TSTEM-1Tunnel Seismic-Transient Electromagnetic Joint Detection System
Product Introduction
The tunnel seismic advanced detection is to use the reflected waves generated by seismic waves in the inhomogeneous geological body to predict the spatial location and distribution of faults, karst caves, soft layers and other disastrous geological bodies in the forward direction of the tunnel (hole) face, and provide petrophysical parameters such as velocity, density, Poisson's ratio and surrounding rock classification parameters of the medium. The transient electromagnetic method uses an ungrounded loop to send a pulsed magnetic field to the ground, and uses a coil to receive the secondary magnetic field generated by the underground induced eddy current to detect the resistivity of geological bodies.
Advanced tunnel forecasting requires accurate detection of the spatial location of undesirable geological bodies such as fracture zones, faults, karst caves, and soft interlayers, and determines the water content characteristics of undesirable geological bodies. Seismic wave method and transient electromagnetic method have their own advantages and disadvantages. Seismic wave method can reveal the spatial location of undesirable geological bodies, but cannot determine the water content characteristics. The transient electromagnetic method has the advantage of high resolution of low resistance and can accurately detect the water-bearing characteristics of undesirable geological bodies such as water-bearing caves, but the transient electromagnetic method is not sensitive to depth, and the inversion calculation is easy to produce multiple solutions, which affects the detection accuracy.
One device and two methods. Brilliant land detection has many years of research and practical experience in seismic wave method and transient electromagnetic method, related products have been widely used in railway, water conservancy, geology and mining industries, combined with the advantages of the two methods, Brilliant land detection and innovative development of TSTEM-1 tunnel seismic-transient electromagnetic joint detection system, in a set of equipment to integrate two different detection methods, data joint processing, to achieve seismic joint high-precision tunnel advanced detection.
Related products
Product composition:
(1) TSTEM-1 seismic and electromagnetic joint detection host;
(2) Three-component direct-coupled detector
(3) Electromagnetic shielding coil
(4) Lithium battery
(5) Three-party notebook data collection terminal
(6) seismic and electromagnetic joint data processing software
· Technical indicators of seismic method
(1) Sensor: frequency band 1 Hz-5 kHz, sensitivity 2.5 V/g;
(2) Shock source: electromagnetic rampage source, explosives, hammer strike optional
(3) Probe: direct coupling, fast installation, good signal quality, no consumables
(4) Trigger: wireless synchronization
(5) Positioning: wireless, random observation system
(6) Transient electromagnetic inversion interface
(7) Sampling: sampling interval 5.2 μs, dynamic range 126 dB
(8) Collection: high-power WIFI, away from explosives, safer construction
(9) Software: process operation, intelligent interpretation
(10) The forecast distance is 100 m, few accessories, light weight, safe and efficient
· Technical indicators of transient electromagnetic method
（1）Detection depth: 100 meters;
（2）Real-time dynamic range: 150dB;
（3）Sample rate: 1.25 or 2.5MHz;
（4）Transmit current: 60A;
（5）Transmission frequency: 50, 25, 12.5, 6.25, 3.125, 0.78125, 0.390625Hz (optional);
（6）turn-off technique：stabilizing voltage clamping high-speed turn-off technique
（7）Turn-off time: less than 60μs (coil 0.9m diameter)
（8）Working temperature: -30°C~60°C, maximum relative humidity of 95%;
（9）Standard coil: 0.9m Directional shielding coils;
