摘要
为了保障川藏铁路高温段隧道安全施工和长久运营,采用RFPA2D-Thermal热-固耦合模型,对低温通风环境下高温隧道的温度场和应力场演化规律以及隧道围岩的损伤破坏机理进行了研究。结果表明:低温通风环境下,高温隧道围岩温度迅速下降,岩体冷却收缩诱发的温度应力会造成岩体自身的损伤,从而萌生损伤裂缝;随着通风时间的增加,损伤裂缝会逐渐向岩石内部扩展;隔热层可以有效减弱低温风流所诱发的损伤作用;增加隔热层厚度和降低隔热层的导热系数,均能增强隔热层的隔热效果。该研究结果可以为川藏铁路隧道隔热层优化设计提供参考。
In order to guarantee the safe construction and long-term operation of the high-temperature section in SichuanTibet Railway tunnel,this research analyzed the temperature field and stress field of the high-temperature tunnel and the damage mechanism of the tunnel rock under the low-temperature ventilation by using the RFPA2D-Thermal thermal-solid coupling model.The results are as follows.Under the low-temperature ventilation,the tunnel rock temperature decreases rapidly,and the associated thermal stress induced by the cooling contraction can cause damage and crack the rock mass.The damage cracks gradually expand to the rock interior as the ventilation times increases;Paving the thermal insulation layer can effectively prevent the damage induced by the low-temperature airflow;Increasing the thickness of the thermal insulation layer and reducing its thermal conductivity both enhance its insulation effect.Our findings may provide a reference for the optimization design of the thermal insulation layer of Sichuan-Tibet Railway tunnel.
作者
亢方超
唐春安
KANG Fangchao;TANG Chunan(State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian,Liaoning 116023,China;Deep Earth Engineering Research Centre,Dalian University of Technology,Dalian,Liaoning 116023,China)
出处
《水利与建筑工程学报》
2021年第3期166-170,187,共6页
Journal of Water Resources and Architectural Engineering
基金
国家自然科学基金项目(41941018)。
关键词
隧道安全
高温隧道
温度应力
损伤破坏
tunnel safety
high-temperature tunnel
thermal stress
rock damage
