耕盤のある圃場における支持力のすべり線解析(第2報)−干渉状態のすべり線場の支持力解析−

要旨

圃場機械の走行部の合理的な設計指針を得るため,耕盤のある圃場の車両に対する支持力問題を剛盤上の摩擦性剛完全塑性体への2つの近接する荷重としてモデル化を行い,すべり線法により解析を行った。第1報で2つの荷重下に生じる干渉状態のすべり線場は荷重幅および荷重間隔に応じて5種に分類されることを示した。本報ではそれぞれのすべり線場に基づいて支持力を算定し,荷重幅,耕盤深さおよび荷重間隔による支持力の推移状況を明らかにした。

〔キーワード〕 支持力,すべり線場,剛塑性,平面ひずみ,耕盤

A Slip-Line Analysis for the Bearing Capacity of Farm Land on a Sole Pan (Part 2) - Bearing Capacity of Interfering Slip-Line Fields -

Abstract

In order to establish a reasonable designing method for traveling device of agricultural machinery, the bearing capacity of farm land is theoretically analyzed by the slip-line field method. The vehicle on farm land is regarded as two adjacent loads penetrating into rigid-perfectly plastic solid with internal friction on rigid sole pan. The five types of interfering slip-line field under such load condition were proposed for relation to load width and its interval in the preceding paper. In this study the bearing capacity is calculated for each slip-line field. Then, the change in the bearing capacity is discussed in relation to the load width, the load interval and the depth of sole pan.

[Keywords] bearing capacity, slip-line field, track, rigid plasticity, plane strain, hard sole pan