浅谈旋喷桩在风积沙隧道的应用

Application of rotary churning pile in aeolian sand tunnel

本文以青海省茶卡至格尔木高速公路脱土山隧道为依托,针对该隧道出口段围岩为风积沙,自稳性极差,易坍塌的特点,设计采取旋喷桩对地表及基础进行预加固,充分利用了旋喷桩的加固、挤密、增加含水量等作用机理,取得了一定效果,希望能为今后风积沙隧道施工提供借鉴和参考,同时也为一些不良地质路段处理施工提供了一种解决途径。

Based on Tuotu mountain tunnel of Chaka-Golmud Expressway in Qinghai province,this paper discussed the application of rotary churning pile with Aeolian sand,which have the characteristics of poor self-stability,easy to collapse.The tunnel design adopt rotary churning pile to pre-reinforce the ground and foundation with mechanism of reinforcement,compaction,increment of moisture content,and achieved certain results.The application of rotary churning pile in aeolian sand tunnel could provide reference for the future of aeolian sand tunnel construction,also provide a way to solve some bad geological sections.