節杭の荷重 : 沈下量関係の理論解析法

抄録

This paper describes a theoretical analysis for estimating the load-settlement behavior of single nodular piles. This analysis uses the Mindlin's First Solution similarly to those previously proposed, for example, by D'Apporonia et al. (1963) and Poulus et al. (1968). The authors applied this solution to single nodular piles by taking into account the results of model tests and full-scale tests. The assumptions in the present analysis are as follows. (1) A pile is considered elastically compressible. (2) The pile and ground around pile are divided into several elements. (3) The load-settlement relations show non-linear behavior. (4) The settlement of the pile is equal to that the ground around the pile, when the resistance is smaller than the ultimate value in each element. After the resistance reaches the ultimate value in each element, a slip surface forms between the pile and the ground. (5) The shear resistance of nodular pile works on cylindrical slip surface whose diameter is equal to the nodule's one. (6) A resistance similar to a pile tip resistance works at the lower surface of a nodule. Settlement and axial forces calculated by the proposed method are compared with full-scale tests and field tests. There are generally good agreement between calculated and measured values.