Hierarchical summation method for predicting hob abrasion through abrasion ratio consumption indexes

Abstract

The invention relates to a hierarchical summation method for predicting hob abrasion through abrasion ratio consumption indexes and belongs to the field of underground tunnel engineering construction technology. In order to quantitatively predict the hob abrasion at different hob positions when a shield tunneling machine drives into a compound stratum, statistical analysis is performed on the hob abrasion ratio consumption indexes SWIs (hob abrasion increments corresponding to unit rock-breaking volumes) at different positions according to stratigraphic classification on the basis of hob-by-hob measurement of the hob abrasion and hierarchical statistical analysis of corresponding rock-breaking volumes, and an SWI prediction equation suitable for homogeneous formations is obtained. The relation between the abrasion, the hob installing positions and a tunneling distance is considered at the same time in the SWIs, physical significance is clear, and the SWI prediction equation is high in prediction precision. The hierarchical summation method for predicting the hob abrasion through the abrasion ratio consumption indexes is proposed according to the correlation between SWI prediction equation coefficients and lithological characters. The method is based on engineering investigation data and is reasonable, the steps are clear, and the method is beneficial for scientifically making budgets, reasonably arranging hob replacement opportunities and improving shield tunneling efficiency and has important theoretical significance and practical value.

Description

technical field [0001] The invention relates to a layered summation method for predicting hob wear amount by using wear specific consumption index, and belongs to the construction technical field of underground tunnel engineering. Background technique [0002] When shield tunneling is used to excavate high-strength composite strata, the biggest risk faced by the project is slow or difficult excavation and severe tool wear. Tool wear has become a key issue affecting project schedule and cost. The integrity of the tool and the judgment of the wear state of the tool are the key factors in shield tunneling. How to accurately and quantitatively predict the wear amount of the hob and judge the wear state is very important for the efficient tunneling of the shield. Accurately predicting the wear amount of the disc hob is of great significance to improving the efficiency of shield tunneling. At present, the hob wear prediction methods at home and abroad can be classified into two ...

AI Technical Summary

Problems solved by technology

The key coefficients in the mechanical model are significantly affected by the test conditions and rock mass properties, and there are limitations in the application of hob wear prediction in composite formations

The empirical prediction method does not sufficiently distinguish the stratum distribution in the hob trajectory and the direction of excavation, which affects its applicability in complex strata with variable rock strata distribution

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