脆弱な三波川変成岩地帯における長大切土法面の安定対策

概要

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This paper describes the stability counter-measure for the large cut slope in a highway construction site (Higasi-Kyushu High Way) located at the southwest of Usuki-city, Kyushu. This area can be divided into Sanbagawa metamorphic rocks (black schist, green schist and, its alternation) and Onogawa group (sandstone, shale, conglomerate and covered by Aso-4 pyroclastic deposit) by E-W trending Sashu-fault. The large cut slope (1 : 1.2 degree, 10 + bench-cut, about 85m length, 70m height difference, 230〜380m width) with Sanbagawa rocks occur lots of surface failure and catch the land slide deformation form the field measurement under the excavation. We focus on the weathered and fractured parameters of the Sanbagawa rocks and determine the unstable region of the slope. Then, we plan the counter-measure by using the rock bolt nailing and the ground anchor method.
社団法人地盤工学会の論文
2002-11-01