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.
G01N 3/10 - Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
G01N 3/06 - Special adaptations of indicating or recording means
2.
Coal or rock dynamic disaster warning apparatus and method
An apparatus for improving the safety and efficiency of underground mining by issuing intelligent warnings of impending coal or rock dynamic disasters includes at least one coal or rock charge probe adaptable to a coal or rock face and configured to detect charge data generated by coal or rock cracking during a mining process, and a monitoring host electrically connected to the coal or rock charge probe and configured to receive the charge data and issue a warning of an impending coal or rock dynamic disaster when warranted by the charge data. In embodiments, the apparatus includes a plurality of channels, and is non-contacting and/or portable.
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. The method quantitatively achieves parameterized model selection of the bursting-preventing hydraulic support of roadway.
Embodiments of the present disclosure provide a method and system for recognizing a mine microseismic event, and belong to the field of mine data processing. The method includes: converting historical microseismic data monitored by a mine microseismic monitoring system into a microseismic waveform image, and then, converting the microseismic waveform image into a four-neighborhood microseismic waveform graph structure; performing area defining on the microseismic waveform graph structure, and extracting a similar feature layer of any node in the microseismic waveform graph structure based on the defined area; and taking the microseismic waveform image as an input layer of an improved convolutional neural network model, and sequentially connecting the input layer with the similar feature layer as well as a convolutional layer, a pooling layer, a fully connected layer and an output layer which are pre-configured for the improved convolutional neural network model to form a recognition model for recognizing the mine microseismic event. By using the recognition model designed in the present disclosure, the similar feature layer can be extracted, so that the mine microseismic event is effectively recognized.
A method for controlling drilling for rock burst prevention drilling in a coal mine roadway is provided. The method comprises: acquiring rock mechanical parameters of coal mass in surrounding rock of a roadway to be subjected to burst-preventing drilling construction, and calculating a surrounding rock critical softening depth, a critical ground stress and a critical mining peak stress for rock burst initiation in the roadway; calculating a critical mining-induced stress index of the roadway to realize quantification of burst risk; then determining critical conditions for drillhole burst and a quantitative relationship between the critical conditions for drillhole burst and for roadway rock burst initiation; quantitatively determining construction parameters of burst-preventing drillholes according to the surrounding rock critical softening depth, a critical plastic softening zone radius for drillhole burst, and the critical mining-induced stress index; and controlling a drilling machine to operate according to the determined construction parameters.
E21B 44/00 - Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systems; Systems specially adapted for monitoring a plurality of drilling variables or conditions
E21B 49/00 - Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
E21D 9/00 - Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
6.
Self-anchored opposite-pulling anti-impact anchor cable for sectional coal pillars and using method thereof
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.
A hydraulic support unit and a hydraulic support for anti-rock burst roadway. The hydraulic support unit includes a base, a top beam, and a hydraulic support column, the top beam is positioned above the base in a spaced manner; the hydraulic support column are disposed between the base and the top beam; a side guard plate and a first base hydraulic cylinder are disposed on the left side and right side of the base, the side guard plates are rotably connected to the base, the two ends of the first base hydraulic cylinder are hinged to the base and the side guard plate respectively, the first base hydraulic cylinder can drive the side guard plate to transit between a horizontal state and a vertical state, and the bottom surfaces of the side guard plates are flush with the bottom surface of the base in the horizontal state.
E21D 15/51 - Component parts or details of props specially adapted to hydraulic, pneumatic, or hydraulic-pneumatic props, e.g. arrangements of relief valves
E21D 15/44 - Hydraulic, pneumatic, or hydraulic-pneumatic props
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