在5.12汶川地震中，龙洞子隧道汶川端洞口段遭受严重震害，其主要震害形

In the 5.12 Wenchuan earthquake, the entrance section of the Wenchuan end of the Longdongzi tunnel suffered severe earthquake damage. The main form of earthquake damage was as follows: under the action of the vibration effect, the protection of the side and the upside slope was completely damaged, and the entire side and the upside slope suffered severe landslides and collapses. , Causing the right cave door to be buried by the collapsed body of the Yangpo landslide. The earthquake damage is shown in Figure 2

In the 5.12 Wenchuan earthquake, the entrance section of Wenchuan end of longdongzi tunnel suffered serious earthquake damage. The main forms of earthquake damage are as follows: under the action of vibration effect, all the side and front slope protection were damaged, and the whole side and front slope had serious landslide collapse, resulting in the right tunnel portal being buried by the front slope landslide collapse. The earthquake damage is shown in Figure 2<br>

In the 5.12 Wenchuan earthquake, the entrance of Longdongzi Tunnel suffered severe earthquake damage. The main forms of earthquake damage are as follows: under the action of vibration effect, the protection of the side slope and the back slope were completely damaged, and the whole side slope and the back slope produced serious landslide collapse, resulting in the right cave door being buried by the landslide collapse body of the back slope. The earthquake damage is shown in Figure 2