Landslide Topography at Dam Sites
Landslide as a Weathering Agent
1979 Volume 31 Issue 1 Pages 46-57
Details
1979 Volume 31 Issue 1 Pages 46-57
As the results of geomorphological analysis at constructed and projected dam sites, considerable number of landslide topography (including small scale gravitational fracture) is found although such a situation has not been realized by dam engineers.
On the other hand, the rock mass condition at the dam sites has been made clear due to intensive geological survey such as ground-survey, boring, test pitting and geophysical prospecting. Owing to these conditions, the study about the relation between landslide topography and the rock mass condition has been carried out. The discussed conclusion is as follows.
1) The landslide mass is composed of not only granular marerial but also giant boulder, and the latter has been taken as in-situ basement due to the undisturbed appearance until this geomorphological analysis is performed.
2) Landslide (including rock mass creep) is one of the important agent for rock mass weathering.
3) The distribution density of landslide topography is considerably high in geologically disturbed area such as Japan, although the characteristic feature of landslide topography is sometimes vague.
4) The good correlation between the rook mass and the topography shows the reliability of geomorphological analysis.
