The phenomenon of rock falling and water seepage results from the structure and weathering of the rocks.The rocks of the tunnel covered by Danben expressway is stable on the whole.

• 目前隧洞中局部存在小的掉块、塌落、渗水现象，其原因是由于岩体本身结构、岩体风化结果造成的，覆盖段的洞室岩体整体上是基本稳定的。