Research on Floor Heave Control of the Gob-side Entry Retaining with Large Section in Deep Mine

摘要

It is inevitable trend that coal mining extends to the deep,with the increasing mining depth and mining intensity,relative gas emission in working face increases,so "Y"-type ventilation in the gob-side entry retaining with large section is key technology of coal and gas extraction,meanwhile improves the coal recovery rate to achieve an important measure of no pillar to protect roadway.floor heave is very common phenomenon in the gob-side entry retaining,there are a series of problems to control floor heave of the gob-side entry retaining with large section in deep mine,such as support theory of the gob-side entry retaining based on shallow mining is no longer suitable for deep mining,there is no targeted theoretical and technical guidance for the gob-side entry retaining with large section in deep mine,and study on floor heave control is much less.The gob-side entry retaining with large section in deep mine is of complex stress environment and violent strata behavior,the stability of surrounding rock especially floor heave is difficult to control.So,based on dynamic evolution mechanism of floor heave and overall classification and sub-classification of the gob-side entry retaining with large section in deep mine,floor stability control principles and sorted prevention and control methods are raised,basic prevention and control theory of heave floor in the gob-side entry retaining with large section in deep mine which is suitable for China's national conditions is established,which makes prevention and control of floor heave in the gob-side entry retaining with large section in deep mine from engineering analogy stage to the scientific quantitative design stage,thus achieves their design scientific,systematic and quantitative.