水平泥砂互层围岩隧道受力特性及稳定性分析  

Analysis of the Mechanical Characteristics and Stability of Horizontal Mudstone-Sandstone Interbedded Surrounding Rock Tunnel

作　　者：刘立宏 LIU Lihong(China Railway First Survey and Design Institute Group Co.,Ltd.,Xi’an 710043,China)

机构地区：[1]中铁第一勘察设计院集团有限公司,陕西西安710043

出　　处：《粉煤灰综合利用》2024年第2期58-63,102,共7页Fly Ash Comprehensive Utilization

基　　金：陕西省重点研发计划(2022SF-198)。

摘　　要：水平层岩结构特殊,分布广泛,施工中极易发生离层、掉块等工程事故,分析互层状水平层岩隧道的受力特性和稳定性对于隧道设计和施工意义重大。从水平层岩的结构特点出发,对拱顶的离层及塌落拱的形成进行理论分析,建立简化的梁模型和薄板模型,对水平互层围岩隧道受力特性和稳定性进行系统性对比分析,推导出了水平层岩可承受的最大正应力、最大剪应力和最大变形值表达式,较好的解释了拱顶水平层岩受力后的变形以及破坏过程。模型计算与现场实测、数值模拟结果,在量级与趋势上基本一致,显示出及时支护、控制拱部变形的重要性。Horizontal rock structure is special and widely distributed,and engineering accidents such as separation and falling block are easy to occur during construction.Analyzing the mechanical characteristics and stability of interlayered horizontal rock tunnel is of great significance for tunnel design and construction.Based on the structural characteristics of the horizontal layer rock,the formation of the separated layer of the arch roof and the collapse arch are analyzed theoretically,a simplified beam model and a thin plate model are established,the mechanical characteristics and stability of the horizontal interlayer surrounding rock tunnel are systematically compared and analyzed,and the expressions of the maximum normal stress,maximum shear stress and maximum deformation value that the horizontal layer rock can withstand are derived.The deformation and failure process of the arch roof horizontal layer rock under stress are explained.The results of model calculation,field measurement and numerical simulation are basically consistent in magnitude and trend,which shows the importance of timely support and control of arch deformation.

关 键 词：公路隧道 水平层状围岩 受力特性 稳定性分析 

分 类 号：U451[建筑科学—桥梁与隧道工程]