大断面、不良地质隧道施工的坍方，几乎是不可避免的。对成渝公路重庆段隧道施工中出现的坍方，按其规模大小提出了处理原则与措施，在总结施工坍方经验的基础上，还提出了预防坍方的设计，收到了预期的效果。 Large cross-section, poor geological tunnel construction of the collapse, is almost inevitable. On the basis of summarizing the experience of collapse in construction, the collapse of tunnels in the section of Chongqing section of Chongqing-Chongqing Highway was proposed according to the size of the landslide. The design of collapse prevention was also put forward and the expected effect was received.