Slope mining

Abstract: The invention discloses an opencast mine end slope near-slope mining method. During an opencast mining process, for integral side slopes of end slopes on two horizontal sides of a mining field, near-border mining is carried out according to a stable angle alpha as in an initial design; according to a timeliness slope principle, inner dump is followed up in time; a pit bottom distance is shortened to a minimal safety distance Dmin required by mining, and integral height H of the side slope of the end slope is reduced; according to a side slope stable condition, the side slope angle is increased to beta; and near-slope mining is realized. The height of inner dump bottom layer slope-pressing step is 2-3 times that of mining working slope step. Stripped soil and rock are transported to the inner dump bottom layer slope-pressing step through a built soil-discharge bridge. With the method provided by the invention, side slope angle can be increased on a basis that slope end stability is ensured. Therefore, end slope residual coal can be recovered; stripping ratio can be reduced; and transportation cost can be reduced.

Abstract: The invention belongs to the technical field of application of coal mining equipment and coal mining methods, and particularly relates to an end slope mining process by using an open-air end slope orecontinuous miner. The end slope mining process comprises the following steps that 101, a mining face is arranged; 102, an equipment mounting and preparation area is arranged; 103, equipment is arranged and mounted; 104, a ventilation system is arranged; and 105, mining is conducted by using the continuous miner. The end slope mining process adopts continuous miner complete set mining equipment, the requirement of mechanized mining of end slope ore is met, the mechanization level of mining of the end slope ore is improved, the production efficiency is greatly improved, the labor intensity of workers is reduced, the stripping volume of rock and soil is reduced, and damage and disturbance to the environment is reduced.

Abstract: The invention provides a method for predicting a distribution rule of ground surface fissures induced by underground mining of a surface mine end slope. The method comprises the following steps of collecting terrain and geology data of a surface iron mine; building an underground mining model of the surface iron mine end slope; determining the parameters of the underground mining model of the surface iron mine end slope; numerical simulation of underground mining: utilizing a three-dimensional discrete element method to calculate the numerical simulation of mining of the surface iron mine end slope, so as to obtain a rock layer and ground surface movement rule; predicting the ground surface fissures. The method has the advantages that the problem of predicting of ground surface fissures caused by the end slope mining from the surface iron mine into the underground mine is solved; a three-dimensional geology model of the rock body of the surface iron mine is established by a three-dimensional geology modeling method, and is divided into a discrete block model suitable for the 3DEC calculation; the distribution scope and type of the ground surface fissures in the underground mining process can be predicted, and the support is provided for the safety production of mines.

Abstract: The invention relates to the field of coal mining, in particular to a method for large circle slope mining of a mining coal face. The method solves the problems existing in the slope adjustment of the prior mining coal face such as process disorder, low speed and low efficiency. The method comprises the following steps: slope adjustment proportion is determined; the working face is divided into sections; a coal mining machine feeds tools alternatively in a machine head and a mining section, the mining section is used as a slope adjustment section at the same time, the displacement space of a scraper-trough conveyer varies between the maximum cutting depth of the mining machine and zero to complete a small slope mining circle of each section, the scraper-trough conveyer is straightened when the last small slope mining circle is completed, and the working face is mined into a step shape; and at last the mining machine adopts an inclined cutting feed mode for cutting triangular coal for the machine head to complete cutting of triangular coal, and thus a large circle slope mining process is completed. The method improves the efficiency and speed of slope mining and production management level during slope mining, ensures safety effectiveness, reduces times for moving the working face, reduces the labor intensity of workers and is widely applicable.