项目名称: 隧道围岩建模与动态更新的不确定性方法
项目编号: No.41272289
项目类型: 面上项目
立项/批准年度: 2013
项目学科: 天文学、地球科学
项目作者: 李晓军
作者单位: 同济大学
项目金额: 70万元
中文摘要: 针对隧道围岩地质模型难以评估不确定性、对隧道围岩稳定性起控制作用的岩体节理与裂隙考虑不足、以及隧道地质模型不易动态更新的问题,拟从隧道围岩空间属性(包括空间位置信息和物理力学参数)的不确定性估计、裂隙岩体结构面的随机建模以及地质模型的动态更新三个方面出发,创新地开展以下研究:①在基于多源地质数据估计围岩空间属性不确定性基础上,采用序贯随机模拟方法得到围岩空间属性全局不确定性,建立考虑地质变量空间结构特征的围岩空间属性不确定性动态更新方法。②提出不依赖于分布形式的结构面几何参数的分布估计,利用先验信息动态更新结构面几何参数概率分布,实现隧道岩体结构面动态三维网络模拟。③基于上述方法,集成隧道围岩空间属性模型与结构面模型,实现其可视化及在隧道围岩稳定性分析中的应用。研究旨在合理地表达、评价并降低隧道围岩地质模型的不确定性,为隧道工程的设计与施工服务。
中文关键词: 地质建模;结构面;不确定性;动态更新;
英文摘要: Geological model of tunnel surrounding rocks is characterized by the difficulty in assessment of uncertainty, insufficient modeling of discontinuity, and uneasy to update. This research considers these problems in terms of estimation of spatial attribute uncertainty, stochastic simulation of discontinuity, and dynamic updating of geological model. The main research contents include: (1) Estimation of spatial attribute uncertainty using multi-source geological information, sequential simulation of global uncertainty of spatial attribute, and dynamic updating of uncertainty with consideration of spatial correlation of rock properties. (2)Estimation of distribution of geometric parameters of discontinuity by a distribution-free method, updating of the probability distribution using prior knowledge, and three dimensional stochastic simulation of discontinuities in tunnel sourrounding rocks. (3) Integration of spatial attribute model with discontinuities model, visualization and spatial analysis of the integrated geological model, and application of the integrated geological model in the stability analysis of tunnel surrounding rocks. The main objective of the research is to represent, evaluate, and reduce the uncertainty of the geological model of tunnel surrounding rocks, and to provide basis for the tunnel design
英文关键词: geological modeling;discontinuity;uncertainty;dynamic updating;