Stability Analysis of Unsaturated Soils at the End of Starting Point of Shield Tunnels after Well Dewatering
KSCE Journal of Civil Engineering, ISSN: 1226-7988, Page: 100030
2024
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Example: if you select the 1-year option for an article published in 2019 and a metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019. If you select the 3-year option for the same article published in 2019 and the metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019, 2018 and 2017.
Citation Benchmarking is provided by Scopus and SciVal and is different from the metrics context provided by PlumX Metrics.
Article Description
Based on a 3D horn failure mechanism of the face of starting point of shield tunnels, the stability of unsaturated soils at the end was analyzed via the shear strength theory of unsaturated soils with two stress state variables and the strength reduction method. Taking a variety of unsaturated soils for example, the influence of soils mechanical indices such as the effective cohesiveness, effective internal friction angle, air-entry value, and matrix suction on the safety factor and failure range was presented. The results show that, the safety factor increases linearly with the increase of the effective cohesion, effective internal friction angle and matrix suction, and the increase slope of the safety factor is drawn by the air-entry value. In addition, the effective internal friction angle significantly affects the failure range of soils at the end, and the matrix suction obviously affects the location of potential failure surfaces. It is suggested that the shear strength and matrix suction of unsaturated soils can be heightened by stratum reinforcement and drainage during the excavation process, which can effectively improve the security of soils at the end of starting point of shield tunnels. The results have been successfully applied to Nanchang metro, which can provide a reference for the safety analysis of soils at the end of starting point of shield tunnels in water-rich strata with well point dewatering in the future.
Bibliographic Details
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