压气条件下大直径泥水盾构饱和法开舱技术

针对目前大直径盾构在水文地质条件复杂、江河湖海底部等不利环境下,排除盾构故障、清理障碍开舱方法的缺陷,提出盾构压气条件下饱和法开舱作业技术。先根据地质勘查报告了解本次盾构停机区域的地质情况,再在介绍饱和法开舱作业原理的基础上介绍掌子面压力计算、闭气泥膜的形成、饱和法盾构开舱设备及其开舱技术工艺流程等。通过工程实际应用可以得出:饱和法开舱作业可成功处理施工中遇到无法采用常规方式进行的停机检查或刀具更换等作业的施工难题,提高盾构对复杂地层的适应性,并拓宽盾构的应用范畴。

Saturated Hyperbaric Operation under Compressed Air:Case Study on Construction of Weisanlu River-crossing Tunnel by Large-diameter Slurry Shield

The existing hyperbaric operation technologies in tunneling by large diameter slurry shields under complex hydrogeological conditions and complex environment have some disadvantages In the construction of Weisanlu river crossing tunnel in Nanning, China, the shield boring has to be suspended to perform repair and maintenance of the cutterhead As a result, the technology of saturated hyperbaric operation under compressed air is proposed In this paper, the geological conditions of the tunnel where the shield stops are studied on basis of the geological prospection report, the working principle of saturated hyperbaric operation under compressed air is presented, the calculation of the pressure at the tunnel face in introduced, and the forming of the air tight filter membrane, the equipment and working procedure of saturated hyperbaric operation under compressed air are expounded The practice shows that the mentioned technology can ensure the successful inspection and replacement of the cutting tools of shield machines under complex conditions, and it can improve the adaptability of shield machines to complex geological conditions