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Influence of the Geological Structure on the Performance of Full-Face Tunnelling Machines in Mining
Cuttability and drillability of rock are similarly affected by geological structural features as are strength and deformability of a rock mass. The results of wedge penetration tests and disk cutting experiments on rocks with a distinctive strength anisotropy clearly show that anisotropy and discontinuities have to be fully taken into account for realistic predictions of the rate of penetration of a full-face tunnelling machine. A simplified procedure, assuming continuity and isotropy, would lead to wrong predictions. This is demonstrated on Ruhr Sandstone, a rock of only slight strength anisotropy. There the rate of advance of a full-face tunnelling machine in a direction normal to the bedding can be 1.3 times higher than in the direction parallel to it. An important mechanical parameter for the prediction of such differences is the tensile strength of the rock, particularly its degree of anisotropy. (ERA citation 08:018395)
Influence of the Geological Structure on the Performance of Full-Face Tunnelling Machines in Mining
Cuttability and drillability of rock are similarly affected by geological structural features as are strength and deformability of a rock mass. The results of wedge penetration tests and disk cutting experiments on rocks with a distinctive strength anisotropy clearly show that anisotropy and discontinuities have to be fully taken into account for realistic predictions of the rate of penetration of a full-face tunnelling machine. A simplified procedure, assuming continuity and isotropy, would lead to wrong predictions. This is demonstrated on Ruhr Sandstone, a rock of only slight strength anisotropy. There the rate of advance of a full-face tunnelling machine in a direction normal to the bedding can be 1.3 times higher than in the direction parallel to it. An important mechanical parameter for the prediction of such differences is the tensile strength of the rock, particularly its degree of anisotropy. (ERA citation 08:018395)
Influence of the Geological Structure on the Performance of Full-Face Tunnelling Machines in Mining
H. P. Sanio (author) / H. K. Kutter (author)
1982
52 pages
Report
No indication
English
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