Abstract: With the shortage of land resources, the reuse of lands in the coalmining subsidence areas has increasingly drawn the attention of the public. As a result, the innovative use of these minedout areas, such as, photovoltaic power generation stations, has been proposed. However, the site overall stability of these areas might seriously affects the construction of these facilities, especially, foundations that supporting the transformer substations. Throughout the case study of a specific transformer substation over a minedout area, this paper estimates the loading influence zone above the cavity, the depth of the caving zone and fractured zone. The movement deformation and the stability of site are analyzed and the grouting method treating the cavity areas that can effectively minimize the deformation of the pooling structures are also recommended in the paper.

Key words: Coal Mining Subsidence Areas, Load Influence Zone, Movement Deformation, Stability