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At a source-receiver offset of 12m, the intensity of the seismic waves (the circled part) between 55-60m and 106- 122m on the survey line increases. The features of offset and bending of the seismic wave’s same-phase axis, as well as the increase in the number of seismic wave phases, match the characteristics of seismic wave propagation in void areas. The anomalies are most pronounced, indicating the optimal source-receiver offset, and it is preliminarily inferred to be a void area. By comparing, it can be seen that the results obtained from the seismic imaging method are in complete agreement with the high-resistance anomalies shown by the high-density survey line. It can be concluded that the top burial depth of the first void area is about 13m, and the second void area is about 11m deep. This shows that the multi-source offset seismic reflection method is effective for detecting void areas.
Taking a survey of karst ground collapse and ground subsidence geological disasters in a certain area as an example, this introduces the application of the engineering seismic reflection method in the investigation of karst ground collapse and ground subsidence geological disasters. The purpose of using the engineering seismic reflection method is to essentially ascertain the structural trend, burial depth, and its developmental degree within 70m underground in the surveyed area, providing a basis for the next step in the treatment of the geological disaster
The anomaly on this survey line is attributed to a fault, contact interface, or fracture zone anomaly, located at 820m. The anomalous feature is the discontinuity of the reflection wave’s same-phase axis, and the cause of the anomaly is inferred to be the F9 fault. The verification borehole number is ZK1004, where structural conglomerate rock was observed at a depth of 23.20-23.80m. The test results confirm that Anomaly A is caused by a fault.
The anomaly in this section is attributed to soil holes and karst (including loose collapses), located at 230
-240m. The anomalous feature is that the reflection wave exhibits low amplitude and long periods, and the cause of the anomaly is inferred to be a rock (soil) hole. The verification borehole number is ZK3014, and the drilling test result shows an unfilled karst cave at a depth of 19.85-21.90m. The shallow seismic reflection inferred C karst cave anomaly is confirmed by the borehole.
