高水压地层顶管出洞止水环漏浆处理技术研究

Study on Slurry Leakage Treatment Technology for Water Stop Ring of the Outlet of Pipe Jacking in High Water Pressure Formation

在长距离顶管施工过程中,始发洞门可能因长期受地下水压过高、钢套环承压变形、止水胶圈长期受拉应力而失效等原因出现洞门漏浆、漏水问题,从而造成顶力陡增现象,随着顶进距离的不断增加,会出现顶不动的严重后果。为了解决高水压地层顶管出洞洞门止水环漏浆这一技术难题,笔者依托内蒙古引绰济辽工程实例分析了洞门止水环漏浆原因,介绍了一种高水压地层条件下顶管始发洞门止水环漏浆处理方法及关键技术,为类似工程提供借鉴。

In the long-distance pipe jacking construction process,the problem of slurry leakage and water leakage may occur in the starting outlet due to the over-high groundwater pressure,the deformation of steel ring under pressure,and failure of the sealing rubber under the long-term tensile stress,resulting in a sudden increase in the jacking force.As the jacking distance continues to increase,there will be a serious consequence of immobility.In order to solve the technical problem of slurry leakage of the water stop ring of the of the outlet of pipe jacking in high water pressure formation,the paper analyzes the causes of slurry leakage based on the example of the Diversion Project from Inner Mongolia to Liaoning,and introduces a treatment method and key technology for slurry leakage of water stop ring at the starting of pipe jacking under the condition of high water pressure formation,which provides reference for similar projects.