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近几年,武汉轨道交通建设蓬勃发展,且该地区穿江布湖,雨水丰沛,水系发达,地下水丰富。特别是沿江、近江部分区域,具有高水位、强渗透、地质复杂等特点,因此,在此处修建深大基坑地铁车站时,风险极大,如设计或施工不当,基坑施工时将出现漏水、涌水、管涌甚至坍塌,造成人员伤亡和巨大经济损失,因此,如何保证围护结构质量和选择合适的基坑开挖方法并采取切实有效的防渗漏措施及渗漏应急管理措施,确保基坑施工安全是设计特别是施工重点关注的对象。本文以武汉轨道交通8号线三标徐家棚车站工程成功实施经验为例,介绍了在近邻长江、高水土压力、强渗透承压水复杂地质条件下的长江一级阶地深大异型基坑施工的综合施工技术,分别从超深地下连续墙各分项工程质量控制、基坑开挖方式的选择、墙缝防渗漏措施及应急管理措施等方面讲述基坑整个施工过程的控制要点及成功实施经验,为类似地质条件下的深大基坑施工提供借鉴。
In recent years, the rapid development of rail transit construction in Wuhan, and the region across the Yangtze River, abundant rainfall, developed water system, rich groundwater. Especially in the areas along the Yangtze River and the near river, with high water level, strong seepage and complicated geological conditions. Therefore, it is very risky to build a deep foundation pit metro station here. If the design or construction is improper, the construction of the foundation pit will occur Therefore, how to ensure the quality of the envelope and select the appropriate method of excavation and take effective measures to prevent leakage and seepage emergency measures to ensure that the water leakage, gushing water and piping collapse even cause the casualties and huge economic losses The construction safety of foundation pit is the object of design especially for construction focus. In this paper, taking the successful implementation of Xujiangtang station project of No. 3 standard of Wuhan Metro Line 8 as an example, this paper introduces the deep special shaped foundation pit of the first terrace of the Yangtze River under the complicated geological conditions of the adjacent Yangtze River, high water and earth pressure and strong seepage pressure water Construction of the integrated construction technology, respectively, from the ultra-deep underground continuous wall of various sub-project quality control, choice of foundation pit excavation, wall anti-seepage measures and emergency management measures and other aspects of the entire pit construction control points and The successful implementation of the experience for similar geological conditions of deep excavation provide a reference.