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Construction road structure on soft soil foundation and construction method

A technology for the construction of access roads and soft soil foundations, applied in soil protection, infrastructure engineering, roads, etc., can solve the problems of low bearing capacity, large demand for sand and gravel, extrusion on both sides, etc., to reduce construction costs, protect Ecological environment, effect of reduced use

Active Publication Date: 2020-09-01
CHINA RAILWAY ERYUAN ENG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the characteristics of high natural water content, high compressibility, low bearing capacity and low shear strength of soft soil, it is difficult to build access roads; for extremely soft soil areas with extremely low bearing capacity, it is sometimes difficult for small construction machinery to build access roads. approach
The current construction access roads are mainly directly filled with sand or stones, and there are often the following problems: (1) When sand or stones are used to build construction access roads on soft soil, in order to be able to bear heavy machinery, it is usually necessary to fill thicker The demand for sand and gravel is large, which is not conducive to the protection of the ecological environment; (2) the gravity of the sand and gravel itself is relatively large, which will generate a large load on the base, thereby reducing the construction machinery load that the sidewalk can bear; (3) The integrity of the construction access road made of sand and gravel in the soft soil section is poor, and the construction access road is prone to local subsidence and extrusion on both sides under the long-term action of construction machinery; (4) The groundwater level in the soft soil section is relatively high. Under the environment, muddy water infiltrates into the sand and gravel construction access road, which is prone to diseases such as mud and mud

Method used

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  • Construction road structure on soft soil foundation and construction method
  • Construction road structure on soft soil foundation and construction method
  • Construction road structure on soft soil foundation and construction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A construction access road structure on soft ground, such as Figure 1-Figure 3 As shown, it includes light board layer 2 and crushed stone layer 1, light board layer 2 is laid on the lower layer of gravel layer 1, bagged sand pebbles 4 and several fixed stakes 3 are arranged on both sides of the construction access road, bagged sand Pebbles 4 and fixed stakes 3 are arranged along the line direction.

[0041] Specifically, the lightweight board layer 2 includes several rigid foam boards, and the several rigid foam boards are arranged along the line direction. The planar shape of each rigid foam board is a rectangle. The light board layer 2 includes two layers, the upper and lower layers are assembled by several rigid foam boards, the length direction of the upper rigid foam board is arranged along the longitudinal direction of the line, that is, the longitudinal rigid foam board 21; The length direction of the foam board is arranged along the transverse direction of t...

Embodiment 2

[0056] Based on embodiment 1, present embodiment also provides a kind of construction method of the construction access road on the soft ground, comprises the following steps:

[0057] S1. Level the plain ground and lay horizontal rigid foam boards 23, which should be stacked neatly when laying;

[0058] S2. Drive in fixed wooden piles 3 at intervals of 2m along the longitudinal direction of the line. The fixed wooden piles 3 penetrate the extremely soft soil foundation. When the extremely soft soil foundation is thick and difficult to penetrate, the depth of insertion into the extremely soft foundation should be greater than 3m;

[0059] S3, laying the composite geomembrane 22, should be paved evenly when laying, pay attention to avoid sharp objects piercing the composite geomembrane 22, before laying the upper vertical rigid foam board 21, the construction machinery must not directly roll the composite geomembrane 22;

[0060] S4. Lay the vertical rigid foam boards 21. When ...

Embodiment 3

[0064] Based on the above-mentioned embodiments 1-2, this embodiment provides an example of calculating the thickness of the rigid foam board for the construction access road structure on the above-mentioned soft soil foundation:

[0065] Given: the wheel load F of the construction machinery is 120kN, the wheel ground width a is 0.2m, the wheel ground length b is 0.6m, the thickness of the gravel cushion, the pressure diffusion angle of the gravel cushion is 30°, and the pressure diffusion of the rigid foam board angle is 45°, and the bearing capacity of the soft soil foundation is 80kPa, then it can be known that:

[0066] a 1 =a+2d 1 tanθ 1 =0.2+2×0.3×tan30°=0.55m

[0067] b 1 =b+2d 1 tanθ 2 =0.6+2×0.3×tan30°=0.95m

[0068]

[0069] get d 2 ≤0.25m.

[0070] That is, the total thickness of the rigid foam board is greater than 0.25m, that is, the thickness of the longitudinal rigid foam board 21 and the transverse rigid foam board 23 is greater than 0.125m.

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Abstract

The invention relates to the field of road engineering, in particular to a construction road structure on a soft soil foundation. The structure comprises a light board layer and a gravel layer, wherein the light board layer is laid on the lower layer of the gravel layer, and bagged sand pebbles and a plurality of fixed wooden piles are arranged on the two sides of the construction road, and the bagged sand pebbles and the fixed wood piles are arranged in a line direction. According to the structure, the light board layer is laid on the soft soil foundation, a construction mechanical load is uniformly dispersed into the soft soil foundation, further, moving of the light board layer is limited through the fixed wooden piles, and when the construction mechanical load acts on the constructionroad, ground water extruded at the bottom of the light board layer is discharged through the bagged sand pebbles on the two sides, and meanwhile, a construction road is stable. The construction road structure is high in integrity, and the possibility of occurrence of diseases such as local subsidence, extrusion or rising soil on two sides is greatly reduced.

Description

technical field [0001] The invention relates to the field of road engineering, in particular to a construction access road structure and a construction method on soft ground. Background technique [0002] Engineering construction is inseparable from construction access roads. In recent years, with the rapid development of my country's infrastructure construction, a large number of engineering constructions have been carried out in soft soil areas such as silt or muddy soil, peat and peaty soil. Due to the characteristics of high natural water content, high compressibility, low bearing capacity and low shear strength of soft soil, it is difficult to build access roads; for extremely soft soil areas with extremely low bearing capacity, it is sometimes difficult for small construction machinery to build access roads. approach. The current construction access roads are mainly directly filled with sand or stones, and there are often the following problems: (1) When sand or stone...

Claims

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Application Information

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IPC IPC(8): E02D3/10E01C3/04E01C9/00
CPCE02D3/10E01C3/04E01C9/002
Inventor 薛元张东卿张建文李安洪刘菀茹邱永平冯子亮沈均陈劲周文洋李睿肖杭
Owner CHINA RAILWAY ERYUAN ENG GRP CO LTD
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