短台阶施工法在浅埋偏压软弱围岩隧道中的应用

Application of Short Bench Construction Method in Shallow Buried Tunnel with Unsymmetrical Pressure and Weak Surrounding Rock

以贵州省道安高速公路白沙井隧道软弱破碎围岩施工为例,介绍了短台阶施工法的施工原理、适用范围、断面尺寸、台阶长度、施工重点、关键工序和注意问题。对软弱破碎、浅埋偏压隧道变形控制、施工安全、进度保障等类似工程施工具有参考意义。

Taking the construction of the weak and broken surrounding rock of the Baishajing Tunnel of Daoan Expressway in Guizhou Province as an example,the construction principle,application scope,section size,step length,construction focus,key procedures and attention issues of the short bench construction method are introduced.It has reference significance for the construction of similar projects such as weak and broken,shallow buried and biased tunnel deformation control,construction safety,and schedule guarantee.