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| Lifecycle spatial effects of super-large diameter shield working shafts in silty clay strata in the middle and lower reaches of the Yellow River |
| ZHAI Bin1, LIU Yan2,3*, LIU Junting4，YUAN Peng5, SUN Feng5，WANG Wei1，ZHANG Liangliang5，CHEN Fangyan2
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（1.Jinan City Construction Group, Jinan 250031, Shandong, China;
2. School of Civil Engineering and Architecture, University of Jinan, Jinan 250022, Shandong, China;
3. Engineering Technology Research Center on Urban Underground Engineering Support and Risk Monitoring of Shandong Province, Jinan 250022, Shandong, China;
4.The First Company of China Eighth Engineering Bureau Co., Ltd., Jinan 250100, Shandong, China;
5. China Railway SiYuan Surevy and Design Group Co.,Ltd.,WuHan 430063,Hubei, China）
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Abstract To investigate the complex three-dimensional spatial effects of super large diameter shield working shafts in typical silty clay strata of the Yellow River basin, a deep foundation pit of a shield working shaft in Jinan along the Yellow River basin was taken as the engineering background. Numerical simulation and field monitoring were adopted to systematically study the influences of different length-to-width ratios and vertical installation positions of ring frame beams on the spatial effects of the foundation pit. The deformation characteristics of retaining walls and ground settlement patterns of the shield working shaft were revealed. The results show that the maximum horizontal displacement of retaining walls and ground settlement vary most significantly when the length-to-width ratio L/B of the working shaft is less than or equal to 2. When L/B>2, the deformations tend to be stable, and the maximum horizontal displacement hardly increases with the enlargement of the long-side dimension. Compared with the construction period, the position of the ring frame beam exerts a greater influence on the foundation pit during the service period. Installing the bottommost ring frame beam near the maximum deformation zone of the retaining wall can effectively improve the overall deformation control performance. The research findings can provide a theoretical basis and practical references for the design and construction of shield working shafts under similar geological conditions.
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Received: 20 April 2026
Published: 07 September 2026
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