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Prestress anchoring structure suitable for freeze thawed-slope reinforcement in frozen soil region

A technology for anchoring structures and permafrost areas, which is applied in basic structure engineering, sheet pile walls, excavation, etc., can solve problems such as deformation and deformation of anchor cables, and achieve good results and avoid damage.

Inactive Publication Date: 2017-03-22
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

[0003] The purpose of the present invention is to provide a prestressed anchorage structure suitable for the reinforcement of frozen-thaw slopes in permafrost regions, which has the advantage of preventing deformation of the anchor cables during use and solves the problem of deformation of the anchor cables during use

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  • Prestress anchoring structure suitable for freeze thawed-slope reinforcement in frozen soil region
  • Prestress anchoring structure suitable for freeze thawed-slope reinforcement in frozen soil region
  • Prestress anchoring structure suitable for freeze thawed-slope reinforcement in frozen soil region

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[0038]Taking a certain slope as an object, the slope is mainly reinforced by prestressed anchor cable structure, the anchor cable is 4φ15.2mm steel strand, the design load is 400kN, the length of the free section is 15m, the length of the anchor section is 15m; the diameter of the drill hole is 130mm, using M30 mortar is anchored, and the equivalent modulus of the anchor is 30GPa; the slope material is gravel soil, and the shear resistance coefficient of the formation is 0.7MPa / cm. The area where the slope is located has a high altitude, low winter temperature, and seasonal frozen soil. The frozen depth is considered as 1.0m, the frost heaving coefficient η=3%, and the thawing coefficient α 0 = 1.6%.

[0039] First calculate frost heave and thawing deformation, frost heave deformation u sw =1000*0.03=30mm, melting deformation u sh =1000*0.016=16mm. It is worth noting that the frost heave deformation increases the prestress for the anchor cable, as long as it does not exceed...

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Abstract

The invention discloses a prestress anchoring structure suitable for freeze thawed-slope reinforcement in a frozen soil region. The structure comprises a cushion pier; slope surfaces are respectively arranged at the top and the bottom of the left side of the cushion pier; a steel cushion plate is arranged on the left side of the cushion pier; a freeze thawing adaption elastic gasket is arranged on the left side of the steel cushion plate; an anchoring tool is arranged on the left side of the freeze thawing adaption elastic gasket; protective shells coat the outer sides of the anchoring tool, the freeze thawing adaption elastic gasket and the steel cushion plate; a gravel anti-freezing layer is arranged on the right side of the cushion pier; and a self-taking section is arranged on the right side of the gravel anti-freezing layer. The strucure can achieve the deformation preventing effect on an anchor rope through the freeze thawing adaption elastic gasket and the gravel anti-freezing layer, so that the anchor rope is better in use effect, the condition of unstable slope body caused by deformation of the anchor rope in use due to large reduction of prestress of the anchor rope in thaw collapse of frozen soil caused by weak deformation adaptability of the anchor rope structure in use is solved, and the structure is suitable for popularization and application.

Description

technical field [0001] The invention relates to the technical field of anchor cable structures, in particular to a prestressed anchor structure suitable for the reinforcement of freeze-thaw slopes in permafrost regions. Background technique [0002] my country's seasonally frozen soil areas are widely distributed, accounting for about 53.5% of the country's land area. The biggest difference between the frozen soil slopes in this area and the slopes in general areas is that there is frost heaving and thawing on the surface of the slope, that is, water accumulation in the soil in winter. The ice causes the soil to swell, while the spring ice melt causes the soil to settle. This special phenomenon poses a new challenge to the traditional slope retaining structure. Prestressed anchor cables are a common measure for slope support. The existing anchor cable structure mainly consists of an anchor head, a free section and an anchor section. However, the deformation adaptability of ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/20E02D5/74
CPCE02D17/20E02D5/74
Inventor 冯君杨涛杨兵江南
Owner SOUTHWEST JIAOTONG UNIV
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