复杂地层跨海隧道孤石及基岩凸起段处置措施

Treatment Measures for Boulder and Bedrock in Undersea Tunnel in Complex Stratum

以厦门轨道交通2号线一期工程海沧大道站-东渡路站盾构区间为依托工程,探寻复杂地层跨海隧道中孤石及基岩凸起的处置措施。由于该区间水文地质条件特殊,地勘准确性受限,施工中突发孤石及基岩凸起情况繁多,对地质补勘、海底摸探、浓浆制作泥膜、海上注浆加固及衡盾泥填仓保压等多种处置措施进行研究。研究结果表明,以上处置措施的综合实施可以妥善解决复杂地层跨海隧道的孤石问题,对类似工程具有指导意义。

Based on the shield section from Haicang Avenue Station to Dongdu Road Station of the first phase of Xiamen Rail Transit Line 2,the treatment measures for the boulders and bedrock in undersea tunnel in complex stratum were explored.Due to the special hydrogeological conditions in this section,the accuracy of geological survey was limited,and there were many sudden boulders and bedrock bulging during construction.Research on various treatment measures such as geological re-survey,seabed exploration,making film with thick mud,offshore grouting reinforcement and mud filling of balance shield was carried out.The results show that the comprehensive implementation of the above treatment measures can properly solve the problem of boulders in undersea tunnel in complex stratum,and has guiding significance for similar projects.