ANALYSIS OF BOLT-SPRAY SUPPORTING PARAMETERS OF LARGE-SCALE UNDERGROUND CHAMBER OF THE FIRST DRIVING STATION OF NANFEN OPEN PIT USING ORTHOGONAL FINITE ELEMENT METHOD

In this paper, according to the optimization of the bolt-spray supporting parameters in first driving station of Nanfen Mine, the orthogonal design method is introduced into numerical simulation successfully;using the orthogonal FEM experimental method the influence of supporting system on engineering stabillty isanalyzed and the optimal values of bolt length, spray thickness and the stiffness of spray cement are given inconsideration of the relative displacement between roof and bottom and displacernent of border and the area ofplastic zone during construction and as stablilty index. The above analysis will give some theoretical guide toengineering design.