Surrounding rock deformation monitoring method and prediction method suitable for double-shield TBM

Abstract

The invention discloses a surrounding rock deformation monitoring method and prediction method suitable for a double-shield TBM. The monitoring method mainly comprises three parts of advanced borehole measuring tube design and deformation monitoring based on a quasi-distributed FBG sensing principle, monitoring value correction based on construction process numerical simulation and inversion analysis, and surrounding rock convergence deformation numerical simulation analysis and advanced prediction based on monitoring inversion parameters. The monitoring method and the prediction method have the advantages that the quasi-distributed FBG advanced drilling measurement pipe is utilized, the problem that surrounding rock deformation of a double-shield TBM tunnel is difficult to monitor due to shield and segment shielding is effectively solved, displacement correction is conducted on an imaginary fixed point of the measurement pipe through refined numerical simulation, the creep constitutive parameters of surrounding rock are inverted according to monitoring data, and advanced prediction analysis of the convergence deformation of the surrounding rock is realized based on the numerical model, so that a guidance basis is provided for construction tunneling and support design of a tunnel, and safe and efficient construction of the double-shield TBM is ensured.

Description

technical field [0001] The invention relates to the technical field of tunnel construction monitoring, in particular to a surrounding rock deformation monitoring method and prediction method applicable to a double-shield TBM. Background technique [0002] Double-shield TBM (Tunnel Boring Machine, Tunnel Boring Machine) is more and more widely used in the construction of deep-buried long tunnels because of its safety, high efficiency, suitability for complex strata and little disturbance to surrounding rock. After the excavation and unloading of the surrounding rock of the deep tunnel, the initial three-dimensional stress state becomes a two-dimensional stress state, which easily leads to stress redistribution and stress concentration, and then causes the surrounding rock to converge toward the center of the tunnel, resulting in TBM jamming. [0003] After the tunnel is excavated, the convergent deformation is the most direct reflection of the dynamic development of the surro...

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Problems solved by technology

[0007] Aiming at the current situation that the monitoring of surrounding rock deformation in the construction of double-shield TBM tunnels is difficult and the previous monitoring methods are relatively inefficient or costly, the present invention provides a method for monitoring deformation of surrounding rock suitable for double-shield TBM, through which it can Effective monitoring of the surrounding rock convergence deformation of the double-shield TBM can effectively solve the problem that the double-shield TBM tunnel is difficult to monitor the deformation of the surrounding rock due to shields and segments

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