Ground-Borehole-Tunnel Seismic Detection for TBM Anomaly Imaging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current seismic wave methods for tunnel construction face challenges in multi-domain time synchronization, incomplete wavefield response observation, interference noise suppression, and integrated imaging of multi-perspective wavefield data, particularly in urban underground tunnels with complex geological conditions.
Innovation Solution
A ground-borehole-tunnel combined fine detection method and system that includes configuring a combined observation mode with synchronized receiving station arrays on the ground surface, tunnel sidewalls, and boreholes, processing seismic signals from TBM rock-breaking vibrations, and performing advanced data processing to integrate and separate wavefields for precise geological anomaly detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If conventional seismic wave methods are applied in tunnels, then detection range is extended, but time synchronization precision between ground surface, tunnel, and borehole observations deteriorates
Solution Approach 1:
A centralized control system acts as an intermediary to coordinate and synchronize the timing of seismic source activation and signal acquisition across all three observation domains (ground surface, tunnel, and borehole), ensuring precise time synchronization despite the distributed nature of the observation network
Solution Approach 2:
The seismic source activation system is designed with multi-functionality, capable of triggering sources in different locations (ground surface, tunnel, borehole) with precise timing control, allowing a single system to handle multiple observation scenarios simultaneously
2Measurement precision
If multi-perspective wavefield data is integrated from ground surface, tunnel, and borehole, then detection accuracy is improved, but wavefield separation and noise suppression difficulty increases
Solution Approach 1:
The complex multi-perspective wavefield data is segmented and processed separately for each observation domain (ground surface, tunnel, borehole) before integration, allowing targeted noise suppression and wavefield separation techniques to be applied to each dataset according to its specific characteristics
Solution Approach 2:
Different processing techniques are applied to different datasets based on their local characteristics - for example, surface wave analysis for ground surface data, transmission wave analysis for borehole data, and reflected wave analysis for tunnel data, optimizing the separation and noise suppression for each domain
3Measurement precision
If TBM rock-breaking vibrations are used as seismic sources, then surface wave data quality is improved, but interference noise from TBM operation increases
Solution Approach 1:
The useful seismic signal components are extracted and separated from the TBM operation noise through sophisticated signal processing techniques, isolating the genuine geological information contained in the rock-breaking vibrations while removing the harmful interference components
Solution Approach 2:
The TBM rock-breaking vibrations, which initially appear as noise, are recognized as containing valuable surface wave information about the geological structure, and processing techniques are developed to extract this beneficial information while suppressing the harmful noise components
4Loss of information
If receiving station arrays are arranged on ground surface, tunnel sidewalls, and in boreholes, then wavefield observation completeness is improved, but system complexity and coordination difficulty increases
Solution Approach 1:
The receiving station arrays are arranged in a nested configuration where borehole receivers are positioned within the tunnel, which itself is within the ground surface observation network, creating a concentric multi-domain observation system that maximizes spatial coverage while sharing common control and processing infrastructure
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables comprehensive, precise, and reliable detection of unfavorable geological bodies ahead of the tunnel face, enhancing detection range and accuracy while minimizing interference, allowing for safe and efficient tunnel construction.
Implementation Method 1
the cutterhead rock-breaking vibration is received by a pilot receiving station for rock-breaking seismic source
Implementation Method 2
a rock-breaking seismic source simultaneously stimulates seismic waves
Implementation Method 3
the seismic waves are reflected after encountering a wave impedance interface, are received by a tunnel receiving station
Implementation Method 4
the seismic waves are received by a far-borehole condition geological drilling receiving station
Data Source
AI summary
A ground-borehole-tunnel combined fine detection method and system, wherein the fine detection method comprises: configuring an ground-borehole-tunnel combined observation mode for tunnel boring machine (TBM) rock-breaking seismic source detection, and carrying out time synchronization and spatial positioning; synchronously acquiring and storing signals by a ground-borehole-tunnel combined detection device when the TBM starts to work; processing parameters in the tunneling process of the TBM and data acquired by a receiving station array to obtain a velocity model and a seismic section of areas in front of and around the tunnel after completing data acquisition; and determining geological conditions of rock masses in front of a working face of the TBM and around the tunnel, based on the obtained velocity model and the seismic section, in combination with the spatial distribution of excavated rock strength indexes and geological drilling data, to realize advanced prediction of geological anomalies.