Static TBMEPB cutter wear back analysis method based on beam-spring unit

Abstract

The invention provides a static TBMEPB cutter wear back analysis method based on a beam-spring unit, which is suitable for shield tunneling machine cutter wear analysis when a cutter cuts to a junction position of a soft rock stratum and a hard rock stratum in a TBM hard rock tunneling process, and comprises the following steps: firstly, reducing the surface of a cut rock mass through a beam unit with better mechanical property; meanwhile, connecting the surfaces of two adjacent layers of rock masses through a connecting spring and an interlayer spring, so that shearing and deformation of the rock masses in the cutting process are simulated and reduced; secondly, applying a curved surface spring and a reasonable boundary on the basis of the constructed beam spring calculation model, and then applying cutter cutting stress acting on the rock mass to the model; and finally, through nonlinear analysis of finite elements, calculating a series of stress and strain responses generated by cutting of the tool, such as axial stress, shear stress, torsional stress, displacement, deformation and rock counterforce, generated by cutting of the tool, of the rock stratum, and subjecting the abrasion condition of the tool to back analysis according to the stress and strain responses.

Description

technical field [0001] The invention belongs to the category of tool wear during shield tunnel construction, and is applicable to the analysis of tool wear of a shield machine when the tool cuts to the junction of soft and hard rock layers during TBM hard rock excavation and EPB soft soil advancement, and specifically relates to a A static TBM&EPB tool wear back analysis method based on beam-spring element. Background technique [0002] In the construction process of shield tunnels, the wear and chipping of cutting tools are common phenomena. Shield machines usually use high-strength hobs to squeeze and break rocks. The strength of cutting tools is stronger than that of the rock mass to be broken. , the jack supports the cutter head to drive the cutter body and the rock formation to squeeze and rub against each other, and this process produces wear. The problems such as the wear of the cutter head and cutter during the shield tunneling process mainly focus on the wear of cut...

AI Technical Summary

Problems solved by technology

Existing analysis mostly uses discrete element software, and on the basis of it, analysis of tool rock-breaking wear in a two-dimensional plane state is carried out. However, the actual rock-breaking process is a three-dimensional rock-breaking process, and the rock mass cut by the tool is complex and complex. Not a simple single mean body

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