为解决滑坡处隧道进洞难的问题，以云南大关至永善高速公路椿坪2号隧道出口段为依托，结合场区工程地质条件，开展滑坡成因和治理前稳定性分析，据此提出针对坡体-隧道斜交体系的综合治理措施，采用数值模拟分析滑坡治理效果，评价隧道结构安全性。得到以下结论： 1）隧道洞口处坡体在天然或暴雨状态下安全性较低，“反压回填+抗滑桩+锚索”的滑坡治理措施具有综合效益。2）采用“反压回填”治理后，滑坡体在天然工况下稳定，但暴雨工况下不稳定； 继续采用“抗滑桩+锚索”治理后，滑坡体在暴雨工况下稳定。3）采用桩基并注浆、双层超前大管棚的预处理措施可确保明洞施工安全性，滑坡对隧道出口段结构主要影响范围为20 m。

 It is difficult to construct a tunnel in landslide area. As a result, a case study is conducted on the exit section of the Chunping No. 2 tunnel of the DaguanYongshan expressway in Yunnan, China, and the causes of landslide and the stability before treatment are analyzed according to geological conditions. Based on this, the comprehensive treatment measures for the slopetunnel oblique intersection system are proposed, and the effect of landslide treatment is analyzed by numerical simulation, so as to evaluate the safety of tunnel structure. The results show the following: (1) The slope at the portal of the tunnel has low safety under the condition of nature or rainstorm. The landslide control measures of "reverse pressure backfill + antislide pile + anchor cable" are comprehensively beneficial. (2) After backfilling treatment, the landslide body is stable in natural condition, but unstable in rainstorm condition. After treatment of antislide pile + anchor cable, the landslide body can remain stable under the rainstorm condition. (3) The pretreatment measures of pile foundation and grouting and doublelayer advance large pipe shed can ensure the safety of opencut tunnel construction. The main influence range of landslide on the tunnel exit section structure is 20 m.