AI 中文总结
本研究针对新贝尔琴隧道建立二维平面应变THM模型，揭示热耦合对衬砌压力及开挖损伤区的影响，为长期反分析提供热学解释基础。
AI 中文摘要
奥帕林纳斯黏土（OPA）等泥岩地层中的隧道会产生热、水、力耦合响应。本研究针对采用隧道掘进机（TBM）开挖穿过断层OPA页岩的新贝尔琴隧道（STB）展开研究，现场测量显示衬砌温度与径向压力存在强关联。研究采用二维平面应变THM模型，模拟开挖、施工放热、季节性温度循环、孔隙压力瞬态变化及应力重分布过程；该模型可复现季节性压力循环的阶段特征与近似幅值，还能揭示衬砌、注浆体与OPA间的热膨胀失配如何改变衬砌荷载及近场孔隙压力，但对多个传感器处单调长期压力增长存在低估。通过与径向引伸计测量结果对比可知， moisture驱动的膨胀、局部地质构造、注浆或界面损伤及三维施工效应也会对压力产生影响。因此，该模型可支持对循环响应的热学解释，同时明确了开展更全面长期反分析所需的过程。
英文摘要
Tunnels in argillaceous formations such as Opalinus Clay (OPA) develop a coupled thermal, hydraulic, and mechanical response. This study examines the New Belchen Tunnel (STB), excavated by tunnel boring machine through faulted OPA shale. Field measurements show a strong relation between lining temperature and radial pressure. We use a two-dimensional plane-strain THM model to examine excavation, construction heat, seasonal temperature cycles, pore-pressure transients, and stress redistribution. The model reproduces the phasing and approximate magnitude of the seasonal pressure cycles and shows how the thermal expansion mismatch between the lining, grout, and OPA modifies lining load and near-field pore pressure. It underestimates the monotonic long-term pressure increase at several sensors. Comparison with radial extensometer measurements indicates that moisture-driven swelling, local geological structure, grout or interface damage, and three-dimensional construction effects also contribute. The model therefore supports a thermal interpretation of the cyclic response while defining the processes required for a fuller long-term back-analysis.
Comments44 pages, 18 figures, 6 tables. Accepted for publication in Tunnelling and Underground Space Technology
