中国矿山工程

In resent years, deep earth problems have exerted increasing influence on mine exploitation, raising widespread concern at home and abroad. High stress is the main source of deep earth problems. Though many achievements have been made in the research on prevention and control of hard rock burst due to high stress, the large deformation of soft rock caused by high stress remain a problem that troubles a great number of projects. Since Jinchuan No.2 mining area enters deep mining stage, it has been faced with various problems such as large deformation and high repair frequency of roadways. In this paper, based on the -650m ramp of Jinchuan No.2 mining area, numerical analysis is carried out on the supporting technology of high stress and large deformation roadways from the aspects of high geostress, strata structure and supporting conditions, and a multi-dimensional model is built to study the deformation rules and supporting technologies of roadways. The numerical analysis indicates that the roadways at the rock stratum controlled by horizontal stress fail in a mode of high-stress, whole section large deformation and instability; deformation rules are obviously reflected in the direction of main stress, where bottom heaving is caused due to the compressive stress and the failure features large range and long duration; bolt-grouting support shows good effect in control of bottom heaving and roadway convergence deformation, flexible support allows proper deformation, which can make the stress of surrounding rock adjusted and released.