Floor Heave

The main objective of researches was establishment of the reasons of a floor heave
and failure of gateroad during the mining of Polenovsky seam in the mine of S.M.
Kirov in the Kuznetsk coal basin. In paper results of measurement of floor heave, rooflowering
and convergence of ribs are presented. Relationships of a floor heave and
the location of a longwall face are shown. The defining influence of depth and high
rock pressure zones from the interpanel pillars left on overlying Boldyrevsky seam is
established. Recommendations about a floor heave exception in the geological and
mining conditions of the mine of S.M. Kirov are made

The main objective of researches was establishment of the reasons of a floor heave and failure of gateroad during the mining of Polenovsky seam in the mine of S.M. Kirov in the Kuznetsk coal basin. In paper results of measurement of floor heave, roof-lowering and convergence of ribs are presented. Relationships of a floor heave and the location of a longwall face are shown. The defining influence of depth and high rock pressure zones from the interpanel pillars left on overlying Boldyrevsky seam is established. Recommendations about a floor heave exception in the geological and mining conditions of the mine of S.M. Kirov are made.

The purpose of this study is to research the peculiarity of the floor heaving in the belt entry of the 8th western longwall m3 coalbed of Abakumov Mine of the state enterprise “Donetsk Coal Energy Company”. Floor heaving occurred up to 2.1 m and caused in such a way this extra work is such as ripping and retimbering in the belt entry. The amount of floor heaving was approximately 0.4-2.1 m along the whole entry. In such a way it caused the extra work which includes ripping and retimbering in the belt entry. It’s giving a rise to financial problems and labour costs.
This situation has been studied by instrumental observations. Three monitoring station were built along the belt entry of the 8th western longwall m3 coalbed. The results of monitoring made it possible to determine that floor heave has occurred through four stages. They have been divided by features of floor movement and its deformation. Hard stratum floor has been discovered to be a major feature of floor heave. It is established that floor heave occurs with a longitudinal asymmetry incurvation which vertical axis is tilted towards the goaf at an angle 35-50°.
The adopted protection methods at Abakumov Mine do not provide the belt entry of the 8th western longwall m3 coalbed with stability. So, for better understanding, a further research will be focused on the reasons and developing protection support methods for controlling floor heave. Study will be carried out in order to keep the floor displacement in the acceptable limits in accordance with safety rules.