5results about How to "Safe and Efficient Mining" patented technology

The present application relates to the field of data processing, and provides a rationality evaluation method, device and equipment for hydraulic support selection, the method comprising: obtaining multiple monitoring indexes of the hydraulic support, and determining original indexes according to the monitoring indexes; the monitoring indexes include initial support force, step sequence final resistance, safety valve opening pressure, safety valve opening time, column subsidence, roof beam deflection angle and impact acceleration; the original indexes are normalized, the obtained standardized data is input into a trained neural network model, and a rationality prediction result is output; the rationality prediction result is scored based on a target function to obtain a score result, and the rationality grade of the hydraulic support selection is determined according to the score result. The present application solves the problem in the prior art that the evaluation of hydraulic support selection relies on a single static index and lacks dynamic multi-dimensional comprehensive analysis, realizes intelligent comprehensive evaluation based on multi-source monitoring data, and improves the rationality and accuracy of selection.

This invention relates to the field of coal mining technology, specifically to a method for large-area gas control. The method comprises the following steps: delineating the boundary of the large-area gas control zone; using a TBM (Tube Milling Machine) to excavate a boundary roadway starting from the center of the boundary of the large-area gas control zone; excavating a connecting roadway within the area enclosed by the boundary roadway; drilling a through borehole within the coal seam area enclosed by the connecting roadway and the boundary roadway; and using fracturing and extraction technology to extract gas within the through borehole. Utilizing the rapid roadway construction advantage of the TBM, long-distance, high-efficiency rock breaking operations can be achieved, improving the mechanization and intelligence level of the working face. Following drilling and gas extraction, compared to traditional mechanized mining and blasting, this method significantly reduces disturbance to the surrounding rock, lowers the probability of coal and gas outbursts, effectively improves gas control efficiency, and enables safe and efficient mining of deep coal resources, effectively solving the corresponding technical problems existing in the prior art.

The application discloses a green pressure relief method for mine pressure appearance caused by multi-coal seam mining residual coal pillars and belongs to the technical field of multi-coal seam mining. The intelligent decision system of multi-source data fusion is used to solve the problem of response lag of the traditional method. The coupling process of supercritical CO2 gas expansion pressure relief and biodegradable hydraulic fracturing technology is adopted to realize low pollution and coal pillar structure protection in the pressure relief process. Through the whole-process closed loop of "monitoring-prediction-decision-verification", the problem of multi-coal seam stress superposition control is broken through, and the method is especially suitable for the complex geological environment of mine pressure appearance caused by multi-coal seam superimposed mining.

The application discloses a kind of based on injection flow dynamic monitoring's multiple cracks synchronous perforation interval optimization adjustment method, including rock sample test piece, high temperature-high pressure flow monitoring meter, data acquisition etc..Method includes the following steps: setting temperature, confining pressure and injection flow rate;Record perforation interval;Record analysis multiple crack propagation path;Establish the relationship between crack propagation path and injection parameter;Determine the optimal perforation interval under certain temperature, pressure, injection flow rate.The optimization adjustment method of the application can obtain the multiple crack synchronous cracking propagation law of rock mass under THM coupling state on the basis of specific test research, fundamentally reveal the synchronous cracking propagation control mechanism of rock mass multiple crack from "non-equilibrium" to "equilibrium" transformation under stress shadow effect, and the determination of best perforation interval in specific engineering practice can not only greatly improve coalbed gas production, realize safe and efficient exploitation of coalbed gas, but also greatly reduce the investment of early cost.

The application discloses a kind of ten million tons intelligent fully mechanized working face top coal ground fracturing regulation methods, applied to coal mine well mining technical field. Including the following steps: analysis coal seam and the initial state of top coal, establish the relationship between coal seam pressure capacity and pressure;Coal seam and coal flow dynamic model, build the differential relationship of coal flow dynamics;Establish the optimization model of top coal rate, optimize intelligent top coal strategy;Implement ground fracturing technology, establish the model of ground fracturing pressure change;Real-time monitoring and adjusting top coal pressure, establish the coupling model of top coal stress and top coal rate;Intelligent regulation system feedback and adjustment, establish feedback regulation control model;In the process of coal flow and top coal pressure regulation, establish the coupling relationship of coal flow and top coal;The effectiveness of the model is verified by numerical simulation, and the parameters are adjusted according to the actual situation, finally realize the comprehensive regulation and optimization of coal flow and top coal.