CN110747839A - Construction method for backfilling on soft mud flat foundation - Google Patents
Construction method for backfilling on soft mud flat foundation Download PDFInfo
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- CN110747839A CN110747839A CN201910886594.3A CN201910886594A CN110747839A CN 110747839 A CN110747839 A CN 110747839A CN 201910886594 A CN201910886594 A CN 201910886594A CN 110747839 A CN110747839 A CN 110747839A
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- backfilling
- earthwork
- moso bamboo
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- mud
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/18—Making embankments, e.g. dikes, dams
-
- 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
- E02D19/02—Restraining of open water
- E02D19/04—Restraining of open water by coffer-dams, e.g. made of sheet piles
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a construction method for backfill on a soft beach foundation, and relates to the field of construction of beach foundations. When pond residues are backfilled on the mudflat, the actual backfilling earthwork amount is multiplied compared with the theoretical backfilling amount due to the silt squeezing effect in the earthwork backfilling process, and a large amount of sludge is generated and needs to be abandoned. The method comprises the following steps: 1) cofferdam is carried out on the construction mud flat, then accumulated water is drained, and surface layer floating mud is removed; 2) digging drainage open ditches in the filling area at equal intervals in the longitudinal direction and the transverse direction; 3) laying geotextile on the construction mudflat; 4) paving a moso bamboo strip grid on the geotextile, and firmly binding the moso bamboo strips; 5) paving a moso bamboo reinforcing net on the moso bamboo strip grids, and binding and fixing; 6) backfilling and paving earthwork on the moso bamboo reinforcing net layer by layer; 7) and (5) continuously backfilling earthwork according to the conventional earthwork construction principle. The method can effectively reduce a large amount of silt squeezing during backfilling earthwork at the later period, and solves the difficult problems of difficult backfilling construction due to low bearing capacity of the soft mud flat foundation.
Description
Technical Field
The invention relates to the field of construction of mudflat foundations, in particular to a construction method for backfill on a soft mudflat foundation.
Background
At present, electric power construction projects such as transformer substations in coastal areas are increasing day by day, but coastal areas, along rivers and along lakes are often widely distributed with wide soft beach foundations, deep soft soil layers are distributed below the soft beach foundations, and the soil layers have unfavorable engineering characteristics such as high water content, large pore ratio, poor permeability, high compressibility, low bearing capacity and the like. Meanwhile, as the engineering construction needs to be carried out on the beach to fill up the soil layer, the problems of walking of construction equipment and high ground cushion are solved.
If backfill pond residues are directly coated on the beach, on one hand, because the thickness of the sludge is large, the shearing strength is extremely low, the bearing capacity characteristic value is low, the machinery cannot walk in the backfill process, manual carrying is necessary, and the efficiency is low. On the other hand, after direct backfilling, rapid loading easily causes instability and damage of the foundation. In addition, the actual backfill earthwork amount is multiplied compared with the theoretical backfill amount due to the silt squeezing effect in the earthwork backfill process, a large amount of silt is generated and needs to be abandoned, the environment-friendly policy is not met, and the field construction management is difficult.
Therefore, the backfilling method which does not increase the backfilling volume and does not need to adopt foundation treatment on the mudflat in advance is important to find.
Disclosure of Invention
The technical problem to be solved and the technical task provided by the invention are to perfect and improve the prior technical scheme and provide a backfill construction method on the soft beach foundation so as to solve the problems of low bearing capacity of the soft beach foundation, difficult backfill construction and difficult control of backfill amount. Therefore, the invention adopts the following technical scheme.
A construction method for backfilling on a soft mud flat foundation comprises the following steps:
1) cofferdam is carried out on the construction mud flat, accumulated water is drained, and clean surface layer floating mud is removed;
2) excavating ditches in the field fill area at equal intervals in the longitudinal and transverse directions for dewatering and drainage so as to improve the bearing capacity of surface sludge;
3) laying geotextile on the construction mudflat;
4) criss-cross moso bamboo strip grids are laid on the geotextile, and the moso bamboo strips are firmly bound;
5) paving a moso bamboo reinforcing net on the criss-cross moso bamboo strip grids, and binding and fixing the moso bamboo reinforcing net and the moso bamboo strips to connect the moso bamboo reinforcing nets into sheets;
6) backfilling and paving earthwork on the moso bamboo reinforcing net layer by layer, and backfilling the earthwork from the middle to the periphery in sequence when backfilling the earthwork;
7) and (5) continuously backfilling earthwork according to the conventional earthwork construction principle.
The method can effectively reduce a large amount of squeezed silt during backfilling earthwork at the later stage, reduce the backfilling settlement of a silt layer, and the moso bamboo reinforcing nets connected into pieces can reduce the extrusion of the backfilled soil on the surface silt layer, so that the filling load is more uniformly distributed on the surface silt layer, and the problems of low bearing capacity of a soft mud flat foundation, difficult backfilling soil construction and difficult control of the backfilling amount are effectively solved.
As a preferable technical means: in the step 1), when the surface layer floating mud is removed, the surface layer floating mud is flushed into the groove by using a pressure water gun, then the surface floating mud is pumped to a transport ship by using a mud pump, and the floating mud is transported to a designated place to be stacked. The surface layer floating mud can not bear pressure, and the bearing capacity of the surface of the mud flat can be effectively improved by removing the layer floating mud.
As a preferable technical means: in the step 2), the distance between the open ditches is between 28 and 32m, and the width of the open ditches is between 0.8 and 1.2 m. The open trench spacing, the trench width and the trench depth need to be determined according to the actual conditions of a specific view field and the local precipitation conditions so as to facilitate drainage and effectively reduce the construction workload.
As a preferable technical means: in the step 3), the bursting strength of the geotextile is not less than 2.4kN/m2, the ladder-shaped tearing strength is not less than 0.45 kN/m2, the lapping length of the geotextile is more than 1000mm, and the lapping range adopts mechanical three-pass seaming. The pressure-bearing effect is good, and the personnel of also being convenient for carry out the construction on it.
As a preferable technical means: in the step 4), the moso bamboo strips are flat strips, and the moso bamboo strips are bound by iron wires. By adopting the flat strips, one moso bamboo can be cut into 3-5 strips, the material consumption is less, the cost is effectively reduced, the material transportation amount is reduced, and the iron wires are quickly and firmly bound.
As a preferable technical means: and 6), backfilling and layering compaction by using a small machine tool with small wheel pressure load when backfilling the earthwork. The bearing capacity of the moso bamboo reinforcing net is reduced without overload, machines are guaranteed not to sink, and effective construction is achieved.
As a preferable technical means: in the step 6), the thickness of the laid earthwork is between 0.9 and 1.1 m. The thickness can effectively realize the normal construction of the earthwork and is convenient for the walking of large-scale construction machines.
Has the advantages that: the extrusion silt in a large amount when can effectively reduce later stage backfill earthwork, reduce the backfill settlement volume on silt layer, and the moso bamboo reinforcing net that links into pieces has more reduced the extrusion of backfill soil to surface layer silt, makes the fill load distribute to surface layer silt more evenly, has solved because weak mud flat ground bearing capacity is low effectively, and the difficult problem that backfill construction difficulty and backfill volume are difficult to control, the follow-up walking construction of the large-scale construction equipment of being convenient for.
Drawings
FIG. 1 is a schematic diagram of the process steps of the present invention.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the drawings in the specification.
As shown in fig. 1, a construction method for backfill on a soft beach foundation comprises the following steps:
1) cofferdam is carried out on the construction mud flat, accumulated water is drained, and clean surface layer floating mud is removed;
2) excavating ditches in the field fill area at equal intervals in the longitudinal and transverse directions for dewatering and drainage so as to improve the bearing capacity of surface sludge;
3) laying geotextile on the construction mudflat;
4) criss-cross moso bamboo strips are laid on the geotextile, and the moso bamboo strips are firmly bound;
5) paving moso bamboo reinforcing nets on criss-cross moso bamboo strips, wherein each single moso bamboo reinforcing net is correspondingly paved with each moso bamboo strip grid, and the moso bamboo reinforcing nets and the moso bamboo strips are bound and fixed to enable the moso bamboo reinforcing nets to be connected into pieces;
6) backfilling and paving earthwork on the moso bamboo reinforcing net layer by layer, and backfilling the earthwork from the middle to the periphery in sequence when backfilling the earthwork;
7) and (5) continuously backfilling earthwork according to the conventional earthwork construction principle.
In order to improve the bearing capacity, in the step 1), when the surface floating mud is removed, the surface floating mud is flushed into the groove by using a pressure water gun, then the surface floating mud is pumped to a transport ship by using a mud pump, and the floating mud is transported to a designated place to be stacked. The surface layer floating mud can not bear pressure, and the bearing capacity of the surface of the mud flat can be effectively improved by removing the layer floating mud.
In order to drain rainwater conveniently, in the step 2), the distance between the open ditches is 30m, and the width of the open ditches is 1 m. The open trench spacing, the trench width and the trench depth need to be determined according to the actual conditions of a specific view field and the local precipitation conditions so as to facilitate drainage and effectively reduce the construction workload.
In order to obtain a better pressure-bearing effect, in the step 3), the bursting strength of the geotextile is not less than 2.4kN/m2, the ladder-shaped tearing strength is not less than 0.45 kN/m2, the lap-joint length of the geotextile is more than 1000mm, and the lap-joint range adopts three mechanical seams for seaming. The pressure-bearing effect is good, and the personnel of also being convenient for carry out the construction on it.
In order to reduce the cost, in the step 4), the moso bamboo strips are flat strips, and the moso bamboo strips are bound by iron wires. By adopting the flat strips, one moso bamboo can be cut into 3-5 strips, the material consumption is less, the cost is effectively reduced, the transportation quantity of the material is reduced, the construction is convenient, and the iron wire binding is fast and firm.
In order to ensure that the machines do not sink when backfilling the earthwork, in the step 6), the small machines with small wheel pressure load are adopted for backfilling and layered compaction when the earthwork is backfilled. The bearing capacity of the moso bamboo reinforcing net is reduced without overload, machines are guaranteed not to sink, and effective construction is achieved.
In order to facilitate the subsequent walking construction of large-scale construction equipment, in the step 6), the earthwork is paved according to the standard of 1 m. The thickness can effectively realize the normal construction of the earthwork and is convenient for the walking construction of large-scale construction machines.
The method can effectively reduce a large amount of squeezed silt during backfilling earthwork at the later stage, reduce the backfilling settlement of a silt layer, and the moso bamboo reinforcing nets connected into pieces can reduce the extrusion of the backfilled soil on the surface silt layer, so that the filling load is more uniformly distributed on the surface silt layer, and the problems of low bearing capacity of a soft mud flat foundation, difficult backfilling soil construction and difficult control of the backfilling amount are effectively solved.
In this example, the individual pieces of the bamboo reinforcing mesh were measured in a size of 1200mm × 1200 mm.
The construction method of backfill on the soft beach foundation shown in the figure 1 is a specific embodiment of the invention, has shown the outstanding substantive features and remarkable progress of the invention, and can carry out equivalent modification on the shape, the structure and the like according to the practical use requirements and under the inspiration of the invention, and the modification is in the scope of protection of the scheme.
Claims (7)
1. A construction method for backfilling on a soft mud flat foundation is characterized by comprising the following steps:
1) cofferdam is carried out on the construction mud flat, accumulated water is drained, and clean surface layer floating mud is removed;
2) excavating ditches in the field fill area at equal intervals in the longitudinal direction and the transverse direction for dewatering and drainage so as to improve the bearing capacity of surface sludge;
3) laying geotextile on the construction mudflat;
4) paving criss-cross moso bamboo strip grids on the geotextile, and firmly binding the moso bamboo strips to form a moso bamboo strip integral grid;
5) paving moso bamboo reinforcing nets on criss-cross moso bamboo strip grids, binding and fixing the moso bamboo strips, and connecting the moso bamboo reinforcing nets into sheets;
6) backfilling and paving earthwork on the moso bamboo reinforcing net layer by layer, and backfilling the earthwork from the middle to the periphery in sequence when backfilling the earthwork;
7) and (5) continuously backfilling earthwork according to the conventional earthwork construction principle.
2. The method for constructing backfill on a soft beach foundation according to claim 1, which is characterized in that: in the step 1), when the surface layer floating mud is removed, the surface layer floating mud is flushed into the groove by using a pressure water gun, then the surface floating mud is pumped to a transport ship by using a mud pump, and the floating mud is transported to a designated place to be stacked.
3. The method for constructing backfill on a soft beach foundation according to claim 1, which is characterized in that: in the step 2), the distance between the open ditches is between 28 and 32m, and the width of the open ditches is between 0.8 and 1.2 m.
4. The method for constructing backfill on a soft beach foundation according to claim 1, which is characterized in that: in the step 3), the bursting strength of the geotextile is not less than 2.4kN/m2, the ladder-shaped tearing strength is not less than 0.45 kN/m2, the lapping length of the geotextile is more than 1000mm, and the lapping range adopts mechanical three-pass seaming.
5. The method for constructing backfill on a soft beach foundation according to claim 1, which is characterized in that: in the step 4), the moso bamboo strips are flat strips, and the moso bamboo strips are bound by iron wires.
6. The method for constructing backfill on a soft beach foundation according to claim 1, which is characterized in that: and 6), backfilling and layering compaction by using a small machine tool with small wheel pressure load when backfilling the earthwork.
7. The method for constructing backfill on a soft beach foundation according to claim 1, which is characterized in that: in the step 6), the thickness of the laid earthwork is between 0.9 and 1.1 m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910886594.3A CN110747839A (en) | 2019-09-19 | 2019-09-19 | Construction method for backfilling on soft mud flat foundation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910886594.3A CN110747839A (en) | 2019-09-19 | 2019-09-19 | Construction method for backfilling on soft mud flat foundation |
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| CN110747839A true CN110747839A (en) | 2020-02-04 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114892682A (en) * | 2022-06-29 | 2022-08-12 | 中交广州航道局有限公司 | Construction process for preventing arch-silting in water environment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114892682A (en) * | 2022-06-29 | 2022-08-12 | 中交广州航道局有限公司 | Construction process for preventing arch-silting in water environment |
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Application publication date: 20200204 |