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Concentric-circle-shaped reinforced rib geotechnological supporting structure for soft soil cutting excavation slope and top-down method of concentric-circle-shaped reinforced rib geotechnological supporting structure

A technology of retaining structure and reinforced soil, which is applied in foundation structure engineering, excavation, construction, etc., and can solve problems such as slope stability and construction difficulties

Inactive Publication Date: 2014-02-26
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a soft soil cutting slope back-shaped reinforced geotechnical retaining structure and its reverse construction method in view of the problems of slope stability and construction difficulties when excavating a high cutting slope in soft soil. Introducing the reverse construction method into slope protection, this support method can not only meet the safety and stability requirements of soft soil cutting slopes, construction safety and feasibility, but also reduce construction difficulty, save slope retaining structures and slope defense cost

Method used

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  • Concentric-circle-shaped reinforced rib geotechnological supporting structure for soft soil cutting excavation slope and top-down method of concentric-circle-shaped reinforced rib geotechnological supporting structure
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  • Concentric-circle-shaped reinforced rib geotechnological supporting structure for soft soil cutting excavation slope and top-down method of concentric-circle-shaped reinforced rib geotechnological supporting structure

Examples

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Effect test

Embodiment 1

[0017] A back-shaped reinforced geotechnical retaining structure for a soft soil cutting slope, comprising: a soft soil cutting slope 1 and a slope toe structure 4, characterized in that, on the soft soil cutting slope 1, there is a backfill soil body 2 The step is provided with a reinforcing material 3 in the step, and the reinforcing material 3 starts at the shoulder of the soft soil cutting side slope and extends to the last step at the toe of the slope, and is located between the second step and the penultimate step. The reinforced material in the second step is curved in an S shape, and the slope toe structure 4 is offset against the last step.

Embodiment 2

[0019] A reverse construction method for a back-shaped reinforced geotechnical retaining structure on a soft soil cutting slope. The specific steps are: ① leveling the slope top site, draining the accumulated water, so that mechanical equipment can enter the site for construction; Excavate the platform, and then backfill and compact the gravel and pebble soil in two layers. After the first layer is compacted and leveled, lay a layer of reinforcement material horizontally along the direction back to the free surface, and lay a layer of reinforcement material on the free surface of the slope. Reinforcement materials are reserved for overlapping and anchoring in the direction, and then the second layer of gravel and pebble soil is laid to construct the slope abutment platform and take the slope abutment platform as the Nth step, and N is the number of steps, so that N= 1; ③ Excavate the foundation trench downward next to the Nth step, and then backfill and compact the gravel and p...

Embodiment 3

[0022] a kind of like figure 1The shown soft soil cutting slope back-shaped reinforced retaining structure of the present invention is a stepped retaining structure constructed by the reverse method. Starting from the shoulder of the soft soil cutting side slope, excavation-backfilling shall be carried out in stages from top to bottom. Every time a level of excavation is completed, the formed slope shall be backfilled with flexible geotechnical retaining structure construction; each level of weak slope The body support and retaining structure adopts "S" shape backfilling and compacting the soil, and is constructed step by step into a step shape. The width of the steps is 2.5-3.5m, the height of the steps is 2.0-3.0m, and the overlapping thickness of two adjacent steps 0.5m. When the backfill soil (2) of a single step is compacted and leveled in layers, the reinforcing material (3) is laid horizontally along the width direction of the step, bent upward at the edge of the step,...

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Abstract

A concentric-circle-shaped reinforced rib geotechnological supporting structure for a soft soil cutting excavation slope and a top-down method of the concentric-circle-shaped reinforced rib geotechnological supporting structure are suitable for evacuating a cutting excavation slope of road or railway. The top-down method is characterized in that a gradually-evacuated and constructed geotechnological supporting structure is carried out at the shoulder of the soft soil cutting excavation slope from top to bottom; the supporting structure is evacuated by adopting an S-shaped concentric-circle-shaped reinforced rib flexible geotechnological support and each stage of circle-shaped reinforced rib supporting structure is abutted and coupled to a whole body by adopting ribs; a cutting excavation slope site is protected by short concrete wall bankets; and after the cutting evacuation construction is ended, a stepped circle-shaped reinforced rib flexible geotechnological supporting structure is synchronously formed. According to the concentric-circle-shaped reinforced rib geotechnological supporting structure for the soft soil cutting excavation slope and the top-down method of the concentric-circle-shaped reinforced rib geotechnological supporting structure disclosed by the invention, potential safety hazards that the slope falls off and the like due to one-time over-deep excavation in the cutting evacuation slope are avoided; the key problem of free face stability existing in the deep excavation of soft soil is solved; meanwhile, the construction is feasible and quick; and the common action of the ribs and soil in a reinforced rib system is completed, and the service safety and the integral stability of the supporting structure for the soft soil cutting excavation slope are further enhanced.

Description

technical field [0001] The invention relates to excavation and reinforcement methods for cutting slopes, in particular to a back-shaped reinforced geotechnical retaining structure for soft soil cutting slopes suitable for reinforcement of soft soil cutting slopes and its reverse construction method, which belongs to the field of highway subgrades . Background technique [0002] my country has a vast territory and complex geological and topographical conditions. With the rapid development of highway construction, many complex geotechnical problems and engineering diseases will be encountered along the highway. Among them, the stability of deep excavation cuttings in soft soil is one of the technical problems to be solved urgently in the project. Weak soil layers are mainly silt, silty soil, partial flushing soil, miscellaneous filling soil and other highly compressible soil, which have the characteristics of large natural void ratio, low shear strength, high compressibility ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D17/20
Inventor 石名磊张浩赵宇张瑞坤
Owner SOUTHEAST UNIV
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