Stress Simulation Analysis Of F22Fault Structure Zone In Huainan Zhuji Mine

Zhuji mine has complex geological structure, fold and fault distribution densely, and coal buried deep, which increases the difficulty of coal mining. The F22fault is the most important thrust fault in the mining area. In order to exploitation of the footwall coal resources safely and efficiently, we must stress distribution on the fault structure area do fully understand, which is the purpose of this study.The paper main collects the geological data of the mine engineering geological conditions, hydrogeological conditions and exploration period. Based on the analysis of the drilling exploration area of well logging, geophysical properties of the strata are the basic judgment. As the fault of F22as the boundary, the hanging wall of the fault mainly shows low resistivity, high natural gamma logging characteristics, and The footwall shows high resistivity, low natural gamma logging characteristics.What’s more the natural potential surrounding F22fault is obvious negative anomaly.Based on understanding the geological conditions in mining area, the paper also by reading literature focus on understanding of hydraulic fracturing, the acoustic emission method and logging method about ground stress measurement technique. This paper also understand the various methods of the test principle, test equipment, test system and test method, and the summarized the accuracy and application range of various methods for solving the stress, and the advantages and disadvantages of various testing methods.Last, the paper use the Flac3D finite difference software to simulate the ground stress distribution of F22structure zone. The results showed that:Faults have changed the original distribution of stress.Near fault zone appeared abnormal stress, and the stress concentration phenomenon in hanging wall of the fault is more obvious than footwall. At the same time, with tunnel excavation distance closer with fault, the stress change is more obvious. This conclusion provides a theoretical reference for the design and timbering about excavation tunnel.