Displacement Characteristics of a Deep Excavation in Hangzhou Soft Clay

Mei, Yuan; Wang, Lu; Zhou, Dongbo; Fu, Liaoyuan

doi:10.1155/2022/5469471

Cited by 7 publications

(3 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Compared to the latest excavation deformation examples in Hangzhou that were not in this paper's database [15][16][17][18][19], three of them were in the silty soil area and two were in the alluvial area. The excavation depth in the siltation area case was 28.2 to 34.5 m, and the lateral deformation index ranged between 0.17% and 0.37%H, which was similar to the deformation interval of the ultra-deep excavation group in this paper.…”

Section: Comparison Of Influenceing Factorsmentioning

confidence: 97%

The Influence of Geological Conditions in the Hangzhou Bay Area on the Deformation Behavior of Deep Excavations

Zhu,

Wu,

Zhang

et al. 2023

JMSE

View full text Add to dashboard Cite

The deformation behavior of deep excavations is affected by many factors, among which the geological conditions are greatly affected. Hangzhou Bay is affected by marine siltation and river alluvium, and the geological conditions within the urban area of Hangzhou are quite different. In this paper, the geological and deformation data of 79 deep excavation cases in the Hangzhou urban area were collected, and the statistical analysis showed that the deformation control of excavations in the silt area was poor. The average maximum lateral wall displacement of deep excavations of the Hangzhou urban area was 0.41%H (H was the depth of the excavation), the average value of the alluvial area was 0.22%H, and the average value of the silted area was 0.55%H. The influence of geological conditions, wall type, and construction period on the deformation of excavations was compared, and the deformation behavior of excavations in the silted area was clearly affected by various factors.

show abstract

Section: Comparison Of Influenceing Factorsmentioning

confidence: 97%

The Influence of Geological Conditions in the Hangzhou Bay Area on the Deformation Behavior of Deep Excavations

Zhu,

Wu,

Zhang

et al. 2023

JMSE

View full text Add to dashboard Cite

show abstract

“…The FDM method was validated by comparing the results with field-monitoring data, showing good agreement in yield wall displacement and bending moment. Mei et al [28] studied the deformation characteristics of the water table, axial force, surface settlement, and lateral displacement of retaining walls in an irregular deep excavation in soft clay in Hangzhou. They simulated the excavation process using Midas GTS NX software and conducted a comprehensive comparative analysis with field measurements.…”

Section: Introductionmentioning

confidence: 99%

Study on the Analysis of Pile Foundation Deformation and Control Methods during the Excavation of Deep and Thick Sludge Pits

Wang,

Ye,

Xin

2023

Water

View full text Add to dashboard Cite

This study aims to apply performance-based safety-assessment methods to the monitoring and numerical simulation of excavation engineering projects in order to comprehensively enhance engineering risk management and decision support. In this paper, a deep excavation project in Hefei with thick silty clay layers was studied. The analysis included the surface settlement, the deformation of support structures, the vertical and horizontal displacements of pile tops, axial forces in steel braces, settlement, and the horizontal displacement of a gravity retaining wall on the south side of the excavation using field-monitoring data. A refined three-dimensional finite element model was established to further analyze the distribution of uplift displacement at the bottom of the excavation, horizontal displacement, and bending moments of piles based on simulation results. The research findings indicate that phased excavation can reduce the spatial extent of disturbance to the surrounding soil caused by excavation. Additionally, the closer the location to the excavation and the thicker the underlying silty clay layer, the faster the rate of settlement change and the greater the surface settlement. The spatial structure formed by steel braces and pile foundations effectively reduced the horizontal displacement of the engineering piles. The study’s use of field monitoring and finite element simulation provided valuable insights into the deformation of support structures and the response of the surrounding soil to excavation, confirming the rationality and applicability of the support structure in this paper. The proposed method can serve as a reference for similar complex stratum excavation design and construction. The performance-based safety assessment is introduced, and the monitoring data, numerical simulation results, and performance targets are comprehensively analyzed to provide a reliable scientific basis for engineering decision making.

show abstract

“…Terefore, numerical analysis tools, such as FlAC 3D , Midas GTS NX, and PLAXIS3D, are usually adopted to calculate stresses and deformations of the foundation pits to be excavated for the purpose of increasing analysis efciency meanwhile assuring the analysis accuracy [12][13][14][15]. At present, most numerical investigations are focused on deformations of foundation pit in soil strata or soil-rock composite strata [16][17][18][19]. Unlike foundation pit in soil strata or soil-rock composite strata, foundation pit in hard rock strata has good stability if the same supporting schemes for foundation pits in soil strata or soil-rock composite strata are adopted, which is because the surrounding rocks of the foundation pit in hard rock strata have certain strengths and antideformation abilities [20].…”

Section: Introductionmentioning

confidence: 99%

Deformation Characteristics of a Deep Subway Foundation Pit in Hard Rock Strata under a Delayed Supporting Condition

Li,

Ma,

Gao

et al. 2023

Shock and Vibration

View full text Add to dashboard Cite

In this investigation, deformations of a deep foundation pit in hard rock strata, respectively, under delayed and in-time supporting schemes of one-layer transverse reinforced concrete bracings at the top of the foundation pit, one-layer steel bracings at a depth of 8 m, and one-layer prestressed anchorages at a depth of 22.5 m during excavation were characterized according to lateral deformations of the foundation pit, settlements of the surrounding ground, and axial forces of the steel bracings according to numerical calculations and on-site monitoring. Numerical calculation results showed that the maximum lateral deformations of the foundation pit and settlements of the surrounding ground were, respectively, 10.34 mm and 8.49 mm at an excavation depth of 31 m, which were obviously larger than those under in-time supporting. Meanwhile, under delayed supporting conditions, lateral deformations of the foundation pit and settlements of the surrounding ground were far less than the allowed values, respectively, being 0.3% and 0.15% of the excavation depth, required in the Chinese standard of GB50007-2011, indicating that the foundation pit under delayed supporting conditions had good stability. Therefore, when excavating deep foundation pits in hard rock strata, proper delayed supporting schemes could be considered so that strengths of the surrounding hard rocks could be utilized to the fullest, and at the same time, more spaces for excavation could be freed up, and construction duration and construction costs could thus be lowered.

show abstract

Displacement Characteristics of a Deep Excavation in Hangzhou Soft Clay

Cited by 7 publications

References 35 publications

The Influence of Geological Conditions in the Hangzhou Bay Area on the Deformation Behavior of Deep Excavations

The Influence of Geological Conditions in the Hangzhou Bay Area on the Deformation Behavior of Deep Excavations

Study on the Analysis of Pile Foundation Deformation and Control Methods during the Excavation of Deep and Thick Sludge Pits

Deformation Characteristics of a Deep Subway Foundation Pit in Hard Rock Strata under a Delayed Supporting Condition

Contact Info

Product

Resources

About