Experimental study on law of surface subsidence under the condition of large mining depth and thick bedrock

Abstract

In order to study the law of surface movement and deformation under conditions of aeolian sand cover, thick bedrock and large mining depth in Ordos Area, a surface movement observation station was carried out on the corresponding surface of Muduchaideng 30201 and 30202 working faces. After collating and calculating the measured data, surface subsidence characteristics under this geological mining condition are analyzed. Results show that, due to the large mining depth, surface subsidence basin is characterized by smaller edge slope, gentler edge slope and less obvious “basin-shaped” basin. Due to the influence of many groups of thick and hard sandstone layers, the boundary angle value is small and the influence range of surface subsidence is large. The deformation intensity is mainly concentrated in the mining working face corresponding to the upper surface.

Keywords

• observation station of surface movement
• surface subsidence
• large mining depth
• subsidence calculation parameter
• angular parameter