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| Study on service safety of super-large-span tunnels considering combined defects of lining voids and thinning |
Jianfei MA1( ),Gangshuai JIA1,Bo JIANG1,2,Zheng CHEN3,Xiaokang LING4,Shaohui HE1,*() |
1. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China
2. Infrastructure Inspection Research Institute, China Academy of Railway Sciences Corporation Limited, Beijing 100081, China
3. School of Resources and Safety Engineering, Chongqing University, Chongqing 400044, China
4. China Water Resources Pearl River Planning, Surveying & Designing Limited Company, Guangzhou 510610, China |
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Abstract The distribution law of lining defects in 19 high-speed railway tunnels was statistically analyzed, and the calculation method of surrounding rock pressure in tunnels with lining voids was modified. A numerical simulation was employed to analyze the combined defects’ impact on the internal forces and safety of super-large-span railway tunnels during their service period. Results show that combined defects of voids and thinning account for 39.3% of the statistical defects, making them the most frequent type in railway tunnels. The highest occurrence of combined defects is at the tunnel vault compared with other lining parts, with a frequency of 0.78. The surrounding rock pressure in the descending section of the void-affected region was replaced with a power function distribution, and a calculation method for the surrounding rock pressure in tunnels with voids was derived, which better reflects reality compared to the existing linear distribution. Combined defects cause significant variations in the internal forces and safety factors of super-large-span tunnel lining structures in both the defect-affected and influence zones, with the safety factor decreasing by up to 61.68%. Combined defects and lining degradation significantly impact the service safety of super-large-span tunnels, and the longer the service life, the more pronounced the effect on structural safety. Based on the minimum safety factors of 2.0, 2.4, and 2.8 for plain concrete, and 1.70, 2.04, and 2.38 for reinforced concrete, a safety evaluation and management standard for the linings of super-large-span railway tunnels with combined defects has been established.
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Received: 26 March 2024
Published: 25 April 2025
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| Fund: 中央高校基本科研业务费专项资金资助项目（2024YJS043）；国家自然科学基金资助项目（12374443）；国铁集团科研开发计划课题（2017G003-H）. |
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Corresponding Authors:
Shaohui HE
E-mail: majfncut@163.com;heshaohui1114@163.com
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含空洞-减薄病害的超大跨隧道服役安全研究
统计19座高铁隧道衬砌病害的分布规律，修正含空洞隧道围岩压力计算方法，数值仿真分析组合病害对服役期超大跨铁路隧道内力和安全性的影响. 结果表明：空洞-减薄组合病害占统计病害的39.3%，是铁路隧道出现频率最高的病害类型；组合病害在拱顶处的出现频率最高，为0.78. 将空洞影响区域下降段的围岩压力替换为幂函数分布，推导出比现有线性分布方法更符合实际情况的含空洞隧道围岩压力计算方法. 组合病害导致超大跨隧道衬砌结构内力和安全系数在病害作用区和影响区剧烈变化，安全系数最大降低61.68%. 组合病害和衬砌劣化显著影响超大跨隧道服役安全性，服役时间越长，对结构安全性的影响越显著. 以素混凝土最小安全系数为2.0、2.4、2.8和钢筋混凝土最小安全系数为1.70、2.04、2.38为界限，建立超大跨铁路隧道含组合病害的衬砌安全评价分级和管理标准.
关键词：
隧道工程,
衬砌病害,
荷载结构法,
组合病害,
数值模拟
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