A variety of physical exploration methods comprehensive physical exploration

1. Purpose of detection

In order to ensure the safety of coal mine production, a mine of Shenhuo Group has adopted the method of combining seismic wave ahead detection (MTRT) technology and drilling logging technology to detect the fault structure in front of the 29020 cuttings and bottom draws. The geological purpose of this exploration is to find out the development of fault structure in front of the 29020 cuttings, so as to provide a guarantee for the safe and effective tunneling of the roadway.

2.On-site construction arrangement
On-site probing work was carried out at the head of 29020 cutting eye bottom drawway in Xuehu Mine, the direction of seismic wave probing was in front of the direction of roadway digging, and the drilling and logging was No.3 geologic hole.

Figure 1 Schematic layout of MTRT measurement points

3. Results of physical exploration

Figure 2 29020 cut eye bottom pumping alley D5 measurement point inward 80m at the comprehensive results of pre-probe map

Figure 3 Map of MTRT probe results

Drill hole logging results map

Figure 4 Comprehensive bar chart of drilled holes

Figure 5 Comprehensive results of drilling

4. Conclusion

(1) The MTRT detection results (MSP depth offset profile at 80m inward from D5 measurement point of 29020 cutting eye bottom draw) show that there are two reflection interfaces in front of the headland, named R1 and R2. R1 is located in front of the headland at 0-7m or so due to the influence of the excavation gunning, and R2 is located in front of the headland at 38-45m or so due to the development of the tectonics.

(2) Drilling logging detection through the video, natural gamma curve, visual resistivity curve, natural potential curve comprehensive analysis of 17.7m see coal 19m over coal, 19.9m see coal 23m over coal, 46.9m see coal collapsed holes have not been detected to the bottom of the hole.

(3) Combined with seismic wave overdetection technology and borehole logging technology, as shown in Fig. 29020, the comprehensive results of overdetection at 80m inward from the measurement point D5 of the bottom drawer lane of the eye cut, the A-seam coal and the B-seam coal are the same layer of coal, which is due to the influence of the R2 interface (fault).