日本白山地区甚之助谷特大型滑坡的变形机制(英文)

DEFORMING MECHANISM OF THE GIANT JINNOSUKE-DANILANDSLIDE IN HAKU-SAN MOUNTAINOUS AREA,JAPAN

甚之助谷滑坡是位于日本白山地区的特大型滑坡。其长约为2000m,宽500m。滑坡由中侏罗系-早白垩系的手取层群砂岩-页岩互层组成。7年来的地表变形观测结果表明,由于变形速度的差异,该滑坡可以分成上下两个部分。上部的变形速率为80～170mm/a的速度,而下部则相对稳定(3～15mm/a)。观测数据还显示了水位变动对滑坡位移造成的明显影响。变形观测和现场观察的结果证实该边坡的顺向坡结构和互层的风化效应是该滑坡变形的最基本因素。

The Jinnosuke-dani landslide is a giant landslide with a scale of 2 000 m in length and 500 m in width in Haku-san mountainous area, Japan. This landslide is consisted of alternative layers of sandstone and shale in Tetori Group that deposited from Mesozoic Jurassic period to Early Cretaceous period. Based on deformation monitoring results for more than seven years, the landslide is divided into upper block and lower block. The upper block moves at a relatively high speed (80 mm to 170 mm/year), while the lower block moves slowly (3 mm to 15 mm/year). Monitored data also show that the variation of the groundwater level has a great influence on the landslide movement. The effects of the dip slope structure and weathered alternative sandstone layers and shale layers on the landslide deformation were confirmed to be very important through the monitoring and field investigation.