恵那山トンネル竪坑工事の地質工学的な報告

抄録

This report refers to some geotechnical experiences about the shaft work in Enasan-tunnel that is lately completed.
They contain following topics.
(1) location of the shaft
(2) geotechnical investigation fer design and operation
(3) a boring for drain and attendant works
(4) excavation in distress
(5) cracks in lining due to 440 m-fault gouge