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本文对上海仙霞二期四街坊六幢高层住宅楼打桩施工现场监测和理论分析,得到桩侧土体弹塑性区内超孔隙水压力的计算公式;发现在塑性区,土体中最大超孔隙水压力随深度增加而成比例地增长;打桩中土体超孔隙水压力对土体初始上覆有效应力及不排水抗剪强度有良好的归一化特性;分析了打桩结束后土体超孔隙水压力消散规律;提出在施工中应控制邻近地下结构物的不均匀变形率。
In this paper, the monitoring and theoretical analysis of the piling construction of the six high-rise residential buildings in the 4th block in Shanghai Xianxia Phase II have obtained the calculation formula of the excess pore water pressure in the elasto-plastic zone of the soil around the pile; it has been found in the plastic zone and the maximum super void in the soil. The water pressure increases proportionally with depth; the excess pore water pressure in the pile has a good normalized characteristic of the initial overlying effective stress and undrained shear strength of the soil; the soil extra pore after the end of the pile is analyzed. Dissipation law of water pressure; proposed to control the uneven deformation rate of nearby underground structures during construction.