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To solve the technical cruxes of the conventional system in deep rock mass, an automatic testing system for hydraulic frac- turing that includes a single tube for hydraulic loop, a pressure-relief valve, central-tubeless packers, and a multichannel real-time data acquisition system was used for in-situ stresses measurement at great depths (over 1000 m) in a coalfield in Juye of Northern China. The values and orientations of horizontal principal stresses were determined by the new system. The virgin stress field and its dis- tributing law were decided by the linear regression from the logged 37 points in seven boreholes. Besides, the typical boreholes ar- ranged in both the adjacent zone and far away zone of the faults were analyzed, respectively. The results show that a stress concentra- tion phenomenon and a deflection in the orientation of the maximal horizontal stress exist in the adjacent zone of the faults, which further provides theoretical basis for design and optimization of mining.
To solve the technical cruxes of the conventional system in deep rock mass, an automatic testing system for hydraulic frac- turing that includes a single tube for hydraulic loop, a pressure-relief valve, central-tubeless packers, and a multichannel real-time data acquisition system was used for in-situ stresses measurement at great depths (over 1000 m) in a coalfield in Juye of Northern China. The values and orientations of horizontal principal tears were determined by the new system. The virgin stress field and its dis- tributing law were decided by the linear regression from the logged 37 points in seven boreholes. Besides, the typical boreholes ar- ranged in both the adjacent zone and far away zone of the faults were analyzed, respectively. The results show that a stress concentra- tion phenomenon and a deflection in the orientation of the maximal horizontal stress exist in the adjacent zone of the faults, which further provide theoretical basis for design and optimization of mi ning.