ABSTRACT
In Polish conditions of conducting underground hard coal mining in the past, in order to limit the negative impacts of conducted mining, systems with gobs filling with dry or hydraulic backfill were used. In recent years, this method of managing the floor has been abandoned, while as part of fire prevention and in order to enable waste placement in old gobs, caving mining with sealing gobs is used. It seems that this solution also results in a reduction in the amount of surface deformation. The authors presented in the article the results of own research on the subject matter. The research covered the area of one of the mines conducting exploitation in the area of the Upper Silesian Coal Basin. It was determined that the use of exploitation with sealing caving gobs reduces the subsidence coefficient, and the values of the subsidence observed in the analyzed area may be even 25% lower than when conducting exploitation without sealing and the strain extreme values over time can be up to 40% smaller.
