Sensing Device for Active Pressure Drilling Stress Monitoring

By researching the stress evolution law in coal-rock strata, the stability of coal-rock mass is predicted. By analyzing and studying the coal-rock mass deformation principle and coupling contact condition between pressure mechanism and coal-rock mass, there is a linear relationship between measured stress and coal-rock stress. Based on the hydrostatic principle, a drilling stress sensor on active pressure has been developed. Emphasis was placed on the design of strain sensing mechanism. Loading test was conducted in the laboratory, and its basic error is within 0.4% of the total range, which can be regarded as approximately equal. It can be seen that the observed results can accurately reflect the coal-rock mass stress growth trend. It provides realistic data basis for studying coal-rock mass stress state, warning coal-rock dynamic disaster and designing roadway support.