Application Of High-density Electrical Method In Karst Exploration Of Sewage Treatment Plant

The sewage emergency treatment device project of a city in Guizhou Province is located about 6 km away from the southeast of the urban area of Guizhou Province,on the right bank of a river.The first phase of the project was started in 2013,mainly for the treatment of pollution underground karst conduit water in cave.In the first and second phases of the site where the project has been completed,cracks have appeared on the part of ground surface.Carried out geological and geophysical prospecting work in the area of the emergency wastewater treatment plant project to find out the spatial distribution of underground structures and faults,so as to avoid the hazards caused by geological disasters for the projects and proposed projects.This paper relies on the geological hazard survey project of the Wastewater Emergency Treatment Project.The high-density resistivity method,which has the advantages of strong antiinterference ability and high resolution,was selected to carry out the research on the geological disaster survey project of the wastewater emergency treatment project.Processing the measured data of the high-density resistivity method,combined with the geological survey work carried out,completed the comprehensive interpretation of the geological and geophysical results in the study area,and the main cognitive results are as follows.1 ? 11 low resistance anomalies were delineated in this geophysical survey,including 3 low resistance anomalies caused by surface soil layer and backfill,1 low resistance anomaly caused by surface drainage pipe,1 low resistance anomaly caused by impounded emergency pool,3 low resistance anomalies caused by fault,1 false anomaly caused by river and 1 low resistance anomaly caused by karst There are two.The distribution of the two faults and the basic characteristics of the two karst areas are determined.2?L1 high density profile is located in the west of the river,and its underlying bedrock is relatively complete,so the possibility of further development of geological disasters is low.3?The L2 high-density profile is located in the middle of the sewage treatment project site.From the high-density inversion data,it can be seen that there is a lowresistivity anomaly in the east.Combined with the field investigation,the high-density and low-resistivity anomaly in the east is mainly caused by the sewage sedimentation tank under construction in the sewage treatment plant.4?L3 high density profile is located at the corner of the river,and there are two faults passing through the lower part.Under the comprehensive action of building weight,fault,soft interlayer of bedrock,human engineering activities and river cut erosion,the lower part is seriously dissolved,and the possibility and danger of further development of existing geological disasters are high.5?A total of 3 boreholes were laid on the high-density section L3.The results of the borehole verification are basically consistent with the low-resistance anomaly characteristics inferred by the high-density resistivity method,which proves the correctness of the high-density electrical method used in the study area And practicality.