Abstract: The present disclosure relates to the technical field of loading test devices, relating to a test device for arbitrarily directional combined loading and a method for using the loading test device. The device includes a test bench base assembly and a loading assembly. The loading assembly is arranged above the test bench base assembly. The loading assembly includes a loading oil cylinder and a swing base. The swing base can rotate with respect to the loading base, such that a direction of the loading oil cylinder can be adjusted to meet requirements of different loading angles. The test bench base assembly includes a first chute, and the loading base is connected to the first chute via a sliding fastening bolt.

Abstract: A model selection method for a hydraulic support includes: determining a surrounding rock-support mutual feedback equilibrium curve under a first equivalent in-situ stress and a surrounding rock-support mutual feedback equilibrium curve under a second equivalent in-situ stress, according to the first equivalent in-situ stress, the second equivalent in-situ stress, a stress of a fracture zone on a softening zone under the first equivalent in-situ stress, and a stress of the fracture zone on the softening zone under the second equivalent in-situ stress; determining a support strength of a to-be-selected hydraulic support on the surrounding rock and a minimum expansion and contraction quantity required by a movable column according to the equilibrium curves; determining the residual burst energy that needs to be absorbed by the hydraulic support; and determining the hydraulic support matched with roadway.

Abstract: The present invention discloses a self-anchored opposite-pulling anti-impact anchor cable for sectional coal pillars and a using method thereof. The anchor cable includes a steel strand (100), with an energy-absorbing and yielding terminal (200) and a stressed expansion-cracking terminal (300) respectively fixed to two ends of the steel strand, a bushing (400) sleeved outside the steel strand, a first lock (610) provided at one end of the steel strand and a second lock (620) provided at the other end of the steel strand; the stressed expansion-cracking terminal includes a self-anchored bushing (420) with a plurality of pre-splitting lines (440) arranged in the wall of the self-anchored bushing. Under stress, the wall of the self-anchored bushing cracks along the pre-splitting lines and bends and expands, so that it abuts against and is self-anchored to the edge of a sectional coal pillar at the outer side.

Abstract: The present invention discloses a self-anchored opposite-pulling anti-impact anchor cable for sectional coal pillars and a using method thereof. The anchor cable includes a steel strand (100), with an energy-absorbing and yielding terminal (200) and a stressed expansion-cracking terminal (300) respectively fixed to two ends of the steel strand, a bushing (400) sleeved outside the steel strand, a first lock (610) provided at one end of the steel strand and a second lock (620) provided at the other end of the steel strand; the stressed expansion-cracking terminal includes a self-anchored bushing (420) with a plurality of pre-splitting lines (440) arranged in the wall of the self-anchored bushing. Under stress, the wall of the self-anchored bushing cracks along the pre-splitting lines and bends and expands, so that it abuts against and is self-anchored to the edge of a sectional coal pillar at the outer side.