Failure analysis of super-large mining height powered support.

In order to study the support failure mechanism of a super-large mining height powered support, a mathematical model of the load carrying capability area (LCCA) under various loading conditions for the support was established. A certain type of support was considered as an example, and the distribution characteristics of the LCCA were analyzed. According to the results of theoretical analysis, a dynamics numerical simulation model based on the ADAMS software was developed. The response of the support was observed under conditions of various loading intensities and positions. The simulation results demonstrated that deviation of the roof load from the optimal equilibrium area (OEA) was the key reason for the support failure. Subsequently, the factors affecting the OEA of the support were analyzed and the analysis result appraisal was executed by the load carrying capability theory. The results demonstrated that optimization of the structural parameters of the powered support was reasonably conducive to the range expansion of the OEA. Therefore, the support failure tendency could be reduced. The research results were useful in the structure optimization of the powered support, thus improving the corresponding reliability and stability. [ABSTRACT FROM AUTHOR]