顺层岩质边坡隧道洞口挤压变形处治技术研究

Research on Treatment Technology of Tunnel Portal Extrusion Deformation in Bedding Rock Slope

针对顺层岩质边坡隧道洞口挤压变形,采用现场勘探、理论分析,对顺层岩质边坡隧道洞口挤压变形机制及处治技术进行研究。结果表明:顺层岩质边坡具有突发性强、发展速度快、破坏性大、处治难度大的特点,隧道地质选线时应尽量绕避;地表水及地下水对岩质顺层边坡失稳滑移具有催化作用;确定了反压回填、增设抗滑桩、增设临时钢支撑、接长明洞、加强监控量测等措施的综合处治体系,取得较好处治效果。本文研究成果可为今后类似灾害处治提供参考。

In view of the tunnel portal extrusion deformation of bedding rock slope,the mechanism and treatment technology of tunnel portal extrusion deformation of bedding rock slope are studied by field exploration and theoretical analysis.The results show that the bedding rock slope has the characteristics of strong suddenness,rapid development,great destructiveness and difficult treatment.The geological route selection of the tunnel should be avoided as much as possible.The surface water and groundwater have catalytic effect on the instability and sliding of the bedding rock slope.The comprehensive measures such as back pressure backfilling,adding anti slide piles,adding temporary steel support,extending open tunnel and strengthening monitoring and measurement are determined.The treatment system has achieved better treatment effect.The research results can provide reference for the treatment of similar disasters in the future.