| 摘要 |
PROBLEM TO BE SOLVED: To provide a method capable of efficiently and safely extracting a discontinuity surface of a tunnel working face and highly accurately preparing an assumed map of natural ground in front of a tunnel, and its device.SOLUTION: A TIN model of a tunnel working face is prepared from three-dimensional coordinate data of the tunnel working surface collected using three-dimensional collection means, strikes/inclinations of surfaces of respective triangles of the TIN model are calculated to obtain a distribution of the strike/inclination of the surfaces of the triangles, and the discontinuity surface where the strike/inclination are different from that of an excavation surface which is the surface when the tunnel working face is considered as a single surface is extracted from the distribution of the strike/inclination of the surfaces of the triangles. Thus, the assumed map of the natural ground in front of the tunnel for evaluating stability of the natural ground when excavating the tunnel for a fault or the like is highly accurately prepared. |
