Method for calculating axial force distribution of core soil full-length bonding type counter-pulling anchor rod

Abstract

The invention provides a method for calculating axial force distribution of a core soil full-length bonding type counter-pulling anchor rod, which comprises the following steps of: carrying out stress analysis on an anchor rod stress micro-unit to obtain a corresponding anchoring body control differential equation and an axial force analytic expression; according to the anchoring body control differential equation and the axial force analytic expression of the stress micro-unit, establishing a full-length bonding type opposite-pulling anchor rod mechanical model according to the situation that deformation at the segmented position of the stress micro-unit is continuous and shear stress and shear displacement are in a linear elastic relation; and according to a mechanical model, substituting the stratum and anchor rod parameters, and calculating the axial force of the full-length bonding type opposite-pulling anchor rod. The core soil full-length bonding type opposite-pulling anchor rod mechanical model is provided which satisfies the actual working state of the opposite-pulling anchor rod, considers the influence of the double-sidewall method side pilot tunnel excavation sequence, is used for predicting the axial force of the opposite-pulling anchor rod at a certain position, provides a reference for design and construction of the opposite-pulling anchor rod, can further obtain distribution curve of the axial force of the full-length bonding type opposite-pulling anchor rod along the full length of the rod body, and can obtain the axial force distribution curve only by inputting simple geological exploration parameters.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering measurement and calculation, in particular to a calculation method for axial force distribution of a core-soil through-length bonded tension anchor rod. Background technique [0002] The double-side wall method is an excavation method applied to long-span tunnels in weak rock formations. It refers to dividing the long-span tunnel into three small-span sections, excavating the left and right pilot pits in sequence, and finally excavating and reserving the core soil; In specific construction, the excavation of the left and right side pilot tunnels will cause severe disturbance to the core soil, making the core soil in a one-way or two-way unfavorable stress state; Therefore, the core of the double-side wall method is to ensure the stability and firmness of the reserved core soil. In order to ensure the safe construction of long-span tunnels with the double-side wall method, the cor...

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Problems solved by technology

[0004] However, the mechanical properties of the full-length bonded anti-tension anchor, especially the distribution of the axial force along the longitudinal length of the rod body, are not yet clear. Distinguish the grout anchors, and consider the excavation sequence of the side pilot tunnels, and design an analysis method for the axial force of the full-length bonded opposite tension anchors

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