CN116562654A - Land development and construction planning method based on soil environment restoration and protection - Google Patents
Land development and construction planning method based on soil environment restoration and protection Download PDFInfo
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- 238000013439 planning Methods 0.000 title claims abstract description 25
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/002—Reclamation of contaminated soil involving in-situ ground water treatment
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
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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
- E02D31/004—Sealing liners
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention relates to the technical field of polluted soil restoration management and control, in particular to a land development, construction and planning method based on soil environment restoration and protection, which comprises the following specific steps: performing field investigation and risk assessment on the land parcels; constructing a vertical blocking structure at the boundary of the red line of the site; performing pile foundation construction in the land according to the planning and design drawing; excavating and repairing the polluted soil above the elevation of the bottom plate of the foundation structure to be built; and performing barrier risk management and control on the polluted soil below the elevation of the bottom plate of the foundation structure to be built by using the horizontal barrier structure constructed in the field. The invention greatly shortens the construction period, reduces the engineering energy consumption and the engineering cost, promotes the updating and planning of cities and accelerates the circulation and the use of the land.
Description
Technical Field
The invention relates to the technical field of polluted soil restoration management and control, in particular to a land development, construction and planning method based on soil environment restoration and protection.
Background
In recent years, urban updating steps are performed, a large number of plots are investigated to have pollution conditions with different degrees, serious threats are generated on ecological environment and human health, land resource re-development and utilization are affected, and a series of development strategy plans such as urban updating are restricted.
According to the related survey reports, a large number of plots have the problems of large pollution area, complex pollution distribution, deeper pollution depth or difficult detection of the pollution depth to the bottom, high ground geological background value, urgent development and construction time and the like. Aiming at the problems, if the traditional repair modes of solidification stabilization, thermal desorption, chemical oxidation, cement kiln cooperative treatment, barrier landfill, risk management and control and the like are adopted, the defects are as follows: the repair construction period is longer and the cost is higher; the construction difficulty is high, and the construction safety risk is high; the reasons for exceeding the standard of the soil are closely related to regional geology, and the soil is difficult to repair thoroughly. However, a part of polluted sites cannot be repaired, developed and reused, and various influences on urban planning construction and the like are caused. In view of the above, the invention provides a land development and construction planning method based on soil environment restoration and protection.
Disclosure of Invention
In order to solve the problems of the existing soil remediation technology, the invention designs a land development and construction planning method based on soil environment remediation and protection, the land remediation is integrated into development and construction, synchronous design, synchronous construction and synchronous construction, the construction period is greatly shortened, engineering energy consumption and cost are reduced because contaminated soil is not required to be thoroughly remediated, urban updating planning is promoted, land circulation and use are accelerated, and the specific technical scheme is as follows:
the invention discloses a land development and construction planning method based on soil environment restoration and protection, which comprises the following steps:
s1, acquiring soil pollution data of a polluted land block, wherein the soil pollution data at least comprise soil pollution depth data, soil pollution area data and inflection point coordinate data of a polluted area;
s2, performing vertical barrier structure construction at the site red line boundary of the polluted land block;
s3, performing pile foundation construction at the corresponding position of the polluted land according to a land development and construction design drawing;
s4, excavating and repairing shallow polluted soil to be excavated due to underground infrastructure according to the land block development and construction design drawing; blocking risk management and control are carried out on deep polluted soil which does not need to be excavated, and migration, diffusion and exposure paths of pollutants are cut off;
s5, constructing an underground foundation structure according to a land development and construction design drawing, wherein the underground foundation structure at least comprises one or more of an elevator shaft, an oil separation tank, a septic tank and a building bearing platform;
s6, after the shallow polluted soil is excavated and repaired, and after the construction of the underground foundation structure is completed, horizontal barrier structure construction is carried out in the site red line boundary so as to control the exposure and diffusion of pollution.
Preferably, the S4 specifically includes: carrying out shallow soil dredging construction according to the land block development and construction design drawing, the design elevation of the underground foundation structure and the construction requirement, and repairing polluted soil generated in the process of dredging to the design elevation; the exposed deep polluted soil below the designed elevation is not excavated, meanwhile, anti-seepage concrete pouring construction and maintenance are adopted to form a blocking control surface, and then the construction of the underground foundation structure is carried out.
Preferably, the step S6 specifically includes: excavating an area with the original ground elevation higher than the design elevation of the horizontal control surface bottom plate on site, and excavating to the design elevation of the horizontal control surface bottom plate;
backfilling the area of which the original ground elevation is lower than the designed elevation of the horizontal control surface bottom plate on site by using clean soil, and compacting the backfill until the designed elevation of the horizontal control surface bottom plate is reached;
and after the ground elevation reaches the design elevation of the horizontal control surface bottom plate, carrying out horizontal blocking structure construction on the horizontal control surface bottom plate.
Preferably, the vertical blocking structure at least comprises a cement stirring pile, an HDPE impermeable film and bentonite, and the construction method of the vertical blocking structure comprises the following steps:
performing parallel double-row cement mixing pile construction along the site red line boundary to form a cement mixing pile wall;
and fixing the HDPE impermeable membrane on the inner side of the cement mixing pile near the red line boundary of the near-field ground, and filling and compacting the interval between the HDPE impermeable membrane and the other drainage mud mixing pile by using bentonite.
Furthermore, the depth of the cement stirring pile driven into the underground impermeable layer is more than or equal to 2m.
Preferably, the pile foundation adopts a non-soil-discharging type static pressure pile, and the non-soil-discharging type static pressure pile and the horizontal control surface are connected in a pouring mode to form a whole.
Further, shallow polluted soil generated by the construction and excavation of the underground foundation structure is transported to a soil pretreatment area, and the pretreated polluted soil is repaired and treated.
Furthermore, the barrier control surface is formed by casting impermeable concrete on the surface of the exposed deep polluted soil after dredging.
Furthermore, the slag stone with the length of more than 5cm generated after the pretreatment of the polluted soil is subjected to high-pressure flushing and repairing, the slag stone is used as a roadbed backfilling raw material after being detected to be qualified, and meanwhile, the wastewater generated in the high-pressure flushing process is treated and inspected to be qualified and then is recycled.
Further, the horizontal barrier structure at least comprises geotextile, HDPE impermeable film and concrete layer,
the construction method of the horizontal barrier structure comprises the following steps:
leveling the earth surface in the horizontal barrier risk management and control operation area, leveling and tamping the field by adopting a soil compactor, pouring concrete and curing to serve as a base layer, paving a first geotextile layer on the base layer, paving an HDPE impermeable film on the geotextile layer, paving a second geotextile layer on the HDPE impermeable film, and pouring concrete on the second geotextile layer.
Compared with the prior art, the invention has the beneficial effects that:
(1) The method has the advantages that the relation between soil remediation treatment and land development is reasonably integrated, soil remediation is integrated with land development and construction, synchronous design and synchronous construction are realized, the integrated mode of land remediation treatment and development and construction is realized, the earlier working time of land re-development and utilization for construction is effectively shortened, development timeliness is improved, planning and updating of cities are greatly promoted, circulation and use of land are quickened, and land resources are saved.
(2) Reasonable dredging and repairing are needed for land development, construction and design, excessive repairing is avoided, land safety utilization can be guaranteed, repeated earth excavation and deep foundation pit dredging and reinforcing cost in the implementation process are reduced, and soil repairing engineering investment is greatly saved.
(3) The method comprehensively considers regional conditions, economic influence and environmental effect while repairing and controlling pollution risks in soil and underground water, achieves the aim of maximizing the net benefit, realizes green sustainable repair of the polluted soil and accords with the aim of double carbon.
Drawings
The invention will be described in further detail with reference to the drawings and the detailed description.
Fig. 1 is a schematic view of a field plane of the present invention.
Fig. 2 is a schematic vertical cross-section of a field of the present invention.
FIG. 3 is a schematic view of a vertical barrier structure for a red line boundary of a field according to the present invention.
Fig. 4 is a schematic view of a field horizontal barrier structure of the present invention.
In the figure: 1. pile foundation; 2. a site red line; 3. cement stirring pile wall; 4. HDPE impermeable films; 5. bentonite; 6. deep heavy metal contaminated soil; 7. a concrete cushion layer; 8. an underground structure; 9. a concrete layer; 10. geotextile.
Detailed Description
The invention is further illustrated by the following description of specific embodiments, which are not intended to be limiting, and various modifications or improvements can be made by those skilled in the art in light of the basic idea of the invention, but are within the scope of the invention as long as they do not depart from the basic idea of the invention.
In order to actively explore a 'low-carbon high-efficiency' restoration technology, promote urban updating planning, accelerate land circulation and use, save land resources, comprehensively plan the relation between 'soil restoration treatment' and 'land development', the invention provides a land development and construction planning method based on soil environment restoration and protection.
Referring to fig. 1 to 4, an embodiment of the present invention is as follows:
the invention discloses a land development and construction planning method based on soil environment restoration and protection, which comprises the following steps:
s1, acquiring soil pollution data of a polluted land block, wherein the soil pollution data at least comprise soil pollution depth data, soil pollution area data and inflection point coordinate data of a polluted area;
s2, performing vertical barrier structure construction at the boundary of a site red line 2 of a polluted land block, and preventing the pollution in the land block from influencing the quality of soil and groundwater environment outside the land block through groundwater migration and diffusion; the vertical separation structure at least comprises a cement stirring pile, an HDPE impermeable film 4 and bentonite 5, and the construction method of the vertical separation structure comprises the following steps: performing parallel double-row cement mixing pile construction along the boundary of the site red line 2, setting a certain interval between the two rows of cement mixing piles, and driving the cement mixing piles into an underground impermeable layer to a depth of more than or equal to 2m to form a cement mixing pile wall 3; after the cement mixing pile construction is completed, the HDPE impermeable membrane 4 is fixed on the inner side of the cement mixing pile near the boundary of the near-field earth red line 2, and then the space between the HDPE impermeable membrane 4 and the other drainage mud mixing pile is filled and compacted by bentonite 5, so that the construction of the vertical barrier structure is completed.
S3, constructing a pile foundation 1 at the corresponding position of the polluted land according to the land development and construction design drawing; the pile foundation 1 adopts a non-soil-discharging type static pressure pile, so that disturbance to polluted soil is avoided, the non-soil-discharging type static pressure pile and a horizontal control surface are poured and connected to form a whole, and the pile foundation 1 is constructed before horizontal barrier structure construction in order to prevent the problems of subsequent control surface cracking and the like.
S4, excavating and repairing shallow polluted soil to be excavated due to underground infrastructure according to the land block development and construction design drawing; blocking risk management and control are carried out on deep polluted soil which does not need to be excavated, and migration, diffusion and exposure paths of pollutants are cut off;
s4 specifically comprises the following steps: carrying out shallow soil dredging construction according to a land block development and construction design drawing, the design elevation of an underground foundation structure and construction requirements, and repairing polluted soil generated in the process of dredging to the design elevation; the exposed deep polluted soil below the designed elevation is not excavated, meanwhile, anti-seepage concrete pouring construction and maintenance are adopted to form a blocking control surface, and then construction of an underground foundation structure is carried out; the barrier control surface is formed by casting impermeable concrete on the surface of the exposed deep polluted soil after dredging.
The specific treatment process of the polluted soil comprises the following steps: shallow polluted soil generated by the construction and excavation of an underground foundation structure is transported to a soil pretreatment area, pretreated polluted soil is repaired and treated, ironware such as steel bars and slag stones with the length of more than 5cm are removed, slag stones with the length of more than 5cm generated after the pretreatment of the polluted soil are subjected to high-pressure flushing and repairing, the slag stones with the length of more than 5cm are used as roadbed backfill raw materials after being detected to be qualified, and meanwhile, wastewater generated in the high-pressure flushing process is treated and inspected to be qualified and then recycled.
S5, constructing an underground foundation structure according to a land block development and construction design drawing, wherein the underground foundation structure at least comprises one or more of an elevator shaft, an oil separation tank, a septic tank and a building bearing platform;
s6, after the shallow polluted soil is excavated and repaired, and after the construction of the underground foundation structure is completed, horizontal barrier structure construction is carried out in the boundary of the site red line 2 so as to control the exposure and diffusion of pollution;
s6 specifically comprises the following steps: excavating an area with the original ground elevation higher than the design elevation of the horizontal control surface bottom plate on site, and excavating to the design elevation of the horizontal control surface bottom plate; backfilling the area of which the original ground elevation is lower than the designed elevation of the horizontal control surface bottom plate on site by using clean soil, and compacting the backfill until the designed elevation of the horizontal control surface bottom plate is reached; and after the ground elevation reaches the design elevation of the horizontal control surface bottom plate, carrying out horizontal blocking structure construction on the horizontal control surface bottom plate.
The horizontal barrier structure at least comprises geotextile 10, HDPE impermeable membrane 4 and concrete layer 9, and the construction method of the horizontal barrier structure comprises the following steps: leveling the earth surface in the horizontal barrier risk management and control operation area, leveling and tamping the field by adopting a soil compactor, pouring concrete and curing to serve as a base layer, paving a first geotextile layer 10 on the base layer, paving an HDPE impermeable film 4 on the geotextile layer 10, paving a second geotextile layer 10 on the HDPE impermeable film 4, pouring concrete on the second geotextile layer 10 and curing to finish the construction of the horizontal barrier structure.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention, and it is intended that the appended claims be interpreted as covering all equivalent modifications and variations as fall within the true spirit and scope of the invention.
Claims (10)
1. The land development and construction planning method based on soil environment restoration and protection is characterized by comprising the following steps of:
s1, acquiring soil pollution data of a polluted land block, wherein the soil pollution data at least comprise soil pollution depth data, soil pollution area data and inflection point coordinate data of a polluted area;
s2, performing vertical barrier structure construction at the site red line boundary of the polluted land block;
s3, performing pile foundation construction at the corresponding position of the polluted land according to a land development and construction design drawing;
s4, excavating and repairing shallow polluted soil to be excavated due to underground infrastructure according to the land block development and construction design drawing; blocking risk management and control are carried out on deep polluted soil which does not need to be excavated, and migration, diffusion and exposure paths of pollutants are cut off;
s5, constructing an underground foundation structure according to a land development and construction design drawing, wherein the underground foundation structure at least comprises one or more of an elevator shaft, an oil separation tank, a septic tank and a building bearing platform;
s6, after the shallow polluted soil is excavated and repaired, and after the construction of the underground foundation structure is completed, horizontal barrier structure construction is carried out in the site red line boundary so as to control the exposure and diffusion of pollution.
2. The land parcel development and construction planning method based on soil environment restoration and protection according to claim 1, wherein the S4 specifically comprises: carrying out shallow soil dredging construction according to the land block development and construction design drawing, the design elevation of the underground foundation structure and the construction requirement, and repairing polluted soil generated in the process of dredging to the design elevation; the exposed deep polluted soil below the designed elevation is not excavated, meanwhile, anti-seepage concrete pouring construction and maintenance are adopted to form a blocking control surface, and then the construction of the underground foundation structure is carried out.
3. The land parcel development and construction planning method based on soil environment restoration and protection according to claim 1, wherein the step S6 specifically comprises: excavating an area with the original ground elevation higher than the design elevation of the horizontal control surface bottom plate on site, and excavating to the design elevation of the horizontal control surface bottom plate;
backfilling the area of which the original ground elevation is lower than the designed elevation of the horizontal control surface bottom plate on site by using clean soil, and compacting the backfill until the designed elevation of the horizontal control surface bottom plate is reached;
and after the ground elevation reaches the design elevation of the horizontal control surface bottom plate, carrying out horizontal blocking structure construction on the horizontal control surface bottom plate.
4. The method for planning land development and construction based on soil environment restoration and protection according to claim 1, wherein the vertical barrier structure at least comprises cement stirring piles, HDPE impermeable films and bentonite, and the method for constructing the vertical barrier structure comprises the following steps:
performing parallel double-row cement mixing pile construction along the site red line boundary to form a cement mixing pile wall;
and fixing the HDPE impermeable membrane on the inner side of the cement mixing pile near the red line boundary of the near-field ground, and filling and compacting the interval between the HDPE impermeable membrane and the other drainage mud mixing pile by using bentonite.
5. The method for developing and planning land parcel based on soil environment restoration and protection according to claim 4, wherein the depth of the cement stirring pile driven into the underground impermeable layer is not less than 2m.
6. The land parcel development and construction planning method based on soil environment restoration and protection according to claim 1, wherein the pile foundation adopts a non-dumping type static pile, and the non-dumping type static pile and a horizontal control surface are connected in a pouring mode to form a whole.
7. The land parcel development and construction planning method based on the restoration and protection of the soil environment according to claim 2, wherein shallow polluted soil generated by the construction and excavation of the underground foundation structure is transported to a soil pretreatment area, and the pretreated polluted soil is restored and treated.
8. The land parcel development and construction planning method based on soil environment restoration and protection according to claim 2, wherein the blocking control surface is formed by casting impermeable concrete on the surface of exposed deep polluted soil after dredging.
9. The land development and construction planning method based on soil environment restoration and protection according to claim 7, wherein slag stone with the length of more than 5cm generated after the pretreatment of polluted soil is subjected to high-pressure flushing restoration, the slag stone is used as roadbed backfill raw material after being detected to be qualified, and meanwhile, wastewater generated in the high-pressure flushing process is treated and inspected to be qualified and then recycled.
10. The method for land development and construction planning based on soil environment restoration and protection according to claim 3, wherein said horizontal barrier structure at least comprises geotextile, HDPE impermeable film and concrete layer,
the construction method of the horizontal barrier structure comprises the following steps:
leveling the earth surface in the horizontal barrier risk management and control operation area, leveling and tamping the field by adopting a soil compactor, pouring concrete and curing to serve as a base layer, paving a first geotextile layer on the base layer, paving an HDPE impermeable film on the geotextile layer, paving a second geotextile layer on the HDPE impermeable film, and pouring concrete on the second geotextile layer.
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