Abstract:

 Baishiling tunnel in Shenzhen is a highway tunnel with large crosssection. The tunnel goes through fullyheavily weathered granite and Quaternary alluvial and residual soils. Due to the slightlyweathered granite spheres encountered during construction and the lack of selfsupport ability of the surrounding rock mass caused by rainfall and water infiltration of the surrounding rock mass, largescale collapses and caveins occur consequently during the tunnel construction. In the paper, the typical collapse and cavein incidents are listed, the treatment countermeasures, treatment process and treatment effects are presented, the experience and lessons in the tunnel construction are summarized and some recommendations are made.