六甲山トンネルの地質と断裂系

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The Rokko Tunnel built up in April 1967 is 2843m in length and combines Kobe with the Sanda basin in lesser distance. During its construction, geological survey with datailed mapping in scale of 1/100 was attempted and the results are summarized as follows: The wall of the tunnel consists of the quartz diorite, granite and rarely lithoidite. The mutual relation between the quarts diorite and the granite can be obsered in the tunnel and its adjacent area. The quarts diorite is cut by the granite and is transformed into hybrid rocks in some cases. The lithoidite ccures as dyke which is intruded into the quarts diorite and the granite. Major faults observed in the tunnel are located at 370m and 530m points from the southern entrance and the both have crushed zoned of ca. 10m in thickness with much outflow of water, respectively. A number of minor faults are also recognized along the mapped route. The fractures in rocks often show the same characteristics as those accompanied by the conjugate set due to that stress distribution under which the strike slip faults are expected. It may also be assumed that they are in connection with the tectogenesis by which the faulting is resulted. Though the zones of the velocity lower than 3 km/sec., checked by seismic prospecting prior to the construction, were generally assumed to be corresponding to faults and crushed zones, this is not always the case and they seem rather closely related to the direction and or spacing of fractures in parts.
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六甲山トンネルの地質と断裂系

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