Double shield tbm tunneling construction method for hard rock formation

Abstract

The invention belongs to the field of tunnel excavation, and specifically discloses a double-shield TBM excavation construction method for hard rock strata. The method can timely and effectively guide the excavation construction and support design of the double-shield TBM in the hard rock stratum. The double-shield TBM tunneling construction method for the hard rock formation includes grading the suitability of the double-shield TBM tunneling under the hard rock formation, so as to guide the steps of tunneling construction and subsequent support according to the classification. Since the judgment parameters used in the classification are easy to obtain and have strong immediacy, and because the rock wear resistance and penetration ratio parameters are all recorded during equipment excavation, they can truly reflect the objective situation of actual excavation and avoid The deviation between the theoretical test value and the actual operation is eliminated, so the timeliness and accuracy of the classification are effectively guaranteed. Based on this, the construction guidance and support design proposed can effectively guide the tunneling construction of the double-shield TBM in the hard rock formation in a timely and effective manner. And support, greatly improving the construction efficiency and construction safety.

Description

technical field [0001] The invention belongs to the field of tunnel excavation, and in particular relates to a double-shield TBM excavation construction method for hard rock formations. Background technique [0002] In tunnel construction, by grading the excavated rock mass, it is beneficial to design excavation parameters and support parameters for surrounding rocks with different conditions. Tunnel mechanical excavation often uses full-section tunnel boring machine for surrounding rock excavation. The English abbreviation of full-section tunnel boring machine is TBM; TBM is mainly divided into open TBM, single-shield TBM and double-shield TBM, of which double-shield TBM It has strong adaptability to geological conditions, and the peripheral of the whole machine is equipped with a cylindrical shield structure that is consistent with the diameter of the machine, which is conducive to excavating soft, broken or complex rock formations. When using double-shield TBM excavation...

AI Technical Summary

Problems solved by technology

[0005] 1. It involves some parameters that are difficult to obtain directly, such as the elastic wave velocity of the surrounding rock, the specific work of rock chiseling, etc., and need to be tested separately. Therefore, the parameter acquisition is not instant, and it is difficult to guide the tunneling construction in time. It is mostly used for the data in the later stage of construction collection and analysis

[0006] 2. This method first needs to classify the surrounding rock, and the existing authoritative surrounding rock classification methods mainly include the BQ classification method based on the basic quality index BQ of the rock mass in the "Code for Design of Highway Tunnels" (JTG D70-2004), The hydropower surrounding rock engineering geological classification HC classification method, Q system classification method and RMR classification method in the "Code for Hydropower Engineering Geological Exploration" (GB50287-2016), although these classifications are rigorous and systematic, but these classification methods They only rely on the qualitative characteristics of the basic quality of the rock mass and the elastic wave velocity of the surrounding rock to classify, and have limited guidance on the design of construction parameters and support parameters for double-shield TBM tunneling in hard rock formations.

But Q TBM The model has many parameters, including a total of 21 input parameters. At the same time, some input parameters are irrelevant to TBM performance. Guidance on the Design of Construction Parameters and Support Parameters of Tunneling in Hard Rock Stratum

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