Formation conditions and mechanisms of karst subsidence: A case study of Huangzhuang village in Tangshan

In order to evaluate the geological conditions and the mechanisms of karst collapse in the Tangshan area, the impacts of karst geology, lithology and hydrogeological conditions on karst collapse in the region were evaluated using integrated geophysics means, borehole drilling technology, groundwater long-term observation, etc. Geological conditions, mechanisms of surface karst collapse, collapse forecast and development trends were investigated using two-dimensional and three-dimensional Electrical Resistivity Tomography (ERT) data.The distribution of karst collapse on a three-dimensional scale, the underground flow channel and the basement distribution were also evaluated. It is included that karst collapse mainly takes place in areas with extensive cone of depression zones and underground flow channels, the locations in which main flow channel and in particular with frequent interaction with surface water, which often occurs in the rainy season. The study of karst collapse using three-dimensional ERT data and three-dimensional inversion technology help characterize the karst development and the quaternary aquifer.