双洞公路隧道中夹岩柱可靠度研究
Study on Reliability of Middle Rock Pillar in Double-hole Highway Tunnel
李宁 1陈宏伟1
作者信息
- 1. 安徽理工大学矿业工程学院,安徽 淮南 232001
- 折叠
摘要
目的 为了探究双洞隧道开挖后中夹岩柱的变形规律及破坏特征,改进岩柱稳定性定量评估方法.方法 以某市公路双洞隧道为例,建立了非侵入式随机有限元-蒙特卡罗分析框架,提出基于中夹岩柱中部轴线变形的应变失稳准则.通过改变岩土体的物理力学参数变异系数、岩柱宽度以及隧道埋深研究双洞隧道开挖后中夹岩柱的失效概率,并分析其变化规律,进而采用系统稳定性分析法对影响岩柱的参数进行敏感性分析.结果 在该工程背景下的中夹岩柱失效概率为0.220 4,需定期进行稳定性监测.比较各影响因素归一化敏感度因子,岩柱失效概率对各因素敏感性由高到低依次为弹性模量变异系数、岩柱宽度、黏聚力变异系数、内摩擦角变异系数与隧道埋深,后续设计相似岩体参数分布的双洞隧道时,应关注弹性模量变异系数对岩柱稳定性的影响.结论 非侵入式随机有限元-蒙特卡罗分析框架能够对中夹岩柱可靠度进行计算,实现结构的稳定性定量评估,为双洞隧道设计及稳定性控制提供一定的理论依据.
Abstract
Objective In order to explore the deformation law and failure characteristics of the middle rock pillar af-ter the excavation of the double-hole tunnel,and improve the quantitative evaluation method of the stability of the rock pillar.Methods Taking a double-hole highway tunnel in a city as an example,the non-intrusive stochastic fi-nite element-Monte Carlo analysis framework was established,and the strain instability criterion based on the de-formation of the central axis of the middle rock pillar was proposed.By changing the variation coefficient of physi-cal and mechanical parameters of rock and soil,the width of rock pillar and the buried depth of tunnel,the failure probability of middle rock pillar after excavation of double-hole tunnel was studied,and its variation law was ana-lyzed.Then,the sensitivity analysis of parameters affecting rock pillar was carried out by using the system stability analysis method.Results The failure probability of the middle rock pillar under the background of this project was 0.220 4,and the regular stability monitoring was necessary.Compared with the normalized sensitivity factors of each influencing factor,the sensitivity of the failure probability of the rock column to each factor from high to low was the coefficient of variation of elastic modulus,the width of the rock column,the coefficient of variation of co-hesion,the coefficient of variation of internal friction angle and the buried depth of the tunnel.When the double-hole tunnel with similar rock mass parameter distribution was designed,the influence of the coefficient of variation of elastic modulus on the stability of the rock column should be paid attention to.Conclusion The non-invasive stochastic finite element-Monte Carlo analysis framework is able to calculate the reliability of the middle rock pil-lar and realize the quantitative evaluation of the stability of the structure,which provides a theoretical basis for the design and stability control of the double-hole tunnel.
关键词
中夹岩柱/非侵入式随机有限元法/数值模拟/可靠度/敏感性分析Key words
middle rock pillar/non-intrusive stochastic finite element method/numerical simulation/Reliability/sensitivity analysis引用本文复制引用
基金项目
中国博士后科学基金面上项目(2020M681975)
出版年
2024
NETL
NSTL
万方数据