自動観測システムによる地すべり地の地下水観測と地下水挙動の特性について : 松之山越地すべり地を例として

概要

論文の詳細を見る
Investigations of groundwater at Matunoyamakoshi landslide in Niigata Prefecture were made in 1986-87 after the occurance of the reactivated landslide in the spring 1985 by the developed automatic observation system. This system can automaticcally record several months observation data into an IC card even under deep snow in winter. The results obtained are as follows. Unconfined groundwater level which exists in old landslide debris of thickness up to about 6 m below the ground surface has been nearly constant near the ground surface in all seasons and was scarcely influenced by both water suply due to rainfall and drainage due to boring works. Conversely, groundwater pressure in the weathering mud rock underlying below the unconfined groundwater decreased with the drainage works. Pressure of groundwater outside the area of the slip was easily influenced to the rise by rainfall, in contrast with ground- water within the area of the slip. From the above and other results, it may be assumed that the slip surface clay which had been produced during the preceding slip constitutes a nearly impermeable layer.
新潟大学積雪地域災害研究センターの論文