Failure of a Retaining Structure in a Metro Station Excavation in Nanchang City, China

Feng, Shi-Jin; Lu, Shi-Feng

doi:10.1061/(asce)cf.1943-5509.0000855

Cited by 34 publications

(10 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…e deformation control of a deep braced excavation is significant for ensuring excavation stability, reducing construction costs, and protecting nearby structures and facilities. In engineering practice, the commonly adopted measures for controlling deformation of excavation are as (1) increasing the embedded depth of the retaining wall; (2) installing walls or piles between excavation and nearby structures [45,46]; (3) ground improvement; and (4) zoned and staged construction. Moreover, a simple review of the literature as presented in the above sections has indicated that soil creep can induce additional lateral wall deflections, ground surface settlements, and basal heaves.…”

Section: Countermeasures For Mitigating Detrimental Effect Of Soilmentioning

confidence: 99%

“…Deep braced excavations are ubiquitous in construction engineering such as subway stations [1][2][3], building basements [4][5][6], and launch shafts for shield tunneling machines [7,8]. To facilitate the optimizing of the excavation support system and reduce the potential adverse impact on affected infrastructures, the performance of deep braced excavations has been extensively investigated in the past several decades, on the basis of case studies [9,10], numerical simulations [11,12], centrifuge model tests [13,14], empirical or semi-empirical methods [15,16], and machine learning predictions [17,18].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Soil Creep Effect on Time-Dependent Deformation of Deep Braced Excavation

Guo

Lei

Luo

et al. 2022

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

This paper describes recent advances in the effect of soil creep on the time-dependent deformation of deep braced excavation. The effect of soil creep is generally investigated using the observational method and the plain-strain numerical simulation method. The observational method is more applicable for deep braced excavations in soft clays constructed using the top-down method. The plain-strain numerical simulation method can be conveniently used for parametric analysis, but it is unable to capture the spatial characteristics of soil creep effect on lateral wall deflections and ground movements. The additional lateral wall deflections and ground movements that are generated due to the soil creep effect can account for as large as 30% of the total displacements, which highlights the importance of considering the effect of soil creep in deep braced excavations through soft clays. The magnitude of the displacements due to soil creep depends on various factors, such as excavation depth, elapsed period, unsupported length, and strut stiffness. Parametric analyses have indicated several effective measures that can be taken in practice to mitigate the detrimental effect of soil creep on the deformation of deep braced excavation. Based on the literature review, potential directions of the related future research work are discussed. This paper should be beneficial for both researchers and engineers focusing on mitigating the adverse effect of soil creep on the stability of deep braced excavations.

show abstract

Section: Countermeasures For Mitigating Detrimental Effect Of Soilmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Soil Creep Effect on Time-Dependent Deformation of Deep Braced Excavation

Guo

Lei

Luo

et al. 2022

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

show abstract

“…e resolution of the strain gauges is r � 1με, which gives the resolution of the measuring pipe (with the spacing of the measured cross section as L 0 � 500 mm) as rL 2 0 /D 0 ≈ 0.004 mm (where D 0 ≈ 60 mm). Assuming that the error of the bending strain is δ, the displacement error of the single measuring pipe should be δL 2 0 /D 0 .…”

Section: Mechanism Of the Systemmentioning

confidence: 99%

“…e complexity of ultradeep structures in urban areas with dense existing buildings raises very serious safety risks during the construction stage. e accidents of excavation or slope collapse were reported every year in different provinces of China as well as other countries and areas with large population or complex geological conditions [1][2][3][4][5][6]. From 2015 to 2017 in China, 11.3% of the total accidents in construction projects are accounted for excavation collapse, where 68 people were killed [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

The Real‐Time Automated Monitoring System for Lateral Deflection of Underground Structures

Chen

Liang

Tang

et al. 2020

Advances in Civil Engineering

View full text Add to dashboard Cite

The lateral wall deflection is the most intuitive parameter to reveal the stability and safety of underground excavations. The existing automated approaches, such as to serialize dozens of inclinometers along casing pipes, are too expensive to be applied in most common projects. To guarantee stable automation and lower the costs, a novel system based on strain measurement is proposed in this paper to achieve real-time automated monitoring of underground excavations. The specially designed components are highlighted to benefit the mass industrial production and rapid in situ assembly. By theoretical comparisons, the accuracy and resolution performance of the proposed strategy are demonstrated to be better than those of the traditional manual method. The applicability of the mentioned system was verified by an engineering case, from which it was demonstrated that the proposed system works well to predict the lateral wall deflection of underground excavations. The sensitivity of the monitored results to the boundary conditions is also carefully discussed. The designed system has broad application prospects to provide timely data for safety assessment to prevent the unexpected failure of underground excavation as well as other engineering structures with dangerous lateral deflection or movement.

show abstract

“…Chen et al [3] indicated that the ground collapse occurred in a 15.7 m deep excavation in very sensitive clay in Hangzhou, China caused damages to the retaining structure and the water main and led to ground sinking of a road next to the excavation. Feng and Lu [4] reported that the bislurry grouting failed to stop the seepage causing a failure of retaining structure installed in very thick sand layers with a high phreatic surface during a metro station excavation in Nanchang, China. Tan and Lu [5] indicated that a flawed slab connector embedded in the silt and sand layers has been deemed as being the main cause to lead to a sudden outburst of groundwater while deepening a subway excavation in Shanghai, China.…”

Section: Introductionmentioning

confidence: 99%

Rethinking the Water Leak Incident of Tunnel LUO09 to Prepare for a Challenging Future

Cheng

Zhou³

et al. 2019

Advances in Civil Engineering

View full text Add to dashboard Cite

Incident often occurs while deepening excavation pit and/or tunnelling underground pipelines although serious attention from practitioners, engineers, and scientists has received. Prevention and mitigation of incident have thus been deemed to be the key in developing sustainable infrastructure in urban areas. This study analyses and discusses an extensive water leak incident taken place throughout the parallel tunnels LUO09 construction in the soft alluvial deposits in Kaohsiung, Taiwan. Dumping sand bags and quick-set cement intervened the incident but in vain. The water leak incident is initiated by the piping. The existing vehicle underpass causes the jet-grout columns installed not exactly in the plumb. Their overlapping is estimated to be less than the design value of 60 cm, and some seepage-prone weak zones are thus developed. The measured hydraulic gradient being equal to 12.1 and existence of seepage-prone weak zones are deemed as the main cause initiating the water leak incident. The pinhole test results highlight not only the nonplastic nature of the Kaohsiung silt but also its vulnerability to piping under large hydraulic gradients. Some bullet points that indicate what engineers should do or avoid are learned and summarised.

show abstract

Failure of a Retaining Structure in a Metro Station Excavation in Nanchang City, China

Cited by 34 publications

References 9 publications

Soil Creep Effect on Time-Dependent Deformation of Deep Braced Excavation

Soil Creep Effect on Time-Dependent Deformation of Deep Braced Excavation

The Real‐Time Automated Monitoring System for Lateral Deflection of Underground Structures

Rethinking the Water Leak Incident of Tunnel LUO09 to Prepare for a Challenging Future

Contact Info

Product

Resources

About