Original scientific paper
DEFINITION OF THE FAILURE SHAPE IN TUNNELS BY MEANS OF THE GEOLOGICALLY DEFINED PLANES OF DISCONTINUITIES
Mladen Hudec
Lidija Frgić
Abstract
The data from the engineering geological measurements have to be adequate prepared for later use in the computer programs for examination of the underground rooms stability. The only mean values of the dip direction and dip angles are not relevant for later calculations, but rather the statistically defined area containing chosen percentage of the collected data. The main conclusions of the block theory are accepted for visual presentation of the relation between the rooms cross--sections and the planes of discontinuities so that the position and shape of critical (key) blocks can be easy recognized. The roof falls and side sidings volumes have to be tilled in the site with the expensive concrete, so the avoiding of falls is a challenge to the theory and tunnelling practice. The program based on the boundary elements is adapted so that it can calculate the failure criteria on the planes of weakness and compare this with the failure criteria through in the rock itself. The area with critical security factor will be displayed and so the numerically possible rock and block failure recognized.
Keywords
block theory; boundary elements method; statistics in geology; underground rooms; tunnels
Hrčak ID:
13708
URI
Publication date:
4.12.1994.
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