越江隧道周围土体温度场的演化规律

Temperature Field Evolvement of Soils Surrounding Cross-river Tunnel

在越江隧道运营期间,隧道外侧土体会受到热源以热传导的形式产生持续扰动,从而改变土体的结构和工程性质。依据南京越江公路隧道浅层温度场以及管片外侧温度进行的长期监测试验结果,分析了其温度变化规律,建立了隧道浅埋段传热的三维数值模型。并以现场实测数据作为边界条件,利用有限差分方法对隧道周围土体的温度场进行了数值模拟,将模拟结果与实测结果进行对比,验证了模型的精度和可靠性,最后对隧道周围土体温度场时空演化规律进行了研究。分析成果可为相关领域设计人员提供参考。

During the operation period, soils surrounding cross-river tunnel are under persistent disturbance of heat conduction, the microstructure and engineering properties will be changed. Based on long term observations of the temperature outside shield tunnel segment and shallow soil temperature field of Nanjing cross-river tunnel, the temperature change regularity is analyzed, the 3D heat transfer numerical model of shallow-buried section of the cross-river tunnel is established. Applying the measured temperature of ground surface and tunnel segment as boundary conditions, the finite difference method is used to simulate the temperature field of soils surrounding the tunnel. The simulation result is compared to measured data to verify the model＇s reliability and precision. At last, the space-time evolution regularity of the temperature field surrounding the tunnel is researched. The analysis result could be used as a reference for the designers in related field.