Measured behaviors of an oversized irregular basement excavation and its surrounding responses in thick soft clay

Liu, Guobin; Guo, Jian; Li, Mingyu; Qin, Tao; Huang, Pei Yan

doi:10.1007/s12517-019-4979-7

Cited by 9 publications

(5 citation statements)

References 37 publications

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“…Shanghai is located on the east side of China and the bedrock in Shanghai lies under thick Quaternary sediments. Hence, the main strata in Shanghai are soft silty clay and sandy clay [33]. Prior to the excavation of the tunnel, comprehensive in situ tests and laboratory experiments (e.g., cone penetration tests, boreholes, triaxial tests and oedometer tests) were conducted to investigate the surrounding and subsurface soil properties across the site.…”

Section: Geological Conditionmentioning

confidence: 99%

Experimental Study on the Soil–Structure Responses Induced by Tunnelling in Limited Space

Guo

Liu

2023

Applied Sciences

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As the economy develops rapidly, newly built tunnels in congested urban areas are becoming more and more common. Based on similarity theory, this study conducted a laboratory model test to investigate the soil–structure responses induced by the construction of a new tunnel in limited space which was formed by the existing underground infrastructures. The soil movement, convergence of the tunnel and distribution of the soil stress were explored. The test results revealed that the limited space could have a significant shielding effect on the soil movement. The maximum ground subsidence and the range of ground settlement induced by the construction of the tunnel in limited space were 60% and 40%, respectively, smaller than those induced by the construction of a tunnel at a “greenfield” site. The deformation of the tunnel was also restrained distinctly. Moreover, a soil settlement trough appeared below the bottom slab of the underground structure. The findings can shed some light on the surrounding responses induced by tunnelling in limited space in soft clay and can offer the valuable guidance for the similar projects.

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Section: Geological Conditionmentioning

confidence: 99%

Experimental Study on the Soil–Structure Responses Induced by Tunnelling in Limited Space

Guo

Liu

2023

Applied Sciences

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“…Liu et al [18] reported on a massive 10.9-15.6 m deep, 70,500 m 2 irregular pit in Shanghai's soft clay, excavated using the bottom-up method and supported by auger cast-in-place pile walls and concrete struts. The key findings include: (1) the prolonged construction and large pit scale resulted in maximum wall deflection and ground subsidence exceeding 0.86% of the final excavation depth (H e ), significantly higher than other Shanghai excavations and surpassing allowable deformation limits; (2) basal heave displayed a dome-shaped pattern with minimal distortion between adjacent columns, but maximum distortion between columns and retaining walls neared the 0.2% limit; (3) significant axial force discrepancies were noted, with some axial forces in diagonal struts being 15% over the design value due to the spatial effects of internal supports; (4) the surrounding pipelines showed three-dimensional deformation and significant settlement, with a maximum of 56 mm.…”

Section: Large-scale Deep Excavationmentioning

confidence: 99%

Influence of Different Construction Methods on Lateral Displacement of Diaphragm Walls in Large-Scale Unsupported Deep Excavation

Chiu,

Hsu,

Tsai

et al. 2023

Buildings

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This study examines the influence of different construction methods on the lateral displacement of diaphragm walls in large-scale, unsupported deep excavations. Using the three-dimensional finite element method (FEM) with PLAXIS 3D 2017 software, the research assesses how varying construction techniques impact wall stability, particularly in proximity to sensitive structures like metro systems. The project uniquely integrates peripheral top-down and central bottom-up approaches to minimize environmental disruption. Key focus areas include the roles of back-pull slabs, zoned excavation, and cross walls in reducing wall deformation. Findings reveal that zoned excavation significantly controls lateral displacement on longer site sides, enhancing adjacent structure safety and overall construction integrity. Back-pull slabs are shown to effectively decrease top wall deformation, thereby increasing structural stiffness. Moreover, despite their considerable length (nearly 60 m), cross walls play a crucial role in controlling lateral deformation along the excavation’s length. These insights offer valuable guidance for future projects, especially in regions like Taiwan, where experience with such large-scale, unsupported excavations is limited.

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“…Secondly, many literatures suggested that an experiential relationship existed between behaviors and potential geometric of the foundation pit, called data normalization processing. Several coupling relationships, between (1) the measured maximum wall deflection and excavation depth, (2) the depth where maximum wall deflection occurred and excavation depth, (3) the maximum wall deflection and the corresponding maximum ground settlement, and (4) the steel support stress and compression, are available in correlational studies [28,29]. e system is also capable to provide the operation interface to draw curves of multiple monitoring items based on the corresponding relationship.…”

Section: Curve Modeling Of Monitoring Datamentioning

confidence: 99%

Design and Application of a Digital System for Information Management and Synchronous Analysis in a Foundation Pit Group

Zhang

Xiong

et al. 2021

Advances in Civil Engineering

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When several adjacent foundation pits are excavated simultaneously and alternately, the foundation pit group has the interactions which will aggravate the excavation-induced adverse impact on surrounding environment. However, due to the massive construction information and monitoring data during excavation, the effect of interactions on performance of the foundation pits is hardly examined. In this study, a digital system is developed to manage the construction information and monitoring data of the foundation pit group. On the one hand, a visualization management system based on Autodesk Revit is developed to record information such as geometry information, excavation stages, and instrument layout. The complex construction information can be inquired dynamically. On the other hand, a dynamic and synchronous analysis system is developed based on SQL Server external database, Visio, and Excel software. The SQL Server software is capable to facilitate data classification and standardization management. The excavation process and monitoring data are fused through the secondary development of Visio and Excel software to help visualize, respectively. The developed system is applied to the foundation pit group of Shanghai World Expo Project. The lateral deflection of diaphragm walls is investigated and the rebound phenomenon of diaphragm wall is interpreted. It confirms that the developed system can improve the information management so that the deformation behavior of the foundation pit group can be analyzed efficiently.

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Measured behaviors of an oversized irregular basement excavation and its surrounding responses in thick soft clay

Cited by 9 publications

References 37 publications

Experimental Study on the Soil–Structure Responses Induced by Tunnelling in Limited Space

Experimental Study on the Soil–Structure Responses Induced by Tunnelling in Limited Space

Influence of Different Construction Methods on Lateral Displacement of Diaphragm Walls in Large-Scale Unsupported Deep Excavation

Design and Application of a Digital System for Information Management and Synchronous Analysis in a Foundation Pit Group

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