There is a good agreement between the prediction results of the cave and the borehole by the fretting detection, which makes up the blind area of geological information between the boreholes.

The shield traverses the karst area and uses the fretting technique to invert the formation structure to realize the accurate location of the karst cave, which is highly consistent with the late drilling.

Based on the precise location of the cave, the scale prediction can be realized, which is in good agreement with the late drilling.

Compared with other engineering geophysical exploration methods, SmartSolo Scientific microseismic survey system has the following four advantages:

First, no damage to structures or underground pipe network;

Second, not restricted by the site, strong anti-interference ability, data distortion;

Third, high construction efficiency, low cost;

Fourth, green environmental protection.

In the technical link, the optimal coupling mode is determined by using the SmartSolo Scientific high-precision three-component seismic data acquisition instrument (IGU-BD3C-5) through data acquisition for micro-motion detection. The stable 7-node circular array observation system is designed to improve the data stability effectively. Develop the field data acquisition system and standards that can be collected, meet the detection depth, and ensure the accuracy and reliability of data; Real-time data transmission, on-site quality control, abnormal data screening. After data processing and geological interpretation, the final detection results are obtained.