Abstract: To verify the adaptability and effectiveness of inclined digging technology in the rectification of a deviated rooting mine shaft tower in East China, the plastic zone around the inclined hole, the mechanism of the technology, and the influence of various factors on the rectification effect are studied by theoretical analysis, numerical simulation and field measurement. The results show that the radius of the plastic zone is proportional to the diameter of the hole and the stress around circle hole, and it increases with the depth of drilling hole. Drilling can effectively reduce the stress within a certain range of the digging hole, so that the soil around continuously collapses, and then the difference between external load on drilling side and the shaft lining can be reduced, which produces a stress difference with the opposite to promote the shaft tower back to correct. Based on the orthogonal experiment design, we find that the most important factor to influence the deviation is the row width of the drilling, and depth, diameter and the distance between drilling row and shaft centreline. Last, according to the study results, the optimal deviation scheme is designed by long term monitoring of the shaft tower deflection and lining stress, we conclud that this drilling technology is effective in the deviation rectification of rooting mine shaft tower.

Key words: stress relieving method, mine shaft tower, rectification, shaft lining monitoring