A stress-transfer method in tunnel with high ground pressure based on fracturing ring. According to the stress source of the tunnel, fracturing by drilling holes to form artificial weaken zones in surrounding rocks, that's named fracturing ring. The fracturing ring is the weaken zone with some width, whose inner boundary is the protective circle. The fracturing ring with small width is called the cutting and interruption circle and the cutting or interruption arc. The radius of the protective circle is determined by setting a certain width of safety coal pillar barriers at the edge of a support body. The radius of the fracturing ring is determined by the surrounding rock structure and the stress conditions as well as the construction technology. Usually, the higher the stress, the wider the radius of the fracturing ring. The cutting and interruption circle or arc could cut off all of the targeted rock which transmits the stress.

A system and method for relieving hang-ups, comprising a mobile command vehicle operative to transport a robotic vehicle to a control location remote from a hang-up location; the robotic vehicle operative to advance from the control location to the hang-up location, scan the hang-up location, transmit scanning information to the command vehicle, and receive positioning commands to position the robotic vehicle for drilling into the hang-up location, implant an explosive, and withdraw.

A system and method for relieving hang-ups, comprising a mobile command vehicle operative to transport a robotic vehicle to a control location remote from a hang-up location; the robotic vehicle operative to advance from the control location to the hang-up location, scan the hang-up location, transmit scanning information to the command vehicle, and receive positioning commands to position the robotic vehicle for drilling into the hang-up location, implant an explosive, and withdraw.

The present invention relates to a method for sorting and utilizing coal and rock for a coal and rock combined mining face, and is especially applicable to the sorting and utilization of coal and rock mined from a coal and rock combined mining face when an extremely thin coal seam is used as a protective layer in combined mining of multiple coal seams. Underground gangue transport, storage and filling systems are directly established underground to convey a large amount of coal and gangue mined from the coal and rock mining face to an underground sorting and washing chamber for efficient separation of the coal and the gangue, sorted gangue is crushed and then filled in a mined-out area of a protected layer, thus realizing the environment-friendly cut and fill mining of the protective layer while the gangue is not lifted, and effectively preventing the ground subsidence caused by combined mining of multiple coal seams; sorted middlings are conveyed to a gangue power plant on the ground for power generation through a main conveying system, so that the pressure on mine coal quality is alleviated when benefits are created in the power plant, and thus the average ash content of commercial coal is reduced, and the selling price is increased. The method provided by the invention realizes the efficient utilization of coal and rock while realizing the efficient separation of coal and gangue, and has remarkable economic and social benefits and excellent promotional value.

The present invention relates to a method for sorting and utilizing coal and rock for a coal and rock combined mining face, and is especially applicable to the sorting and utilization of coal and rock mined from a coal and rock combined mining face when an extremely thin coal seam is used as a protective layer in combined mining of multiple coal seams. Underground gangue transport, storage and filling systems are directly established underground to convey a large amount of coal and gangue mined from the coal and rock mining face to an underground sorting and washing chamber for efficient separation of the coal and the gangue, sorted gangue is crushed and then filled in a mined-out area of a protected layer, thus realizing the environment-friendly cut and fill mining of the protective layer while the gangue is not lifted, and effectively preventing the ground subsidence caused by combined mining of multiple coal seams; sorted middlings are conveyed to a gangue power plant on the ground for power generation through a main conveying system, so that the pressure on mine coal quality is alleviated when benefits are created in the power plant, and thus the average ash content of commercial coal is reduced, and the selling price is increased. The method provided by the invention realizes the efficient utilization of coal and rock while realizing the efficient separation of coal and gangue, and has remarkable economic and social benefits and excellent promotional value.

The present invention discloses an apparatus and method for patrol-inspection of a rigid cage channel. The patrol-inspection apparatus comprises a moving member, a transmission member, a driving member, a guide member, and a housing on a main bottom plate. The driving member comprises a tilt sensor and a pressure sensor connected to a microcontroller, the microcontroller is connected to a driver, the driver is connected to a brushless DC motor, and an output shaft of the brushless DC motor is provided with an optical encoder connected to the driver; The moving member comprises a driving output shaft and a driven output shaft, wheel flanges on the driving output shaft and the driven output shaft are each connected with a wheel hub, a permanent magnet is provided in the wheel hub, and a rubber skin is provided on the outer side of the wheel hub; The transmission member comprises a worm connected with the output shaft of the brushless DC motor, a worm wheel on the driving output shaft and meshed with the worm, timing pulleys on the driving output shaft and the driven output shaft, and a timing belt wound on the timing pulleys. The guide member comprises a guide wheel. The present invention increases inspection speed of the rigid cage channel and improves indirectly the production efficiency of the coal mine enterprise.

The present disclosure relates to an automatic system and method for detecting problematic geological formations ahead of tunnel faces. The automatic system includes a data acquisition module configured to acquire data, a data transmission module configured to transmit the data and a control and data analysis module configured to receive and analyze the data and determine the geological formations ahead of the tunnel faces. The data acquisition module includes at least one three-component detector and a processor. The three-component detector is installed in a borehole in a side wall of the tunnel. The data transmission module includes a synchronous communicator and a signal line with shielding properties. The synchronous communicator is connected with the three-component detector via the signal line. The control and data analysis module includes a host and a control and analysis procedure of the host. The host is connected with the synchronous communicator.

A method, system, and computer program product for implementing automated pressure level detection and correction is provided. The method includes retrieving from sensors, measurement attributes associated with geological conditions occurring during a mining process. Subsequently, threshold levels configured to activate an alarm associated with measurement attributes exceeding the threshold levels are determined and code is executed with respect to the threshold levels. A combined threshold severity level associated with the safety threshold levels is determined and code is executed with respect to the safety threshold levels. A combined clustering level associated with the safety threshold levels is determined and a difference value between the combined threshold severity level and combined clustering level is generated. A relationship between the difference value and a threshold value is determined and automated software and hardware control systems are enabled for controlling machinery associated with the mining process resulting in operation of the machinery.

A method, system, and computer program product for implementing automated pressure level detection and correction is provided. The method includes retrieving from sensors, measurement attributes associated with geological conditions occurring during a mining process. Subsequently, threshold levels configured to activate an alarm associated with measurement attributes exceeding the threshold levels are determined and code is executed with respect to the threshold levels. A combined threshold severity level associated with the safety threshold levels is determined and code is executed with respect to the safety threshold levels. A combined clustering level associated with the safety threshold levels is determined and a difference value between the combined threshold severity level and combined clustering level is generated. A relationship between the difference value and a threshold value is determined and automated software and hardware control systems are enabled for controlling machinery associated with the mining process resulting in operation of the machinery.

Provided is a leaching-seepage process of sodium sulfate in a thenardite tailings stack. The process includes the following steps: step 1, providing a mud reserve pit next to the thenardite tailings stack, and ditching a drainage ditch next to a bottom of the thenardite tailings stack; step 2, ditching a leaching pit on the thenardite tailings stack, injecting water, and letting the water stand to leach thenardite tailings; step 3, leaching the thenardite tailings with the water, so that a percolating fluid gradually flows out from the bottom of the thenardite tailings stack; step 4, flushing the bottom of the thenardite tailings stack with a spray gun, to mix the percolating fluid with mud to flow into the drainage ditch; and step 5, settling naturally in the mud reserve pit, and extracting a supernatant from the mud reserve pit by a water pump to obtain refined Glauber's salt water.