地下通道竖井垂直喷锚支护施工中渗水问题的处理与监测

Treatment and Monitoring on Seepage of Vertical Shaft Supported by Vertical Anchor-jetting during Underground Passage Construction

竖井作为地下通道施工中的重要组成部分,其安全施工是地下通道顺利开挖施工的基础。武汉市武胜东街地下人行通道竖井采用垂直喷锚支护,施工过程中出现了竖井侧壁持续渗水并发生地表急剧沉降的问题。设计及施工方根据地表沉降及深层水平位移监测数据,及时采取了局部注浆和反漏等处治措施。监测结果表明,所采用的支护方案可行,监控方法能及时有效地为竖井安全施工提供合理可靠的信息反馈,可为类似地下水丰富的地下通道竖井工程施工提供参考。

The vertical shaft is an important component in the construction of the underground pedestrian pass in urban areas and its safe installation is essential to the success of the underpass construction.The construction of the underground pass at Wusheng Road East in Wuhan utilized the ground anchors with shotcrete as the vertical support measure.The steady seepage at the shaft walls and a sudden ground subsidence were encountered during the construction.The local grouting and other seepage stoppage measures were used based on the construction monitoring data on the extensometers and surface settlement points.The results indicate that the mitigation measures are appropriate.The construction monitoring can provide a viable and reliable feedback of the construction,and is a vital measure to a safe construction of underground pedestrian pass.