| 作成年度 | 2008 年度 |
|---|---|
| 論文名 | An Improved Method of Estimating Slip Surface Through Ground Surface Displacement of Landslide |
| 論文名（和訳） | |
| 論文副題 | |
| 発表会 | American Geographical Union Fall meeting 2008 |
| 誌名 | |
| 巻・号・回 | |
| 発表年月日 | 2008/12/01 |
| 所属研究室／機関名 | 著者名（英名） |
|---|---|
| 国際航業(株) | K.Takechi |
| 土木研究所土砂管理研究グループ地すべりチーム | K. Fujisawa |
| 土木研究所土砂管理研究グループ地すべりチーム | K. Ishida |
| 土木研究所土砂管理研究グループ地すべりチーム | T. Kuda |
| 土木研究所土砂管理研究グループ地すべりチーム, 土木研究所土砂管理研究グループ地すべりチーム, 日本工営(株), 日本工営(株), 基礎地盤コンサルタンツ(株), 基礎地盤コンサルタンツ(株), IST(株), (株)キタック, (株)レイディック | S. Okuda, S. Chiba, H. Kodama, T. Yamashita, K. Fukui, F. Ikei, N. Yokoyama, K. Ito, S. Ishizuka |
| 抄録 |
|---|
| After a landslide has occurred, it is important to estimate its characteristics and size at an initial stage of the disaster and to speedily take countermeasures for minimizing the damage.The existing method, however, has problems about safety and speed, as it requires entering the landslide mass.Now, as a faster method of grasping the size of the landslide, we, reviewing the method of estimating the shape of slip surface through the ground surface displacement vector, have developed a program for speedy estimation of it then and there.According to the result of the verifiction using the ground surface displacement vector measured at the actual landslide site, the calculted slip suface was comparatively in close accordance with the real slip surface, if measurement points of ground surface vectors were properly arranged. But when the number of measurement points at the head or toe was small and when the surface shape was complicated, this method proved less satisfactory. This paper describes an improved method and its verification as follows.1. When there was great difference between displacement vectors of adjacent blocks, because of equal gradient condition equation was strict, the estimated accuracy of slip surface falls, so weight coefficient determinant was added to the equal gradient condition equation of block boundaries.2. As to the estimation of the scarp of the head, a new parameter (ground boundary parameter: arbitrary boundary point which moves toward the scarp) was introduced. The result confirmed that this improved method can be effectively applied to chair type and ship bottom type landslides (The displacements of their heads have an usual forms of sinking considerably.). |
