三台阶临时仰拱法在滇中红土泥岩隧道中的应用

The application of the three steps of temporary inverted arch in clay shale tunnel of Yunnan

针对滇中红土泥岩隧道围岩节理发育、岩质软、浸水后易软化崩解、岩体较破碎,隧道施工难度较大的问题,提出了三台阶临时仰拱快速施工方法,现场实践表明:在保证施工质量和施工安全的前提下,三台阶临时仰拱法可有效缩短隧道施工对项目整体工期的影响,经济效益和社会效益显著,对类似地质条件下隧道的施工具有借鉴意义。

For the central Yunnan laterite mudstone tunnel surrounding rock,the joint development,soft rock,easy to soften disintegration after flooding,the more broken rock,the tunnel construction difficult problems,puts forward the three steps temporary invert fast construction method,the field practice shows that： on the premise of guarantee construction quality and construction safety,three steps of temporary inverted arch method can effectively shorten the tunnel construction to the influence of the whole project construction period,economic benefit and social benefit is remarkable,especially the similar geological conditions,it has reference significance to the construction of the tunnel.