渝湘高速公路正阳隧道塌方治理方案研究

Study on Tunnel Collapse Treatment of Yuxiang Highway

摘要:

塌方一直是我国隧道建设领域研究的热点问题。从施工过程中冒顶塌方形成经过、产生塌方原因入手，对渝湘高速公路正阳隧道一次塌方事故提出治理方案，认为岩隙渗水作用于覆盖层较薄、渗透性强的松散破碎地段使隧道上方岩土体的自稳能力恶化；通过坍口设置截水沟及多种形式注浆技术，及时加固坍塌体，封堵岩隙渗水。方案效果良好，具有一定借鉴意义。

Abstract:

Tunnel collapse has been a key issue in the tunnel construction field in China. A treatment method was formed for a collapse in Zhengyang Tunnel of Yuxiang highway based on the formation process of roof fall and the cause of collapsing accident in the construction. Self-stability of the surrounding rock above the tunnel is exacerbated by the affection of the thin overburden layer and weak stratum of rock with the groundwater in cranny. A channel is constructed around the mouth of collapse to strengthen the collapsing section and succeeded to seal the seepage water.