Abstract Although there are many studies on the impact of tunnel on the surrounding environment, most of them focused on the circular tunnels but very few on U-shaped tunnels. In order to obtain a better understanding of the impact of U-shaped tunnel excavation on the ground and adjacent pile foundations, a simplified analytical method is developed in this work. The U-shaped tunnel is projected into a unit circle using conformal mapping method. The displacement and stress of the soil around the tunnel are solved analyzed. The settlement of a single pile is obtained by the complex variable function and the load transfer method. The influence of grouting is considered in the calculation. The analytical solution is verified by the simulation results given by an equivalent numerical model and validated with the field-measured data in an engineering case in Beijing.

中文翻译：

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地基及相邻桩对U型隧道开挖的响应

摘要 虽然关于隧道对周边环境影响的研究较多，但多集中在圆形隧道上，而对U型隧道的研究较少。为了更好地了解 U 形隧道开挖对地面和相邻桩基的影响，本文开发了一种简化的分析方法。U 形隧道采用共形映射方法投影成单位圆。分析了隧道周围土体的位移和应力。单桩沉降通过复变函数和荷载传递法求得。计算中考虑了注浆的影响。