Rock mass classification method for TBM tunnel

Abstract

The invention discloses a rock mass classification method for a TBM tunnel. The rock mass quality of surrounding rock mass is determined by taking a rock mass basic quality index BQ as a criterion under the consideration of rock mass hardness and rock mass integrity and the consideration of the combination relationship of groundwater, ground stress, engineering axis orientation and occurrence of main structural planes as dressing factors. The method comprises the following steps: 1, performing inversion formula calculation according to the relationships between uniaxial saturated compressive strength of rock mass and TBM equipment parameters, tunneling parameters and slag morphological parameters; and 2, performing calculation according to the relationship between a rock mass integrity coefficient and the TBM equipment parameters, tunneling parameters and slag morphological parameters. Based on the classification method of surrounding rock of underground engineering in the current Classification Standard for Engineering Rock Mass, parameters being difficult to obtain are avoided. The relationships between the easily obtained tunneling parameters as well as slag characteristics andthe indexes required for rock strength and integrity are determined according to the composite relationship between rock, machine and slag in the TBM construction process, thereby achieving the rapidsurrounding rock division of tunnel in TBM construction.

Description

technical field [0001] The invention relates to a method for grading tunnel rock mass, in particular to a method for grading TBM tunnel rock mass. Background technique [0002] During tunnel construction by TBM (abbreviation of Tunnel Boring Machine in English, tunnel boring machine), rock mass is often blocked or closed by huge equipment or lining segments, and it is difficult to directly observe and measure rock mass and classify rock mass using current regulations. At present, the rock mass is mainly classified according to their own experience on the basis of the traditional drilling and blasting tunnel rock mass classification, which lacks scientific basis and requires repeated shutdown inspections, which is time-consuming and laborious, and the accuracy and uniformity are low, which greatly limits TBM automatic and efficient excavation. Contents of the invention [0003] The purpose of the present invention is to provide a method for grading TBM tunnel rock mass. ...

AI Technical Summary

Problems solved by technology

At present, the rock mass is mainly classified according to their own experience on the basis of the traditional drilling and blasting tunnel rock mass classification, which lacks scientific basis and requires repeated shutdown inspections, which is time-consuming and laborious, and the accuracy and uniformity are low, which greatly limits Automatic and efficient tunneling with TBM

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