TBM high-pressure pulsed water-jet rock breaking hypocenter advanced detection device and method thereof

Abstract

The invention provides a TBM high-pressure pulsed water-jet rock breaking hypocenter advanced detection device and a method thereof. The device comprises a high-pressure pulsed water-jet system, a nozzle, a hypocenter sensor, a supporting device, a receiving sensor, a noise sensor and a data acquisition instrument. High-pressure pulsed water-jet impact rock breaking vibration is taken as a hypocenter; the hypocenter sensor receives a rock breaking vibration signal; the receiving sensor arranged in a three-dimensional full-space manner receives the reflective seismic waves; and the noise sensorreceives noise signals of all noise sources of the TBM. A vibration signal and a reflective seismic wave signal are processed by means of separation, reconstruction, denoising and the like and jet pulse frequency, a longitudinal and transverse wave velocity model and a three-dimensional seismic section are obtained by using a conventional seismic analysis method, and surrounding rock strength index spatial distribution is obtained by fitting analysis, so that advanced prediction of unfavorable geologic bodies and rock properties is realized. The device and the method are scientific in principle, safe, efficient, energy-saving and environment-friendly and have good application prospects.

Description

technical field [0001] The invention relates to the technical field of advanced geological detection of underground engineering, in particular to a device and method for advanced detection of rock-breaking seismic sources by TBM high-pressure pulsed water jets. Background technique [0002] Tunnel construction occupies an important position in engineering fields such as transportation, municipal administration, and mining. Drill and blast method and TBM (tunnel boring machine) are two commonly used tunnel construction methods. Compared with the traditional drilling and blasting method, TBM construction has a high degree of mechanization, and can simultaneously carry out excavation, support and slag discharge to realize continuous operation. It has the advantages of fast construction speed, small environmental impact and high comprehensive benefits. Therefore, TBM is more and more widely used in various engineering fields. However, the ability of TBM to adapt to complex geol...

AI Technical Summary

Problems solved by technology

Affected by the electromagnetic interference of the TBM system, the detection effect of the geological radar method and the transient electromagnetic method in the TBM construction tunnel is poor; the seismic advance detection methods such as TSP and TRT have large equipment, complex device layout, and cumbersome installation. The practicability of the narrow space of the tunnel is not ideal, and it will greatly interfere with the normal construction work of the TBM and affect the construction progress

Therefore, the conventional advanced geological detection technology suitable for drilling and blasting tunnels is difficult to be effectively applied in TBM tunnels

[0004] Aiming at the above-mentioned problems faced by the implementation of advanced geological exploration in TBM construction tunnels, scholars at home and abroad have proposed some solutions, but there are still some imperfections: ① German Geohydraulic Data Company developed the BEAM (Bore-Tunneling Electrical Ahead Monitoring) system, This system is a one-dimensional focused induced polarization detection method. Although it can achieve a certain degree of advanced geological prediction, it is susceptible to electromagnetic interference from the TBM system, the detection distance is short, and the installation and layout of test equipment is cumbersome, which affects the construction progress; ②SSP (Sonic Softground Probing) and ISIS (Integrated Seismic Imaging System) and other methods that use the principle of seismic waves for advanced detection use relatively simple observation methods, which cannot effectively locate unfavorable geological bodies in space, and the spatial resolution of the obtained detection data is also relatively low. Low; ③ domestic invention patents "A Geological Advance Forecasting Method Suitable for TBM Construction", "Device and Method for Roadway Seismic Advance Detection with TBM as Vibration Source" and "Three-dimensional Seismic Advance Detection Device for Rock Breaking Seismic Source of Tunnel Boring Machine" and methods” draws lessons from the seismic detection method while drilling in oil drilling and geological drilling engineering, and proposes to use the vibration generated by the hob on the TBM cutterhead during the rock breaking process as the seismic source for advanced geological detection. However, the area of ​​the TBM cutterhead is huge. And there are a large number of hobs distributed, and the vibration generated by the hobs at different positions is very different during the rock-breaking process, and the hobs break rocks through mechanical actions such as crushing, shearing, and abrasion, and the vibration directions generated are different. , complex frequency components, uneven amplitude, and poor quality of seismic source signals, which greatly increase the difficulty of subsequent analysis and reduce the accuracy of advanced geological prediction

[0005] To sum up, the seismic wave method has advantages in the description of unfavorable geological bodies, spatial positioning, detection distance and anti-electromagnetic interference, etc., but is limited by the unfavorable factors such as the narrow space available for TBM construction tunnels and short idle time. The current seismic wave method is difficult to be effectively applied in TBM construction tunnels. It is a feasible way to use the vibration generated during the rock-breaking process of the cutter head and hob as the seismic source to realize advanced geological detection while digging. The vibrations vary greatly, and the vibration directions, complex frequency components, and uneven amplitudes generated by a single hob breaking rocks make the analysis of subsequent seismic source signals and seismic wave reflection signals extremely complicated, which seriously affects the reliability and accuracy of advanced geological detection

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