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Method for calculating ultimate bearing capacity of multi-section chambering type anchor rod in soil body

A technology of ultimate bearing capacity and calculation method, applied in the fields of foundation engineering and geotechnical engineering, it can solve the problems of unsuitable soil, actual engineering deviation, and the failure of expanding bolts to reflect the mechanical effect of expanding bolts, so as to achieve a clear mechanical mechanism. , the calculation method is simple

Pending Publication Date: 2021-10-29
INST OF EXPLORATION TECH OF CHINESE ACAD OF GEOLOGICAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main problems are: (1) the prediction model is only applicable to rock mass, not to soil mass; (2) the anchorage interface model of this model is a shear slip model, for the application of full-length bonded anchor It is better, but it cannot reflect the mechanical effect of reaming bolts for reaming bolts; (3) The prediction model only gives the shear failure mode of full-length bonded bolts, and the failure mode of multi-section reaming bolts not yet covered
Therefore, the predicted results often have large deviations from the actual engineering

Method used

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  • Method for calculating ultimate bearing capacity of multi-section chambering type anchor rod in soil body
  • Method for calculating ultimate bearing capacity of multi-section chambering type anchor rod in soil body
  • Method for calculating ultimate bearing capacity of multi-section chambering type anchor rod in soil body

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Embodiment 1

[0061] This embodiment describes the present invention in detail in conjunction with the accompanying drawings.

[0062] The mechanical transfer modes of multi-section reaming bolts in soil are divided into two types: arch transfer mode and column transfer mode ( figure 1 , figure 2 ). The pullout failure of the multi-stage reaming bolt experiences three stages: crack initiation, crack deflection, and crack penetration. The crack initiation angle In the final stage of crack deflection or the initial stage of crack penetration, the pullout load of the multi-section reaming anchor reaches the maximum, and the corresponding peak load is the ultimate bearing capacity; the ultimate bearing capacity of the multi-section reaming anchor is determined by the lateral resistance bearing capacity and The end resistance bearing capacity constitutes; in the arch failure mode of the multi-section reaming anchor, the arch crack at the turning end of the reaming conforms to the soil arch f...

Embodiment 2

[0128] This embodiment specifically illustrates the effect of using the present invention to predict the ultimate bearing capacity of a multi-section reaming bolt.

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Abstract

The invention discloses a method for calculating ultimate bearing capacity of a multi-section chambering type anchor rod in a soil body. The method comprises the following steps: (1) determining geometric dimensions and rock-soil strength parameters of the multi-section chambering type anchor rod; (2) calculating the side resistance bearing capacity and the end resistance bearing capacity in the arched transmission mode, and then calculating the ultimate bearing capacity of the multi-section chambering type anchor rod in the arched transmission mode; (3) calculating the side resistance bearing capacity and the end resistance bearing capacity in the cylindrical transmission mode, and then calculating the ultimate bearing capacity of the multi-section chambering type anchor rod in the cylindrical transmission mode; and (4) acquiring the ultimate bearing capacity of the anchor rod by taking the minimum value of the ultimate bearing capacity of the arch transmission mode and the ultimate bearing capacity of the cylindrical transmission mode of the multi-section chambering type anchor rod. The ultimate bearing capacity of the multi-section reaming type anchor rod commonly used in the fields of foundation engineering and geotechnical engineering is calculated, and the method comprises a mechanical transmission mode of the multi-section reaming type anchor rod, ultimate bearing capacity composition of the multi-section reaming type anchor rod, ultimate bearing capacity calculation under different transmission mechanisms and ultimate bearing capacity valuing of the multi-section reaming type anchor rod.

Description

technical field [0001] The invention relates to a method for calculating the ultimate bearing capacity of a multi-section reaming type bolt in soil, belonging to the fields of foundation engineering and geotechnical engineering. Background technique [0002] The anchoring length of the non-reaming anchor is generally less than 10m. When the length of the anchor exceeds the effective anchoring length, the bearing capacity will not increase significantly even if the length of the anchor is increased. In order to improve the bearing capacity of anchor rods and deal with the problem of insufficient soil bearing capacity in soft soil areas, some researchers have developed reaming anchor rods. In recent decades, reaming anchors have been greatly developed, and the types of anchors tend to be diversified, such as self-supporting anchors, bulbous anchors, recyclable expansion head anchors, inflatable anchors, umbrella anchors, high-pressure anchors, etc. Jet expansion head bolts, e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06F119/14
CPCG06F30/20G06F2119/14
Inventor 周云涛石胜伟蔡强梁炯姜昭群王全成杨栋
Owner INST OF EXPLORATION TECH OF CHINESE ACAD OF GEOLOGICAL SCI
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