盾构隧道同步注浆新型双液注浆材料的研究与应用

Study and Application of New Type Two-component Grout to Simultaneous Grouting of Shield Tunnel

盾构隧道的上浮易导致隧道管片错台、破损、渗漏和隧道超限等问题,进而影响到地铁隧道的验收与运营。通过分析管片上浮的主要原因,提出改进同步注浆设备,并在盾尾处采用常规同步浆液与聚丙烯酰胺水溶液(双液浆)相混合注入管片与开挖面之间的空隙。通过实验分析得出,注入空隙处的双液浆短时间内增稠,浆液成为塑性体,使管片的浮力降低许多,抗水分散性明显提高。通过实际应用,此种新型双液浆有效地填充了管片与开挖面之间的间隙,使隧道上浮量明显降低,提高了成型隧道的质量,解决了盾构隧道上浮的难题。

The tunnel segment dislocation,damage and water leakage would be induced by uplift of tunnel segment. The causes of tunnel segment uplift are analyzed; the simultaneous grouting equipment is improved and two-component grout is injected to gaps between working face and tunnel segment. The testing results show that the simultaneous grouting is efficient and can reduce the uplift of tunnel segment.