Ground Stress Measuring Technology with Casing Fracturing Method in Deep Mine

Abstract：In order to easily and rapidly measure the insitu rock stress in the deep mine and improve the measuring accuracy,the paper had a study on two ground stress measuring modes with the casing fracturing method and they were the single hole casing fracturing method and the controlled fracturing method.The analysis showed that due to the restriction of the main stress difference,the application the casing fracturing method would have certain limitation and the measurement and test of the controlled fracturing method would require a three directional controlled fracturing operation and the workload would be high.Thus the two methods were combined and a parallel drilling casing fracturing method was provided for the ground stress measurement.The parallel drilling casing fracturing method would have the rapid and simple features and would apply the FLAC3D software for the numerical calculation analysis.The results showed that the calculation results of the theoretical formula would be 0.89~1.00 times of the numerical calculation results.Those two results would be basically fitted.The effectiveness of the method was approved.