This report discusses the challenges associated with geotechnical design through a review of research on the reliability analysis of geotechnical structures. This report is organized into two parts: (1) challenges related to the geotechnical structural design in the conventional and narrow sense, and (2) challenges related to evolving the geotechnical structural design in the broad sense. In the first part, the uncertainties to be considered in foundation design are listed, and their statistics are examined. Additionally, the sensitivities of each uncertainty propagation to the design outcome (performance) are examined, and the perspectives in the narrow sense of structural design are discussed. In the second part, the necessity of evaluating the temporal change of the structural state (structural performance) by reliability updates with additional observations, considering the design of geotechnical structures as the management system of the initial design, construction, and maintenance through a review of research is discussed. Furthermore, the importance of evolving to a more flexible design system, i.e., recalling the original idea of the performance design concept, is indicated.

本报告通过对岩土结构可靠性分析研究的回顾，讨论与岩土设计相关的挑战。本报告分为两部分：（1）与传统和狭义的岩土结构设计相关的挑战，以及（2）与发展广义的岩土结构设计相关的挑战。第一部分列出了基础设计中需要考虑的不确定性，并对其统计量进行了检验。此外，还检查了每个不确定性传播对设计结果（性能）的敏感性，并讨论了狭义结构设计的观点。在第二部分，通过对研究的回顾，讨论了将岩土结构的设计视为初始设计、施工和维护的管理系统，通过附加观察的可靠性更新来评估结构状态（结构性能）的时间变化的必要性。此外，还指出了向更灵活的设计系统演进的重要性，即回顾性能设计概念的原始想法。