蒲田川流域の地形・地質学的特性に関する研究(3) ―酸性迸入岩体における崩壊の特性について―

Abstract

Along the middle course of the Gainata River basin, there exists a belt of the acidicintrusive rocks extending from NNE to SSW. This best is measured as thick as about500 in, and it is consisted of granite-porphyry.In order to consider the morphological characters of the land slope including themechanical character of rocks, some statistical diagrams such as the orientation of jont andland surface, size of joint net, compressive strength of rock and yearly variation of sizeof land slide slopes are proposed.It was found that the orientation of the dip and strike of the land surface is closelyrelated to those of crack and joint of rocks constituting the surface, and that the size ofjoint net is also related to the mechanical character of granite-porphyry in the landsurface.