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TRT-V8000 Tunnel Seismic Prediction
· Tunnel TRT technology for generating a 3D holographic map of the geological structure ahead of the tunnel
· Accurate, comprehensive, and intuitive survey results with easily interpretable features such as faults, fractures, water-rich zones, karst and voids
· Zero consumables with low testing cost
· Wireless connection system for simple, safe, and portable operation
· Short test time without impacting tunnel construction
· Wide applicability: suitable for underground engineering such as railways, highways, water conservancy, and mining with long detection range (100-300 meters)
Introduction
The TRT-V8000 Tunnel Seismic Prediction System employs tunnel seismic reflection tomography technology. The core principle is that seismic waves reflect off interfaces with acoustic impedance differences when they encounter geological strata or discontinuities.
Seismic source and geophones layout
Specifications
- Integrated host: integrated field data collection and display function, real-time waveform display, data collection superposition, protection level IP66
- True 3D imaging: 10 geophone three-dimensional arrangement
- Vibrator source: The data quality is higher, the forecast distance is longer and more accurate
- Simple and convenient: two transport boxes, easy to carry, wireless data transmission, no need to punch holes, easy to install on site
Parameters
Specifications
Frequency range
100-3000Hz
Dynamic
force
1110 N
Spirit
sensitivity
±5g
Damping
force
2220 N
Temperature
range
-20 ~ 100 °C
Sensor frequency
range
1-8000Hz
Analog to
digital conversion
24 bits
Dynamic
range
144dB
Weight
4.8 kg
Sampling
frequency
250-32000 channels/second
Vibrator source & Hammer source (Sledgehammer)
The TRT-V8000 system provides two choices of sources: vibrator source and hammer source. The vibrator source generates energy through an industrial vibrator that produces frequency-sweeping source from 100Hz to 3000Hz. The hammer source generates energy through hammer strikes. Both can be used as seismic sources to determine underground structures. However, the controllable source is able to generate higher resolution images in a shorter period of time.
The frequency-sweeping source has been successfully applied in new Austrian tunneling method (NATM) tunnels, TBM tunnels, and mining adits, with applications in multiple tunnel projects including Japan, UK, China and South America.
In a project in Brazil, 40 tests were conducted in a 3km long TBM tunnel, with each test forecasting an area of 200m ahead of the tunnel face. An accuracy of approximately 90% was achieved in detecting anomalies ahead of the tunnel face.
The above tests were specifically used to detect major water-bearing zones within granite. The first water anomaly was detected at around 175m ahead of the TBM, while the second was detected at 51m ahead of the face. Excavation confirmed the presence of a water flow of about 3000 L/min.
