43results about How to "Guarantee mining safety" patented technology

The invention discloses a subsection-studding all-open-stoping backfilling collaborative mining method. A panel ore block is divided into primary studdings and secondary studdings; a retrusive mining working mode that the mining is carried out out at intervals, the secondary studdings are mined and then the primary studdings are stoped is adopted; when each secondary studding is stoped, a certain thickness of an ore body is reserved on the top of the ore body and is used as a temporary protection layer; a drilling drift is arranged in each primary studding and is used for drilling the top ore body and the ore body of the primary studding; meanwhile, the drilling drift has a function of filling the drift, the function of filling the drift is achieved by a goaf of a low-level secondary studding; a filling hole is formed in the wall of the drift and is used for immediately filling the goaf of each secondary studding; a large-size stope structure parameter is designed in the ore body; a production mode of mechanical mining work is adopted; a drill jumbo is used for drilling, and a scraper discharges ores, so that the safety and high-efficiency mining is realized. The subsection-studding all-open-stoping backfilling collaborative mining method disclosed by the invention is high in ore recycling rate and high in safety under the condition that a roof surrounding rock is unsteady.

The invention relates to a method for measuring cranny evolvement of a mining coal-rock mass. The method comprises the following steps of (1) determining a coal layer needing the gas governance and distributing measuring pores; (2) inputting a three-dimensional coordinate of the center of the opening and the bottom of each measuring pore into a computer; (3) installing an essence safety-type drilling imaging instrument into each measuring pore, and collecting wall video information in different depths of each measuring pore by utilizing the imaging instrument in the coal mining process; (4) converting the collected wall video information in different depths of each measuring pore into a wall unfolded binary image of each measuring pore, and calculating fractal dimension of a crack network of each measuring pore; (5) classifying the fractal dimension of the crack network of the measuring pores which are in identical distance to a coal mining working surface into one group, and averaging each group of fractal dimension to obtain the average fractal dimension of the coal-rock mass crack network which is differently distanced to the coal mining working surface in the advancing process of the coal mining working surface.

The invention relates to the technical field of combustion water heaters, and relates to a roof contact method for stope filling. The roof contact method for the stope filling comprises the followingstep that a stope empty area is filled with slag to a certain height to obtain a residual empty area, the height of the residual empty area is measured, the position of the highest point is determined, a hollow anchor rod is installed at the highest point, and a filling pipe is installed on the hollow anchor rod; a first dewatering pipe and a dewatering pipe are installed at the highest point, anda third dewatering pipe and a second dewatering pipe are installed from top to bottom according to the height difference; and the opening between the residual empty area and an inlet or a connectingchannel is blocked, and then filling slurry is conveyed into the filling pipe to realize roof-contacted filling of the residual empty area. The roof contact method for the stope filling has the characteristics of realizing effective roof-contacted filling of the stope empty area, and effectively ensuring the strength of the stope empty area.

The invention discloses a design method of a shearing test for the size effect of an anchored structural plane. The design method comprises the following steps that: (1) a concrete specimen is prepared according to an indoor test principle, and the specimen is a cuboid; (2) a direct shearing test is conducted on the specimen through a large direct shearing apparatus, shearing stress and displacement information are monitored in the test process, and the shearing strength of the anchored structure plane is obtained; (3) a functional relationship between the shearing strength and the size is obtained by enlarging the size of the structural plane sequentially; (4) a functional relational expression between the shearing strength and the inter-row spacing is obtained by enlarging the inter-rowspacing of an anchor rod sequentially; (5) a functional relational expression between the shearing strength and the diameter is obtained by enlarging the diameter of the anchor rod sequentially; (6) the three functional relational expressions are analyzed mathematically by using MATLAB software; and (7) anchoring parameters of a high and steep rock slide slope are designed. According to the designmethod, the accuracy and the scientificity of the shearing strength value of the structural plane can be improved, a safety factor of the high and steep rock slide slope is increased, and meanwhile the problem of material waste caused by unreasonable anchorage design is avoided.

The invention provides a gently inclined medium-thick-thick large ore body remaining ore stopping method which is applicable to stopping of gently inclined medium-thick-thick large ore body remainingore with a high ore grade and a high value. According to the method, firstly, an original room-and-pillar method goaf is filled with a high-intensity cemented filling body; and during filling, a vacant area being 1.5 to 2 m on the top is reserved to be used as a free surface and a compensation space for upper layer ore body stopping. According to the thickness of an upper layer ore body, a shallowhole room-and-pillar method or a point pillar type upward layered filling method is used for stopping the upper layer ore body according to different conditions, and roof-contacted filling is performed; and then, an upward layering drift-and-fill method is used for stopping a lower layer ore body. Compared with the prior art, the gently inclined medium-thick-thick large ore body remaining ore stopping method has the advantages of safe stopping operation, high ore recovery rate, low dilution rate, maneuverability, flexibility and the like.

The invention provides a gently inclined minded-out area roof and floor residual ore stoping method. The method is suitable for the stoping operation of gently inclined minded-out area roof and floorresidual ore with high ore grade and good value. A carry-scraper ore output hopper bottom structure is arranged in foot wall rock, a lower-layer ore body is firstly stoped, then an upper-layer ore body is stoped, and finally a minded-out area is filled. When the lower-layer ore body is stoped, an upper old mined-out area is regarded as a free surface and a compensation space, a fan-shaped middle-deep hole is adopted to collapse ore, a part of the ore is output from the inside of the carry-scraper ore output bottom structure, then the fan-shaped middle-deep hole is adopted, a lower mined-out area is regarded as a free surface and a compensation space, the upper-layer ore body is collapsed, collapsed ore is completely output in the carry-scraper bottom structure, and then the mined-out areais filled with a low-strength cemented filling body or a non-cemented filling body. Compared with the prior art, the method has the advantages of safe stoping operation, high stope production capacity, low cost and the like.

The invention provides a method for inversely calculating the direct roof thickness based on the stress of a fully mechanized hydraulic support, which relates to the technical field of mining engineering. The method comprises the following steps: A. obtaining the structure and support parameters of the fully mechanized hydraulic support; installing a pressure monitoring sub-station of the fully mechanized hydraulic support; B. Analyzing the force on the top beam of the fully mechanized hydraulic support, establishing the moment balance equation centered on the connecting point of the top beamand the shield beam of the support, and obtaining the force on the top beam of the support by the roof of the fully mechanized stope; C. measuring and recording that work resistance of the fully mechanized mining hydraulic support, generating a curve of the end-of-cycle resistance and the pushing-mining distance, and calculating the average value of the working resistance of the support from the end of the roof pressure to the time of re-advancement; D. Solving the direct roof thickness according to the force balance equation of the roof beam of the fully mechanized mining hydraulic support when the roof is pressed and pushed again after the working face is finished. The method solves the problem of determining the direct roof thickness accurately under the fully mechanized mining condition, and has high coincidence with the engineering practice, strong adaptability to the roof strata change, accurate results and small error.

The invention relates to a NO2-absorption-characteristic-based drill rod feeding depth measuring system of a coal gas drilling machine. The system comprises a hole sealing module and a cavity ring-down NO2 concentration module. The hole sealing module includes a flat sealing plate, an annular sealing O ring, a small ventilating hole, a ring-down cavity leather hose connecting end, a sample gas leather hose connecting end, and a coal rock fixing member and the like and is used for sealing gas in a drilled hole and controlling inlet or outlet of NO2 gas. The cavity ring-down NO2 concentration module is used for measuring the diluted NO2 concentration. A high-oncentration NO2 sample gas, a flow control valve and a sample gas solenoid valve are used for inputting quantitative high concentration NO2 into the hole; an intake solenoid valve, a filter membrane, an inlet end and an outlet end are used for providing gas in the hole for the cavity. The system belongs to the field of the post-drilling measurement technique. With the cavity ring-down technique, the diluted NO2 concentration in the hole is measured and thus the depth of the hole is deduced, so that the influences of the complicated underground environment and collapsed hole are eliminated and the measurement accuracy is improved.

The invention discloses a tangential loading method for a super-large rock mass structural plane shear test based on Lorentz force. The method is characterized in that according to shear instability data of a large rock mass structural plane, physical and mechanical parameters of wall rock and the structural plane of the super-large rock mass structural plane shear test are determined after statistical analysis, a cuboid steel mold is adopted for pouring a concrete lower sample of the super-large rock mass structural plane, and an upper sample is poured according to the same method; high-frequency current coils are arranged around an upper sample and a lower sample, and the magnitude and the direction of the Lorentz force are adjusted by changing the magnitude and the direction of currentin the coils; the determined data of the current in the high-frequency coil is inputted into an intelligent computer, and the magnitude and the direction of the current in the high-frequency coil arecontrolled through a current sub-controller; in the test process, the optical fiber current sensor is stressed to deform under the action of a tangential load, data is transmitted to the intelligent computer through the optical fiber channel, and a tangential load of the shear test is corrected. The method is advantaged in that accuracy and scientificity of test results are improved.

The invention discloses a settlement-limited stoping method for a false mined-out layer support formed in combination with a rock gangue, and relates to the technical field for prevention and controlof mining engineering stoping and surface subsidence. The method comprises the following steps of: matching a rock stratum with a gangue by reinforcing a grout, providing an output pipe on a partitionin a ganguelayer through using stopping, footage and caving time difference, the gravity downflow of the grout and spatial crack rules of the gangue, injecting the grout in a collapsed roof rock layer to form a stable support false layer arranged in sections, and matching with an erected dense and thin wall for ventilation, wherein a first working face adopts b-shaped mining, and the subsequent working faces adopt p-shaped mining; and after a reserved phased roadway is initially collapsed, a reserved liquid supply pipe is used to pour the suspended space of the roadway to form a complete false mined-out layer, and the stratum subsidence and stope water accumulation can be controlled. The stopping method reduces the tunnelling workload of the working face, and can control the surface settlement effectively, and the mining of mineral resources can be completed under the conditions of low cost, high recovery rate and environmental protection.