Study On Drilling Shaft Repair With Inner Shaft Lining Structure In Complex Conditions

Since the 1980s,the east China area for deep-lying unstable strata of vertical shaft wall in the large area of the rupture accident,caused huge losses due to the management difficulty. In east China now only to the deep development of coal mining,unstable wellbore will through deep overburden strata, and the bursting of the borehole wall is still in continue to happen,so the wall in thick surface unstable strata repair governance issues that need to be further research and exploration.This paper plate set coal mine engineering geological, hydrogeological and some other factors were analyzed, and through the theoretical research as well as internal model test set of shaftlining structure, it is concluded that the inner sleeve lining method on the broken wall repair, the results it is concluded that the set of the ultimate bearing capacity of the wall. In addition, the calculation and analysis using comfortable again, within the set of the safety of the wall. Set during coal mine as the research object, this article is based on board to board set on coal mine during fracture damage situation of wall, the inner sleeve wall to repair casing damage area management, and internal wall set of construction scheme, repair and other related introduction.Through internal wall structure research, at the same time, in combination with the practical cases of plate set coal during casing repair, according to the geological and hydrological conditions in deep overburden unstable strata, the inner sleeve of borehole wall in the same situation is obtained method, the advantages of thick surface for the future formation of sidewall instability repair management provided the certain basis.