Self-anchored opposite-pulling anti-impact anchor cable for sectional coal pillars and using method thereof

    公开(公告)号:US11187081B1

    公开(公告)日:2021-11-30

    申请号:US17072947

    申请日:2020-10-16

    IPC分类号: E21D21/00

    摘要: 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.

    SELF-ANCHORED OPPOSITE-PULLING ANTI-IMPACT ANCHOR CABLE FOR SECTIONAL COAL PILLARS AND USING METHOD THEREOF

    公开(公告)号:US20210396138A1

    公开(公告)日:2021-12-23

    申请号:US17072947

    申请日:2020-10-16

    IPC分类号: E21D21/00

    摘要: 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.

    Determining method for bursting-preventing parameter of roadway support for rock burst in coal mine, and system thereof

    公开(公告)号:US11761335B1

    公开(公告)日:2023-09-19

    申请号:US18311525

    申请日:2023-05-03

    IPC分类号: E21F17/18

    CPC分类号: E21F17/185

    摘要: 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.

    Method and apparatus of controlling drilling for rock burst prevention in coal mine roadway

    公开(公告)号:US11492891B1

    公开(公告)日:2022-11-08

    申请号:US17673544

    申请日:2022-02-16

    IPC分类号: E21B44/00 E21B49/00 E21D9/00

    摘要: 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.

    Coal or rock dynamic disaster warning apparatus and method

    公开(公告)号:US11821317B1

    公开(公告)日:2023-11-21

    申请号:US18120626

    申请日:2023-03-13

    IPC分类号: E21F17/18 E21C41/16

    CPC分类号: E21F17/18 E21C41/16

    摘要: 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.

    Method and system for recognizing mine microseismic event

    公开(公告)号:US11630227B1

    公开(公告)日:2023-04-18

    申请号:US17860297

    申请日:2022-07-08

    IPC分类号: G01V1/34 G01V1/28

    摘要: 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.