Comparative study on non-on-line seismic while excavating and borehole-blasting method for advanced fault detection

Abstract

Surface drilling and 3D seismic results show that a boundary fault with a maximum drop of nearly 300 m is developed on the east side of the 103 lower 03 working face of a mine in Shandong Province. YTZ3(B) type self-recording seismometer was used to carry out the comparison test of non-on-line seismic while excavating and borehole-blasting method for advanced fault detection in the transportation roadway of 103 lower 03 working face. The non-on-line seismic interpretation showed that the nearest distance between the fault hanging wall and the designed cutting eye was 110 m, the fault plane was relatively straight and the strike was about 62°. The drilling and blasting method is advanced to explain that the nearest distance between the fault hanging wall and the designed cutting eye is 108 m, the fault plane is relatively straight and the strike is about 61°. The test results show that the fault boundaries of non-on-line seismic while excavating and borehole-blasting method are basically consistent with the comprehensive interpretation of ground drilling and 3D seismic. The three independent detection methods verify each other, which improves the detection accuracy of the fault boundary location, and also shows the effectiveness of non-on-line seismic while excavating to detect the fault in front of the roadway.

Keywords

• underground geophysical exploration
• seismic while excavating
• borehole-blasting method
• fault
• advanced detection