CN114775620A - Construction method for progressive excavation of plain river basin under mucky soil condition - Google Patents

Construction method for progressive excavation of plain river basin under mucky soil condition Download PDF

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CN114775620A
CN114775620A CN202210510812.5A CN202210510812A CN114775620A CN 114775620 A CN114775620 A CN 114775620A CN 202210510812 A CN202210510812 A CN 202210510812A CN 114775620 A CN114775620 A CN 114775620A
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excavation
road
basin
construction
area
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CN114775620B (en
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王聪
叶阳
杨航
邹顺清
张哲�
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Wuhan University WHU
Sinohydro Bureau 7 Co Ltd
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Sinohydro Bureau 7 Co Ltd
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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
    • 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
    • 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
    • E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F5/00—Sewerage structures
    • E03F5/04—Gullies inlets, road sinks, floor drains with or without odour seals or sediment traps
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F5/00—Sewerage structures
    • E03F5/10—Collecting-tanks; Equalising-tanks for regulating the run-off; Laying-up basins

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Hydrology & Water Resources (AREA)
  • Structural Engineering (AREA)
  • Paleontology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
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  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
  • Sewage (AREA)

Abstract

本发明公开了一种淤泥质土条件下平原临河库盆递进开挖的施工方法，包括：在坝脚处打入一圈连续搅拌桩；将水库分为四个大区域，在主干道的两侧开挖主排水沟；利用库盆区表层渣土，铺设临时施工道路，并将路面压实，同时在临时施工道路外侧开挖次排水沟；将每个小区域分成许多条带区域，从每个大区域最外侧的小区域开始进行条带开挖；最外侧条带开挖完成后，进行下一个小区域条带的开挖，依次递进开挖到库盆中心；进行临时施工道路和主干道的开挖。本发明从周围往中心递进式分区开挖，未开挖的淤泥质土固结有利于施工车辆和人工入内进行中心区域的开挖施工。并且采用流水施工的施工方法，可同时进行，有效缩短施工工期。

Figure 202210510812

The invention discloses a construction method for progressive excavation of a basin near a river in a plain under the condition of silty soil, comprising: driving a circle of continuous stirring piles at the foot of the dam; dividing the reservoir into four large areas; The main drainage ditch is excavated on both sides; the surface muck in the reservoir basin area is used to lay a temporary construction road, and the road surface is compacted, and at the same time, the secondary drainage ditch is excavated on the outside of the temporary construction road; each small area is divided into many strip areas, Start strip excavation from the outermost small area of each large area; after the outermost strip excavation is completed, carry out the excavation of the next small area strip, and excavate progressively to the center of the reservoir basin; carry out temporary construction Excavation of roads and main roads. The present invention excavates progressively from the surrounding to the center, and the consolidation of the uncoiled silty soil is beneficial to the excavation of the central area by construction vehicles and manual entry. And the construction method of flowing water construction can be carried out at the same time, effectively shortening the construction period.

Figure 202210510812

Description

Construction method for progressive excavation of plain river basin under mucky soil condition
Technical Field
The invention relates to the technical field of civil engineering, in particular to a construction method for progressive excavation of a plain river basin under a mucky soil condition.
Background
In the aspect of physical characteristics, the silt soft soil has the characteristics of large natural water content, large pore proportion, high compressibility level, low permeability and low load strength, and has the characteristics of larger thixotropy, rheological property, nonuniformity, low water permeability and the like in the aspect of engineering construction.
In the process of excavating the basin in the river bank in plain, the construction problems caused by mucky soil are particularly serious, and the external factors such as construction progress, vibration, pile loading on the top of a pit, soil mass weight increment after rain, high underground water level near a river and the like have great influence on the construction of the mucky soft soil foundation.
The excavation of the basin of the riverside reservoir on the plain has the above difficulties. Conventional earth excavation methods cannot be employed. And the conventional earthwork excavation causes disturbance of soil body, so that a construction vehicle is not smooth to operate, and even construction equipment is damaged. The treatment of the mucky soil foundation is based on the physical and mechanical properties of the mucky soil. The depth of a buried layer, the height of an embankment and the situation of a material field are respectively treated by taking measures of soil replacement, stone throwing and silt squeezing, back pressure protection of a road, water seepage, upper construction materials, a plastic drainage plate, a powder spraying pile, a gravel pile, overload prepressing and the like. However, these operations are very complicated, difficult to construct, costly and time consuming.
Disclosure of Invention
The invention aims to provide a construction method for progressive excavation of a basin of a river reservoir in plain under the condition of mucky soil, and aims to solve the technical problems of complex operation, difficult construction, higher cost and long time consumption of the existing excavation method for earthwork in the mucky soil foundation.
In order to realize the purpose, the invention adopts the following technical scheme:
a construction method for progressive excavation of a plain river basin under mucky soil conditions comprises the following steps:
step 1, driving a circle of continuous stirring piles at the position of a peripheral dam foot in a reservoir basin to serve as a waterproof curtain;
step 2, dividing the whole warehouse basin into a plurality of large areas, enabling each large area to be adjacent to a main trunk of the warehouse basin, and excavating main drainage ditches on two sides of the main trunk of the warehouse basin;
step 3, paving a temporary construction road by utilizing the surface layer muck of the reservoir basin, compacting the road surface, excavating a secondary drainage ditch on the outer side of the temporary construction road, wherein the temporary construction road passes through all large areas to form a closed loop, and the temporary construction road is paved from the middle part of the reservoir basin to the outside so as to solve the problem that less soil is accumulated in the initial construction stage, and adjacent temporary construction roads can be communicated;
step 4, after the temporary construction road is paved by half, secondary drainage ditches are dug on the outer side of the temporary construction road from inside to outside, at the road intersection, the main drainage ditches and the secondary drainage ditches penetrate through the road intersection in a mode of pipe burying below, and adjacent secondary drainage ditches are communicated and are finally communicated with the main drainage ditches;
step 5, dividing an area between adjacent temporary construction roads into small areas, dividing each small area into a plurality of small strips, connecting one end of each strip with the temporary construction roads and the other end of each strip with a secondary drainage ditch, excavating from the strips of the small area at the outermost side of each large area, and excavating the strips at the outermost side of the large areas at the same time;
step 6, after the excavation of the small area on the outermost side is finished, the construction vehicle excavates the next small area through the temporary construction road and excavates the small areas to the center of the warehouse basin in sequence;
and 7, excavating the temporary construction road and the main road, and excavating the temporary construction road and the main road.
The construction method for progressive excavation of the plain river basin under the condition of mucky soil comprises the following steps of:
step 601, excavating in a small area on the outermost side in a strip mode, and reserving a temporary construction road in the excavating process;
and step 602, after the strip of the small area is excavated, excavating the temporary construction road at the strip.
According to the construction method for progressive excavation of the plain river-facing reservoir basin under the condition of mucky soil, two crossed trunk roads are arranged in the reservoir basin area, and the whole reservoir basin is divided into four large areas by the reservoir basin area trunk roads.
In the construction method for the progressive excavation of the basin of the plain river reservoir under the mucky soil condition, the closed loop is triangular, and the triangular closed loop at the center takes the main road as the bottom edge.
According to the construction method for the progressive excavation of the plain river basin under the mucky soil condition, the distance between adjacent temporary construction roads is 50-70 m.
According to the construction method for the progressive excavation of the basin of the plain river reservoir under the mucky soil condition, the vertexes of the closed-loop triangles are sequentially communicated through the temporary construction road from inside to outside. Or the side edge of the inner closed-loop triangle is vertically connected with the other side edge of the adjacent closed-loop triangle.
The construction method for the progressive excavation of the plain river basin under the condition of mucky soil further comprises water collecting wells, 1-3 water collecting wells are excavated in each secondary drainage ditch, the water overflows to the secondary drainage ditches after being filled with water, the peripheries of the water collecting wells are protected, and warning marks are arranged.
According to the construction method for progressive excavation of the plain river basin under the condition of mucky soil, the main drainage ditch is discharged outside through the drainage outlet.
The construction method for the progressive excavation of the plain river basin under the condition of mucky soil comprises the steps of grading excavated soil, carrying out mucky soil treatment, and filling hard muck to level a main drainage ditch, a secondary drainage ditch and a water collection well.
According to the construction method for progressive excavation of the plain river basin under the condition of mucky soil, a circle of main drainage ditch is excavated in the adjacent continuous stirring pile at one side of the continuous stirring pile, which is far away from a river.
In the step 6, after the excavation of the small region on the outermost side is completed, a secondary drainage ditch is reserved and communicated with the main drainage ditch on the outermost side and the secondary drainage ditch on the inner side.
The construction method for progressive excavation of the plain river reservoir basin under the mucky soil condition is applied to excavation of a mucky soil layer.
The beneficial effects of the invention are: the construction method adopts a mode of excavating from outside to inside by dividing the muddy reservoir basin into a large area, a small area and a strip, and the consolidation of the unearthed muddy soil is beneficial to construction vehicles and manual working for excavating construction of a central area, and basically no disturbance is formed on the muddy soil; and a plurality of large areas are excavated simultaneously, and the problems of long construction period and inconvenient operation of construction machinery in the excavation of the silt texture library basin are effectively solved by adopting a construction method of flow construction.
Drawings
FIG. 1 is a schematic diagram of a construction process of the progressive excavation construction method of the plain river basin under the mucky soil condition.
FIG. 2 is a schematic diagram of steps 1 to 3.
Fig. 3 is a schematic diagram of the outermost small area strip excavation by selecting the area C.
Fig. 4 is a schematic diagram of the outermost small area strip of fig. 3 after excavation.
In the figure, 1, river; 2. continuously stirring the piles; 3. a main drainage ditch; 4. a trunk road; 5. temporarily constructing a road; 6. a secondary drainage ditch; 7. a strip.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the embodiments of the present invention are not limited to the examples.
Example 1
A construction method for progressive excavation of a plain river basin under mucky soil conditions comprises the following steps:
step 1, driving a circle of continuous stirring piles 2 along the peripheral dam feet in a reservoir basin to serve as a waterproof curtain;
step 2, dividing the whole reservoir basin into a plurality of large areas, enabling each large area to be adjacent to a reservoir basin main trunk 4, and excavating main drainage ditches 3 on two sides of the reservoir basin main trunk 4;
step 3, paving a temporary construction road 5 by utilizing the surface layer muck of the basin area of the reservoir, compacting the pavement, excavating a secondary drainage ditch 6 at the outer side of the temporary construction road 5, wherein the temporary construction road 5 passes through all large areas to form a closed loop, the temporary construction road 5 is paved from the middle part of the basin of the reservoir to the outside so as to overcome the problem that less soil is accumulated at the initial construction stage, and the adjacent temporary construction roads 5 can be communicated; step 4, after the temporary construction road 5 is paved by a half, excavating a secondary drainage ditch 6 on the outer side of the temporary construction road 5 from inside to outside, wherein at the road intersection, the main drainage ditch 3 and the secondary drainage ditch 6 penetrate through in a mode of burying pipes below, and the adjacent secondary drainage ditches 6 are communicated and are finally communicated with the main drainage ditch 3;
step 5, dividing each small area into a plurality of small strips 7, connecting one end of each strip 7 with the temporary construction road 5, connecting the other end of each strip 7 with a secondary drainage ditch 6, excavating from the strip 7 of the outermost small area of each large area, and excavating the outermost strips 7 of the plurality of large areas at the same time;
step 6, after the excavation of the outermost small area is finished, the construction vehicle excavates the next small area through the temporary construction road 5 and excavates the small areas to the center of the warehouse basin in sequence;
and 7, excavating the temporary construction road 5 and the main road 4, and excavating the temporary construction road 5 and the main road 4.
Example 2
Based on the embodiment 1, the embodiment 2 lists a plurality of new technical features, and the embodiment 1 can be combined with the technical features alternatively or in a plurality, thereby forming a plurality of new and different technical schemes.
Further, the construction method for progressive excavation of the plain river basin under the mucky soil condition includes the following steps:
601, excavating the strips 7 in the area, and reserving a temporary construction road 5 in the excavation process;
and step 602, after the strip 7 in the area is excavated, excavating the temporary construction road 5 at the strip 7.
Optionally, in the construction method for progressively excavating the basin of the plain river reservoir under the mucky soil condition, two crossed main roads 4 exist in the reservoir basin region, and the whole reservoir basin is divided into four large areas by the reservoir basin region main road 4.
Preferably, in the construction method for progressively excavating the flatland riverside basin under the mucky soil condition, the closed loop is triangular, and the central triangular closed loop takes the adjacent main road 4 as the bottom edge.
Preferably, in the construction method for progressively excavating the basin in the plain river bank under the mucky soil condition, the distance between the adjacent temporary construction roads 5 is 50-70 m.
Preferably, in the construction method for progressive excavation of the plain river basin under the condition of mucky soil, the vertexes of the closed-loop triangle are sequentially communicated through the temporary construction road 5 from inside to outside. Or the side edge of the inner closed-loop triangle is vertically connected with the other side edge of the adjacent closed-loop triangle.
Further, in the step 6, after the excavation of the small region at the outermost side is completed, a secondary drainage ditch 6 is reserved and communicated with the main drainage ditch 3 at the outermost side and the secondary drainage ditch 6 at the inner side.
Further, the construction method for progressive excavation of the plain river basin under the condition of mucky soil further comprises water collecting wells, 1-3 water collecting wells are excavated in each secondary drainage ditch 6, the water overflows to the secondary drainage ditch 6 after being full of water, and the peripheries of the water collecting wells are enclosed and provided with warning marks.
Further, in the construction method for progressive excavation of the plain river basin under the condition of mucky soil, the main drainage ditch 3 is discharged outside through the drainage port.
Further, the construction method for the progressive excavation of the basin of the plain river reservoir under the mucky soil condition comprises the steps of grading excavated soil, carrying out mucky soil treatment and filling hard muck to level the main drainage ditch 3, the secondary drainage ditch 6 and the water collection well.
The construction method for progressive excavation of the plain river reservoir basin under the condition of mucky soil is applied to excavation of mucky soil layers.
Example 3
A construction method for the progressive excavation of a plain river basin under the condition of mucky soil comprises the following steps,
step 1, driving a circle of continuous stirring piles 2 into a basin of a river 1 along the peripheral dam feet to serve as a waterproof curtain;
step 2, dividing the whole reservoir into A, B, C, D four large areas by taking two crossed main roads 4 as dividing lines, and excavating main drainage ditches 3 on two sides of the main roads 4 in the reservoir basin area;
step 3, paving a temporary construction road 5 by utilizing the surface layer muck of the reservoir basin area, compacting the road surface, and excavating a secondary drainage ditch 6 on the outer side of the temporary construction road 5;
step 4, the area between the adjacent temporary construction roads 5 is small area, each small area is divided into a plurality of strip-shaped strips 7 by taking 60m width as a unit, strip excavation is carried out from the strip 7 of the small area at the outermost side of each large area, and the excavation of the four large areas is carried out simultaneously;
step 5, after the excavation of the outermost small area is finished, the construction vehicle excavates the next small area through the temporary construction road 5 and excavates the small areas to the center of the warehouse basin in sequence;
and 6, excavating the temporary construction road 5 and the main road 4.
For: step 1, driving a circle of continuous stirring piles 2 along the peripheral dam feet in a reservoir basin to serve as a waterproof curtain;
1. floor cleaning
Farmlands in the excavated areas of the warehouse basin are densely distributed, mainly including sugarcane fields and banana fields, and local parts of the farmlands include fish ponds and small rivers. The resident houses are basically gathered on both sides of the inland river and the rest houses are scattered in the dike. Before excavation, vegetation, construction waste and the like in an excavated area need to be cleaned, and conditions are created for warehouse basin excavation engineering.
2. Pile for continuous stirring
A row of continuous stirring piles 2 are driven into the dam feet at the periphery of the reservoir basin to form a waterproof curtain, so that underground water is prevented from permeating into a dam foundation, and consolidation of silt soil in the reservoir basin area during excavation is facilitated.
Step 2, dividing the whole reservoir into four large areas, and excavating main drainage ditches 3 on two sides of a main trunk road 4 in a reservoir basin area;
1. a circle of main drainage ditch 3 is arranged at a distance of 5m from a dam foot line, and the section of the main drainage ditch 3 is 2m multiplied by 1.5 m;
2. the main drainage ditch 3 is discharged outside by using a river surge drainage outlet.
3. The sump pit arranges along inferior escape canal 6, and every 6 nearby 1 ~ 2 sump pits that set up in inferior escape canal, overflow to inferior escape canal 6 after water is full. Meanwhile, in order to ensure safety, a movable iron horse is used for enclosing the periphery of the water collecting well and a related warning mark is set.
4. DN600 concrete pipes are pre-buried before construction of the temporary construction road 5 newly built in the basin and the cross drainage ditch of the proposed road.
Step 3, paving a temporary construction road 5 by utilizing the residue soil on the surface layer of the reservoir basin area, compacting the road surface, and excavating a secondary drainage ditch 6 on the outer side of the temporary construction road 5:
step 4, dividing each small area into a plurality of strip-shaped strips 7 by taking 60m as a unit, excavating the strips 7 from the small area at the outermost side of each large area, and excavating the four large areas simultaneously:
excavating the strips 7 in a small area, and reserving the temporary construction roads 5 of the strips 7 in the excavation process; after the excavation of the strip 7 in the area is completed, the temporary construction road 5 in the strip 7 is excavated.
Step 5, after the excavation of the peripheral small area is finished, the construction vehicle excavates the next small area through the temporary construction road 5, and excavates the center of the warehouse basin progressively in sequence:
after the consolidation of the soil of the excavation area of the outermost small area is completed, a construction vehicle enters the temporary construction road 5 of the warehousing basin area to perform excavation of the next small area;
step 6, excavating the temporary construction road 5 and the main road 4;
and (5) excavating a temporary construction road 5 and a main road 4 to finish the excavation construction of the whole warehouse basin.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to those skilled in the art without departing from the principles of the present invention should also be considered as within the scope of the present invention.

Claims (10)

1.一种淤泥质土条件下平原临河库盆递进开挖的施工方法，其特征在于，所述方法包括以下步骤：1. a construction method for progressive excavation of a plain adjacent to a river basin under a silty soil condition, is characterized in that, described method may further comprise the steps: 步骤1，在库盆内沿周边坝脚处打入一圈连续搅拌桩，充当止水帷幕；Step 1, drive a circle of continuous stirring piles in the reservoir basin along the surrounding dam toe to act as a water-stop curtain; 步骤2，将整个库盆分成若干大区域，使每个大区域都能邻接库盆区主干道，在库盆区主干道的两侧开挖主排水沟；Step 2: Divide the entire reservoir basin into several large areas, so that each large area can be adjacent to the main road in the reservoir basin area, and excavate main drainage ditches on both sides of the main road in the reservoir basin area; 步骤3，利用库盆区表层渣土，铺设临时施工道路，并将路面压实，同时在临时施工道路外侧开挖次排水沟，临时施工道路要穿越所有大区域并形成闭环，临时施工道路从库盆中部往外铺设，以克服施工初期积累泥土较少的问题，相邻的临时施工道路能连通；Step 3: Use the surface muck in the reservoir basin to lay temporary construction roads and compact the road surface. At the same time, a secondary drainage ditch is excavated on the outside of the temporary construction road. The temporary construction road must pass through all large areas and form a closed loop. The middle part of the reservoir basin is laid out to overcome the problem of less soil accumulation in the early stage of construction, and the adjacent temporary construction roads can be connected; 步骤4，临时施工道路铺设完成一半后，从内到外在临时施工道路外侧开挖次排水沟，在道路交叉处，主排水沟和次排水沟采用下方埋管的方式穿过，相邻的次排水沟连通并最终与主排水沟连通；Step 4: After half of the temporary construction road is laid, the secondary drainage ditch is excavated from the inside to the outside. The secondary drain communicates and eventually communicates with the primary drain; 步骤5，相邻临时施工道路之间的区域为小区域，将每个小区域分成若干小型条带，该条带一端连接临时施工道路，另一端连接次排水沟，从每个大区域的最外侧小区域的条带开挖，若干大区域最外侧条带的开挖同时进行；Step 5, the area between adjacent temporary construction roads is a small area, each small area is divided into several small strips, one end of the strip is connected to the temporary construction road, and the other end is connected to the secondary drainage ditch, from the most of each large area. The strip excavation in the outer small area, and the excavation of the outermost strip in several large areas are carried out at the same time; 步骤6，最外侧小区域开挖完成以后，施工车辆通过临时施工道路进行下一个小区域的开挖，依次递进开挖到库盆中心；Step 6: After the excavation of the outermost small area is completed, the construction vehicle will carry out the excavation of the next small area through the temporary construction road, and then progressively excavate to the center of the reservoir basin; 步骤7，进行临时施工道路和主干道的开挖，将临时施工道路和主干道均挖掉。Step 7, excavate the temporary construction road and the main road, and excavate the temporary construction road and the main road. 2.根据权利要求1所述的一种淤泥质土条件下平原临河库盆递进开挖的施工方法，其特征在于，所述步骤6，进一步包括：2. the construction method of the progressive excavation of the plain adjacent to the river basin under a kind of silty soil condition according to claim 1, is characterized in that, described step 6, further comprises: 步骤601，在最外侧小区域内分条带开挖，开挖过程中预留临时施工道路；Step 601, excavate in strips in the outermost small area, and reserve a temporary construction road during the excavation process; 步骤602，等该小区域的条带开挖完成以后，进行该条带处临时施工道路的开挖。Step 602: After the strip excavation of the small area is completed, excavate the temporary construction road at the strip. 3.根据权利要求1所述的一种淤泥质土条件下平原临河库盆递进开挖的施工方法，其特征在于，库盆区主干道有交叉的两条，库盆区主干道将整个库盆分成四个大区域。3. the construction method of the progressive excavation of the plain adjacent to the reservoir basin under a kind of silty soil condition according to claim 1, it is characterized in that, the main road in the reservoir basin area has two intersecting, and the main road in the reservoir basin area will be the whole. The library basin is divided into four large areas. 4.根据权利要求1所述的一种淤泥质土条件下平原临河库盆递进开挖的施工方法，其特征在于，所述步骤3中闭环为三角形，且中心的三角形闭环以主干道为底边。4. the construction method of the progressive excavation of the plain adjacent to the river basin under a kind of silty soil condition according to claim 1, it is characterized in that, in described step 3, the closed loop is a triangle, and the triangle closed loop in the center takes the main road as the main road. bottom edge. 5.根据权利要求4所述的一种淤泥质土条件下平原临河库盆递进开挖的施工方法，其特征在于，从内到外，闭环三角形的顶点通过临时施工道路依次连通。5 . The construction method for progressive excavation of a plain adjacent to a river basin under a silty soil condition according to claim 4 , wherein, from the inside to the outside, the vertices of the closed-loop triangle are sequentially connected through temporary construction roads. 6 . 6.根据权利要求4所述的一种淤泥质土条件下平原临河库盆递进开挖的施工方法，其特征在于，内侧闭环三角形的侧边与相邻闭环三角形的另一侧边垂直连接。6. the construction method of the progressive excavation of the plain river basin under a kind of silty soil condition according to claim 4, it is characterized in that, the side of the inner closed-loop triangle is vertically connected with the other side of the adjacent closed-loop triangle . 7.根据权利要求1所述的一种淤泥质土条件下平原临河库盆递进开挖的施工方法，其特征在于，还包括集水井，每条次排水沟挖1-3个集水井，水满后溢流至次排水沟，集水井周围进行围护并设立警示标识。7. the construction method of the progressive excavation of the basin near the river basin in the plain under a kind of silty soil condition according to claim 1, is characterized in that, also comprises water collecting wells, and every secondary drainage ditch digs 1-3 water collecting wells, After the water is full, it overflows to the secondary drainage ditch, and the surrounding wells are fenced and warning signs are set up. 8.根据权利要求1所述的一种淤泥质土条件下平原临河库盆递进开挖的施工方法，其特征在于，连续搅拌桩远离河流的一侧邻连续搅拌桩挖有一圈主排水沟。8. The construction method of progressive excavation of a plain river basin under a kind of silty soil condition according to claim 1, it is characterized in that, a circle of main drainage ditch is dug adjacent to the continuous stirring pile on the side of the continuous stirring pile far away from the river . 9.根据权利要求1所述的一种淤泥质土条件下平原临河库盆递进开挖的施工方法，其特征在于，所述步骤6，最外侧小区域开挖完成以后留一条次排水沟，连通最外侧主排水沟和内侧次排水沟。9. the construction method of the progressive excavation of the plain river basin under a kind of silty soil condition according to claim 1, it is characterized in that, in described step 6, after the excavation of the outermost small area is completed, a secondary drainage ditch is left , which connects the outermost main drainage ditch and the inner secondary drainage ditch. 10.根据权利要求1～9任一项所述的一种淤泥质土条件下平原临河库盆递进开挖的施工方法，其特征在于，用于淤泥质土层的开挖。10 . The construction method for progressive excavation of a river basin in a plain under silty soil conditions according to any one of claims 1 to 9 , characterized in that it is used for excavation of a silty soil layer. 11 .
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