Abstract
The large scale cavern with the maximum cross sectional area of 420m2 and the length of 61m, which was used as the settling basin of sewage plant. was planned and constructed in soft rock. The cavern was excavated by side pilot drift method at the arch section and multiple bench cutting method at the rest. After arch excavation, additional reinforcing anchors were installed to support the loosened ground. In this paper, the design and construction method of cavern in soft rock is presented. Also, details of adopted reinforcing anchors and the results of field monitoring are described.
