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宁波某地铁出入段线工程地处深厚淤泥广泛分布地区,该地区淤泥具有高压缩性、高空隙比、低承载力、呈明显流塑软塑状的特点,这些特点给基坑施工很多方面带来了不利影响。采取了钻孔灌注桩、三轴搅拌桩围护方案,在施工过程中进行了全面详实的监测,获取了有相当价值的监测资料。结合所研究监测点的施工工况、水位及土压力变化重点分析了深厚淤泥环境下基坑测斜变形和沉降变形的规律与成因,揭示了该基坑沉降变形呈“三角形”的主要产生原因,为今后研究深厚淤泥软土工程特性以及类似工程的施工提供参考。
Ningbo subway entrance and exit of a line project is located in a deep area of widespread mud, the region has high compressibility of the slump, high void ratio, low bearing capacity, showing the characteristics of plastic flow-like shape, these characteristics of the construction of many aspects of the pit with Has come adversely. Adopted the bored piles, three-axis mixing pile envelope, in the construction process conducted a comprehensive and detailed monitoring, access to valuable monitoring data. Combined with the construction condition, water level and earth pressure changes of the monitored monitoring points, the laws and causes of pitching and settlement deformation of foundation pits under deep silt environment are analyzed emphatically. It is revealed that the main settlement of this foundation pit is “triangle” The reasons for the future study of deep silt soft soil engineering properties and the construction of similar projects provide a reference.