隧道衬砌结构不确定性分析与测点布置研究
Study on Uncertainty Analysis and Sensor Placement of Tunnel Lining Structure
李善豪 1柯善鑫 1李锋 1张希龙 1裴雪扬2
作者信息
- 1. 中交第三公路工程局有限公司,北京 101304
- 2. 盐城工学院 土木工程学院,江苏 盐城 224051
- 折叠
摘要
在隧道工程中,确保衬砌结构安全至关重要,其中内力分析和安全评估是关键.通过数值模拟和现场监控量测手段分析结构内力,计算关键部位的安全系数.鉴于建模和测量误差的存在,引入概率模型量化安全系数估计的不确定性,并对轴力和弯矩的重构误差进行归一化处理,全面评价测点适宜性.以安徽境内某隧道为例,综合分析围岩压力分担比、水平围岩压力系数和测量噪声等因素对安全系数估计的影响,估计所得安全系数总体符合正态分布趋势,拱顶中部和拱肩位置处的安全系数波动较大.以减少估计不确定性和内力信息重构偏差为目标,结合现场实际工作条件安排测点位置.长期监测数据表明,二次衬砌结构内力在浇筑初期受多种因素影响波动明显,100 d后趋于稳定,结构安全储备充足.研究结果可为隧道衬砌结构安全系数统计分析和测点布置提供参考.
Abstract
In tunnel engineering,ensuring the safety of the lining structure is crucial,with internal force analysis and safety as-sessment being key components.This study analyzed the structural internal forces through numerical simulations and on-site monitor-ing measurements,calculating the safety factors at critical locations.Given the existence of modeling and measurement errors,this paper introduced a probabilistic model to quantify the uncertainty in estimating safety factors,and normalizes the reconstruction errors of axial forces and bending moments to comprehensively evaluate the suitability of measurement points.Taking a tunnel in Anhui as an example,the study comprehensively analyzed the impact of factors such as the rock pressure sharing ratio,the horizontal rock pres-sure coefficient,and measurement noise on the estimation of safety factors.The estimated safety factors generally followed a normal distribution trend,with larger fluctuations at the mid-arch and arch shoulder positions.Aiming to reduce estimation uncertainties and biases in the reconstruction of internal force information,measurement points were arranged in accordance with on-site working condi-tions.Long-term monitoring data indicated that the internal forces in the secondary lining structure fluctuated significantly due to vari-ous factors at the initial stage of casting and stabilized after 100 days,ensuring an adequate safety reserve for the structure.This re-search can provide references for the statistical analysis of safety factors and sensor placement in tunnel lining structures.
关键词
隧道工程/衬砌结构/不确定性分析/信息重构/测点布置/施工监控/不利位置/安全系数Key words
Tunnel engineering/lining structure/uncertainty analysis/information reconstruction/sensor placement/construc-tion monitoring/unfavorable position/safety factors引用本文复制引用
出版年
2025
国家科技期刊平台
NSTL
万方数据