隧道砂卵石围岩离散元法细观参数计算方法研究

项目名称： 隧道砂卵石围岩离散元法细观参数计算方法研究

项目编号： No.51208069

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 建筑环境与结构工程学科

项目作者： 路军富

作者单位： 成都理工大学

项目金额： 25万元

中文摘要： 针对隧道砂卵石围岩颗粒离散特性，采用颗粒离散元法更能精细化模拟其失稳过程及破坏模式，然而砂卵石围岩离散元细观参数取值问题尚未解决，计算结果无法定量判定，由此本项目拟对隧道砂卵石围岩离散元法细观参数计算方法进行研究。首先，基于颗粒离散元法，构建与大型粗粒土真三轴试验机足尺比例和加载方式相同的三轴数值试验模拟平台；其次，选择代表性级配砂卵石围岩为研究对象，采用大型真三轴试验，确定其不同密实度和含水量细观组构宏观力学参数及变化规律；然后，基于三轴数值试验模拟平台，建立与真三轴试验相同细观组构的砂卵石围岩离散元模型，揭示其离散元细观参数对宏观力学特性影响规律。最后，依据以上试验结果合理标定不同细观组构砂卵石围岩离散元模型细观参数，通过理论分析形成一套不同颗粒级配和密实度及不同含水量细观组构砂卵石围岩离散元法细观参数计算方法，为隧道砂卵石围岩离散元精细化模拟细观参数取值提供重要参考依据。

中文关键词： 隧道；砂卵石围岩；离散单元法；细观参数；

英文摘要： According to the particle property of the tunnel sandy-cobble surrounding rock, a particle discrete element method can better subtly simulate its instability process and its failure mode. However, the numerical value of microscopic parameter of discrete element method for the tunnel sandy-cobble surrounding rock has not been solved, and the calculation result can not be judged quantitatively. Therefore, this research aims to make calculation method research on microscopic parameter of discrete element method for the sandy-cobble rock surrounding of tunnel. To begin with, based on the particle discrete element method, this research constructs a tri-axial numerical experiment simulation platform which has the same full scale and loading method as the true tri-axial test of large-scaled coarse-grained soil; secondly, this research finds out the macro-mechanical parameter and the variation law of the microscopic structures under different compactness and water contents by means of selecting representative graded sandy-cobble surrounding rock of tunnel as the research object and employing large-scaled true tri-axial experiment; thirdly, based on the simulation platform of the tri-axial numerical value experiment, this research constructs a discrete element method model with the same structure as that in the true tri-

英文关键词： Tunnel；sand and gravel surrounding rock；discrete element method；microscopic parameter；