局部存水空间对寒区隧道衬砌劣损特性的影响分析

Analysis of the influence of local water storage space on the inferior damage characteristics of tunnel lining in cold region

为了探明隧道衬砌与围岩之间局部脱空存水空间对隧道衬砌劣损性的影响,基于存水空间水热力三场耦合理论,利用ABAQUS软件建立了水热力耦合理论模型,并对隧道拱顶沉降位移和裂缝分布状态进行数值模拟。将数值模拟和实际监测数据进行对比分析,验证了理论模型的适用性。基于被验证的理论模型,对衬砌裂缝的渐进开裂过程进行了数值模拟分析,详细探讨了存水空间位置、冻胀量以及衬砌砼厚度变化对隧道衬砌结构应力、劣损裂缝的扩展及其分布规律的影响等相关问题。结果表明:隧道衬砌结构在存水空间对应的中心区域产生的裂缝较为集中,多表现为张拉型裂缝,且衬砌的劣损状态由强到弱分别为拱顶存水、拱腰存水、拱脚存水、仰拱存水。

In order to find out the influence of local void water storage space between tunnel lining and surrounding rock on tunnel lining deterioration,based on the water thermal three field coupling theory for water storage space,the water thermal coupling theoretical model is established by using the ABAQUS software,with the settlement displacement and crack distribution state of tunnel vault simulated numerically.The applicability of the theoretical model is verified by comparing the num erical simulation with the actual monitoring data.By the verified theoretical model,the progressive cracking process of lining cracks is simulated and analyzed,with the related scientific problems,such as the location of water storage space,frost heave and the change of lining concrete thickness,on the stress of tunnel lining structure,the expansion and distribution law of bad cra cks,discussed in detail.The results show that the cracks in the central area corresponding to the water storage space of the tunnel lining structure are relatively concentrated,that most of the cracks are tensile cracks,and that the deterioration state of the lining from strong to weak are vault water storage,arch waist water storage,arch foot water storage,inverted arch water storage.