CN216664079U

CN216664079U - Be used for coastal area silty filling soil road bed to handle structure

Info

Publication number: CN216664079U
Application number: CN202123133057.3U
Authority: CN
Inventors: 杨宽; 彭典华; 冯爱国; 李显平; 张微坤
Original assignee: Wuhan Surveying Geotechnical Research Institute Co Ltd of MCC
Current assignee: Wuhan Surveying Geotechnical Research Institute Co Ltd of MCC
Priority date: 2021-12-14
Filing date: 2021-12-14
Publication date: 2022-06-03
Anticipated expiration: 2031-12-14

Abstract

The utility model provides a treatment structure for a powdery filling soil subgrade in a coastal region. The treatment structure comprises a drainage plate inserted and beaten in the powdery filling soil layer, a medium-coarse sand cushion layer laid on the surface of the powdery filling soil layer and a broken stone or brick residue layer laid on the surface of the medium-coarse sand cushion layer, the drainage plate penetrates through the medium-coarse sand cushion layer and is inserted and beaten in the powdery filling soil layer, the head of the drainage plate is positioned in the medium-coarse sand cushion layer, and the beating depth of the drainage plate is 8-10 m; the paving thickness of the broken stone or brick slag layer is 50-100 cm, and the paving thickness of the medium coarse sand cushion layer is 30-50 cm. The dynamic compaction is carried out after the powdery filling soil layer is treated, so that the characteristic value of the bearing capacity of the foundation is greatly improved, the requirement on the bearing capacity of the foundation in a plant area is met, and the cost of foundation treatment of the project is greatly reduced.

Description

Be used for coastal area silty filling soil road bed to handle structure

Technical Field

The utility model relates to the field of geotechnical engineering, in particular to a treatment structure for a powdery filling soil subgrade in a coastal region.

Background

The project is located in a sea-filling area, manual filling is mainly carried out by using silt in the sea-filling process, the upper stratum is mainly silt filling and is in a loose state, the weak permeable layer is arranged, and the permeability coefficient of the silt filling is 4.14 multiplied by 10^-4About cm/s. The bearing capacity of the silt filling cannot meet the design requirement, so reinforcement treatment is needed, and the silt is special, so the existing treatment mode cannot achieve the reinforcement effect, and the treated bearing capacity of the foundation cannot meet the requirement of the natural foundation bearing capacity of the auxiliary building.

Disclosure of Invention

Aiming at the defects in the prior art, the utility model provides a treatment structure for a powdery filling soil subgrade in a coastal region, which can effectively improve the bearing capacity of the powdery filling soil subgrade and greatly reduce the project construction cost.

In order to achieve the technical purpose, the utility model provides a treatment structure for a powdery filling soil subgrade in a coastal region, which is characterized in that: the treatment structure comprises a drainage plate inserted and beaten in the powdery filling soil layer, a medium-coarse sand cushion layer laid on the surface of the powdery filling soil layer and a broken stone or brick residue layer laid on the surface of the medium-coarse sand cushion layer, the drainage plate penetrates through the medium-coarse sand cushion layer and is inserted and beaten in the powdery filling soil layer, the head of the drainage plate is positioned in the medium-coarse sand cushion layer, and the beating depth of the drainage plate is 8-10 m; the paving thickness of the broken stone or brick slag layer is 50-100 cm, and the paving thickness of the medium coarse sand cushion layer is 30-50 cm.

The utility model further adopts the technical scheme that: the processing structure further comprises a plurality of first tamping points and a plurality of second tamping points which are distributed on the powder filling soil layer area, the first tamping points and the second tamping points are distributed in a crossed and equidistant mode, and the tamping energy of each tamping point is controlled to be 1500-3000 kN-m.

The utility model has the advantages that: the mud content in the medium and coarse sand cushion layer is not more than 5%, and the maximum particle diameter is not more than 5 cm.

The utility model has the following excellent technical scheme: the top level of the powdery filling soil layer is 1.0-1.5 m below the design level of the roadbed.

The utility model has the following excellent technical scheme: the drainage plate is made of SPB100-C type plastic.

The utility model has the following excellent technical scheme: the maximum particle size of the broken stone or brick slag in the laid broken stone or brick slag layer is not more than 30 cm.

The treatment structure can adjust the distance between the plastic drainage plates according to different indexes such as the clay content, the permeability coefficient and the like in the powdery filling soil layer within the subgrade treatment range; the thickness of the sand cushion layer can be adjusted according to the water yield of the plastic drainage plate, and the thickness of broken stones and brick slag and the ramming energy can be adjusted according to the ramming amount.

The foundation bearing capacity characteristic value is improved from 80kPa to 120kPa after the treatment by treating the powdery filling soil layer with the thickness of about 8-10 m and combining the sectional dynamic compaction, the requirement on the bearing capacity of the foundation in a plant is met, and the foundation treatment cost of the project is greatly reduced.

Drawings

FIG. 1 is a schematic plan view of the present invention;

fig. 2 is a schematic cross-sectional view of the present invention.

In the figure: 1-first ramming point, 2-second ramming point, 3-drainage plate, 4-medium coarse sand cushion layer, 5-broken stone or brick slag layer and 6-powdery filling soil layer.

Detailed Description

The utility model is further illustrated by the following figures and examples. Fig. 1 to 2 are drawings of embodiments, which are drawn in a simplified manner and are only used for the purpose of clearly and concisely illustrating the embodiments of the present invention. The following claims presented in the drawings are specific to embodiments of the utility model and are not intended to limit the scope of the claimed invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "inner", "outer", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or the orientations or positional relationships that the products of the present invention are conventionally placed in use, or the orientations or positional relationships that are conventionally understood by those skilled in the art, and are used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the equipment or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

In the embodiment, the treatment structure for the powdery filling soil subgrade in the coastal region comprises a drainage plate 3 inserted into a powdery filling soil layer 6, a medium-coarse sand cushion layer 4 laid on the surface of the powdery filling soil layer, a broken stone or brick slag layer 5 laid on the surface of the medium-coarse sand cushion layer 4, and a plurality of first tamping points 1 and second tamping points 2 arranged in the area of the powdery filling soil layer 6, as shown in fig. 1 and 2; the top elevation of the powdery filling soil layer 6 is 1.0-1.5 m below the design elevation of the roadbed. The drainage plate 3 is made of SPB100-C type plastic, the drainage plate 3 penetrates through the medium-coarse sand cushion layer 4 and is inserted into the powdery filling soil layer 6, the head of the drainage plate is positioned in the medium-coarse sand cushion layer 4, and the driving depth of the drainage plate 3 is 8-10 m; the paving thickness of the broken stone or brick slag layer 5 is 50-100 cm, the maximum particle size of broken stones or brick slag in the broken stone or brick slag layer 5 is not more than 30cm, the paving thickness of the medium coarse sand cushion layer 4 is 30-50 cm, the mud content in the coarse sand cushion layer 4 is not more than 5%, and the maximum particle diameter is not more than 5 cm. The first tamping points 1 and the second tamping points 2 are distributed in a crossed and equidistant mode, and the tamping energy of each tamping point is controlled to be 1500-3000 kN-m.

The concrete construction process of the utility model is further explained by combining concrete projects, the length of the roadbed treatment of the project is 5km, the width is 10m, the thickness of the powdery filling soil layer 6 is about 8-10 m, the field in the roadbed treatment range is cleaned and leveled before the treatment, and the roadbed elevation is reduced to 1.0m below the design elevation; then laying a medium coarse sand cushion layer 4, wherein the mud content in the medium coarse sand cushion layer 4 is not more than 5%, the maximum particle diameter is not more than 5cm, and the laying thickness is 30 cm; then inserting and punching the SPB100-C type plastic drainage plate 3, wherein the punching depth of the plastic drainage plate 3 is within the range of 8-10 m, the drainage plate is exposed by 10cm, and a horizontal drainage channel is formed in the middle coarse sand cushion layer 4. Paving a gravel layer, wherein the maximum particle size of the gravel is not more than 10cm, and the paving thickness is 100 cm. And setting a construction section every 50m along the road direction, performing first-time dynamic compaction on the first tamping point 1 in the long edge direction, performing second-time dynamic compaction on the second tamping point 2 after the first-time dynamic compaction is completed, and pushing the tamping pit to be fully compacted after the second-time dynamic compaction is completed, wherein the tamping energy is controlled to be 1500-3000 kN.m. And (3) discharging the underground water in the powdery filling soil layer 6 out of the field through the drainage plate 3 and the medium coarse sand cushion layer 4 by dynamic compaction vibration. After the treatment is finished, the characteristic value of the bearing capacity of the foundation of the project is improved to 120kPa from 80kPa, the requirement of the bearing capacity of the foundation in the factory is met, and the cost of the foundation treatment of the project is greatly reduced.

While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the utility model as defined in the appended claims.

Claims

1. The utility model provides a be used for coastal area silty wash fill dirt road bed to handle structure which characterized in that: the treatment structure comprises a drainage plate (3) inserted into the powdery filling soil layer (6), a medium-coarse sand cushion layer (4) paved on the surface of the powdery filling soil layer and a broken stone or brick slag layer (5) paved on the surface of the medium-coarse sand cushion layer (4), wherein the drainage plate (3) penetrates through the medium-coarse sand cushion layer (4) and is inserted into the powdery filling soil layer (6), the head of the drainage plate is positioned in the medium-coarse sand cushion layer (4), and the driving depth of the drainage plate (3) is 8-10 m; the paving thickness of the broken stone or brick slag layer (5) is 50-100 cm, and the paving thickness of the medium coarse sand cushion layer (4) is 30-50 cm.

2. The structure for treating the powdery filling soil subgrade in the coastal area according to the claim 1, which is characterized in that: the processing structure further comprises a plurality of first tamping points (1) and second tamping points (2) which are distributed in a powdery filling soil layer (6) area, the first tamping points (1) and the second tamping points (2) are distributed in a crossed and equidistant mode, and the tamping energy of each tamping point is controlled to be 1500-3000 kN-m.

3. A treatment structure for a powdery-filled soil roadbed in a coastal region according to claim 1 or 2, wherein: the mud content in the medium and coarse sand cushion layer (4) is not more than 5%, and the maximum particle diameter is not more than 5 cm.

4. A treatment structure for a powdery-filled soil roadbed in a coastal region according to claim 1 or 2, wherein: the top elevation of the powdery filling soil layer (6) is 1.0-1.5 m below the design elevation of the roadbed.

5. A treatment structure for a powdery-filled soil roadbed in a coastal region according to claim 1 or 2, wherein: the drainage plate (3) is an SPB100-C type plastic drainage plate.

6. A treatment structure for a powdery-filled soil roadbed in a coastal region according to claim 1 or 2, wherein: the maximum particle size of the broken stone or brick slag in the broken stone or brick slag layer (5) is not more than 30 cm.