CN114351653B - Coastal hydraulic filling foundation and salt removing method thereof - Google Patents
Coastal hydraulic filling foundation and salt removing method thereof Download PDFInfo
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- CN114351653B CN114351653B CN202210104232.6A CN202210104232A CN114351653B CN 114351653 B CN114351653 B CN 114351653B CN 202210104232 A CN202210104232 A CN 202210104232A CN 114351653 B CN114351653 B CN 114351653B
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Abstract
In order to fundamentally solve the problem of salt elimination of the soil of the coastal hydraulic filling foundation and meet the condition that plants grow on the coastal hydraulic filling foundation, the invention provides the coastal hydraulic filling foundation and a salt elimination method thereof. The technical scheme of the coastal hydraulic reclamation foundation is as follows: a coastal hydraulic reclamation foundation comprises a block stone permeable prism body piled up around a hydraulic reclamation area; a permeable geotextile covering the permeable ribs of the stone block; a clay mud cake layer hydraulically filled on the coastal ground of the hydraulic filling area; the clay mud cakes of the clay mud cake layer are provided with pores; joint filling fine sand paved on the clay mud cake layer; the fine sand is filled in the pores by hydraulic force.
Description
Technical Field
The invention relates to the technical field of foundation treatment, in particular to a coastal hydraulic reclamation foundation and a salt removal method thereof.
Background
The coastline in the coastal area of China is 3.2 ten thousand kilometers or more, which is a precious ecological resource, and the past partial utilization mode of the coastal zone, such as construction, fishery and the like, is environmental damage and resource waste of the coastal zone. The most proposed utilization mode nowadays is to improve the original soil or dredger fill of the coastal zone so that the coastal zone can be planted with landscape plants, and on the premise, how to overcome the high salt content of the soil is one of the very important problems. The coastal dredger fill is affected by the seawater infiltration environment, has the characteristics of high salt content, strong alkalinity and poor ventilation and water permeability, and if plants can grow on the soil, not only is sufficient and balanced nutrition supply needed, but also the soil is required to have a well-coordinated physicochemical environment for plant growth.
The existing coastal area soil improvement and salt removal technology mostly adopts a method of adding exogenous substances into soil or adopting biological improvement, wherein the exogenous substances are mixed uniformly, the cost is high, the operation is difficult, and the soil is easy to alkalize; the latter has a long period and is difficult to improve the deep soil where the plant root system is located, so a method for automatically discharging salt from the soil for plant growth with low cost and high efficiency is needed.
Disclosure of Invention
In order to fundamentally solve the problem of salt elimination of the soil of the coastal hydraulic filling foundation and meet the condition that plants grow on the coastal hydraulic filling foundation, the invention provides the coastal hydraulic filling foundation and a salt elimination method thereof.
The technical scheme of the coastal hydraulic reclamation foundation is as follows:
a coastal hydraulic reclamation foundation comprises a block stone permeable prism body piled up around a hydraulic reclamation area; a permeable geotextile covering the permeable ribs of the stone block; a clay mud cake layer hydraulically filled on the coastal ground of the hydraulic filling area; the clay mud cakes of the clay mud cake layer are provided with pores; joint filling fine sand paved on the clay mud cake layer; the fine sand is filled in the pores by hydraulic force.
The invention relates to a coastal hydraulic reclamation foundation, which uses clay mud cakes as hydraulic reclamation materials on the coast. In the hydraulic filling process, clay mud cakes can form pores which have three-dimensional space and are communicated with each other. After the fine sand for filling gaps is filled in the pores by means of the flow drag force of water flow, the coastal hydraulic filling foundation has good water permeability, a permeable and accumulated sponge coastal foundation is formed, the coastal soil quality is improved by percolation and salt washing, the water quality discharged into the sea is purified, and the environmental pollution of coastal zones is reduced. In addition, the permeable geotextile can prevent fine sand from filling gaps from flowing into the sea, and on the other hand, when the coastal hydraulic filling foundation is formed, fresh water such as surface water and rainfall irrigated on the clay mud cake layer can enter the sea through the permeable geotextile and take away salt in the clay mud cake layer, so that the coastal hydraulic filling foundation can reduce the salinity of a hydraulic filling area while preventing water and soil loss, and further the plant growth rate is improved.
The coastal hydraulic filling foundation disclosed by the invention is simple to implement, short in engineering period, economical and environment-friendly, small in mud discharge during construction, and suitable for large-area popularization and application in a muddy coastal zone.
Furthermore, in the coastal hydraulic reclamation foundation, in order to better prevent water and soil loss, the permeable geotextile covers one side of the block stone permeable prism close to the hydraulic reclamation area.
Further, in the coastal hydraulic reclamation foundation, the clay mud cake is in a lump shape, the size is more than 3cm, the liquid limit index is lower than 0.55, and the clay mud cake is obtained by excavating from the seabed near the hydraulic reclamation area. The clay mud cake can be obtained by locally taking materials through a cutter suction dredger and excavating the seabed near a hydraulic filling area, and the locally taking materials are low in cost.
Further, in the coastal hydraulic reclamation foundation, the clay mud cake layer is divided into a plurality of layers. In order to facilitate construction, the clay mud cake layer can be divided into a plurality of layers in the construction process of the coastal hydraulic reclamation foundation, and hydraulic reclamation is respectively carried out. And after the clay mud cake layer is hydraulically filled to the single-layer design elevation, the hydraulic filling of the clay mud cake layer on the upper layer is performed. In addition, after the hydraulic filling of each clay mud cake layer is completed, the fine sand for filling is paved, and then the fine sand for filling is poured with seawater, and the fine sand for filling is filled into the pores under the action of water power. Thereby ensuring that the caulking fine sand can be fully filled.
The invention also provides a salt discharging method of the coastal hydraulic reclamation foundation, which comprises the following steps:
s1, determining a coastal hydraulic filling area, stacking block stone permeable prisms, enclosing the hydraulic filling area, and paving permeable geotextiles along the block stone permeable prisms;
s2, the clay mud cake is filled into a designed filling area in a blowing mode to form a clay mud cake layer, and pores are formed in the clay mud cake layer;
s3, paving joint filling fine sand on the clay mud cake layer after the clay mud cake layer reaches a single-layer design elevation;
s4, continuously irrigating with the infiltrated seawater to hydraulically fill the fine sand into the pores;
s5, repeating the steps S2-S4 until the clay mud cake layer reaches the total design elevation;
s6, the infiltrated fresh water infiltrates into the clay mud cake layer, takes salt away, and flows into the sea through the permeable geotextile.
The invention relates to a salt discharging method for a coastal hydraulic reclamation foundation, which uses clay mud cakes as hydraulic reclamation materials on the coast. In the hydraulic filling process, clay mud cakes can form pores which have three-dimensional space and are communicated with each other. After the fine sand for filling gaps is filled in the pores by means of the flow drag force of water flow, the coastal hydraulic filling foundation has good water permeability, a permeable and accumulated sponge coastal foundation is formed, the coastal soil quality is improved by percolation and salt washing, the water quality discharged into the sea is purified, and the environmental pollution of coastal zones is reduced. In addition, the permeable geotextile can prevent fine sand from filling gaps from flowing into the sea, and on the other hand, when the coastal hydraulic filling foundation is formed, fresh water such as surface water and rainfall irrigated on the clay mud cake layer can enter the sea through the permeable geotextile and take away salt in the clay mud cake layer, so that the coastal hydraulic filling foundation can reduce the salinity of a hydraulic filling area while preventing water and soil loss, and further the plant growth rate is improved.
The salt removing method for the coastal hydraulic filling foundation is simple to implement, short in engineering period, economical and environment-friendly, small in mud discharge during construction, and suitable for large-area popularization and application in a muddy coastal zone.
Further, in the salt removing method of the coastal hydraulic reclamation foundation, in order to better prevent water and soil loss, in S1, the permeable geotextile is covered on one side of the block permeable prism close to the hydraulic reclamation area. The permeable geotextile is paved along the inner side slope of the permeable edge body of the stone block.
In the salt removing method of the coastal hydraulic reclamation foundation, in S2, the clay mud cake is mined by a cutter suction dredger, is taken from the seabed near the hydraulic reclamation area, and is cut into a block shape by the cutter suction dredger to form the block-shaped clay mud cake. By setting proper working parameters, the cutter suction dredger can cut the seabed clay into a block-shaped clay mud cake, and the block-shaped clay mud cake can form pores more effectively during hydraulic filling, so that the water permeability of a coastal hydraulic filling foundation is improved.
Further, in the salt removing method of the coastal hydraulic filling foundation, specifically, in S2, the hydraulic filling process is performed along the coast, and the hydraulic filling process is performed on the coast side first, and then gradually extends to the sea side.
In the salt removing method of the coastal hydraulic reclamation foundation, in particular, in S2, after a hydraulic reclamation position reaches a single-layer design elevation of hydraulic reclamation, hydraulic reclamation is performed at the next position until hydraulic reclamation of a layer of clay mud cake layer in the whole area is completed. The design elevation of the single clay mud cake layer is not too large, the thickness is reasonably controlled to be 1-2m, and preferably 1.7 m. The fine sand for filling the gaps is 0.3m thick, and the holes are filled with the fine sand for filling the gaps hydraulically as soon as possible after the single clay mud cake layer reaches the designed elevation.
In the salt removing method of the coastal hydraulic reclamation foundation, in order to improve hydraulic reclamation efficiency, the hydraulic reclamation area is divided into a plurality of subareas, and the S5 is performed in each subarea at the same time.
Drawings
FIG. 1 is a schematic view of a construction of a coastal hydraulic reclamation foundation according to the present invention;
FIG. 2 is a schematic view of another construction of a coastal hydraulic reclamation foundation according to the present invention;
FIG. 3 is a schematic view of a construction of a clay cake layer of a coastal hydraulically filled foundation of the present invention;
FIG. 4 is a schematic diagram showing a process of forming a clay cake layer of a coastal hydraulically filled foundation according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Example 1:
referring to fig. 1 and 3, the technical scheme of the coastal hydraulic reclamation foundation according to the present embodiment is as follows:
a coastal hydraulic reclamation foundation comprises a block stone permeable prism 8 piled up around a hydraulic reclamation area; a water-permeable geotextile 10 covering the block stone water-permeable prisms 8; a clay mud cake layer 2 filled on the coastal ground 9 of the filling area; the pores 23 are arranged between the clay cakes 22 of the clay cake layer 2; the fine caulking sand 1 is paved on the clay mud cake layer 2; the caulking fine sand 1 is filled in the pores 23 by hydraulic force.
In the present embodiment, a coastal reclamation foundation is constructed using a clay cake 22 as a reclamation material on the coast. During the blow-fill process, the clay cake 22 can form pores 23 having a three-dimensional space and communicating with each other. After the gap filling fine sand 1 is filled in the pores 23 by means of the flow drag force of water flow, the coastal hydraulic filling foundation has good water permeability, a permeable and accumulated sponge coastal foundation is formed, the coastal soil quality is improved by percolation and salt washing, the water quality discharged into the sea is purified, and the environmental pollution of a coastal zone is reduced. In addition, the permeable geotextile 10 can prevent the fine sand 1 from flowing into the sea, on the one hand, when the coastal hydraulic filling foundation is formed, fresh water such as surface water and rainfall irrigated on the clay mud cake layer 2 can enter the sea through the permeable geotextile 10 and take away salt in the clay mud cake layer 2, so that the coastal hydraulic filling foundation can prevent water and soil loss, and simultaneously reduce the salinity of the hydraulic filling area, and further improve the growth rate of plants 7.
The coastal hydraulic reclamation foundation is simple to implement, short in engineering period, economical, environment-friendly, small in mud discharge during construction and suitable for large-area popularization and application in a muddy coastal zone.
Referring to fig. 1, in a preferred embodiment, in the hydraulic reclamation of the coastal reclamation foundation, in order to better prevent water and soil loss, the water permeable geotextile 10 is covered on one side of the block permeable prism 8 close to the reclamation area.
In a preferred embodiment, the clay cake 22 is in the form of a block with a size greater than 3cm and a liquid limit index less than 0.55, and is excavated from the sea floor in the vicinity of the blow-fill area. The clay mud cake 22 can be obtained by locally taking materials through a cutter suction dredger and excavating the seabed near a hydraulic filling area, and the locally taking materials are low in cost.
Referring to fig. 2, in the dredger fill foundation of the coast, the clay cake layer 2 is divided into a plurality of layers. In order to facilitate construction, the clay mud cake layer 2 can be divided into a plurality of layers in the construction process of the coastal hydraulic reclamation foundation, and hydraulic reclamation is respectively carried out. And after the clay mud cake layer 2 is hydraulically filled to the single-layer design elevation, the hydraulic filling of the clay mud cake layer 2 on the upper layer is performed. In addition, after the completion of the hydraulic filling of each clay cake layer 2, the laying of the fine sand 1 is required, and at this time, the fine sand 1 is filled with seawater, and the pores 23 are filled with water. Thereby ensuring that the caulking sand 1 is sufficiently filled.
Example 2:
referring to fig. 1 to 4, the present embodiment provides a salt discharging method for a coastal hydraulic reclamation foundation, which comprises the following steps:
s1, determining a coastal hydraulic filling area, stacking a block stone permeable prism 8, enclosing the hydraulic filling area, and paving permeable geotextile 10 along the block stone permeable prism 8;
s2, the clay mud cake 22 is hydraulically filled into a designed hydraulic filling area to form a clay mud cake layer 2, and pores 23 are formed in the clay mud cake layer 2;
s3, after the clay mud cake layer 2 reaches the single-layer design elevation, paving joint filling fine sand 1 on the clay mud cake layer 2;
s4, continuously irrigating with the infiltrated seawater 5 to enable the fine sand 1 to be filled into the holes 23 hydraulically;
s5, repeating the steps S2-S4 until the clay mud cake layer 2 reaches the total design elevation;
s6, the infiltrated fresh water 6 infiltrates into the clay mud cake layer 2, takes salt away, and flows into the sea through the permeable geotextile 10.
In the salt removing method of the coastal hydraulic reclamation foundation of the embodiment, the clay mud cake 22 is used as the hydraulic reclamation material on the coast. During the blow-fill process, the clay cake 22 can form pores 23 having a three-dimensional space and communicating with each other. After the gap filling fine sand 1 is filled in the pores 23 by means of the flow drag force of water flow, the coastal hydraulic filling foundation has good water permeability, a permeable and accumulated sponge coastal foundation is formed, the coastal soil quality is improved by percolation and salt washing, the water quality discharged into the sea is purified, and the environmental pollution of a coastal zone is reduced. In addition, the permeable geotextile 10 can prevent the fine sand 1 from flowing into the sea, on the one hand, when the coastal hydraulic filling foundation is formed, fresh water such as surface water and rainfall irrigated on the clay mud cake layer 2 can enter the sea through the permeable geotextile 10 and take away salt in the clay mud cake layer 2, so that the coastal hydraulic filling foundation can prevent water and soil loss, and simultaneously reduce the salinity of the hydraulic filling area, and further improve the growth rate of plants 7.
The salt removing method for the coastal hydraulic filling foundation is simple to implement, short in engineering construction period, economical, environment-friendly, small in mud discharge during construction and suitable for large-area popularization and application in a muddy coastal zone.
Referring to fig. 2, in a salt removing method of a coastal hydraulic reclamation foundation, in order to better prevent water and soil loss, S1, the water permeable geotechnical cloth 10 is covered on one side of the block stone water permeable prism 8 close to the hydraulic reclamation area. I.e. laying water permeable geotextile along the inner slope of the stone permeable prism 8.
In a preferred embodiment, in S2, the clay mud cake 22 is mined by a cutter suction dredger, and is taken from the sea floor near the hydraulic reclamation area, and the cutter suction dredger cuts the sea floor clay into a block shape to form the clay mud cake 22 in the block shape. By setting proper working parameters, the cutter suction dredger can cut the seabed clay into a block-shaped clay mud cake 22, and the block-shaped clay mud cake 22 can form pores 23 more effectively during hydraulic filling, so that the water permeability of a coastal hydraulic filling foundation is improved.
Referring to fig. 2, in a salt discharging method of a coastal hydraulic reclamation foundation, specifically, in S2, the hydraulic reclamation process is performed along the coast, and the hydraulic reclamation process is performed to the side of the coast 12 first and then gradually extends to the side of the sea 11.
In the salt removing method of the coastal hydraulic reclamation foundation, in particular, in S2, after the clay mud cake layer 2 reaches the single-layer design elevation of hydraulic reclamation at one hydraulic reclamation position, hydraulic reclamation is performed at the next position until the hydraulic reclamation of one layer of clay mud cake layer 2 in the whole area is completed. The design elevation of the single clay mud cake layer 2 is not too large, the thickness is reasonably controlled to be 1-2m, and preferably 1.7 m. The caulking fine sand 1 is 0.3m thick, and the pore 23 should be filled with the caulking fine sand 1 hydraulically as soon as the single clay mud cake layer 2 reaches the designed elevation.
In a preferred embodiment, in the salt removing method for a coastal hydraulic reclamation foundation, in order to improve hydraulic reclamation efficiency, a hydraulic reclamation area is divided into a plurality of sections, and the step S5 is performed simultaneously in each section.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A coastal hydraulic reclamation foundation, comprising:
a block stone permeable prism (8) piled up around the hydraulic filling area;
a permeable geotextile (10) covering the stone permeable prism (8);
a clay mud cake layer (2) filled on the coastal ground (9) of the filling area; a pore (23) is formed between clay cakes (22) of the clay cake layer (2);
the fine joint filling sand (1) is paved on the clay mud cake layer (2); the fine caulking sand (1) is filled in the pores (23) by hydraulic force.
2. A coastal reclamation foundation according to claim 1, wherein the water-permeable geotextile (10) covers the side of the block stone water-permeable prism (8) close to the reclamation area.
3. A coastal hydraulic reclamation foundation according to claim 1, wherein the clay mud cake (22) is in the form of a briquette with a size of more than 3cm and a liquid limit index of less than 0.55, and is excavated from the sea floor in the vicinity of the hydraulic reclamation area.
4. A coastal hydraulic reclamation foundation according to claim 1, the clay cake layer (2) being a plurality of layers.
5. The salt removing method for the coastal hydraulic reclamation foundation is characterized by comprising the following steps of:
s1, determining a coastal hydraulic filling area, stacking block stone permeable prisms (8), enclosing the hydraulic filling area, and paving permeable geotextiles (10) along the block stone permeable prisms (8);
s2, blowing and filling the clay mud cake (22) to a designed blowing and filling area to form a clay mud cake layer (2), and forming pores (23) in the clay mud cake layer (2);
s3, paving joint filling fine sand (1) on the clay mud cake layer (2) after the clay mud cake layer (2) reaches a single-layer design elevation;
s4, continuously irrigating with the infiltration seawater (5) to hydraulically fill the gap filling fine sand (1) into the pores (23);
s5, repeating the steps S2-S4 until the clay mud cake layer (2) reaches the total design elevation;
s6, the infiltration fresh water (6) infiltrates into the clay mud cake layer (2), takes salt away, and flows into the sea through the permeable geotextile (10).
6. The salt elimination method of coastal hydraulic reclamation foundation according to claim 5, wherein in S1, the water permeable geotextile (10) is covered on one side of the block stone water permeable prism (8) close to the hydraulic reclamation area.
7. A method for salt elimination of a coastal hydraulic reclamation foundation according to claim 5, characterized in that in S2, the clay cake (22) is mined by a cutter suction dredger, which cuts the seabed clay into a lump from the seabed in the vicinity of the hydraulic reclamation area, forming a lump-shaped clay cake (22).
8. The method for discharging salt of a coastal hydraulic reclamation foundation according to claim 5, wherein in S2 the hydraulic reclamation process is performed along the coast and is performed to first hydraulic reclamation of the coast (12) side and then to gradually extend to the sea (11) side.
9. The salt elimination method of a coastal hydraulic reclamation foundation according to claim 5, wherein in S2, after the clay mud cake layer (2) reaches the single-layer design elevation of hydraulic reclamation at one hydraulic reclamation position, hydraulic reclamation is performed at the next position until the hydraulic reclamation of one clay mud cake layer (2) in the whole area is completed.
10. The method for salt elimination of a coastal hydraulic reclamation foundation according to claim 5, wherein the hydraulic reclamation area is divided into a plurality of subareas, and the S5 is performed simultaneously in each subarea.
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| CN202210104232.6A CN114351653B (en) | 2022-01-28 | 2022-01-28 | Coastal hydraulic filling foundation and salt removing method thereof |
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| CN202210104232.6A CN114351653B (en) | 2022-01-28 | 2022-01-28 | Coastal hydraulic filling foundation and salt removing method thereof |
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| CN114351653B true CN114351653B (en) | 2023-06-27 |
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| CN116267075A (en) * | 2023-02-24 | 2023-06-23 | 中国长江三峡集团有限公司 | Quick salt eluting system before planting green in estuary sand-blowing dyke sand soil |
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| CN104846787B (en) * | 2015-04-01 | 2016-10-05 | 广西建工集团第五建筑工程有限责任公司 | Construction method for carrying out sand-blowing sea-filling land-making in shallow sea area by using cutter suction dredger |
| RU2661950C1 (en) * | 2017-04-03 | 2018-07-23 | Виктор Сергеевич Федотенко | Hydraulic fill re-laying method |
| CN207017219U (en) * | 2017-07-17 | 2018-02-16 | 黄河三角洲建设工程有限公司 | A kind of new embankment |
| CN209806388U (en) * | 2019-03-04 | 2019-12-20 | 江苏禾吉新材料科技有限公司 | Organic salt reducing structure suitable for well-hydraulically-filled salinized soil |
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