Papers by Keyword: Underground Mine

Abstract: The rope haulage monorail transport system is an important kind of subsidiary transport system in the underground mine. We propose a control system using frequency conversion on rope haulage monorail transport system in this paper, which consists of PLC control console, AC inverter, speed sensor, over-wind protection switch, sound-light alarm, leakage monitoring device, etc. Our control system can realize the start-stop control, the forward and backward control, the frequency conversion control, the over-wind protection, and so on. This control system can also real-timely detect and display the status information of transport system. The field experiments have showed that our control system using frequency conversion can well satisfy the needs of automatic operation of rope haulage monorail transport system.

Abstract: As information technology and communication technology continue to evolve and progress, wireless sensors in communication operations have been widely used in many areas , which has greatly improved the effectiveness and quality of communication and created favorable conditions for the development of all work. In this paper, the author analyzes the corresponding concept of underground mine communication practices and wireless sensors, focuses to discuss the application of wireless sensors in underground mine communication operations and analyzes the design of underground mine wireless sensing system, whose purpose is to provide reference for the application of wireless sensors in underground mine communication operations.

Abstract: To prevent threaten of impact disaster, high-pressure water is injected into coal face, which is most widely used in impact-type mine. In such cases, by analyzing the rock burst tendency of a particular type of deep mining pit and occurrence of the mining process, rock samples drilled from the coal mine were taken for the conventional mechanical properties test and rock burst tendency test respectively under dry and wet state. Cuttings volume indicator affected by injection has been optimized to improve the prediction sensitivity. "One shift anti-impact, two-shift production "patterns labor organization model, adjusted development system layout and cut drilling index optimizations, as well as the allocation of high-pressure water injection drilling means, greatly improving the water injection effect, which probably provide a reference for similar mines to safe and efficiently mining.

Abstract: The length of the pre-splitting crack is an important parameter in underground mine deep-hole blasting, and experience and engineering analogy methods are used commonly, but they seldom have scientific and theoretical basis. In this paper, the mature numerical analysis software — ANSYS/LS-DYNA was adopted, the different lengths of pre-splitting crack were simulated. In the filling body, the corresponding maximum blasting vibration velocity and stress are obtained by numerical simulation when the maximum initiation section blasted. The corresponding regression formulas are obtained by using the least square method, and the optimal length of the pre-splitting crack is 12 m through the calculation. Proved by practice, this method to get the length of the pre-splitting crack is scientific and effective, can be extended in other similar blasting engineering.

Abstract: Base on the RFID technology and CAN technology, the paper designed a underground mine personnel tracking system.[1] With the RFID technology, the personnel with the electric tags can be positioned and identified. The information collected by the writer can be transmitted to the surface with the CAN bus line, personnel’s localization are realized. In practical applications, the system runs well, which achieved good economic and social benefits.

Abstract: In this paper, the process of failure and falling of the rock masses in the underground mining is studied; and the relationship between the processes of failure and falling of rock masses is proposed based on the rockmass strength theory. Research indicates that the failures of the rock and rock masses are probably not at all in common. Even though the rock masses go into the plastic condition, even to the extent that come into being in the failure, they do not surely fall. Hence, the mechanical properties of rock mass, especially after the failure, still need to be further researched. The laneway and the stope in the mining engineering are the temporary engineering, the load- carrying ability of the rock masses should be bought into play as far as possible, and therefore the stabilization during failure process is a significant for the supporting in the underground mine under safety prerequisite. Since 1 million m3 of the mined-out area is formed by mine for many year at Xishimen iron mine in China, and the gob roof is only 54m from the ground, the mined-out area is potentially dangerous to the underground mine. This paper analyzes the pattern of the stability and falling process in the mined-out area based on the theoretical analysis and numerical calculation, in order to obtains the falling criterion of the roof rock masses and stabilize the mined-out area. The predicted falling shape and range of the mined-out area is compared well with the in-situ observations. This contribution has also been popularized in many mines of China.