Mechanism of Initial Caving and Propagative Caving Induced by Undercutting Parameters of Block Caving Method
The mechanism of initial caving and propagative caving in the process of orebody's block caving affects the ca-ving temporal-spatial evolution law.In order to study the mechanism of the undercutting direction and height on the initial ca-ving and propagative caving process of block caving mines,orthogonal design and FLAC3D numerical simulation were used to study the initial caving conditions,propagative caving conditions,orebody caving morphology and caving volume under the con-ditions of the undercutting advancing direction perpendicular to or parallel to the maximum principal stress direction and the caving height of 8～12 m.The results show that there is a quadratic function relationship between the accumulative undercutting area and the caving height.After the initial caving occurs,the accumulative undercutting area and the accumulative caving vol-ume have an exponential function relationship.When the undercutting direction is constant,the caving height increases with the undercut height,and when the undercut height is large,it is beneficial to induce the initial caving and propagative caving in ad-vance,and the accumulative caving volume shows an overall growth trend.When the undercutting direction is perpendicular to the maximum principal stress,it is easier to induce initial caving and propagative caving than when it is parallel to the maxi-mum principal stress.The work reveals the initial and propagative caving of orebody induced by the undercutting parameters,which can provide the basis for the basic research of the block caving method in hard rock mines.
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