Snøskred generelt. Snø og snøskred vinteren 1973-74

DENNE RAPPORTEN GIR EN BERETNING OM SNØSKREDFORHOLDENE OG FORSKNINGSAKTIVITETEN VED SKREDSTASJONEN, STRYNEFJELL VINTEREN 1973/74. FØRST BESKRIVES DE PROSJEKTENE MAN ARBEIDET MED, DERETTER OMTALES VÆR- OG SNØFORHOLDENE, OG OBSERVASJONENE BLIR FRAMSTILT BADE GRAFISK OG I TABELLFORM. ALLE OBSERVERTE SNØSKRED I OMRADET ER INNTEGNET PA KART OG KLASSIFISERT I TABELLER ETTER DET INTERNASJONALE KODESYSTEM. RAPPORTEN GIR OGSA EN KORTFATTET BESKRIVELSE AV SNØSKREDFORHOLDENE I LANDET GJENNOM VINTEREN. DET ER OGSA GITT EN LITEN OMTALE AV DE STØRSTE SKREDULYKKENE.NTN

3D analysis of the 174-m high Quxue asphalt-core rockfill dam in a narrow canyon

publishedVersio

3D analysis of the 174-m high Quxue asphalt-core rockfill dam in a narrow canyon

publishedVersionpublishedVersio

Effects of acidic water on hydro-mechanical properties of asphalt concrete

Asphalt concrete is widely used in road and airport pavements and more recently also in the construction of impervious facings and central cores in dams and dykes. Asphalt concrete may be subjected to strongly acidic water when used in connection with storage of mine tailings (tailings dams). Acidic water reacts with bitumen and mineral materials and may cause deterioration of the behavior of asphalt concrete with time. The present study investigated effects of acidic water with time on aggregate-bitumen adhesion, bitumen penetration value, softening point and ductility, mass change of asphalt materials, and change in tensile strength for porous and impervious asphalt concrete. The test results show that impervious, hydraulic asphalt concrete is very resistant to acidic water and show insignificant deterioration of properties during the 3-year testing period used in the experiments

Design and performance of the Quxue asphalt-core rockfill dam

The design and performance of the 174-m high Quxue asphalt-core rockfill dam in Sichuan Province, China, are presented. An extensive field monitoring program was implemented. During construction, the asphalt core settled more than the adjacent transition zones, but no more than 20 mm due to strong interlocking with the coarser gravel particles in the transition zones. The lateral displacements of the core were recorded during the impoundment. The measured shear displacements were less than 10 mm between the core and the plinth along the steep abutments (about 70°), and the interface remained watertight. The dam was constructed in about one year, and the reservoir impoundment up to about 100 m height was done in two months. The performance monitoring documents that the asphalt core type of dam is suitable for high embankment dams even in narrow valleys with steep abutments. The core exhibits flexible and ductile behavior without cracking, and internal core erosion is not an issue of concern.publishedVersio