine the final position of the leakage. Two monitoring wells are arranged in an X shape, so that the wrap angle of a landfill is large, and the number of the monitoring wells can be saved.
S12: repeating S11, and uniformly drilling a plurality of groups of well holes in the outer circumferential direction of the landfill profile until the sum of the wrap angles of the well holes to the landfill is more than 240 degrees. The monitoring system is arranged in a plurality of groups of well bores respectively, a landfill site is surrounded, leakage in all directions is monitored, a group of X-shaped monitoring wells are larger in monitoring range compared with monitoring wells vertically arranged, but the whole landfill site cannot be monitored completely, so that a plurality of groups of monitoring wells are arranged to operate together, leakage in all directions can be monitored completely after the total wrap angle is larger than 240 degrees, when the landfill site is circular, the monitoring well groups are uniformly distributed around the landfill site in the circumferential direction, when the landfill site is square, the monitoring well groups are arranged on four sides respectively, the side length of the square landfill site is longer, and a plurality of groups of monitoring wells can be arranged on one side.
Preferably, the acute angle formed by the axis of the well hole and the vertical direction in the step S11 is 20-40 degrees. The inclination angle between the axis of the well hole and the vertical direction is not too large, otherwise, the hole is difficult to drill and the hole can reach a deeper position only by drilling for a long time, the inclination is not too small, otherwise, the wrap angle of a group of monitoring wells relative to a landfill is very small, the coverage range of the monitoring wells cannot be improved, the actual engineering shows that the inclination angle is suitable within the range of 20-40 degrees, the service performance is good, and a monitoring system, a sensor and the like can be conveniently and subsequently arranged in the well.
And optimally, the bottom of the well hole is 1-3 meters lower than the bottom of the landfill in the vertical direction. The leakage of the landfill can be in all directions and downward, but the arrangement of the monitoring wells below the landfill is not practical, so that the depth of some monitoring wells can be increased to monitor the waste liquid leaked downward from some landfill.
Further, the step of burying the monitoring well comprises:
s21: sleeving a section of cylindrical wire mesh on a section of guide pipe, wherein the diameter of the guide pipe is smaller than that of a well hole of the monitoring well;
s22: concentrically inserting a section of inner pipe into the conduit, wherein the surface of the inner pipe is provided with an overflowing hole;
s23: putting the cylindrical wire mesh, the guide pipe and the inner pipe into a well hole of a monitoring well together;
s24: cobblestones are poured into the well hole of the monitoring well and the outside of the silk screen from the ground surface to form an annular outer layer filling layer, an annular air bag replaces the cobblestones to fill the section close to the ground surface, and the lowest part of the annular air bag is lower than the lowest water level of the local surface water by more than 1 meter;
s25: pouring sand and stone into the conduit pipe and the outer pipe from the ground surface to form an inner-layer filling layer, and extracting the conduit pipe while pouring until the inner-layer filling layer is filled to the ground surface;
s26: several leak sensors were implanted along the inner tube axis.
The leakage can be identified only by placing a monitoring system in the monitoring well, the monitoring system is a sensor as the sensor, the sensor in the monitoring well identifies that the waste liquid enters the monitoring well or the concentration of the water body component in the original monitoring well is changed, and the sensor is selected and does not belong to the problem to be solved by the invention and is not in the description scope of the invention. The inner pipe is internally provided with a position for placing a leakage sensor, external leakage liquid can reach the inner part of the inner pipe only by penetrating through the outer filling layer, the inner filling layer and the overflowing hole, the multiple filling layers are used for filtering soil sand grains, and the soil sand grains are prevented from reaching the overflowing hole to block the overflowing hole or enter the inner pipe to cause sediment deposition to influence monitoring performance, and the cobblestone sand stone filtering effect is greatly increased;
the silk screen between the inner and outer filling layers can maintain the shape of the inner and outer filling layers and prevent the sandstone from rolling out of the inner filling layer; and the setting of annular gasbag is for the separation earth's surface water body, the landfill all is open-air, so must have rainy day, the rainwater falls to be absorbed by surface soil behind the earth's surface, flow on the surface layer of soil, few part down flow get into groundwater, and a large amount of water flows in near river as shallow groundwater, the least significant place of river can be as judging the minimum of local surface water, the minimum of annular gasbag is less than this position after, can block most surface water and get into the monitoring well, prevent that it from producing the influence to the monitoring structure, or produce the dilution to leaking the liquid, the influence is leaked and is judged.
Further, the step of burying the monitoring well further comprises the step of S27: the inner tube is filled with a water-absorbing layer. The water in the soil often flows layer by layer, so when the landfill site takes place to leak, the leakage liquid also carries out horizontal leakage by a great part, if it is less to leak the volume, when arriving the monitoring well, can be absorbed by the layer that absorbs water and keep in a certain altitude department, can not be in the low resistance in the monitoring well carry out the motion of direction of height, has just also promoted the monitoring precision of monitoring well to direction of height.
Preferably, the water absorbing layer is sponge. The sponge is light and easy to process, convenient to obtain and form, and has enough water absorption, so that the sponge is an ideal material for carrying out the above process.
Preferably, the screen mesh is provided with a flange, and after the screen mesh is placed in the monitoring well hole, the flange of the screen mesh is positioned at the bottom of the well hole. When the guide pipe is drawn out, the guide pipe can be possibly drawn out along with the silk screen due to the fact that friction force is large, the turned-over edge of the silk screen can prevent the silk screen from moving away from the position when the guide pipe is drawn out, after the silk screen is arranged in the monitoring well, the silk screen can be pressed by the aid of the firstly filled cobblestones, and the silk screen is dragged when the guide pipe is drawn out.
Preferably, the concentration of overflowing holes on the side, facing the landfill, of the inner pipe is greater than that on the side, facing away from the landfill. The greater concentration of flowbore on the side of the landfill that faces the well also makes the monitoring well more sensitive to leakage from the landfill and blocks some of the ground water from the surrounding soil.
Preferably, the inner pipe is a PVC pipe special for a well pipe. The monitoring well is generally more than ten meters, and the length of the monitoring well can be more than twenty meters because the monitoring well is obliquely arranged, so that the inner pipe basically cannot be used as a whole pipe, and the PVC pipe special for the well pipe can be conveniently made into a splicing type because of inconvenient transportation, inconvenient processing and the like, can be conveniently connected by using a clamp, a thread and the like, and has better corrosion resistance and light weight and convenience.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, through the monitoring well groups which are arranged in a crossed manner, the monitoring coverage range of the monitoring wells can be improved, complete leakage monitoring can be obtained by fewer monitoring wells, and the leakage position can be conveniently determined through the leakage parameters identified by the monitoring well group with the largest concentration change; the arrangement of the inner and outer filling layers prevents sand grains in the soil from entering the monitoring well, and prevents the overflowing holes from being blocked or from silting up in the monitoring well; when the inner and outer filling layers are filled, the guide pipe plays a role in isolating and guiding, and is drawn out while filling, so that the operation is convenient; the annular air bag can offset the influence of most surface soil water on the monitoring well, and prevent rainwater from flowing into the monitoring well in the rainy day.
Drawings
In order that the present invention may be more readily and clearly understood, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments that are illustrated in the appended drawings.
FIG. 1 is a schematic perspective view of a monitoring well of the present invention in a landfill, with the monitoring well replaced by a line of no diameter;
FIG. 2 is a schematic view in elevation of a landfill site showing the location of the monitoring wells of the present invention, with no diameter lines replacing the monitoring wells;
FIG. 3 is a schematic view of the top view of the monitoring well of the present invention in a circular landfill;
FIG. 4 is a schematic view of the monitoring well of the present invention in a top view in a square landfill;
FIG. 5 is a rotation of view A-A of FIG. 4;
FIG. 6 is view B of FIG. 5;
FIG. 7 is a schematic structural diagram of the top of the outer filling layer of the present invention.
In the figure: 1-outer layer filling layer, 2-wire mesh, 3-conduit, 4-inner layer filling layer, 5-inner tube, 51-overflowing hole, 6-water absorbing layer and 7-leakage sensor.
Detailed Description
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.
As shown in fig. 1-7, landfill seepage prevention system trails monitoring well and evenly distributes a plurality of groups at the landfill outer circumference, including the crisscross monitoring well of two X-shapes in every monitoring well group, the monitoring well includes outer filling layer 1, the silk screen 2, the pipe 3, inlayer filling layer 4, inner tube 5, the layer 6 that absorbs water, seepage sensor 7, silk screen 2 cover is established on pipe 3, inner tube 5 is concentric to be inserted in pipe 3, discharge hole 51 has been seted up on the surface of inner tube 5, in the monitoring well borehole, outer filling layer 1 is set up outside the silk screen 2, in the pipe 3, inlayer filling layer 4 is set up outside the inner tube 5, set up a plurality of seepage sensor 7 along the axis direction in the inner tube 5.
The inner tube 5 is filled with a water-absorbing layer 6.
The lower part of the outer filling layer 1 is cobblestone, and the upper part is an annular air bag.
The silk screen 2 is provided with a turned-over edge, and the turned-over edge of the silk screen 2 is positioned at the bottom of the well hole after the silk screen 2 is placed into the well hole of the monitoring well; the concentration of the overflowing holes 51 on one side of the inner pipe 5 facing the landfill site is greater than that on the side of the inner pipe 5 facing away from the landfill site, and the inner pipe 5 is a PVC pipe special for a well pipe.
A method for arranging tracking monitoring wells of an anti-seepage system of a landfill comprises a well hole drilling step of the monitoring wells and a monitoring well embedding step.
The step of monitoring the well bore drilling comprises:
s11: drilling two monitoring well bores which are staggered in an X shape outside the profile of the landfill, wherein the axes of the two well bores form an equal acute angle with the vertical direction as shown in figures 1 and 2; a detection system is arranged in the monitoring well, the detection system is generally a concentration sensor or a fluorescence sensor and the like, the detection system is different according to different leakage detection principles, and the leakage detection principle can be a fluorescence tracing method, a temperature tracing method, an electrode method and the like. The monitoring wells are staggered into a group in an X-shaped mode, and jointly monitor a rectangular area constructed by four vertexes of the X shape when leakage is monitored, certainly, the rectangular area is mainly monitored, leakage diffused outside the area can be observed in the monitoring wells, but the leakage outside the area of the X-shaped monitoring well group is monitored by a later structure more mainly, when leakage occurs, the leakage diffuses in soil, when the leakage reaches a group of X-shaped monitoring wells, the concentration generated in the two monitoring wells is different, the difference can help monitoring personnel to approximately determine the horizontal position of the leakage, the highest concentration values of the leakage on the two inclined monitoring wells are approximately equal in height, and the height position is matched with the horizontal position to determine the final position of the leakage. Two monitoring wells are arranged in an X shape, so that the wrap angle of a landfill is large, and the number of the monitoring wells can be saved.
S12: as shown in fig. 3 and 4, S11 is repeated to drill several groups of well bores uniformly in the outer circumferential direction of the landfill profile until the sum of the wrap angles of the well bores to the landfill (a 1+ a2+ …) is greater than 240 °. The monitoring systems are respectively arranged in a plurality of groups of well bores to surround a landfill site and monitor leakage in all directions, one group of X-shaped monitoring wells has a larger monitoring range than that of the vertically arranged monitoring wells, but the whole landfill site cannot be monitored completely, so that the monitoring wells are arranged to operate together, the leakage in all directions can be monitored more completely after the total wrap angle is larger than 240 degrees, when the landfill site is circular, the circumferences of the monitoring well groups are uniformly distributed around the landfill site, when the landfill site is square, the four sides of the landfill site are respectively provided with the monitoring well groups, the side length of the square landfill site is longer, a plurality of groups of monitoring wells can be arranged on one side, for example, more well bores are arranged to enable the wrap angle to be 300 degrees, the periphery of the landfill site can be monitored completely, and after the wrap angle is set to 200 degrees, the detection coverage range can be reduced by more than 30 percent.
In the step S11, the acute angle formed by the axis of the well hole and the vertical direction is 20-40 degrees. If set up the inclination of well bore axis and vertical direction to 50, then the drilling difficulty just will bore very long and can reach deeper position, if set up the inclination of well bore axis and vertical direction to 10, then the cornerite of a set of monitoring well for the landfill is just very little, can't promote the coverage of monitoring well, it reaches more than 240 to make the cornerite, need set up many sets of monitoring well, show in the actual engineering, the angle of inclination is comparatively suitable in 20~40 degrees within ranges, and performance is better, also make things convenient for follow-up in the well to set up monitoring system, sensor etc..
The bottom of the well hole is 1-3 meters lower than the bottom of the landfill in the vertical direction. The leakage of the landfill can be in all directions and downward, but the arrangement of the monitoring wells below the landfill is not practical, so that the depth of some monitoring wells can be increased to monitor the waste liquid leaked downward from some landfill.
The monitoring well burying step comprises the following steps:
s21: sleeving a section of cylindrical wire mesh 2 on a section of guide pipe 3, wherein the diameter of the guide pipe 3 is smaller than that of a monitoring well hole;
s22: a section of the inner tube 5 is concentrically inserted into the catheter 3, as shown in fig. 6, the surface of the inner tube 5 is provided with an overflowing hole 51;
s23: placing the cylindrical wire mesh 2, the guide pipe 3 and the inner pipe 5 into a well hole of a monitoring well together;
s24: cobblestones are poured into the well hole of the monitoring well and the outside of the silk screen 2 from the ground surface to form an annular outer layer filling layer 1, as shown in figure 7, an annular air bag is used for filling instead of the cobblestones at a section close to the ground surface, and the lowest part of the annular air bag is lower than the lowest water level of the local surface water by more than 1 meter;
s25: pouring sand and stone into the conduit 3 and outside the inner pipe 5 from the ground surface to form an inner-layer filling layer 4, and extracting the conduit 3 while pouring until the inner-layer filling layer 4 is filled to the ground surface;
s26: several leak sensors 7 are implanted along the axis of the inner tube 5.
As shown in fig. 5, the monitoring well needs to be placed with a monitoring system to identify leakage, the monitoring system is a sensor as described above, the sensor in the monitoring well identifies that waste liquid enters the monitoring well or that the concentration of the water body component in the original monitoring well changes, and transmits a signal outwards, and the selection of the sensor does not belong to the problem to be solved by the present invention, and is not within the scope of the present invention. The inner pipe 5 is internally provided with a position for placing the leakage sensor 7, external leakage liquid can reach the inner part of the inner pipe 5 only by passing through the outer-layer filling layer 1, the inner-layer filling layer 4 and the overflowing hole 51, the multiple layers of filling layers are used for filtering soil sand grains, and the soil sand grains are prevented from reaching the overflowing hole 51 to block the overflowing hole 51 or enter the inner pipe 5, so that silt deposition is caused, the monitoring performance is influenced, and the cobblestone and sandstone filtering effect is greatly increased;
the silk screen 2 between the inner and outer filling layers 1 can maintain the shape of the inner and outer filling layers 1 and prevent sand from rolling out of the inner filling layer 4; and the setting of annular gasbag is for the separation earth's surface water body, the landfill all is open-air, so must have rainy day, the rainwater falls to be absorbed by surface soil behind the earth's surface, flow on the surface layer of soil, few part down flow get into groundwater, and a large amount of water flows in near river as shallow groundwater, the least significant place of river can be as judging the minimum of local surface water, the minimum of annular gasbag is less than this position after, can block most surface water and get into the monitoring well, prevent that it from producing the influence to the monitoring structure, or produce the dilution to leaking the liquid, the influence is leaked and is judged.
The step of burying the monitor well further comprises step S27: the inner tube 5 is filled with a water-absorbing layer 6. The water in the soil often flows layer by layer, so when the landfill site takes place to leak, the leakage liquid also carries out horizontal leakage by a great part, if it is less to leak the volume, when arriving the monitoring well, can be absorbed by layer 6 that absorbs water and keep in a certain altitude department, can not be in the low resistance in the monitoring well carry out the motion of direction of height, has just also promoted the monitoring precision of monitoring well to direction of height.
The water absorbing layer 6 is sponge. The sponge is light and easy to process, convenient to obtain and form, and has enough water absorption, so that the sponge is an ideal material for carrying out the above process.
The silk screen 2 is provided with a flange, and after the silk screen 2 is placed in the monitoring well hole, the flange of the silk screen 2 is positioned at the bottom of the well hole. The guide pipe 3 may be drawn out with the screen 2 due to the large friction force, and the turned-up edge of the screen 2 can prevent the screen 2 from moving away from the position when the guide pipe 3 is drawn out, because the screen 2 is pressed by the first filled cobblestones after the screen 2 is placed in the monitoring well, and the screen 2 is pulled when the guide pipe 3 is drawn out.
The inner pipe 5 has a greater concentration of flowthrough holes 51 on the side facing the landfill than on the side facing away from the landfill. The greater concentration of flowthrough holes 51 on the side of the landfill that is towards the landfill also makes the monitoring well more sensitive to leakage from the landfill and blocks some of the ground water from the surrounding soil.
The inner pipe 5 is a PVC pipe special for well pipes. The monitoring well is generally more than ten meters, and the length of the monitoring well can be more than twenty meters because the monitoring well is obliquely arranged, so that the inner pipe 5 basically cannot use a whole pipe, and the PVC pipe special for the well pipe can be conveniently made into a splicing type because of inconvenient transportation, inconvenient processing and the like, can be conveniently connected by using a clamp, a thread and the like, and has better corrosion resistance and light weight and convenience.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (1)
1. A method for arranging tracking monitoring wells of an anti-seepage system of a landfill is characterized by comprising the following steps: the arrangement method of the tracking monitoring wells of the landfill anti-seepage system comprises a monitoring well hole drilling step and a monitoring well embedding step;
the monitoring well bore drilling step comprises:
s11: drilling two monitoring well holes which are staggered in an X shape outside the contour of the landfill, wherein the axes of the two well holes form an equal acute angle with the vertical direction;
s12: repeating S11, uniformly drilling a plurality of groups of well holes in the outer circumferential direction of the landfill profile until the total wrap angle of the well holes to the landfill is larger than 300 degrees;
the step of burying the monitoring well comprises the following steps:
s21: sleeving a section of cylindrical wire mesh (2) on a section of guide pipe (3), wherein the diameter of the guide pipe (3) is smaller than that of a well hole of a monitoring well;
s22: a section of inner tube (5) is concentrically inserted into the catheter (3), and the surface of the inner tube (5) is provided with an overflowing hole (51);
s23: the cylindrical wire mesh (2), the guide pipe (3) and the inner pipe (5) are placed into a well hole of a monitoring well together;
s24: cobblestones are poured into the well hole of the monitoring well and the outside of the silk screen (2) from the ground surface to form an annular outer layer filling layer (1), an annular air bag is used for replacing the cobblestones to fill the section close to the ground surface, and the lowest part of the annular air bag is lower than the lowest water level of the local surface water by more than 1 meter;
s25: pouring sand and stone into the conduit (3) and outside the inner pipe (5) from the ground surface to form an inner-layer filling layer (4), and extracting the conduit (3) in the pouring process until the inner-layer filling layer (4) is filled to the ground surface;
s26: implanting a plurality of leakage sensors (7) along the axis of the inner pipe (5);
s27: a water absorbing layer (6) is filled in the inner pipe (5);
the water absorbing layer (6) is sponge;
an acute angle formed by the axis of the well hole and the vertical direction in the step S11 is 20-40 degrees;
the bottom of the well hole is 1-3 meters lower than the bottom of the landfill in the vertical direction.
Priority Applications (1)
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