针对联络横通道与主隧道连接形成的交叉隧道结构,利用海蚀条件下衬砌混凝土的经时力学模型和塑性损伤本构模型,考虑高速列车的行驶效应,开展实测高速列车振动荷载作用下,交叉隧道结构在混凝土遭受腐蚀影响后的结构损伤分析.研究表明:列车行驶引起的主隧道压致和拉致损伤主要分布在隧道底部大约130°的区域,且主隧道的拉致损伤程度和范围相对压致损伤更大,拉致损伤最大值约为压致损伤的5.1倍;随着列车行驶速度的增大,隧道的损伤将更加显著,并朝着隧道的中上部位置发展,列车行驶速度从300 km/h提升至350 km/h,压致损伤最大值和拉致损伤最大值分别增加了53%、36%左右;联络横通道的损伤区域主要集中在其边墙和拱部.%To address the intersecting structure with the transverse passage connecting the main tunnel, the changing model of lining concrete strength under marine environment and the plastic damage constitutive model are established. Given the driving effect of high-speed train, the damage characteristics of the intersecting structure subject to concrete corrosion are analyzed based on measured vibration load of train. The results show that the pressure-induced damage and the tension-induced damage of the main tunnel caused by train running are located mainly in the region about 130 degree at the bottom of the tunnel, and the degree and extension of the damage are larger than those of the pressure-induced damage, the maximum value of the tension-induced damage is about 5. 1 times of that of the tension-induced damage;with the increase of train speed, the damage on the tunnel tends to be more obvious and develops towards the mid-upper region of the tunnel; as the train speed increases from 300 km/h to 350 km/h, the maximum values of the pressure-induced damage and the tension-induced damage are increased by 53% and 36% respectively;the damage region of connecting transverse passage is mainly focused on the sidewall and arch.
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