临江超深基坑工程施工过程实测数据分析

Study on Monitoring Data of Extra Deep Excavation by River

以南京长江隧道梅子洲工作井即一个超过25 m深度的超深基坑工程为背景,其规模宏大、施工工期紧、涉及技术领域多、综合性强、工程结构复杂,在内外高水头差作用下,周围地层易扰动变形,对邻近重要保护建筑影响极大,存在较大风险。结合施工过程中的施工工艺和实测数据,研究其变形规律和计算方法。通过本项研究,对于验证该基坑工程设计、施工方案的安全性;预测施工中可能出现的问题并能及时采取措施以防患于未然,保证施工的安全性,并对今后类似的基坑工程提供有益的借鉴。

How to control deformation economically, reasonably and efficiently as well as protect buildings around,underground pipelines and built subway tunnels has become hot issues in geoteehnical engineering research. Combined with recent cases in china, this paper studies several current problems in design and construction of extra deep excavations, such as calculation of safety and stability against upheaval, estimating the water and earth pressures, confined water control, column uplift, and so on. The development trends of these problems are discussed, and preventive measures are proposed, which provides important reference for similar foundation excavation.