边坡协同式可靠度分析与定量风险评估方法研究

This project aims to propose an efficient slope reliability analysis and quantitative risk assessment method with a consideration of spatial variability, small failure probability level, and multiple failure modes. The auxiliary reliability method is developed for such purposes. Several key problems underlying this method are investigated systematically, such as the simple models updating, error analysis and control, and reliability updating using Bayesian approach based on multi-source information. An auxiliary reliability method is proposed for slope reliability analysis with spatially varying geotechnical parameters. The auxiliary reliability analysis is realized through the combination of simple and complex slope stability models. As for risk assessment, a quantitative consequence assessment approach is proposed based on finite element analysis. A quantitative risk assessment approach for slope failure with multiple failure modes is also developed. A quantitative risk assessment for two or three dimensional slopes is carried out using the auxiliary reliability method. Then, the proposed method is applied to the risk assessment of engineered slopes. Generally, this project will propose a reasonable and efficient method for slope reliability evaluation and quantitative risk assessment. It can provide theoretical basis and technical supports for slope risk mitigation. The importance and practical values are significant.

本项目针对考虑岩土体参数空间变异性、小失效概率水平、多失效模式的复杂边坡高效可靠度分析与定量风险评估问题开展研究。提出了协同式可靠度分析方法，系统地研究了协同式可靠度方法的几个关键问题：基于协同式可靠度方法的简单模型修正方法、协同式可靠度方法误差分析与控制、基于贝叶斯理论的协同式可靠度方法等。提出了考虑土体参数空间变异性的边坡协同式可靠度方法，并基于边坡稳定分析的多种简单模型和复杂模型进行协同式可靠度分析。提出了基于有限元法的边坡失效后果定量评估方法、考虑参数空间变异性的多失效模式边坡风险评估方法、基于协同式可靠度方法的二维/三维边坡定量风险评估方法。探讨了协同式可靠度方法在复杂边坡风险评估中的应用。本项目提出了一整套科学合理、高效实用的边坡可靠度分析与定量风险评估方法，从而为复杂工程边坡灾害防治提供理论依据和技术支撑，研究成果具有重要的理论意义和广阔的工程应用前景。

本项目提出了协同式可靠度分析方法，系统地研究了协同式可靠度方法的几个关键问题：基于协同式可靠度方法的简单模型修正方法、协同式可靠度方法误差分析与控制、基于贝叶斯理论的协同式可靠度方法等。提出了考虑土体参数空间变异性的边坡协同式可靠度方法，并基于边坡稳定分析的多种简单模型和复杂模型进行协同式可靠度分析。提出了基于有限元法的边坡失效后果定量评估方法、考虑参数空间变异性的多失效模式边坡风险评估方法、基于协同式可靠度方法的二维/三维边坡定量风险评估方法。探讨了协同式可靠度方法在复杂边坡风险评估中的应用。本项目提出了一整套科学合理、高效实用的边坡可靠度分析与定量风险评估方法，从而为复杂工程边坡灾害防治提供理论依据和技术支撑，研究成果具有重要的理论意义和广阔的工程应用前景。.项目执行期间发表SCI收录论文26篇、EI收录论文8篇。获湖北省自然科学一等奖1项，国际学术奖励1项。培养博士生3人，硕士生3人。