Prediction for the surface settlement of double-track subway tunnels for shallow buried loess based on peck formula

作者：Shuangyuan Wang, Zhanping Song, Xiaoxu Tian, Yinhao Sun, Yuwei Zhang · 发表于：Frontiers in Earth Science · 年份：2023 · DOI：10.3389/feart.2023.1219544 · 被引用次数：9 · 研究领域：Geotechnical Engineering and Analysis、Geotechnical Engineering and Underground Structures、Grouting, Rheology, and Soil Mechanics

In the process of constructing double-track subway tunnels in shallow buried loess areas, the interaction of double-track tunnels is significantly influenced by the net distance and the cross-section size, which is challenging to control the surface settlement. Therefore, the surface settlement prediction is essential while constructing double-track subway tunnels in shallow buried loess areas. The paper analyzed the surface settlement law of shallow buried double-track tunnels in loess areas through theoretical research and numerical simulation. The research results show that with the decrease of the net distance, the surface settlement superimposed curve was double V shape - W shape - single V shape. When the superimposed curve is double V shape and W shape, the Peck formula was used to calculate the surface settlement curve of the single-track tunnel, then superimposed to obtain the final surface settlement curve. When the superimposed surface settlement curve was V shape, based on the Peck formula, the formula for predicting the surface settlement suitable for symmetry and asymmetry was established. The net distance ratio and the area ratio were defined, and considering the tunnel’s interaction, the value and position of the maximum were corrected. Then numerical tests were carried out 16 times with different net distance ratios and area ratios, to determine the parameters of increments and position offsets of the maximum regarding the net distance ratio and the area rati...