Please translate the following sentence into English according to the style of SCI journals升温阶段火灾导致隧道内部混凝土受热膨胀隧道外部混凝土受拉开裂；降温阶段隧道内部受火面开裂。在这种内外交替开裂的模式下沉管隧道容易形成贯穿裂缝。

During the heating stage, the fire caused thermal expansion of the concrete inside the tunnel and tensile cracking of the concrete outside the tunnel; during the cooling stage, the inside of the tunnel experienced cracking due to the fire surface. In this mode of alternating internal and external cracking, the immersed tube tunnel is prone to form penetrating cracks.