为探究隧道盾构斜下穿邻近既有桥梁桩基施工引起的桩基变形规律,以圆形截面桩为例,考虑桥梁桩基与盾构隧道之间相对位置关系的影响,利用Kerr梁地基模型、差分进化算法和能量变分法,建立盾构隧道斜下穿施工引起邻近桩基变形预测模型,通过施工现场的监测结果验证预测模型的工程适用性,并对不同方法预测结果与实测结果之间的差异性进行误差分析。结果表明:本文模型可预测不同位置下穿邻近桩基施工引起的桩基水平和竖向位移,并可用于正下穿和斜下穿两种工况,工程适用范围较广泛,且预测结果与监测结果的最大误差均不超过20％的工程误差限值,具有良好的工程适用性;本文模型在Kerr梁地基模型条件下,同时考虑了桩-隧相对位置关系,并有效设定了剪切层参数c,相比其他方法,在预测精度上明显提升,可为类似隧道盾构下穿施工引起邻近桩基变形控制提供理论指导。
In order to investigate the deformation law of pile foundation caused by the construction of a tunnel shield that obliquely penetrating into the pile foundation of adjacent existing bridges, the influence of the relative positional relationship between the bridge pile foundation and the shield tunnel is considered by taking the circular cross-section pile as an example. Using the Kerr beam foundation model, differential evolutionary algorithm and energy variational method, a prediction model for the deformation of adjacent piles caused by the diagonal tunneling of the shield tunnel is established. The engineering applicability of the prediction model is verified by the monitoring results at the construction site, and the discrepancy between the prediction results of different methods and the measured results is analyzed in terms of error. The results show that the model can predict the horizontal and vertical displacements of pile foundations caused by the construction of pile foundations at different locations, and can be used in two working conditions, positive underpassing and diagonal underpassing, with a wide range of engineering applicability, and the maximum error between the prediction results and the monitoring results does not exceed the 20% engineering error limit, which is of good applicability to the project. Under the condition of Kerr beam foundation model, the model in this paper also considers the relative position relationship between pile and tunnel, and effectively sets the shear layer parameter c. Compared with other methods, the prediction accuracy is significantly improved, which can provide theoretical guidance for the deformation control of adjacent piles caused by similar tunnel shield tunnel underpassing construction.
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