山地地盤の研究(II) ―多電極を用いた比抵抗測定による降雨浸透の考察―

Abstract

Generally speaking, it is one reason when the ground failure of mountainous region be causedby the infiltration of rain water. It does not take part in correlative relation that the phenomenaoccurred as failure and slip on the slope ground and the variation of ground water level, but it candiscuss as to occur ground failure and slip due to the increase of hydrous water by the infiltration.The author has carried out investigation through the electrical survey about the movement ofhydrous, specially, the drop wetting front dew to the infiltration of rain water in the ground ofmountainous region. The method of investigation was to consider about the correlation of thedistribution of electrical apparent resistivity values with multi-electrodes and variation in thedistribution of hydrous with precipitation and was applied some knowledge of the undergroundgeological structure. Mainly, this paper is the report as variation of the ρa-a characteristic curveswas influenced rain water and confirmed that apparent resistivity (ρ) was droped about 20-30%from background values responded with the condition of ground structure.