CN105527119A - A drilling method preventing secondary pollution for reconnaissance of a polluted site - Google Patents
A drilling method preventing secondary pollution for reconnaissance of a polluted site Download PDFInfo
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- CN105527119A CN105527119A CN201511013126.3A CN201511013126A CN105527119A CN 105527119 A CN105527119 A CN 105527119A CN 201511013126 A CN201511013126 A CN 201511013126A CN 105527119 A CN105527119 A CN 105527119A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/04—Devices for withdrawing samples in the solid state, e.g. by cutting
- G01N1/08—Devices for withdrawing samples in the solid state, e.g. by cutting involving an extracting tool, e.g. core bit
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
- G01N2001/1031—Sampling from special places
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- Life Sciences & Earth Sciences (AREA)
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- Health & Medical Sciences (AREA)
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- General Health & Medical Sciences (AREA)
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- Hydrology & Water Resources (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention relates to the field of environmental geotechnics and particularly relates to a drilling method preventing secondary pollution for reconnaissance of a polluted site. The method is characterized in that after the polluted site is drilled to a prescribed depth and soil layer identification or sampling is finished, a protective tube the diameter of which is larger than the diameter of a drilling hole and the length of which allows the tube to reach the present drilling depth is implanted into the drilling hole, thus separating underground water and hole circumferential soil of the drilling hole from the hole opening to the present depth. The method is advantageous in that accuracy of reconnaissance for the site is ensured, cross contamination of water and soil of different depths in reconnaissance processes is effectively prevented, pollution dispersal caused in reconnaissance processes is effectively controlled, the polluted range of the site can be reflected veritably, and the method is convenient in construction, simple in device, convenient to operate and suitable for popularization.
Description
Technical field
The present invention relates to environmental geotechnical field, in contaminated site prospecting, especially prevent the drilling method of secondary pollution.
Background technology
In recent years, industrial enterprise moves, leave over the day by day urgent of place redevelopment demand, in order to avoid industrial sites brings harm to human health and ecologic environment after change Land-Use, needs place is carried out to necessary investigation, assessed even repairing and treating.
The soil and groundwater that site investigation need gather place detects, measure the concentration of pollutant, generally, the soil of different depth need be gathered, then need boring with sampling, gather underground water water sample and need build groundwater monitoring well, and traditional boring with sampling may bring the pollutant of top layer or shallow-layer into deep, do not accomplish to pollute isolation, need to carry out large area boring with sampling in the fact-finding process of place, carry out staged isolation if do not taken effective measures, polluter diffusion in place can be made, produce secondary pollution.
Pollution isolation tool in fact-finding process has very great significance; both the contaminated sites material diffusion that fact-finding process causes had been avoided; truly can reflect again actual pollution condition and the scope of place different depth; avoid the erroneous judgement because the cross pollution in fact-finding process causes pollution range; and in present stage; domestic carrying out also cannot accomplish in the process of site investigation work to pollute isolation; effective isolation is conducive to ensureing the accuracy of investigation and the protection to underground soil and water resources, so need a kind of contaminated site drilling method preventing secondary pollution badly.
Summary of the invention
The object of the invention is according to above-mentioned the deficiencies in the prior art, provide the drilling method preventing secondary pollution in contaminated site prospecting, the top soil body and underground water that complete sampling of fetching earth is isolated by pipe laying, avoid the contaminated sites material diffusion that drilling process causes, truly can reflect again actual pollution condition and the scope in place, avoid the erroneous judgement because the cross pollution in exploration process causes pollution range.
The object of the invention realizes being completed by following technical scheme:
A kind of drilling method preventing secondary pollution in contaminated site prospecting, relate in contaminated site by probing, creep in designated depth and differentiate soil layer or sampling, it is characterized in that: after the designated depth of described contaminated site creeps into discriminating soil layer or sampling completes, by the pillar that implanted diameter is greater than its aperture in the borehole, length can reach current drilling depth, thus all soil of underground water and hole between from the aperture of described boring to current depth is implemented isolation.
Probing can adopt screw thread drilling tool or core barrel to circle round the mode of creeping into, and in viscous soil horizon, creep into the drilled dry mode should taking not add drill-in fluid, carrying brill should be at a slow speed.Adopt screw thread drilling tool to creep into, should bore less and carry more, every round trip drilling depth should not be greater than 0.5m.
Tunneling boring core drill enters the rig that should adopt pressue device, and creep into and can adopt single tube or two-tube single action core drilling tool, low speed should be adopted to bore slowly, and drilling speed should control within 60r/min, and drilling pressure should control at 3kN-6kN.
After boring perforate, should underground water table be splashed, should stop in time after meeting water to bore, after underground water oozes out at the bottom of hole, take water sample.
Described pillar by or hammering or vibrations or the mode of static pressure bury underground.
Described designated depth refers to the multiple designated depth in described contaminated site, complete successively from shallow to deep in described contaminated site each designated depth creep into differentiate soil layer or sampling after, the described pillar that diameter is greater than boring aperture, length can reach current depth is buried in synchronous follow-up underground, realize described boring from aperture to described current designated depth between underground water drilling hole week soil isolation.
Multiple joining end to end of described pillar connects, be satisfied with current drilling depth to described boring scope internal drilling hole, aperture week water and soil all isolate by pillar, and the unlikely requirement having influence on the underground water and soil of next drilling depth scope.
After imbedding described pillar, remove the surflaes entered in described pillar.
The surflaes cleaned out in pillar carries out before next round trip creeps into, should adopting clean water drilling tool.
After the sampling is complete, in described pillar, pour into filling material to hole with shutoff.
Filling material can adopt the mud of special configuration, grout, clay as suitable in moisture proportioning or will be mixed with bentonitic flyash and water according to a certain percentage mix modulate and form, meet the denseness needed for sealing of hole and low-permeability, should playing after slip casting prevents from holing becomes the effect of contamination passage.Perfusion adopts special slip casting equipment up progressively to fill boring at the bottom of hole.
Adopt static(al) or mode of vibration above to promote except pillar at a slow speed, should be noted control upward strain speed, to ensure mud to be retained in formation column seal in boring, shutoff is holed, and preventing from holing becomes the passage of top polluter diffusion.
For heavy metal pollution place, spiral drill or other soil sample barrels all should to use stainless steel.
Advantage of the present invention is: the accuracy being conducive to ensureing site investigation work and the cross pollution effectively preventing in site investigation process, effectively control the contamination caused in fact-finding process, truly can reflect the actual pollution condition at different depth place, place; Easy construction, device are simple, convenient operation, be suitable for promoting.
Accompanying drawing explanation
Fig. 1 is process flow diagram of the present invention;
Fig. 2 is structural representation I of the present invention;
Fig. 3 is structural representation II of the present invention;
Fig. 4 is structural representation III of the present invention.
Embodiment
Feature of the present invention and other correlated characteristic are described in further detail by embodiment below in conjunction with accompanying drawing, so that the understanding of technician of the same trade:
As Figure 1-4, mark 1-5 in figure to be expressed as: contaminated site 1, boring 2, first segment pillar 3, second section pillar 4, Section of three pillar 5.
Embodiment: prevent the drilling method of secondary pollution will be described in conjunction with simulative example in contaminated site prospecting in the present embodiment.Simulative example is as described below: according to analysis, may organic contamination be there is in certain contaminated site 1, need the soil gathering these three designated depth scopes of 0-0.5m, 1-2m and 3-4m in this contaminated site 1 as soil sample, to the Monitoring factors of soil sample be: pH, TPH, VOC and SVOC.Owing to will avoid disturbance when VOC samples, therefore spot sampling needs to adopt undisturbed soil soil sample barrel, adopts rig to carry out drilling operation.
Drilling method is implemented according to step as shown in Figure 1, the 1-4 step in figure, and be the process (except non-drilled reaches ultimate depth---i.e. hole termination depth) that iterative cycles is implemented, each step has following explanation:
1) first gather veneer of soil, because this designated depth of 0-0.5m is more shallow, can directly use undisturbed soil soil sample barrel to take out the soil at the 0-0.5m place on contaminated site 1 top.When concrete operations, technician opens undisturbed soil soil sample barrel, from middle collected specimens, loads in particular sample bottle.
When after the soil sample having gathered 0-0.5m place, by the first pillar 3 by or hammering or vibration or the mode of static pressure bury current drilling depth underground, the diameter of the first pillar 3 fetches earth slightly larger than 0-0.5m place the aperture in opened hole, the length of the first pillar 3 should reach designated depth simultaneously, namely the length of the first pillar 3 should equal or can expose earth's surface slightly larger than 0.5m(redundance), as shown in Figure 2.So, in 0-0.5m depth range hole week soil isolate block by the first pillar 3, just cross pollution is caused among the soil layer that the soil in 0-0.5m depth range can be avoided in follow-up boring, sampling operation to be scattering into more depths like this, affect the accuracy of pollution monitoring simultaneously, the true pollution condition of contaminated site 1 cannot be reflected.
2) adopt spiral drill or other soil sample barrels to clear up in current 0-0.5m depth range the surflaes entered in the first pillar 3, this surflaes be to enter slightly larger than the first pillar 3 of open pore size from hole wall between the remaining soil body.
3), after cleaning out the surflaes in the first pillar 3, utilizing before rig carries out creeping into of the 1-2m degree of depth, the drilling tool of application clean water rig, avoids the accuracy with surflaes impact monitoring on drilling tool.
4) rig is utilized to creep into, drilling tool from the first pillar 3 across and into hole subsoil body, creep into downwards from 0.5m at the bottom of hole and form boring 2 to 2m place, in the process, undisturbed soil soil sample barrel also can be utilized to take out soil within the scope of 1-2m designated depth as soil sample.Now, due to the soil in 0-0.5m depth range isolate by the first pillar 3, therefore in the drilling process of rig, hole in 0-0.5m depth range week soil and underground water can not down be scattered, also would not to 1-2m depth range generation cross pollution.
5) after the soil sample in contaminated site 1 in 1-2m depth range completes, second pillar 4 is connected with the first pillar 3 head and the tail, by or hammering vibration or static pressure mode implant bore bottom, namely lengthen after pillar (pillar 3 adds pillar 4) be deep into 2m place, underground.And the second pillar 4 is connected with the first pillar 3, its bury underground must be satisfied with designated depth to boring 2 aperture between all segregate requirement of drilling hole Zhou Tujun, that is the second pillar 4 be connected and the continuous length of the first pillar 3 need be greater than 2m, now the length of the first pillar 3 equals or slightly larger than 0.5m, therefore the length of the second pillar 4 can be about 1.5m, first pillar 3 is positioned at 1.5-2m depth range place, and the second pillar 4 is positioned at 0-1.5m depth range place, as shown in Figure 3.So so, in 0-2m depth range hole week soil by the first pillar 3 and the second pillar 4 isolate block, just cross pollution is caused among the soil layer that the soil in 0-2m depth range can be avoided in follow-up boring, sampling operation to be scattering into more depths like this, affect the accuracy of pollution monitoring, the true pollution condition at the different depth place of contaminated site 1 cannot be reflected.
6) repeat step 2), 3), namely the surflaes in pillar is cleared up, drilling tool is cleaned.
7) the same with the method gathering soil in 1.5-2m depth range, gather the soil in 3-4m depth range.As shown in Figure 4, the first pillar 3 length is 0.5m, is positioned at 3.5-4m depth range, and the second pillar 4 length is 1.5m, is positioned at 2-3.5m depth range, and the 3rd pillar 5 length is 2m, is positioned at 0-2m depth range.
8) after the soil within the scope of three groups of designated depth has all gathered, namely hole behind whole hole, the mud of mixing special configuration up progressively fills boring at the bottom of hole, and mud meets denseness needed for sealing of hole and low-permeability, and the effect of slip casting prevents from holing becoming the effect of contamination passage.
9) upper promotion is except pillar at a slow speed to adopt static(al) or mode of vibration, and attention need control upward strain speed, forms column seal, shutoff boring, prevent top from polluting the passage being formed secondary pollution by boring to ensure to be retained in by mud in boring.
The present embodiment is in the specific implementation: the first pillar 3 and can arrange connector between the second pillar 4, second pillar 4 and the 3rd pillar 5, thus utilize connector to make to be interconnected and fixed between pillar between two when burying underground, improving the structural strength of pillar, stability thus improve while hole week native isolation effect, also realize entirety to pull out when pulling out pillar, constructability.
When needing the designated depth scope being greater than three among collection contaminated site 1, can according to foregoing description, after completing the sampling of each designated depth from shallow to deep successively, all bury the pillar that diameter is greater than boring aperture, length is not more than maximum designated depth underground, the week soil of the hole between the aperture of boring 2 to maximum designated depth is isolated.The quantity of pillar and the quantity of designated depth scope match, and multiple pillar realizes joining end to end connecing, be satisfied with maximum designated depth to boring 2 aperture between hole Zhou Tujun the requirement isolated by pillar.
Probing can adopt screw thread drilling tool or core barrel to circle round the mode of creeping into, and in viscous soil horizon, creep into the drilled dry mode should taking not add drill-in fluid, carrying brill should be at a slow speed.Adopt screw thread drilling tool to creep into, should bore less and carry more, every round trip drilling depth should not be greater than 0.5m.
Tunneling boring core drill enters the rig that should adopt pressue device, and creep into and can adopt single tube or two-tube single action core drilling tool, low speed should be adopted to bore slowly, and drilling speed should control within 60r/min, and drilling pressure should control at 3kN-6kN.
After boring perforate, should underground water table be splashed, should stop in time after meeting water to bore, after underground water oozes out at the bottom of hole, take water sample.
Mud can adopt grout, clay as suitable in moisture proportioning or will be mixed with bentonitic flyash and water according to a certain percentage mix modulate and form, meet the denseness needed for sealing of hole and low-permeability.Perfusion adopts special slip casting equipment up progressively to fill boring at the bottom of hole.
For heavy metal pollution place, spiral drill or other soil sample barrels all should to use stainless steel, avoid instrument to corrode.
Claims (7)
1. one kind prevents the drilling method of secondary pollution in contaminated site prospecting, relate in contaminated site by probing, creep in designated depth and differentiate soil layer or sampling, it is characterized in that: after the designated depth of described contaminated site creeps into discriminating soil layer or sampling completes, by the pillar that implanted diameter is greater than its aperture in the borehole, length can reach current drilling depth, thus all soil of underground water and hole between from the aperture of described boring to current depth is implemented isolation.
2. according to claim 1ly a kind ofly in contaminated site prospecting, prevent the drilling method of secondary pollution, it is characterized in that: described pillar by or hammering or to vibrate or static pressure mode is buried underground.
3. a kind of drilling method preventing secondary pollution in contaminated site prospecting according to claim 1, it is characterized in that: described designated depth refers to the multiple designated depth in described contaminated site, complete successively from shallow to deep in described contaminated site each designated depth creep into differentiate soil layer or sampling after, the described pillar that diameter is greater than boring aperture, length can reach current depth is buried in synchronous follow-up underground, realize described boring from aperture to described current designated depth between underground water and drilling hole week soil isolation.
4. a kind of drilling method preventing secondary pollution in contaminated site prospecting according to claim 3, it is characterized in that: multiple described pillar joins end to end and connects, be satisfied with maximum designated depth to described boring aperture between described drilling hole week underground water and soil all the requirement isolated by pillar.
5. according to claim 1ly a kind ofly in contaminated site prospecting, prevent the drilling method of secondary pollution, it is characterized in that: after imbedding described pillar, remove the surflaes entered from hole wall in described pillar.
6. according to claim 1ly a kind ofly in contaminated site prospecting, prevent the drilling method of secondary pollution, it is characterized in that: completing after whole boring creeps into or sample, in described pillar, pouring into filling material from bottom to top hole with shutoff.
7. a kind of drilling method preventing secondary pollution in contaminated site prospecting according to claim 1, is characterized in that: after pouring into filling material in the borehole, adopts static(al) or vibration mode to be pulled out from boring by pillar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201511013126.3A CN105527119A (en) | 2015-12-31 | 2015-12-31 | A drilling method preventing secondary pollution for reconnaissance of a polluted site |
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| CN201511013126.3A CN105527119A (en) | 2015-12-31 | 2015-12-31 | A drilling method preventing secondary pollution for reconnaissance of a polluted site |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106596176A (en) * | 2016-12-23 | 2017-04-26 | 上海岩土工程勘察设计研究院有限公司 | Integrated water and soil sampling method |
| CN106680033A (en) * | 2016-12-23 | 2017-05-17 | 上海岩土工程勘察设计研究院有限公司 | Static cone penetration test type underground water sampling method |
| CN106680023A (en) * | 2016-12-23 | 2017-05-17 | 上海岩土工程勘察设计研究院有限公司 | Pollution-isolating soil-sampling method |
| CN107036841A (en) * | 2016-12-23 | 2017-08-11 | 上海岩土工程勘察设计研究院有限公司 | A kind of water and soil integrated sampling device |
| CN108036968A (en) * | 2018-01-15 | 2018-05-15 | 浙江省农业科学院 | Soil sampling anti-cross-contamination control panel |
| CN113607479A (en) * | 2021-06-22 | 2021-11-05 | 中交第三航务工程勘察设计院有限公司 | Offshore geotechnical engineering confined water sampling device and method |
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| CN107036841B (en) * | 2016-12-23 | 2024-03-22 | 上海勘察设计研究院(集团)股份有限公司 | Soil and water integration sampling device |
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| CN113607479A (en) * | 2021-06-22 | 2021-11-05 | 中交第三航务工程勘察设计院有限公司 | Offshore geotechnical engineering confined water sampling device and method |
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Application publication date: 20160427 |
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