复杂环境软岩偏压隧道数值模拟与现场监测分析
Numerical Analysis and On-Site Monitoring Technology for Soft Rock Biased Pressure Tunnels in Complex Environments
喻靖宇1
作者信息
- 1. 中铁十二局集团第三工程有限公司 山西太原 030024
- 折叠
摘要
为探究复杂地质环境软岩偏压隧道在施工过程中结构的力学特征和变形特点,依托渝昆高铁在建隧道工程,采用数值模拟软件对隧道开挖过程进行仿真分析,并与现场实际监测数据相对比.结果表明:数值模拟能够较好地反映软岩偏压隧道实际施工状态,隧道开挖初期变形速率较大,后期逐步收敛,最大沉降值为206.72 mm,最大水平位移达到249.09 mm;初期支护最大拉应力为6.14 MPa,最大压应力为12.8 MPa,均不同程度超过规范中混凝土的抗拉强度及抗压强度设计值;由于现场降水较多,且软岩吸水性较好,隧道偏压效应明显,导致深埋侧变形和受力更为复杂.综合数值模拟和现场监测结果,提出优化施工工法、增大预留变形量等施工建议.
Abstract
In order to explore the mechanical and deformation characteristics of the structure during the construction of a soft rock biased pressure tunnel in complex geological environments,based on the construction of the Chongqing-Kunming high-speed railway tunnel project,numerical simulation software was used to analyze the excavation process of the tunnel,and comparative analysis was conducted with on-site monitoring data.The results show that numerical simulation can better reflect the actual construction status of the soft rock biased pressure tunnels,and the initial deformation rate of the tunnel excavation is relatively large,gradually converges in the later stage,with a maximum settlement of 206.72 mm and a maximum horizontal displacement of 249.09 mm;the maximum tensile stress of the initial support is 6.14 MPa,and the maximum compressive stress is 12.8 MPa,both of which exceed the tensile strength and compressive strength design values of concrete in the specifications to varying degrees;due to the high amount of on-site precipitation and the good water absorption of soft rocks,it has brought greater bias pressure effects of the tunnel,resulting in more complex deformation and stress on the deep buried side.Based on the results of numerical simulation and on-site monitoring,construction suggestions such as optimizing construction methods and increasing reserved deformation are proposed.
关键词
软弱围岩/偏压效应/数值模拟/现场监测/控制措施Key words
weak surrounding rock/bias effect/numerical simulation/on-site monitoring/control measures引用本文复制引用
基金项目
中铁十二局集团有限公司科技研发计划(集团2022 研-19号)
出版年
2024
NETL
NSTL
万方数据