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文章以某高速公路偏压洞口段黄土隧道滑塌为工程背景,分析了滑塌发生的原因。综合采用洞外反压回填和洞内临时横撑相结合的处治方法,在超前小导管预加固作用下,通过采用短台阶弧形导坑法施工,成功通过洞口滑塌段并实现了安全进洞。工程实践表明,反压回填和加强临时支护及时封闭成环是处治偏压洞口段黄土隧道滑塌的有效措施。
In this paper, based on the engineering background of slump of loess tunnel under the bias pressure of a highway, the cause of the slump is analyzed. Based on the combination of the backhole external backpressure and the temporary cross brace in the tunnel, under the pre-reinforcement of small lead pipe, the tunnel is successfully passed through the hole and the safety is achieved through the construction of the short step arc guide pit method hole. Engineering practice shows that the back pressure backfill and temporary support to strengthen the timely closure of ring formation is an effective measure to treat the landslide in the loess tunnel with bias pressure.