Abstract The Mietsu Naval Facility (MNF) was established as a Western-style military facility by the Saga Clan in 1858. The aim of the present study was to examine the purpose and installation method of cedar logs preserved in the Small Boat Dock (SBD) section of the MNF. In order to restore the scale and shape of the superstructure at the SBD to those at the time of its construction, it was necessary to determine the role of the cedar logs. The movement of the soil particles in a laboratory model, made of Kawasaki clay and penetrated by a foundation pile, was examined in order to simulate the deformation behavior around the cedar logs. The deformation around the pile, caused by the pile penetration, increased within the range of the pile diameter. The changes in the natural water content and the undrained shear strength around several piles in the SBD were measured. The model test results revealed that the cedar logs were driven piles, and thus, not posts of the building. Based on this knowledge and additional research into architectural history, it was possible to determine the scale and shape of the superstructure, potentially leading to the restoration of the original buildings and remains.

中文翻译：

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三重海军设施世界遗产地雪松桩的岩土工程解释

摘要 三重海军设施 (MNF) 是佐贺氏于 1858 年建立的西式军事设施。本研究的目的是研究保存在小船坞 (SBD) 中的杉木原木的用途和安装方法。 MNF 的部分。为了将 SBD 上层建筑的规模和形状恢复到建造时的规模和形状，有必要确定雪松原木的作用。为了模拟雪松原木周围的变形行为，研究了由川崎粘土制成并被基桩穿透的实验室模型中土壤颗粒的运动。由桩穿透引起的桩周围变形在桩径范围内增大。测量了 SBD 中几个桩周围的天然含水量和不排水抗剪强度的变化。模型测试结果显示，雪松原木是打桩，因此不是建筑物的柱子。基于这些知识和对建筑历史的额外研究，可以确定上层建筑的规模和形状，从而有可能恢复原始建筑物和遗迹。