EXPERIMENTAL INVESTIGATION ON METHOD OF STRATUM SETTLE￣MENT COORDINATION TO PREVENT AND CONTROL COALMINE SHAFT FAILURE

Abstract

In recent years,many experts and scholars have carried out theoretical and experimental research on the mechanism of additional stress in shaft lining and the corresponding eliminating methods. On the basis of these researches,this paper proposes the strata settlement coordination method,analyzes the mechanism of the proposed method,carries out an experimental study on the change of additional stress in shaft lining in the soil layer,as well as analyzes the effectiveness of the proposed method while it is used in eliminating the additional stress. By setting different isolation coordination conditions,the proposed method acquires the stress variation of shaft lining and the settlement deformation of soil surface in the strata settlement process. In the experiment,there are sudden increases in the vertical strain of the shaft lining. The first group without isolation coordination body,the sudden increase values are obviously higher than the latter three groups. In addition,the settlement of the ground surface in the process of strata subsidence can be decreased using the method of stratum settlement deformation. The proposed method can decrease the sudden increase values and the steady values of shaft lining vertical strain effectively. In the meantime,the horizontal strain of cylinder can keep steady. Therefore,the proposed method can be developed to be a potentially effective approach for prevent and control lining failure of coal mine shaft.