关键词: 深竖井, 高地应力, 围岩控制, 卸压钻孔

Abstract: With the depletion of shallow resources， more and more mines are gradually entering the deep mining stage. At the same time， the problem of deep mining surrounding rock control is becoming more and more prominent. It is urgent to carry out the research of deep shaft surrounding rock control technology to provide theoretical and technical support for the ground pressure control of deep mining. Taking the actual engineering situation of a deep shaft as the engineering background， numerical simulation test of surrounding rock deformation and failure of shaft in different geostress was carried out by using FLAC3D software. Through optimizing the control technology of surrounding rock of shaft with high geostress， the study on the support technology of surrounding rock in high geostress with different pressure relief holes was carried out， and the field test was carried out. Results show that plastic zone of the surrounding rock develops from the direction to minor principal stress gradually transition to “X”-shape with the increase of geostress； the implementation of pressure relief hole outside the shear plastic zone in the surrounding rock makes the concentrated stress of the surrounding rock transfer to the deep zone， and reduce convergence displacement of shaft wall and surrounding rock. Through engineering application， the total displacement of the shaft wall is less than 2 mm， and the displacement rate is far less than the warning threshold， and the shaft wall is in a healthy state， and there is a certain safety margin. The above study results further indicated that the flexible primary support and concrete shaft liner combined with borehole pressure relief technology can effectively maintain the safety and stability of the shaft liner under high stress conditions， and the application effect is good.

Key words: deep shaft, high geostress, surrounding rock control, pressure relief hole