CN110756570A - Subsurface excavation remediation method for deep polluted soil - Google Patents
Subsurface excavation remediation method for deep polluted soil Download PDFInfo
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- CN110756570A CN110756570A CN201911002913.6A CN201911002913A CN110756570A CN 110756570 A CN110756570 A CN 110756570A CN 201911002913 A CN201911002913 A CN 201911002913A CN 110756570 A CN110756570 A CN 110756570A
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- 239000002689 soil Substances 0.000 title claims abstract description 123
- 238000009412 basement excavation Methods 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000005067 remediation Methods 0.000 title claims description 21
- 238000003900 soil pollution Methods 0.000 claims abstract description 21
- 238000010276 construction Methods 0.000 claims abstract description 17
- 238000009826 distribution Methods 0.000 claims abstract description 12
- 238000004088 simulation Methods 0.000 claims abstract description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 48
- 239000010959 steel Substances 0.000 claims description 48
- 239000002131 composite material Substances 0.000 claims description 5
- 238000011066 ex-situ storage Methods 0.000 claims description 5
- 239000004746 geotextile Substances 0.000 claims description 3
- 229920006262 high density polyethylene film Polymers 0.000 claims description 3
- 238000002955 isolation Methods 0.000 claims description 2
- 238000011109 contamination Methods 0.000 claims 2
- 238000004458 analytical method Methods 0.000 abstract description 3
- 238000003912 environmental pollution Methods 0.000 abstract description 3
- 239000010865 sewage Substances 0.000 abstract description 3
- 238000003860 storage Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000011065 in-situ storage Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D19/00—Provisional protective covers for working space
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
- E21F15/005—Methods or devices for placing filling-up materials in underground workings characterised by the kind or composition of the backfilling material
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention provides a subsurface excavation repairing method for deep polluted soil, which comprises the following steps: 1) site review and analysis; 2) simulating three-dimensional data of pollution distribution; 3) designing excavation parameters and preparing construction work; 4) constructing a working well; 5) grouting and supporting the small guide pipe; 6) longitudinally excavating polluted soil; 7) repairing the polluted soil; 8) and (5) backfilling clean soil. According to the method, an underground excavation mode is adopted, the soil pollution range determined by pollution distribution three-dimensional data simulation is combined, the polluted soil is excavated at a fixed point, the ground space is not occupied, the soil which is not polluted on the ground surface does not need to be excavated, large-scale support is not needed, the construction cost is saved, the environmental pollution such as atmosphere, sewage, noise and the like generated by the open excavation of the polluted soil is reduced, the requirements of human living environment are met, and the method is suitable for repairing the deep polluted soil with the depth of more than 5 m.
Description
Technical Field
The invention belongs to the technical field of soil remediation, and particularly relates to a subsurface excavation remediation method for deep contaminated soil.
Background
At present, in most of the industries of gas stations, metallurgy, petroleum, chemical industry and the like, because of local leakage of oil storage tanks and transportation pipelines, the deep soil is seriously polluted and even underground water is polluted because of the need of supporting national economic development, maintaining social stability and failing to stop production or needing normal business. At present, in-situ remediation and ex-situ remediation technologies are mainly used for soil remediation, in-situ remediation refers to the direct in-situ remediation or treatment of contaminated soil at the site without moving the contaminated soil, such as vapor extraction, in-situ chemical oxidation and the like. The ectopic restoration is to excavate polluted soil from a polluted position and treat the polluted soil within an original site range or after transportation, the restoration technology needs to excavate the polluted soil to a restoration workshop for restoration by large excavation, for deep polluted soil, soil which is not polluted on the earth surface needs to be excavated, the invalid excavation earthwork amount is large, manpower and material resources are wasted, and the normal operation of ground buildings and the like is influenced by dismantling the overground building.
Disclosure of Invention
The invention aims to solve the problems that the existing in-situ restoration technology has long restoration period and incomplete restoration, and the ex-situ restoration technology has large invalid excavation earth volume and wastes manpower and material resources.
Therefore, the invention provides an underground excavation repairing method for deep polluted soil, which comprises the following steps:
1) investigating soil pollution distribution conditions and hydrogeological conditions of a construction site, and determining a working space required by construction;
2) performing three-dimensional data simulation according to the soil pollution distribution condition investigated in the step 1), and determining the soil pollution range and the pollution depth;
3) designing the depth and the plane size of the working well and the underground excavation radius of deep polluted soil according to the soil pollution range and the depth determined in the step 2);
4) excavating a working well to a designed depth outside the soil pollution range;
5) setting a small advanced guide pipe at the boundary of the longitudinal range of the polluted soil for grouting support by taking the determined underground excavation radius as a semicircle at the bottom of the working well;
6) the method comprises the following steps of 1, excavating polluted soil in a longitudinal range of an underground excavation radius by using an excavator, temporarily supporting an excavation boundary erection steel arch frame by completing one footage in an excavating process, and arranging a vertical steel support at the center of an excavation area to be connected with the steel arch frame to form an excavation area temporary middle support;
7) conveying the excavated polluted soil in the step 6) out of the working well, and performing ex-situ remediation on the polluted soil;
8) after the polluted soil is dug up, backfilling and compacting the clean soil repaired in the step 7), and simultaneously, synchronously removing the steel arch frame and the vertical steel support in the backfilling process.
Further, in the step 2), three-dimensional data simulation adopts EVS and Arcgis software to carry out three-dimensional modeling on survey data, and the spatial structure of deep polluted soil is analyzed in multiple angles and multiple sections.
Furthermore, the depth of the working well is 20cm below the soil pollution depth, and the underground excavation radius of the deep polluted soil is the maximum value of the longitudinal projection of the soil pollution range.
Further, when the working well is excavated in the step 4), when one footage is excavated, the grid steel frames are erected and concrete is sprayed, the concrete spraying is performed in a circulating mode, and the footage of each layer is controlled within the range of 0.70-1.40 m.
Furthermore, the drilling depth of the small guide pipe is 3-5 m.
Further, the polluted soil is excavated in the step 6) by adopting an annular excavation reserved core soil method, and the excavation footage is 50-60 cm.
Further, the polluted soil dug out in the step 7) is firstly temporarily stored in a working well for piling, and is firstly piled with 1.0mm HDPE film plus 150g/m2And laying polluted soil of 30cm above the composite geomembrane of the non-woven geotextile, paving and compacting the polluted soil to form an isolation layer, and stacking the polluted soil.
Further, the steel arch frame and the vertical steel support are detachably connected through fasteners, and the bottom of the vertical steel support is connected with the bottom surface of the excavated steel plate through bolts by adopting a square steel plate with the thickness of 2 cm.
Compared with the prior art, the invention has the beneficial effects that:
(1) the subsurface excavation repairing method for the deep polluted soil provided by the invention adopts an underground subsurface excavation mode, combines the soil pollution range determined by the pollution distribution three-dimensional data simulation, performs fixed-point excavation on the polluted soil, does not occupy the ground space, does not need to excavate soil with uncontaminated ground surface, does not need large-scale support, saves the construction cost, reduces the environmental pollution such as atmosphere, sewage, noise and the like generated by open excavation of the polluted soil, meets the requirements of human living environment, and is suitable for repairing the deep polluted soil with the depth of more than 5 meters.
(2) The supporting structure for underground construction in the subsurface excavation remediation method for deep polluted soil provided by the invention can be detached and reused, so that the construction cost is saved.
The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
FIG. 1 is a process flow diagram of the present invention for a method of subsurface remediation of deep contaminated soil;
FIG. 2 is a construction drawing of the method for subsurface remediation of deep contaminated soil according to the present invention;
FIG. 3 is a construction drawing for cleaning contaminated soil according to the present invention;
fig. 4 is a schematic view of the installation structure of the steel arch and the vertical steel support in the invention.
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 and 2, the present embodiment provides an excavation remediation method for deep contaminated soil, including the following steps:
(1) and (4) site reexamination and analysis, investigation of soil pollution distribution conditions and hydrogeological conditions of a construction site, and determination of a working space required by construction.
Specifically, the original survey report and detection data of the site are combined, the pollution condition of deep polluted soil (the depth is more than 5 m) is analyzed, the soil is subjected to encrypted stationing and rechecking, sampling analysis is carried out, the spatial distribution of the polluted soil is determined, meanwhile, hydrogeological data of the site is rechecked, characteristic parameters of the survey site are supplemented, the working space of each unit system is designed, and the position of an underground pipeline is avoided. During construction, settlement monitoring and environment monitoring are carried out according to design files and the requirements of the current monitoring standard.
(2) And (3) performing three-dimensional data simulation according to the soil pollution distribution condition investigated in the step (1) to determine the soil pollution range and the pollution depth.
Specifically, the pollution condition is statistically analyzed by adopting EVS three-dimensional geological modeling, a visual deep soil pollution distribution space is established, the model can be cut in any form, multi-angle observation is carried out, meanwhile, seamless data interaction is realized with arcgis software, and the pollution range and the pollution depth of the deep soil are determined. The EVS three-dimensional geological modeling process is the prior art, and the specific operation process is not described herein again.
(3) And (3) designing excavation parameters, namely designing the depth and the plane size of the working well and the underground excavation radius of deep polluted soil according to the soil pollution range and the depth determined in the step (2).
Specifically, in order to prevent diffusion of polluted soil caused by rainfall and groundwater migration and pollute clean soil around, the depth of the working well is designed to be 20cm below a deep polluted soil bottom plate, and the working well is a space which can accommodate a digging machine and a forklift and works and is about 5m multiplied by 8 m. The underground excavation radius is the maximum value of the longitudinal projection of the polluted area, the underground excavation construction preparation work comprises equipment, materials and the like, and the selection of types, specifications and incoming inspection and acceptance meet the relevant regulations of the construction method.
(4) And (4) constructing a working well, and excavating the working well to the designed depth outside the soil pollution range.
Specifically, when the working well is excavated, a step-by-step excavation mode is adopted, the middle soil body of the vertical well is excavated firstly, water accumulation around the vertical well is prevented, and when one ruler is excavated, the grid steel frame is erected in time to spray concrete, and the concrete is circulated until the working well is excavated to the bottom plate of the working well. The working well excavation footage is determined according to the size of the grid steel frame, and according to the geological condition, the footage of each layer is controlled within 0.70-1.40 m, and the over excavation is strictly prohibited.
The grid steelframe that processes two kinds of joint forms in this embodiment, the upper and lower circulation adopts the grid steelframe that different connect respectively, and the joint position staggers avoids appearing the through seam, and the tight steelframe of first grid faces the fore shaft circle and arranges.
(5) Grouting and supporting small guide pipes, namely constructing advanced small guide pipes on the boundary of the longitudinal range of the polluted soil to perform grouting and supporting by taking the determined underground excavation radius as a semicircle at the bottom of the working well so as to prevent the polluted soil from collapsing in the excavation process; wherein the small guide pipe is a pointed steel pipe with the length of 3-5 cm.
Specifically, before the small guide pipe is drilled, hole positions are determined and marked according to design requirements and surrounding rock conditions; after the drill hole is drilled in place, the anchor rod with the small guide pipe is driven in, and after the small guide pipe is driven in, the anchor rod unit is reversed to separate the small guide pipe from the anchor rod unit. The small guide pipe is constructed according to a method of firstly vaulting the arch and then arranging the two sides, grouting operation needs to be carried out in time after each small guide pipe is arranged, and the grouting support arrangement depth of the small guide pipes is designed according to the requirement of the primary support strength and is usually 3-5 m.
(6) Contaminated soil is vertically excavated, the contaminated soil in the longitudinal range of the subsurface excavation radius is excavated by adopting a long-arm excavator, a cutting edge is erected with a steel arch frame 5 to temporarily support each time a footage is completed in the excavation process, meanwhile, a vertical steel support 7 is arranged at the center of an excavation area and connected with the steel arch frame 5 to form an excavation area temporary middle support, and the support strength of the steel arch frame 5 is increased. The contaminated soil excavation footage length is determined according to geological conditions, and each footage length is 50-60 cm generally.
Specifically, as shown in fig. 3, during dredging, the deep contaminated soil is excavated from top to bottom by adopting an annular excavation reserved core soil method, a left partition 3 and a right partition 4 of an annular vault are excavated, core soil 2 is reserved, and then a lower step 1 is excavated. Directly loading excavated polluted soil to a temporary polluted soil storage yard near a working well, designing the temporary polluted soil storage yard to have a pile height of about 3m according to the daily soil output, stacking according to the gradient of 1:1, and adopting a 'one cloth one film' composite geomembrane structure, namely 1.0mm HDPE film +150g/m2The composite geomembrane of the non-woven geotextile is characterized in that when soil is piled, firstly, polluted soil of 30cm is paved and compacted above the composite geomembrane to be used as an isolating layer, and then, the polluted soil is piled and bagged.
As shown in fig. 4, the steel arch 5 is to be cleaned of the deficient slag and sundries on the sole of the steel arch before installation, the strike angle of the lock foot anchor pipe is to meet the requirement of design documents, and the steel arch 5 is installed from bottom to top in a segmented mode on the excavation boundary. The steel arch frame 5 is of a multi-section structure of U-shaped steel, and the sections are mechanically connected through fasteners 6, so that free combination can be achieved according to the longitudinal projection shape of the polluted area. The middle part of the excavated area is provided with a vertical steel support 7 which is connected with the steel arch frame 5 to be used as a temporary support, so that the strength of the steel arch frame 5 is improved, the top of the vertical steel support 7 is connected with the steel arch frame 5 by a fastener 6, and the bottom foundation of the vertical steel support 7 is connected with a square steel plate 8 with the thickness of 2cm by bolts, so that the excavation is convenient to disassemble; the strength of the vertical steel support 7 is determined by calculation according to the soil load and the strength of the steel arch frame 5.
(7) And (4) repairing the polluted soil, namely transporting the polluted soil dug out in the step (6) out of the working well, and performing ex-situ repair on the polluted soil.
Specifically, the polluted soil transferred to the temporary polluted soil storage yard is filled into a ton bag by an excavator, the ton bag is conveyed to the position under a grab bucket hanger of the working well by a forklift, the ton bag filled with the polluted soil is lifted to the temporary polluted soil storage yard on the ground by the grab bucket hanger, and the treatment is carried out by adopting a corresponding repairing technology. Considering the height of the transverse channel and the ventilation factor of the working well, the height of the polluted soil in the temporary soil storage yard of the working well is not more than 1/2 of the height of the transverse channel, and when the grab bucket crane lifts the polluted soil, workers cannot walk or mechanically construct around the periphery right below the polluted soil in the working well.
(8) And (4) backfilling clean soil, after the polluted soil is dug, backfilling and compacting the clean soil repaired in the step (7), and simultaneously, synchronously removing the steel arch frame and the vertical steel support in the backfilling process.
Specifically, the polluted soil within the determined range of the field adjustment is dug cleanly, the soil is filled into a ton bag again after being repaired in a corresponding workshop on the ground, the ton bag is sent back to the working well by a grab bucket, backfilling and compaction are carried out in a transverse channel until the backfilling of all the repaired soil is completed, meanwhile, in the soil backfilling process, when the soil is backfilled for a certain length, a section of temporary vertical steel support and a section of temporary steel arch frame are removed until all the soil is backfilled, the sealing is completed, and the original geological structure is restored.
And after the backfilling of the clean soil in the excavation range is finished and the opening is sealed, backfilling and compacting the soil temporarily piled up in the excavation of the working well, and then leveling the field.
In conclusion, the subsurface excavation remediation method for deep polluted soil provided by the invention adopts an underground subsurface excavation mode and combines the soil pollution range determined by the pollution distribution three-dimensional data simulation, carries out fixed-point excavation on the polluted soil, does not occupy the ground space, does not need to excavate soil which is not polluted on the ground surface, does not need to carry out large-scale support, saves the construction cost, reduces the environmental pollution such as atmosphere, sewage, noise and the like generated by openly excavating the polluted soil, and meets the requirements of human living environment.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims and any design similar or equivalent to the scope of the invention.
Claims (8)
1. An underground excavation repairing method for deep polluted soil is characterized by comprising the following steps:
1) investigating soil pollution distribution conditions and hydrogeological conditions of a construction site, and determining a working space required by construction;
2) performing three-dimensional data simulation according to the soil pollution distribution condition investigated in the step 1), and determining the soil pollution range and the pollution depth;
3) designing the depth and the plane size of the working well and the underground excavation radius of deep polluted soil according to the soil pollution range and the depth determined in the step 2);
4) excavating a working well to a designed depth outside the soil pollution range;
5) setting a small advanced guide pipe at the boundary of the longitudinal range of the polluted soil for grouting support by taking the determined underground excavation radius as a semicircle at the bottom of the working well;
6) the method comprises the following steps of 1, excavating polluted soil in a longitudinal range of an underground excavation radius by using an excavator, temporarily supporting an excavation boundary erection steel arch frame by completing one footage in an excavating process, and arranging a vertical steel support at the center of an excavation area to be connected with the steel arch frame to form an excavation area temporary middle support;
7) conveying the excavated polluted soil in the step 6) out of the working well, and performing ex-situ remediation on the polluted soil;
8) after the polluted soil is dug up, backfilling and compacting the clean soil repaired in the step 7), and simultaneously, synchronously removing the steel arch frame and the vertical steel support in the backfilling process.
2. The method for restoring the underground excavation of the deeply polluted soil according to claim 1, wherein the three-dimensional data simulation in the step 2) is implemented by three-dimensional modeling of survey data by using EVS and Arcgis software, and the spatial structure of the deeply polluted soil is analyzed in a multi-angle and multi-section manner.
3. The method for subsurface remediation for deeply contaminated soil according to claim 1 wherein the working well depth is 20cm below the soil contamination depth and the subsurface excavation radius for the deeply contaminated soil is the maximum of the longitudinal projection of the soil contamination range.
4. An underground excavation repairing method for deep polluted soil according to claim 1, wherein in the step 4), when the working well is excavated, a grid steel frame is erected and concrete is sprayed for each excavation footage, the operation is performed in a circulating manner, and each layer of footage is controlled within the range of 0.70-1.40 m.
5. An underground excavation remediation method for deeply contaminated soil according to claim 1 wherein the small pipe is drilled to a depth of 3 to 5 m.
6. The underground excavation remediation method for deep contaminated soil according to claim 1, wherein the contaminated soil in the step 6) is excavated by adopting a circular excavation reserved core soil method, and the excavation footage is 50-60 cm.
7. The subsurface excavation remediation method for deep contaminated soil according to claim 1, wherein the contaminated soil excavated in the step 7) is temporarily stockpiled in the working well, and is stockpiled with 1.0mm HDPE film +150g/m2And laying polluted soil of 30cm above the composite geomembrane of the non-woven geotextile, paving and compacting the polluted soil to form an isolation layer, and stacking the polluted soil.
8. An underground excavation remediation method for deep contaminated soil according to claim 1 wherein the steel arch is releasably connected to the vertical steel braces by fasteners and the bottoms of the vertical steel braces are bolted to the excavated bottom surface by square steel plates 2cm thick.
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| CN201911002913.6A CN110756570A (en) | 2019-10-22 | 2019-10-22 | Subsurface excavation remediation method for deep polluted soil |
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