1963 年 25 巻 1 号 p. 31-34
On the measurment of soil displacement, it is necessary to clear the characteristic of displacement of soil displacement measuring pieces, and its characteristic can be shown by the trusting ratio of them. The trusting ratio of soil displacement measuring pieces changes by the material, size and specific-gravity of them, but we summarized as follows:
(1) The authors have introduced the following equation to indicate the trusting ratio of soil displacement measuring pieces.
The trusting ratio (%)=100-β×average deviation
where, β is a coefficient that is determined by the number of divided stratums and the minimum value of scattering soil to divided stratums.
(2) The trusting ratio of chalk-pieces are as follows:
length trusting ratio
(3) There is some relation between the trusting ratio and the number of soil displacement measuring pieces. When the number of them increases, the trusting ratio approximates to characterestic value of them.
(4) On the measurment, more than a hundred soil displacement measuring pieces is necessary.