特大跨度扁平洞室围岩损伤破坏数值模拟研究

Numerical Simulation Study on Damage and Failure of Surrounding Rock in Large-span Flat Caverns

文章针对洞库大跨度扁平拱的不利结构特征,运用正交试验设计数值模拟方案,系统研究了岩体等级、埋深、跨度、扁平率等因素影响下的围岩应力、应变等变化特点;利用全局敏感性分析找到应力指标和变形指标的主控因素,确定各级围岩下洞库跨度的分界标准,分析研究了主控因素的影响规律。

In view of the unfavorable structural characteristics of the large-span flat arch,the numerical simulation scheme was designed using orthogonal experiments to systematically study the changes in stress and strain of surrounding rock under the influence of factors such as rock mass grade,burial depth,span,and flatness.The main control factors of stress index and deformation index are found by global sensitivity analysis,the boundary standards of tunnel vault span under surrounding rock are determined,and the influence rules of main control factors are analyzed.