CN114351653A - Coastal hydraulic reclamation foundation and salt discharge method thereof - Google Patents
Coastal hydraulic reclamation foundation and salt discharge method thereof Download PDFInfo
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Abstract
The invention provides a coastal hydraulic fill foundation and a salt discharge method thereof, aiming at fundamentally solving the salt discharge problem of coastal hydraulic fill foundation soil and meeting the growth condition of plants on the coastal hydraulic fill foundation. The technical scheme of the invention for hydraulic filling of the coast into the foundation is as follows: a coastal hydraulic reclamation foundation comprises a block stone water-permeable arris body which is filled around a hydraulic reclamation area; the permeable geotextile covers the block stone permeable arris body; a clay mud cake layer which is filled on the coast ground of the hydraulic filling area; pores are formed among the clay cakes of the clay cake layers; fine joint filling sand laid on the clay mud cake layer; the joint filling fine sand is filled in the pore space through hydraulic power.
Description
Technical Field
The invention relates to the technical field of foundation treatment, in particular to a coastal hydraulic reclamation foundation and a salt discharge method thereof.
Background
The coastline of the coastal region of China is as long as 3.2 thousands of kilometers, which is a valuable ecological resource, and the past partial utilization modes of the coastline, such as buildings, fishery and the like, are environmental damages and resource waste of the coastline. The existing utilization mode proposed at present is to improve the original soil or dredger fill of the coastal zone so as to enable the coastal zone to be capable of planting 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 environment of the infiltrated seawater, has the characteristics of high salt content, strong alkalinity and poor air and water permeability, and not only needs sufficient and balanced nutrition supply but also needs the soil to have a well-coordinated physicochemical environment for the plant to grow if the plant can grow on the soil.
Most of the existing coastal area soil improvement and salt elimination technologies are that exogenous substances are added into soil or a biological improvement method is adopted, the former is doped with a large amount of exogenous substances and needs to be stirred uniformly, the cost is high, the operation is difficult, and the soil is easy to be alkalized; the latter has a long period and is difficult to improve the deep soil where the plant root system is located, so a method which has low cost and high efficiency and fundamentally enables the soil to automatically discharge salt for the plant growth is urgently needed.
Disclosure of Invention
The invention provides a coastal hydraulic fill foundation and a salt discharge method thereof, aiming at fundamentally solving the salt discharge problem of coastal hydraulic fill foundation soil and meeting the growth condition of plants on the coastal hydraulic fill foundation.
The technical scheme of the invention for hydraulic filling of the coast into the foundation is as follows:
a coastal hydraulic reclamation foundation comprises a block stone water-permeable arris body which is filled around a hydraulic reclamation area; the permeable geotextile covers the block stone permeable arris body; a clay mud cake layer which is filled on the coast ground of the hydraulic filling area; pores are formed among the clay cakes of the clay cake layers; fine joint filling sand laid on the clay mud cake layer; the joint filling fine sand is filled in the pore space through hydraulic power.
The invention relates to a coastal hydraulic fill foundation, which uses clay mud cakes as hydraulic fill materials on the coast. During the hydraulic filling process, the clay mud cakes can form pores which have three-dimensional spaces and are mutually communicated. After the gap filling fine sand is filled in the pores by depending on the flowing drag force of water flow, the coast blow-filling foundation has good water permeable effect, a sponge-type coast foundation capable of permeating and accumulating is formed, the coast soil quality is improved by the functions of percolation and salt washing, the water quality discharged into the sea is purified at the same time, and the environmental pollution of a coast zone is reduced. In addition, the permeable geotextile can prevent the fine sand for joint filling from flowing into the sea on one hand, and on the other hand, when the coastal hydraulic fill foundation is formed, fresh water such as surface water and rainfall poured on the clay mud cake layer can enter the sea through the permeable geotextile and take away the salinity in the clay mud cake layer, so that the coastal hydraulic fill foundation can reduce the salinity of a hydraulic fill area while preventing water and soil loss, and further improve the plant growth rate.
The coastal hydraulic fill foundation disclosed by the invention is simple to implement, short in construction period, economic and environment-friendly, small in slurry discharge amount during construction, and suitable for large-area popularization and application in muddy coastal zones.
Furthermore, in the coast hydraulic fill foundation, in order to better prevent water and soil loss, the permeable geotextile covers one side of the block stone permeable arris body close to the hydraulic fill area.
Further, in the coastal hydraulic reclamation foundation, the clay mud cakes are in the shape of lumps, the size is larger than 3cm, the liquid limit index is lower than 0.55, and the clay mud cakes are excavated from the seabed near a hydraulic reclamation area. The clay mud cake can be obtained by locally using materials of a cutter suction dredger and excavating the seabed near a hydraulic fill area, and the materials are locally used and the cost is low.
Further, in the coast 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 fill foundation, and hydraulic fill is respectively carried out. And after the clay mud cake layer is subjected to hydraulic filling to the designed elevation of the single layer, the hydraulic filling of the clay mud cake layer on the previous layer is carried out. In addition, after the blowing filling of each clay mud cake layer is finished, the laying of joint filling fine sand is needed, and the joint filling fine sand is poured by seawater at the moment and filled into the pores under the action of water power. Thereby ensuring that the joint filling fine sand can be fully filled.
The invention also provides a salt discharge method for the coastal hydraulic fill foundation, which adopts the technical scheme that the method comprises the following steps:
s1, determining a coastal hydraulic reclamation area, filling the block stone water-permeable prisms in a pile, enclosing the hydraulic reclamation area, and paving water-permeable geotextiles along the block stone water-permeable prisms;
s2, filling the clay mud cakes to a designed filling area by blowing to form a clay mud cake layer, and forming pores 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 the single-layer design elevation;
s4, continuously irrigating with infiltrated seawater to hydraulically fill the gap filling fine sand into the pores;
s5, repeating the steps S2-S4 until the clay mud cake layer reaches the total design elevation;
and S6, infiltrating fresh water into the clay mud cake layer, carrying out salinity away, and then infiltrating into the sea through the permeable geotextile.
The invention relates to a salt discharge method for a coastal hydraulic fill foundation, which uses a clay mud cake as a hydraulic fill soil material on the coast. During the hydraulic filling process, the clay mud cakes can form pores which have three-dimensional spaces and are mutually communicated. After the gap filling fine sand is filled in the pores by depending on the flowing drag force of water flow, the coast blow-filling foundation has good water permeable effect, a sponge-type coast foundation capable of permeating and accumulating is formed, the coast soil quality is improved by the functions of percolation and salt washing, the water quality discharged into the sea is purified at the same time, and the environmental pollution of a coast zone is reduced. In addition, the permeable geotextile can prevent the fine sand for joint filling from flowing into the sea on one hand, and on the other hand, when the coastal hydraulic fill foundation is formed, fresh water such as surface water and rainfall poured on the clay mud cake layer can enter the sea through the permeable geotextile and take away the salinity in the clay mud cake layer, so that the coastal hydraulic fill foundation can reduce the salinity of a hydraulic fill area while preventing water and soil loss, and further improve the plant growth rate.
The method for discharging the salt of the coastal hydraulic fill foundation is simple to implement, short in construction period, economical, environment-friendly, small in slurry discharge amount during construction, and suitable for large-area popularization and application in muddy coastal zones.
Further, in the method for removing salt from the coastal hydraulic fill foundation, in order to better prevent water and soil loss, in S1, the permeable geotextile covers the side of the block stone permeable arris body close to the hydraulic fill area. Namely, the permeable geotextile is laid along the slope surface of the inner side of the permeable block stone prism.
Further, in the method for removing salt from the coastal hydraulic fill foundation, in step S2, the clay mud cake is mined by a cutter suction dredger which is taken from the seabed near the hydraulic fill area, and the cutter suction dredger cuts the seabed clay into lumps to form the lumps of clay mud cake. By setting proper working parameters, the cutter suction dredger can cut seabed clay into blocky clay mud cakes, and the blocky clay mud cakes can more effectively form pores during hydraulic filling, so that the water permeability of a coastal hydraulic filling foundation is improved.
Further, in the method for removing salt from a coastal reclamation ground, in particular, in S2, the reclamation process is performed along the coast, and the reclamation process is performed by first reclamation on the side close to the coast and then gradually extended toward the sea side.
Further, in the method for removing salt from the coastal hydraulic fill foundation, in particular, in S2, after a clay cake layer reaches a single-layer design elevation of hydraulic fill at one hydraulic fill position, hydraulic fill at the next position is performed until hydraulic fill of a clay cake layer in the whole area is completed. The designed elevation of the single-layer clay mud cake layer is not too large, the thickness is controlled to be 1-2m reasonably, and 1.7m is better. The thickness of the joint filling fine sand is 0.3m, and when the single-layer clay mud cake layer reaches the design elevation, the pores are hydraulically filled with the joint filling fine sand as soon as possible.
Further, in the method for removing salt from the coastal hydraulic reclamation foundation, in order to improve the hydraulic reclamation efficiency, the hydraulic reclamation area is divided into a plurality of zones, and the step S5 is performed in each zone simultaneously.
Drawings
FIG. 1 is a schematic view of the construction of a coastal hydraulic reclamation foundation of the present invention;
FIG. 2 is a schematic view of the construction of another coastal hydraulic reclamation foundation of the present invention;
FIG. 3 is a schematic view showing the structure of a clay cake layer of a coastal hydraulic fill foundation according to the present invention;
fig. 4 is a schematic diagram of the process of forming a clay mud cake layer of a coastal hydraulic fill foundation of the present invention.
Detailed Description
The technical solution 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, a technical solution for seashore hydraulic reclamation foundation of this embodiment is as follows:
a coastal hydraulic reclamation foundation comprises block stone water-permeable prisms 8 which are piled up around a hydraulic reclamation area; a permeable geotextile 10 covering the block stone permeable arris body 8; a clay mud cake layer 2 which is filled on the coast ground 9 of the hydraulic filling area; pores 23 are formed among the clay cakes 22 of the clay cake layer 2; joint filling fine sand 1 laid on the clay mud cake layer 2; the caulking fine sand 1 is hydraulically filled in the pores 23.
A coastal reclamation foundation of this embodiment uses a clay mud cake 22 as the reclamation material on the coast. During the hydraulic filling process, the clay cake 22 can form pores 23 which have three-dimensional spaces and are communicated with each other. After the gap filling fine sand 1 is filled in the holes 23 by depending on the flowing drag force of water flow, the coast blow-filling foundation has good water permeable function, a sponge-type coast foundation capable of permeating and accumulating is formed, the coast soil quality is improved by the functions of percolation and salt washing, the water quality discharged into the sea is purified at the same time, and the environmental pollution of a coast zone is reduced. In addition, the permeable geotextile 10 can prevent the fine joint filling sand 1 from flowing into the sea on one hand, and on the other hand, when the coastal hydraulic fill foundation is formed, fresh water poured on the clay mud cake layer 2, such as surface water and rainfall, can enter the sea through the permeable geotextile 10 and take away the salinity in the clay mud cake layer 2, so that the coastal hydraulic fill foundation can reduce the salinity in a hydraulic fill area while preventing water and soil loss, and further improve the growth rate of the plants 7.
The coastal hydraulic fill foundation of the embodiment is simple to implement, short in engineering period, economic and environment-friendly, small in slurry discharge amount during construction, and suitable for large-area popularization and application in muddy coastal zones.
Referring to fig. 1, in the coastal hydraulic fill foundation, in order to better prevent water and soil loss, the permeable geotextile 10 covers the side of the block stone permeable arris body 8 close to the hydraulic fill area.
In a preferred embodiment, the coastal hydraulic fill foundation is constructed such that the clay cake 22 is in the form of lumps having a size greater than 3cm and a liquid limit index less than 0.55 and is excavated from the seafloor near the hydraulic fill area. The clay mud cake 22 can be obtained by using a cutter suction dredger which is obtained by excavating the seabed near a hydraulic fill area, and is obtained by using local materials and low in cost.
Referring to fig. 2, in the coast reclamation foundation, the clay mud cake layer 2 is divided into a plurality of layers in a preferred embodiment. 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 fill foundation, and hydraulic fill is respectively carried out. And after the clay mud cake layer 2 is filled to the designed elevation of the single layer, the clay mud cake layer 2 on the upper layer is filled. In addition, after the blowing filling of each clay mud cake layer 2 is completed, the fine joint filling sand 1 needs to be laid, and the fine joint filling sand 1 is poured by seawater at the moment and is filled into the pores 23 under the action of water power. Thereby ensuring that the joint filling fine sand 1 can be fully filled.
Example 2:
referring to fig. 1 to 4, the present embodiment provides a method for discharging salt from a coastal hydraulic fill foundation, which includes the following steps:
s1, determining a coastal hydraulic reclamation area, filling the block stone water-permeable prisms 8, enclosing the hydraulic reclamation area, and paving the water-permeable geotextile 10 along the block stone water-permeable prisms 8;
s2, blow-filling the clay mud cake 22 to a designed blow-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 the single-layer design elevation;
s4, continuously irrigating with infiltrated seawater 5 to hydraulically fill the gap 23 with gap filling fine sand 1;
s5, repeating the steps S2-S4 until the clay mud cake layer 2 reaches the total design elevation;
s6, enabling the infiltration fresh water 6 to seep into the clay mud cake layer 2, carrying away salt, and then flowing into the sea through the permeable geotextile 10.
In the method for discharging salt in the coastal hydraulic fill foundation of the embodiment, the clay mud cake 22 is used as a hydraulic fill soil material on the coast. During the hydraulic filling process, the clay cake 22 can form pores 23 which have three-dimensional spaces and are communicated with each other. After the gap filling fine sand 1 is filled in the holes 23 by depending on the flowing drag force of water flow, the coast blow-filling foundation has good water permeable function, a sponge-type coast foundation capable of permeating and accumulating is formed, the coast soil quality is improved by the functions of percolation and salt washing, the water quality discharged into the sea is purified at the same time, and the environmental pollution of a coast zone is reduced. In addition, the permeable geotextile 10 can prevent the fine joint filling sand 1 from flowing into the sea on one hand, and on the other hand, when the coastal hydraulic fill foundation is formed, fresh water poured on the clay mud cake layer 2, such as surface water and rainfall, can enter the sea through the permeable geotextile 10 and take away the salinity in the clay mud cake layer 2, so that the coastal hydraulic fill foundation can reduce the salinity in a hydraulic fill area while preventing water and soil loss, and further improve the growth rate of the plants 7.
The method for discharging the salt of the coastal hydraulic fill foundation is simple to implement, short in construction period, economical, environment-friendly, small in slurry discharge amount during construction, and suitable for large-area popularization and application in muddy coastal zones.
Referring to fig. 2, in order to better prevent water and soil loss in the method for removing salt from a hydraulic fill foundation on a coast, as a preferred embodiment, the permeable geotextile 10 is covered on one side of the water-permeable rock ridge 8 close to the hydraulic fill area in S1. Namely, the permeable geotextile is laid along the slope surface of the inner side of the block stone permeable arris body 8.
In the method for removing salt from the coastal dredger fill foundation, in S2, the clay cake 22 is mined by a cutter suction dredger which is taken from the seabed near the dredger fill area, and the cutter suction dredger cuts the seabed clay into lumps to form the lump clay cake 22. By setting proper working parameters, the cutter suction dredger can cut the seabed clay into the lumpy clay mud cakes 22, and the lumpy clay mud cakes 22 can more effectively form pores 23 during hydraulic filling, so that the water permeability of the coastal hydraulic filling foundation is improved.
Referring to fig. 2, in the method for discharging salt on the coast by hydraulic fill foundation, in particular, in S2, the hydraulic fill process is performed along the coast, and the hydraulic fill is performed first on the side of the shore 12 and then gradually extended to the side of the sea 11.
In the method for discharging salt from the coastal hydraulic fill foundation, in particular, in S2, after the clay mud cake layer 2 reaches the designed elevation of the single layer of hydraulic fill at one hydraulic fill position, the hydraulic fill at the next position is performed until the hydraulic fill of one clay mud cake layer 2 in the whole area is completed. The designed elevation of the single-layer clay mud cake layer 2 is not too large, the thickness is reasonably controlled to be 1-2m, and 1.7m is better. The joint filling fine sand 1 is 0.3m thick, and when the single-layer clay mud cake layer 2 reaches the design elevation, the pore 23 should be hydraulically filled with the joint filling fine sand 1 as soon as possible.
In the method for discharging salt on the coast to fill the foundation, in order to improve the filling efficiency, the filling area is divided into a plurality of zones, and the step S5 is performed in each zone simultaneously.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments 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 fill foundation, comprising:
a block stone water-permeable prism (8) which is filled around the hydraulic filling area;
a permeable geotextile (10) covering the block stone permeable arris body (8);
a clay mud cake layer (2) which is hydraulically filled on the coastal ground (9) of the hydraulic filling area; pores (23) are arranged among the clay cakes (22) of the clay cake layer (2);
fine joint filling sand (1) laid on the clay mud cake layer (2); the joint filling fine sand (1) is filled in the pore space (23) through hydraulic power.
2. A coastal hydraulic fill foundation according to claim 1, wherein said water permeable geotextile (10) covers the side of the block stone water permeable arris body (8) close to the hydraulic fill area.
3. A coastal hydraulic reclamation foundation as set forth in claim 1 wherein said clay cake (22) is in the form of lumps having a size greater than 3cm and a liquid limit index less than 0.55 and is excavated from the seafloor adjacent to the hydraulic reclamation area.
4. A coastal hydraulic foundation according to claim 1, wherein said clay-cake layer (2) is a multilayer.
5. A method for discharging salt from a coastal hydraulic fill foundation is characterized by comprising the following steps:
s1, determining a coastal hydraulic reclamation area, filling the block stone water-permeable prisms (8), enclosing the hydraulic reclamation area, and paving water-permeable geotextiles (10) along the block stone water-permeable prisms (8);
s2, blowing and filling the clay mud cake (22) to a designed blow filling area to form a clay mud cake layer (2), and forming pores (23) in the clay mud cake layer (2);
s3, paving fine joint filling sand (1) on the clay mud cake layer (2) after the clay mud cake layer (2) reaches the single-layer design elevation;
s4, continuously irrigating with infiltrated seawater (5) to enable the gap filling fine sand (1) to be hydraulically filled 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) flows into the clay mud cake layer (2) in an infiltration mode, and flows into the sea through the permeable geotextile (10) after salt is taken away.
6. The method for removing salts from a coastal hydraulic fill foundation as claimed in claim 5, wherein in S1, the permeable geotextile (10) is covered on the side of the block stone permeable arris body (8) close to the hydraulic fill area.
7. The method for discharging salt on the coastal dredger fill foundation according to claim 5, wherein in S2, the clay mud cake (22) is mined by a cutter suction dredger taken from the seabed near the dredger fill area, and the cutter suction dredger cuts the seabed clay into lumps to form the lump clay mud cake (22).
8. The method for discharging salt on the coast reclamation ground as claimed in claim 5, wherein the reclamation process is performed along the coast at S2, and the reclamation process is performed by first reclamation on the side of the coast (12) and then gradually extended toward the side of the sea (11).
9. The method for discharging salt on the coast land reclamation ground according to claim 5, wherein in S2, after the clay mud cake layer (2) reaches the designed elevation of the single layer of the land reclamation at one land reclamation position, the land reclamation at the next position is carried out until the land reclamation of one clay mud cake layer (2) in the whole area is completed.
10. The method for discharging salt on the coast land reclamation according to claim 5, wherein the land reclamation area is divided into a plurality of subareas, and the step S5 is simultaneously performed in each subarea.
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Cited By (1)
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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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