Application of High-Density Electrical Resistivity Imaging to Karst Collapse Investigation at the Taiyangcun Town,Liuzhou
ZHENG Zhi-jie;ZENG Jie;GAN Fu-ping;ZHANG Wei;LU Xiu-hua;Institute of Karst Geology,Chinese Academy of Geological Sciences;Karst Dynamics Laboratory,MLR&GZAR;
In order to clarify the geological background of karst collapse at the Taiyangcun town,Liuzhou,we conducted electrical resistivity imaging to investigate the collapse area. The results indicate that electrical resistivity imaging can preferably determine the thickness of soil layers,the interface between soil and rock,and the position of the karst fissure zones. Combined with geological data,it also has a better effect in the identification of fracture zones. It is found that the geological backgrounds of the three collapse areas are different. The first and third collapse areas are closely related to human activity,which are respectively induced by well pumping and oil pipelines. However,the geological background of the second collapse area is closely related to natural factors including the fracture zone. It can more accurately determine the latent hidden danger of collapse by electrical resistivity imaging inversion. Hidden areas in the first collapse area are nearby the EW karst fissure zone which contains pumping wells. Hidden areas in the second collapse area are the karst fissure zone on the west side of the fault. Hidden areas in the third collapse area are the near SN to EW karst fissure zones on the east side of the oil pipeline,which are all located in the vicinity of human activity and structure- rich zones.