In response to the surface settlement deformation caused by the construction of a large section rectangular top pipe tunnel crossing mixed strata, finite difference software was used to analyze the surface settlement characteristics caused by the construction of a large section rectangular top pipe in five different spatial combinations of soft and hard strata, the numerical calculations results were compared with measured data, and the results were compared and analyzed with on-site measurements. By demonstrating the influence of soil layer thickness on surface settlement deformation in the combination of upper soft and lower hard strata, a modified nonlinear model was introduced to quantify the effect of soft and hard soil layer thickness on the width coefficient of settlement troughs. The main conclusions are as follows, (1) The surface settlement value increases with the proportion of the soft layer, and the deformation mainly occurs in the upper soft soil layer, and the settlement groove shape extends to both sides of the surface in a “V” shape. (2) The maximum surface subsidence is approximately linearly related to the proportion of soft soil layers, while the width coefficient of the settlement trough is non-linearly related to the proportion of soft soil layers in the cross-section. The modified nonlinear formula characterizes the influence of each soil layer on the width coefficient of the settlement trough in the combination of upper soft and lower hard strata. The coefficients of the upper soft soil layer and the lower hard soil layer are 0.475 and 0.95, 0.26 and 1.1, respectively.
He Jichun
,
Wang Hu
,
Li Dong
,
An Guanfeng
. Surface Settlement and Prediction of Large Section Rectangular Pipe Jacking Tunnel Traversing Mixed Soft and Hard Strata[J]. Chinese Journal of Underground Space and Engineering, 2025
, 21(S2)
: 968
-974
.
DOI: 10.20174/j.JUSE.2025.S2.52
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