CN115846384A - Ectopic remediation ultra-deep distribution contaminated soil minimally invasive dredging method - Google Patents
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- CN115846384A CN115846384A CN202211574254.5A CN202211574254A CN115846384A CN 115846384 A CN115846384 A CN 115846384A CN 202211574254 A CN202211574254 A CN 202211574254A CN 115846384 A CN115846384 A CN 115846384A
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- 239000002689 soil Substances 0.000 title claims abstract description 122
- 238000005067 remediation Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000009826 distribution Methods 0.000 title claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 65
- 238000009412 basement excavation Methods 0.000 claims abstract description 43
- 238000011066 ex-situ storage Methods 0.000 claims abstract description 31
- 238000005086 pumping Methods 0.000 claims abstract description 26
- 238000005553 drilling Methods 0.000 claims abstract description 21
- 238000007599 discharging Methods 0.000 claims abstract description 8
- 230000000694 effects Effects 0.000 claims abstract description 6
- 238000010276 construction Methods 0.000 claims description 16
- 239000003673 groundwater Substances 0.000 claims description 13
- 238000005056 compaction Methods 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 230000009471 action Effects 0.000 claims description 7
- 238000005520 cutting process Methods 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 7
- 239000003344 environmental pollutant Substances 0.000 claims description 5
- 230000035699 permeability Effects 0.000 claims description 5
- 231100000719 pollutant Toxicity 0.000 claims description 5
- 239000011150 reinforced concrete Substances 0.000 claims description 5
- 239000011435 rock Substances 0.000 claims description 5
- 230000005484 gravity Effects 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 238000011156 evaluation Methods 0.000 claims description 2
- 238000003860 storage Methods 0.000 claims description 2
- 239000010410 layer Substances 0.000 description 10
- 238000004140 cleaning Methods 0.000 description 6
- 238000011065 in-situ storage Methods 0.000 description 5
- 230000004888 barrier function Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000004567 concrete Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
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- 230000007547 defect Effects 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
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Abstract
The invention discloses a minimally invasive excavation method for ex-situ remediation of ultra-deep distributed polluted soil, which comprises the following steps: the method comprises the steps of pile hole lofting, casing drilling, earthwork dredging, underground water pumping and discharging, pile hole filling and pipe drawing. The invention uses the full rotary sleeve to drill to the underground designated depth, digs the polluted soil in the sleeve, pumps and drains the underground water, backfills and compacts the clean soil, and then carries out the next point position drilling, digs and backfills. The full-rotation sleeve adopts rotation drilling, has small disturbance and has no influence on surrounding buildings (structures), underground pipelines and the like; the excavation depth can reach 50m at most, and the ultra-deep distributed polluted soil can be thoroughly excavated, so that the ex-situ restoration excavation quality requirement is met; clean soil is backfilled after excavation, so that the ex-situ remediation effect is met; the polluted soil is dug and the polluted underground water is pumped and discharged simultaneously in the sleeve, the underground water flow field outside the sleeve is not influenced, and the pollution transfer risk is avoided.
Description
Technical Field
The invention relates to the technical field of ex-situ remediation of contaminated soil, in particular to a minimally invasive excavation method for ex-situ remediation of ultra-deep distributed contaminated soil.
Background
The 'soil cleaning' work is one of three big environmental protection attack and solidness wars in China and is an important component for building beautiful China. With the promulgation and implementation of the soil pollution prevention and control law, the soil pollution prevention and control work is paid unprecedented attention at present. The polluted soil restoration mode comprises in-situ restoration and ex-situ restoration, the in-situ restoration relates to construction defects of limited treatment depth, narrow application range, possibility of causing secondary pollution and the like, and the ex-situ restoration of the polluted soil becomes a commonly used restoration mode at present due to high treatment efficiency and thoroughness.
Ectopic remediation refers to a technique of digging out polluted soil and performing remediation in situ or ex situ. The polluted soil is cleared and excavated by adopting the technologies of direct excavation, slope excavation or excavation after foundation pit supporting, and the like, if the excavation depth exceeds 5 meters (including 5 meters) or the excavation depth does not exceed 5 meters, but the geological conditions and the surrounding environment are complex or the safety of adjacent buildings (structures) is influenced, the deep foundation pit supporting is firstly carried out and then excavation is carried out. The excavation technology causes the problems of large-area excavation, ultra-deep and ultra-large deep foundation pit support, deformation and collapse of deep foundation pits, settlement and deformation of surrounding buildings (structures), large safety risk in the construction process, insufficient backfill compaction degree, large pumping and discharging of underground water to disturb underground water flow fields, difficult construction in limited space, long project construction period, high support cost of deep foundation pits and the like.
Disclosure of Invention
In view of the above, the invention provides a minimally invasive excavation method for ex-situ remediation of ultra-deep distributed contaminated soil, which comprises the steps of drilling to an underground specified depth by using a full-rotation sleeve, excavating the contaminated soil in the sleeve, pumping and draining the underground water, backfilling and compacting the clean soil, and then performing drilling, excavating and backfilling at the next point position, so that a minimally invasive, accurate, efficient and clean excavation technology is provided for excavation of the ultra-deep distributed contaminated soil, and safety risks and secondary pollution caused by excavation of deep foundation pits of the contaminated soil are avoided.
The invention adopts the following technical scheme:
a minimally invasive excavation method for ex-situ remediation of ultra-deep distributed contaminated soil comprises the following steps:
s1, defining a polluted area and lofting pile holes: defining an excavation area according to the wind evaluation report, calculating the coordinates of each pile position according to pile crossing data, determining the position relation between each pile hole and an adjacent control point, and discharging the pile holes in a construction site after rechecking without errors to ensure that the range of the pile holes for lofting covers all the polluted areas;
s2, casing drilling: after a lofting pile hole is measured, selecting a sleeve, placing the sleeve right above the pile hole, starting to rotate and press downwards, driving the steel sleeve to rotate by utilizing the downward pressure and torque generated by full-rotation equipment, and drilling the sleeve into the ground by utilizing the cutting action of a high-strength cutter head at a pipe opening on obstacles such as soil bodies, rock stratums, reinforced concrete and the like;
s3, earthwork dredging: after the casing pipe is drilled into the ground to a preset depth, the earth in the casing pipe is dug by a grab bucket under the wall protection effect of the casing pipe, and the dug polluted soil is transferred to a specified position for storage or disposal;
s4, pumping and draining underground water: after the polluted soil in the sleeve is dug, underground water in the sleeve is pumped and drained, and underground water in the sleeve is pumped and drained by using water pump equipment to water treatment equipment for disposal;
s5, filling and pipe drawing of pile holes: and after the earthwork is dug and underground water in the sleeve is pumped out, filling the pile hole, detecting the backfilling soil to be qualified, compacting the earthwork filled in the pile hole, and jacking and pulling the sleeve section by section after backfilling.
And the sleeve in the step S2 is a steel sleeve with the diameter of 1.5-2 m.
And in the step S2, the drilling depth of the sleeve is greater than the distribution depth of the polluted soil, and when the polluted underground water is distributed, the drilling depth of the sleeve is greater than the distribution depth of the polluted underground water or the sleeve enters a water-impermeable layer and is not less than 1m.
In the step S3, when multiple layers of polluted soil exist, the polluted soil is dug in a layered mode, and the polluted soil is transferred to the appointed position according to the disposal process and the interlayer clean soil.
In the step S3, when underwater excavation is carried out, the waterproof external leakage grab bucket is used, so that no underground water flows out of the casing pipe, and secondary pollution is prevented.
The step S3 and the step S4 are alternately carried out, and if multiple layers of underground water are distributed, the underground water is subjected to layered dredging and pumping drainage, so that mixing is avoided.
In step S4, the underground water level in the casing should be at least 0.5m lower than the dredging depth.
And S4, when polluted underground water is distributed, detecting underground water in the sleeve, and stopping pumping water when the concentration of the target pollutant of the underground water is less than the remediation target value.
In the step S5, the compaction degree of the filling soil is not less than the compaction degree of a natural soil layer around the existing pile hole; the permeability coefficient of backfill soil in the area below the underground water level should not be more than 10 -6 cm/s。
And step 5, compacting the backfilled soil in layers, wherein a 10-15t impact hammer machine is adopted for compaction, the hammer head is lifted to be about 2m away from the soil surface and naturally falls, and the soil is compacted by utilizing the falling gravity of the hammer head.
In the step S5, when the polluted underground water is distributed and the soil is backfilled in a polluted underground water distribution soil layer, the permeability coefficient of the compacted backfilled soil is ensured to be not more than 10 -6 cm/s。
The technical scheme of the invention has the following advantages:
A. according to the invention, the ultra-deep distribution area of the polluted soil is covered by the pile holes, the steel sleeve is driven to rotate by using the downward pressure and torque generated by the full-rotation equipment for each pile hole, the sleeve is drilled into the ground by using the cutting action of the high-strength cutter head at the pipe opening on the barriers such as the soil body, the rock stratum and the reinforced concrete, the excavation, the underground water pumping and drainage and the pile hole filling of the ultra-deep polluted soil are realized by combining the special grab bucket, the precipitation equipment, the tamping equipment and the like, the excavation of the ex-situ remediation ultra-deep polluted soil and the pumping and drainage of the polluted underground water are favorably and quickly finished, and the secondary pollution is avoided. The method is suitable for excavating the extra-deep polluted soil by ex-situ remediation, and is particularly suitable for excavating the ultra-deep polluted soil with small polluted blocks, large depth of distribution areas, limited excavation working surfaces close to subways, river channels and the like, high deformation requirements of buildings around the excavation areas and the like.
B. The invention adopts full-rotary drilling, has small disturbance to the surrounding soil body, has no extrusion and other phenomena to the soil body, underground pipelines, buildings and the like under the cutting action, and meets the deformation control index of the surrounding buildings.
C. The range of the excavated pile hole covers all polluted areas, the sleeve is drilled to a specified depth, the drilling excavation depth can reach 50m, the ultra-deep distributed polluted soil can be thoroughly excavated, and the ex-situ remediation excavation quality standard reaching rate is ensured to be 100%; clean soil is backfilled after the excavation, and the ex-situ remediation quality standard reaching rate is ensured to be 100%.
D. The invention has small single operation surface, the sleeve is used as a protective wall during excavation, and the deep foundation pit support is not needed, thereby saving the support cost of the deep foundation pit. For example, in a 100m & lt 2 & gt polluted area, the pollution distribution depth is 12m, the deep foundation pit support adopts a 20m long cast-in-situ bored pile support and 2 channel type steel inner supports, and the support cost can be saved by about 200 ten thousand yuan due to the adoption of sleeve excavation.
E. The invention excavates polluted soil without supporting a deep foundation pit, avoids the demolition of underground structures such as a deep foundation pit supporting pile, a waterproof curtain and the like during later development, fills piles according to 100 concrete with the length of 15m, and saves the demolition cost of about 100 ten thousand yuan in later period.
F. The invention uses the full-circle-rotation casing to drill into the foundation layer or the soil layer of the high-strength barrier, the soil is dug to a specified depth, the polluted soil is dug in the casing by the grab bucket under the wall protection effect of the casing, the safety risk of the deep foundation pit is avoided, and the accident rate of safety accidents is 0.
G. The cleaning and digging and the dewatering are both carried out in the sleeve, the cleaning and digging of the polluted soil and the pumping and discharging of the polluted underground water are simultaneously finished, the operation in an independent space avoids the disturbance of the underground water flow field caused by the pumping and discharging of a large amount of underground water by the dewatering of the foundation pit, and the migration probability of pollutants is 0 during the construction.
Drawings
FIG. 1 is a process flow diagram of the ectopic remediation ultra-deep distribution contaminated soil minimally invasive dredging method of the invention;
FIG. 2 is a drawing of a contaminated area definition and pile hole layout;
FIG. 3 is a schematic view of the sleeve rotated in;
FIG. 4 is a schematic view of earth excavation within the casing;
FIG. 5 is a schematic view of groundwater pumping;
fig. 6 is a schematic view of pile hole filling and pipe drawing.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
As shown in figure 1, the invention provides a minimally invasive excavation method for ex-situ remediation of ultra-deep distribution contaminated soil, which comprises the following steps:
s1, defining a polluted area and lofting pile holes:
as shown in fig. 2, the excavation area is defined according to the wind assessment report, the coordinates of each pile position are calculated according to the pile intersecting data, the position relation between each pile hole and the adjacent control point is determined, and the pile holes are released in the construction site after being rechecked without errors, so that the range of the pile holes for lofting is ensured to cover the whole pollution area, and the polluted soil is thoroughly excavated.
S2, casing drilling:
as shown in fig. 3, after the pile hole is lofted, a proper sleeve is selected, the sleeve with the diameter of 1.5m or 2m is generally adopted, the sleeve is placed right above the pile hole and starts to rotate and press downwards, the steel sleeve is driven to rotate by using the downward pressure and torque generated by full-rotation equipment, the sleeve is drilled into the ground by using the cutting action of a high-strength cutter head at a pipe opening on barriers such as soil bodies, rock stratums and reinforced concrete, the drilling depth of the sleeve is greater than the distribution depth of polluted soil, and when the polluted ground water is distributed, the drilling depth of the sleeve is greater than the distribution depth of the polluted ground water or is not less than 1m when the polluted ground water is distributed.
S3, earthwork dredging:
the main function is to clear and dig the polluted soil, as shown in fig. 4, the sleeve is drilled into the ground, after the sleeve enters a preset depth, the earth in the sleeve is cleared and dug by the grab bucket under the wall protection effect of the sleeve, and the cleared and dug polluted soil is transferred to a designated position to be stored or disposed; when multiple layers of polluted soil exist, the polluted soil is dug in a layered mode, and the polluted soil is respectively transferred to a designated position according to a disposal process and interlayer clean soil; when underwater cleaning, the waterproof external leakage grab bucket is used, so that no underground water flows out of the sleeve, and secondary pollution is prevented.
S4, pumping and draining underground water:
mainly used for pumping underground water in the casing, as shown in figure 5, after the polluted soil in the casing is dug in a layered mode, the underground water in the casing is pumped and drained, pumping and draining the underground water in the sleeve to water treatment equipment by using equipment such as a water pump and the like for disposal, alternately performing earthwork dredging and underground water pumping, and if multiple layers of underground water are distributed, performing layered dredging and pumping to avoid mixing; after the earthwork is dug to a specified depth, pumping and draining the underground water in the sleeve, wherein the water level of the underground water in the sleeve is 0.5m lower than the digging depth; and when the polluted underground water is distributed, detecting underground water in the sleeve, and stopping pumping water when the concentration of the target pollutant of the underground water is less than the remediation target value.
S5, filling and pipe drawing of pile holes:
as shown in fig. 6, after the earthwork is dug, pile holes are filled, and the quality of the pile hole filling quality seriously affects the later settlement condition and the later construction process of the site and the surrounding buildings. The backfilling soil is qualified by detection and the pileCompacting the earthwork filled in the hole, wherein the compaction degree is not less than the compaction degree of a natural soil layer around the existing pile hole, compacting the backfilled earthwork in a layering manner, lifting the hammer head to about 2m away from the soil surface by adopting a 10-15t impact hammer machine for compaction, and compacting the soil by utilizing the falling gravity of the hammer head; the permeability coefficient of backfill soil in the area below the underground water level should not be more than 10 -6 cm/s. When the polluted underground water is distributed and the soil is backfilled in a soil layer distributed by the polluted underground water, the permeation coefficient of the compacted backfilled soil is not more than 10 -6 cm/s; and after layered backfilling, jacking and pulling the sleeve section by section.
The invention relates to a minimally invasive dredging method for ex-situ remediation of ultra-deep polluted soil, which is characterized in that an ultra-deep distribution area of the polluted soil is covered by pile holes, a single pile hole drives a steel sleeve to rotate by utilizing the downward pressure and torque generated by full-rotation equipment, the sleeve is drilled into the ground by utilizing the cutting action of a high-strength cutter head at a pipe opening on obstacles such as soil bodies, rock stratums, reinforced concrete and the like, and meanwhile, the excavation, underground water pumping and pile hole filling of the ultra-deep polluted soil are realized by combining a special grab bucket, precipitation equipment, tamping equipment and the like, so that the excavation of the ex-situ remediation of the ultra-deep polluted soil, the pumping and draining of polluted underground water are favorably and secondary pollution is avoided. The method is suitable for excavating the extra-deep polluted soil by ex-situ remediation, and is particularly suitable for excavating the ultra-deep polluted soil with small polluted blocks, large depth of distribution areas, limited excavation working surfaces close to subways, river channels and the like, high deformation requirements of buildings around the excavation areas and the like.
The invention adopts full-circle rotary drilling, has small disturbance to the surrounding soil body, does not generate extrusion and other phenomena to the soil body, underground pipelines, buildings and the like under the cutting action, and meets the deformation control index of the surrounding buildings.
The range of the excavated pile hole covers all polluted areas, the sleeve is drilled to a specified depth, the drilling excavation depth can reach 50m, the ultra-deep distributed polluted soil can be thoroughly excavated, and the ex-situ remediation excavation quality standard reaching rate is ensured to be 100%; clean soil is backfilled after the excavation, and the ex-situ remediation quality standard reaching rate is ensured to be 100%.
The invention has small single operation surface, the sleeve is used as a protective wall during excavation, and the deep foundation pit support is not needed, thereby saving the support cost of the deep foundation pit. For example, in a 100m & lt 2 & gt polluted area, the pollution distribution depth is 12m, the deep foundation pit support adopts a 20m long cast-in-situ bored pile support and 2 channel type steel inner supports, and the support cost can be saved by about 200 ten thousand yuan due to the adoption of sleeve excavation.
The invention excavates polluted soil without supporting a deep foundation pit, avoids the demolition of underground structures such as a deep foundation pit supporting pile, a waterproof curtain and the like during later development, fills piles according to 100 concrete with the length of 15m, and saves the demolition cost of about 100 ten thousand yuan in later period.
The single construction of the invention comprises single construction including drilling, excavating, pumping and draining underground water, backfilling and mechanized continuous construction, the construction efficiency is improved by 20 percent, and the construction period is shortened by about 30 to 50 percent.
According to the invention, clean soil is backfilled in the sleeve, and the heavy hammer equipment is adopted for compaction, so that the backfilled soil compaction quality is controllable, the later settlement is controllable, and the safety of surrounding buildings is not influenced by the whole construction process.
The invention uses the full-circle-rotation casing to drill into the foundation layer or the soil layer of the high-strength barrier, the soil is dug to a specified depth, the polluted soil is dug in the casing by the grab bucket under the wall protection effect of the casing, the safety risk of the deep foundation pit is avoided, and the accident rate of safety accidents is 0.
The cleaning and digging and the dewatering are both carried out in the sleeve, the cleaning and digging of the polluted soil and the pumping and discharging of the polluted underground water are simultaneously finished, the operation in an independent space avoids the disturbance of the underground water flow field caused by the pumping and discharging of a large amount of underground water by the dewatering of the foundation pit, and the migration probability of pollutants is 0 during the construction.
Nothing in this specification is said to apply to the prior art.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. And obvious variations or modifications therefrom are intended to be within the scope of the invention.
Claims (11)
1. A minimally invasive excavation method for ex-situ remediation of ultra-deep distributed contaminated soil is characterized by comprising the following steps:
s1, defining a polluted area and lofting pile holes: defining an excavation area according to the wind evaluation report, calculating the coordinates of each pile position according to pile crossing data, determining the position relation between each pile hole and an adjacent control point, and discharging the pile holes in a construction site after rechecking without errors to ensure that the range of the pile holes for lofting covers all the polluted areas;
s2, casing drilling: after a lofting pile hole is measured, selecting a sleeve, placing the sleeve right above the pile hole, starting to rotate and press downwards, driving the steel sleeve to rotate by utilizing the downward pressure and torque generated by full-rotation equipment, and drilling the sleeve into the ground by utilizing the cutting action of a high-strength cutter head at a pipe opening on obstacles such as soil bodies, rock stratums, reinforced concrete and the like;
s3, earthwork dredging: after the casing pipe is drilled into the ground to a preset depth, the earth in the casing pipe is dug by a grab bucket under the wall protection effect of the casing pipe, and the dug polluted soil is transferred to a specified position for storage or disposal;
s4, pumping and draining underground water: after the polluted soil in the sleeve is dug, underground water in the sleeve is pumped and drained, and underground water in the sleeve is pumped and drained by using water pump equipment to water treatment equipment for disposal;
s5 filling and pipe drawing of pile holes: and after the earthwork is excavated and underground water in the sleeve is pumped and drained, filling the pile hole, detecting qualified backfilling soil, compacting the earthwork filled in the pile hole, and jacking and pulling the sleeve section by section after backfilling.
2. The ex-situ remediation ultra-deep distributed contaminated soil minimally invasive dredging method according to claim 1, wherein in the step S2, a steel sleeve with a diameter of 1.5m-2m is selected as the sleeve.
3. The ex-situ remediation ultra-deep distributed contaminated soil minimally invasive dredging method according to claim 1, wherein the drilling depth of the casing in step S2 is greater than the distribution depth of the contaminated soil, and when the contaminated groundwater is distributed, the drilling depth of the casing should be greater than the distribution depth of the contaminated groundwater or not less than 1m into the impervious bed.
4. The ex-situ remediation ultra-deep distributed contaminated soil minimally invasive dredging method according to claim 1, wherein in the step S3, when multiple layers of contaminated soil exist, the contaminated soil is subjected to layered dredging, and the contaminated soil is transferred to a designated position according to a disposal process and the layered clean soil.
5. The ex-situ remediation ultra-deep distributed contaminated soil minimally invasive dredging method according to claim 1, wherein in the step S3, when underwater dredging is performed, a waterproof outer-leakage grab bucket is used, so that no underground water flows out of the casing pipe, and secondary pollution is prevented.
6. The ex-situ remediation ultra-deep distributed contaminated soil minimally invasive dredging method according to claim 1, wherein the step S3 and the step S4 are performed alternately, and if multiple layers of underground water are distributed, the soil is subjected to layered dredging and pumping to avoid mixing.
7. The method for ex-situ remediation of minimally invasive dredging of ultra-deep distributed contaminated soil according to claim 1, wherein in step S4, the level of groundwater in the casing is at least 0.5m below the dredging depth.
8. The ex-situ remediation ultra-deep distributed contaminated soil minimally invasive dredging method according to claim 1, wherein in step S4, when contaminated groundwater is distributed, groundwater in the casing is detected, and when the groundwater target pollutant concentration is smaller than a remediation target value, pumping is stopped.
9. The ex-situ remediation ultra-deep distributed contaminated soil minimally invasive dredging method according to claim 1, wherein the filling soil compaction degree in the step S5 is not less than the compaction degree of the natural soil layer around the existing pile hole; the permeability coefficient of backfill soil layer in the region below the underground water level should not be more than 10 -6 cm/s。
10. The ex-situ remediation ultra-deep distributed contaminated soil minimally invasive dredging method according to claim 9, wherein in the step S5, the backfilled soil is compacted in a layered manner, a 10-15t hammer impact machine is adopted for compaction, the hammer head is lifted to about 2m from the soil surface and naturally falls, and the soil is compacted by using the falling gravity of the hammer head.
11. The ex-situ remediation ultra-deep distributed contaminated soil minimally invasive dredging method according to claim 9, wherein in step S5, when the contaminated groundwater is distributed, and when the contaminated groundwater is distributed and the soil is backfilled in the contaminated groundwater distribution soil layer, it is ensured that the permeability coefficient of the compacted backfilled soil is not greater than 10 -6 cm/s。
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| CN110935721A (en) * | 2019-12-25 | 2020-03-31 | 中科鼎实环境工程有限公司 | Closed soil taking system for polluted soil and soil taking replacement repair method |
| CN114888066A (en) * | 2021-04-23 | 2022-08-12 | 四川轻化工大学 | Flexible lining method and method for treating, monitoring and treating polluted site by using same |
| CN217267706U (en) * | 2022-01-25 | 2022-08-23 | 天津市博川岩土工程有限公司 | Polluted soil dredging device |
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