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Shield Excavation Analysis: Ground Settlement & Mechanical Responses in Complex Strata
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作者 Baojun Qin Guangwei Zhang Wei Zhang 《Structural Durability & Health Monitoring》 EI 2024年第3期341-360,共20页
This study delves into the effects of shield tunneling in complex coastal strata, focusing on how this constructionmethod impacts surface settlement, the mechanical properties of adjacent rock, and the deformation of ... This study delves into the effects of shield tunneling in complex coastal strata, focusing on how this constructionmethod impacts surface settlement, the mechanical properties of adjacent rock, and the deformation of tunnelsegments. It investigates the impact of shield construction on surface settlement, mechanical characteristics ofnearby rock, and segment deformation in complex coastal strata susceptible to construction disturbances. Utilizingthe Fuzhou Binhai express line as a case study, we developed a comprehensive numerical model using theABAQUS finite element software. The model incorporates factors such as face force, grouting pressure, jack force,and cutterhead torque. Its accuracy is validated against field monitoring data from engineering projects. Simulationswere conducted to analyze ground settlement and mechanical changes in adjacent rock and segments acrossfive soil layers. The results indicate that disturbances are most significant near the excavation zone of the shieldmachine, with a prominent settlement trough forming and stabilizing around 2.0–3.0 D from the excavation. Theexcavation face compresses the soil, inducing lateral expansion. As grouting pressure decreases, the segmentexperiences upward buoyancy. In mixed strata, softer layers witness increased cutting, intensifying disturbancesbut reducing segment floatation. These findings offer valuable insights for predicting settlements, ensuring segmentand rock safety, and optimizing tunneling parameters. 展开更多
关键词 shield construction complex strata finite element method mechanical properties of surrounding rock segment deformation settlement prediction
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Influence and evaluation of saturated soil shield construction on existing highway
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作者 Liuqi Xu Chongfu Wu +1 位作者 Liwei Wang Shuangjun Xu 《Transportation Safety and Environment》 EI 2021年第1期72-83,共12页
In order to study the shield construction under an existing highway,the initial displacement and the excess pore water pressure solution from Biot consolidation equation were used to derive the analytical solutions of... In order to study the shield construction under an existing highway,the initial displacement and the excess pore water pressure solution from Biot consolidation equation were used to derive the analytical solutions of the vertical deformation and pore water pressure of saturated soil caused by the frontal friction and side friction of the cutterhead.In addition,by introducing the layered method and combining it with other theoretical analytical equations,the expressions of total vertical deformation and total pore water pressure caused by tunnel excavation with different overlying materials were obtained.The simulation results on an engineering project showed that the angleαbetween the direction of the road and the propulsion axis of the shield had a significant influence on the surface settlement of the road.When the angleαwas increased,the settlement curve had higher variation;but the variation would not exceed the maximum settlement value above the shield axis.When the road was perpendicular to the shield axis,a critical point of the road bulging and settlement was formed above the incision.Due to the grinding resistance of the cutterhead,the pore water pressure under the roadbed was distributed asymmetrically on both sides of the shield axis. 展开更多
关键词 shield construction saturated soil vertical deformation excess pore pressure tunnel engineering
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Study on Ground Deformation during Shield Tunnel Construction
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作者 Zhongkun Zhang 《Journal of Construction Research》 2021年第2期19-26,共8页
Through the systematic analysis of the ground settlement generated by the process of shield tunneling,the relationships between ground deformation and construction parameters are studied in this paper.Based on the ass... Through the systematic analysis of the ground settlement generated by the process of shield tunneling,the relationships between ground deformation and construction parameters are studied in this paper.Based on the assumption of linear small deformation,a mathematical model of the relationship between ground deformation and construction parameters is set up.The principle and method of optimization for estimating ground deformation is studied.The actual measured data are compared with the results of theoretical analysis in a case.Considering different ground formations in different construction sites with different adverse effects on surface and underground structures,the ground surface deformations caused by shield tunneling is an aimed topic in this paper.The contributions and research implications are the revealed relationships between the ground deformation and the shield tunneling parameters during construction. 展开更多
关键词 shield tunnel Ground settlement construction parameters Mathematical model Maximum estimation shield tunnel Ground settlement construction parameters Mathematical model Maximum estimation
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