This study investigates the evolution characteristics and influencing factors of surrounding rock pressure during shield tunneling in deep soil layers, based on a new shield tunnel project. Using FLAC3D numerical simulation, a three-dimensional model was established to simulate key construction processes including excavation face support, shield shell effect, synchronous grouting, and segment assembly. The analysis focuses on ground loss rate, arching effect evolution, and distribution characteristics of surrounding rock pressure. The results indicate that: The variation of surrounding rock pressure during shield advancement can be divided into three stages: cutterhead influence, shield shell passage, and tail void grouting, with the grouting stage exhibiting a significant increase in ground loss rate; In deep soil layers, the surrounding rock pressure is predominantly governed by the combined effect of “pressure arch” and “friction arch”, where the arching zone is distributed around the tunnel shoulders while the loosening zone is located at the crown; Synchronous grouting pressure has a notable impact on both ground loss rate and surrounding rock pressure, whereas the influence of excavation face support pressure is relatively minor. The findings provide a theoretical basis for optimizing the design and construction of similar projects.
Zhang Xia
,
Yang Xiaolong
,
Xiang Tianbing
,
Wang Yibing
. Evolution and Influencing Factors of Surrounding Rock Pressure in Deep Buried Soft Soil Shield Tunnels[J]. Chinese Journal of Underground Space and Engineering, 2025
, 21(S2)
: 794
-802
.
DOI: 10.20174/j.JUSE.2025.S2.31
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