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浅覆土工况下的盾构隧道,因其埋深较浅,推进过程中会引起较大的土体位移,导致邻近建筑桩基产生较为明显的附加内力和变形。针对此类工程问题,本文采用Loganathan解答估算隧道开挖引起的土体水平自由位移场,然后基于最小势能原理和Winkler地基模型,考虑地基土的成层特性,建立能量变分控制方程进行求解。通过参数分析,研究浅覆土隧道穿越对邻近建筑桩基水平性状的影响。分析结果表明,隧道埋深和地层损失比对邻近建筑桩基的安全有着重要的影响。
Because of its shallow depth, the shield tunnel under shallow overburden conditions will cause large displacement of soil during the propulsion process, resulting in obvious additional internal forces and deformation of the pile near the building. In order to solve this kind of engineering problem, Loganathan solution is used to estimate the horizontal free displacement field caused by tunnel excavation. Then based on the minimum potential energy principle and Winkler foundation model, considering the stratification of foundation soil, the governing equations of energy variability are established. Through parametric analysis, the influence of the tunneling of shallow caving soil on the horizontal behavior of pile foundations in adjacent buildings is studied. The analysis results show that the tunnel depth and formation loss ratio have an important influence on the safety of pile foundations in adjacent buildings.