米拉湾卵石土隧道塌方处理方案

Mila Bay Pebble Soil Tunnel Collapse Treatment

兰新铁路米拉湾隧道位于青海省民和县境内,隧址埋深浅,土体为卵石土,围岩自稳性较差,在开挖过程中局部出现坍塌、冒顶情况。针对该隧道地质条件和处理塌方工程实践,着重论述了铁路隧道卵石土塌方处理施工技术,并介绍了处理卵石土隧道施工中采用大管棚超前支护,尽早封闭成环,加强监控量测工作,以及加强施工管理等措施,对类似隧道施工具有一定的借鉴意义。

Lanzhou-Xinjiang railway Mila Bay Tunnel, located in Minhe County, Qinghai province, is characterized by shallow buried depth, soil and gravel soils, poor stability of surrounding rocks, partial collapse and roof fall occurred during construction. In light of the geological conditions and tunnel collapse treatment engineering practice, the paper highlights pebble soil collapse treatment in railway tunnel construction and discusses treatment of gravel soil tunnel construction with large pipe-shed advanced support, closed into a loop as soon as possible, strengthening the monitoring and measuring work, as well as strengthening construction management measures for reference of similar tunnels construction.