广州地铁芳白城际铁路攻克岩溶强发育地质风险|大肉大捧一进一出两腿间视频
中新网广州9月28日电(王华 李哲峰 代锋)广州地铁集团28日消息,芳白城际夏茅站主体结构已封顶,夏茅站基坑范围内岩溶见洞率高达93%,建设者们多措并举,成功攻克岩溶强发育地质风险,解决施工难题。

截至目前,芳白城际铁路(芳村—白云机场北)土建工程累计完成51%。10座车站中,6座已封顶,4座进行土建施工;10个区间中,2个已经贯通,6个进行土建施工,2个进行前期准备。
其中,夏茅站长430米、标准段宽35.5米、基坑深度约30米,为地下三层框架结构,总建筑面积近5.4万平方米,相当于36个标准篮球场大,是全线炭质灰岩地层中规模最大的车站。
勘察数据显示,夏茅站基坑范围内岩溶见洞率高达93%,最大溶洞高度达40米,单体大型溶洞和串珠状溶洞普遍存在,分布不规则,基坑开挖过程中面临涌水、涌砂及围护结构失稳等问题。
车站处于栖霞组地层与第四系地层交叠区域,地层呈现“上砂下岩”特征,富水砂层厚度超10米。同时,基坑周边水系发达,承压水极为丰富,施工中易发生流砂现象。基坑围岩为微风化灰岩,受周边复杂环境及溶洞区地质敏感性的制约,常规爆破工艺难以实施。车站周边还分布有多栋建筑群和十余类地下管线,并紧邻三条城市主干道,施工难度较为突出。
面对多重挑战,广州地铁联合中国建筑芳白城际总包部、中建二局构建“地质—结构—工艺”三维风险预控体系,量身定制施工方案。
针对溶土洞发育的地质情况,建设者们在基坑开挖前,创新采用“电渗法+跨孔电阻率成像”组合技术,对围护结构进行“地下水渗漏及绕流”检测,精准识别薄弱环节并提前实施注浆封堵。
此外,建设者们还运用微差爆破松动技术,解决高强度硬岩爆破难题,有效控制爆破噪音及冲击效应,并灵活调整爆破窗口期,最大限度减少对周边环境的影响。现场共布设1200多个监测点,24小时实时监测关键数据,为基坑安全开挖提供科学依据和数据支撑。(完)
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