Surrounding Rock Control Technique Of The Soft Coal Fully Mechanized Face With Greater Mining-Height

Currently, the fully mechanized coal greater mining primarily in hardware, roof under good conditions. The surrounding rock control theory and technology is not enough to guide effectively the difficult conditions of high security and exploitation of greater mining. In particular, under complicated geological conditions Zhaozhuang soft coal mining a greater high-mechanized mining,Jincheng Coal Mine. As the coal seam faults, fissures, joints, folds and other tectonic development, resulting in a slower advance of working face (the most slowly reached 18.5m / month),a greater quantity of roof subsidence; due to a lower carrying capacity of soft coal,coal wall Tablets to help serious; roadway deformation was greatly manifested at the end of heave severe (measured at the end of the dark roadway maximum reached 1.6m), affecting the normal movement of material and personnel transport.Occurrence for Zhaozhuang 3# coal seam conditions, rock geomechanical conditions, the use of theoretical analysis, numerical simulation and measured a combination of down hole tools, systematic study of soft-coal mining face greater mining height cover rock structure and motion law, mining tunnel floor heave control technology and the coal-face wall piece to help control and so on. Practical application of research results have been achieved zhaozhuang 3 # coal seam of the safety of mining, and made the following findings:(1) Further revealed the structure and motion law of overlying strata with greater mining height. And compared to the general fully-mechanized mining face, the soft coal greater mining high face overlying rock law of motion has its particularity. Mainly as follows: under the Greater mining height, due to filling of space required for mined-out area increases, the recovery after the roof of the deformation increases, the balance of the overlying rock structure will appear in the higher horizon;(2) The ribs fall of the face coal wall has a relationship with the mining height, coal joints fractured situation, the falling roof characteristics and other factors. By increasing the resistance of hydraulic support and improving the mining process to control the ribs fall of coal wall effectively.(3) Analysis the mechanism of the greater mining height roadway floor heaves, determine the impact factors, and determine the control technology programs of greater mining height roadway floor heave under complex conditions.(4) Through theoretical analysis, numerical simulation and down-hole measurement reveals the mine pressure behavior of soft coal with greater mining height.The research results not only guided the production of 3305 face of Zhaozhuang mine, but also for the development of fully mechanized mining exploration application of a useful, important works in practice.