Abstract
In tunnel construction in gravel-mixed ground, it is extremely important to predict the risk of gravel dropout and the accompanying large deformation of the substrate ground. The distribution and shape of gravel vary, and it is difficult to reproduce the situation depending on the individual site. Therefore, in this study, we created a model of the gravel-mixed ground using the Voronoi partition model. Then, by mathematical analysis, the gravel shape that appears in the actual phenomenon could be reproduced in consideration of randomness and inhomogeneity. In addition, it was clarified that the gravel extrusion phenomenon and the large deformation of the ground can be expressed.
Highlights
The geological structure in Japan is complicated, and excavating a tunnel in a mountainous area often makes construction difficult due to the presence of special ground conditions
Since it has been reported that tunnel excavation work is difficult due to problems caused by ground heterogeneity, we focused on the heterogeneous ground conditions among such special ground conditions and tunnels
If such a part of the ground unexpectedly appears around the tunnel during construction, appropriate support and auxiliary construction methods cannot be applied, and there is a possibility of largescale deformation of the tunnel and, in the worst case, collapse of the tunnel
Summary
The geological structure in Japan is complicated, and excavating a tunnel in a mountainous area often makes construction difficult due to the presence of special ground conditions. If such a condition exists near the tunnel, gravel may fall out due to tunnel excavation, thereby leading to collapse. If such a part of the ground unexpectedly appears around the tunnel during construction, appropriate support and auxiliary construction methods cannot be applied, and there is a possibility of largescale deformation of the tunnel and, in the worst case, collapse of the tunnel. If itrelatively is possible to large identifysized the problems arising, as the above-mentioned heterogeneous natural ground, by numerical analysis when drilling a tunnel before its construction, risks during construction can be considered to be greatly reduced These grounds are named breccia and tuff breccia depending on the grain size of the constituent particles (Fisher [1]), and hard gravel
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