Behaviours of wall and soil during pre-excavation dewatering under different foundation pit widths

Zeng, Chao-Feng; Zheng, Gang; Zhou, Xiaofeng; Xue, Xin; Zhou, Haizuo

doi:10.1016/j.compgeo.2019.103169

Cited by 84 publications

(15 citation statements)

References 55 publications

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“…[2][3][4][5][6] The literature, however, is sparse with regards to the dynamic behavior of shafts, although some studies have looked into dynamic aspects of the excavation process. [7][8][9] Some results were presented for the similar case of buried reservoirs, which differ slightly from the present shaft problem in that the top of buried reservoirs lays covered and below the surface. Extensive experimental results on the seismic behavior of buried reservoirs 10,11 showed that the response of the structure is strongly dependent on its stiffness and on the way in which it is attached to the soil.…”

Section: Introductionmentioning

confidence: 55%

Dynamic response of large diameter, concrete‐lined vertical shafts under external and seismic excitation

Guerra

Labaki

Barros

2022

Num Anal Meth Geomechanics

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This article proposes a novel numerical model of the dynamic response of large diameter, concrete‐lined circular shafts, embedded in transversely isotropic soils. Excitation is given as time‐harmonic external loads applied to the base of the shaft, or vertically propagating, time‐harmonic pressure waves. The concrete lining is modeled with finite annular plate and cylindrical‐shell finite elements, while the contact tractions at the shaft–soil interface are modeled within a boundary elements framework. The response of the coupled system is obtained by imposing rigorous continuity and equilibrium conditions at the interface. The model yields accurate representation of the energy exchange between shaft and soil, as well as energy propagation through the soil as an unbounded medium. Original numerical results are presented on the response of the shaft and lining for selected geometric and constitutive parameters, frequencies and type of excitation, and anisotropic soil constitutions.

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Section: Introductionmentioning

confidence: 55%

Dynamic response of large diameter, concrete‐lined vertical shafts under external and seismic excitation

Guerra

Labaki

Barros

2022

Num Anal Meth Geomechanics

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“…Ground. e surface ground settlement curves of excavation construction can be summed up to triangular curve and groove curve [24][25][26][27][28][29]. e triangular curve always occurs in those excavations that have been excavated without the erection of strut, while the groove curve always occurs in those excavations that have been excavated with the erection of the strut system.…”

Section: Analysis Of the Vertical Displacement Of The Surfacementioning

confidence: 99%

Systematic Analysis Method for the Unusual Large Displacement in the Excavations in Soft Soil Area

Wang

et al. 2021

Mathematical Problems in Engineering

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Based on a subway station excavation construction project in the soft soil area in Nanjing, an informationized monitoring scheme was conducted during the construction of excavation, and the theories of displacement prediction were introduced into the scheme for the evaluation of the horizontal displacement of the retaining structure and the settlement of the surroundings around the excavation. Based on these theories and the monitoring data, a numerical simulation based on the commercial FEM numerical analysis software, Midas GTS NX, was conducted to simulate the whole construction process. To handle the large displacement of the retaining structure observed during the construction, the actual soil layers’ status discovered by excavating, which can reflect the physical characteristics of the soil, the construction condition, and the variation trend of the monitoring data, was used in the back analysis of the factors that induced the large deformation of the retaining structure, and the analysis result was fed back to the countermeasurement organization and design such as erecting temporary steel strut. The effectiveness of these measurements in the aspect of the reduction of the deformation rate was verified, which can provide reference to the design and construction of a similar project in soft soil area.

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“…Tan and Wei [4] attributed this phenomenon to the narrow geometry, while the numerical simulation results indicated that narrower excavation has better support system stiffness [6]. Moreover, studies [5,7] have suggested that with increasing excavation width, the deformations caused by excavation and pre-excavation dewatering first increase and subsequently tend to be stable. Logically, for narrow excavations, the support system can decrease accordingly [5].…”

Section: Introductionmentioning

confidence: 99%

“…is type of excavation shows an obvious size effect, with smaller deformation and better stability [1][2][3][4][5][6][7]. Tan and Wei [4] attributed this phenomenon to the narrow geometry, while the numerical simulation results indicated that narrower excavation has better support system stiffness [6].…”

Section: Introductionmentioning

confidence: 99%

Estimating the Basal Heave Stability of Narrow Braced Excavations

Xiao

Yang

Cai

et al. 2021

Shock and Vibration

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Engineering practices indicate that narrow braced excavation exhibits a clear size effect. However, the slip circle method in the design codes fails to consider the effect of excavation width on basal heave stability, causing waste for narrow excavation. In this paper, numerical simulation for basal heave failure of excavation with different widths was performed by FEM with SSRT (shear strength reduction technique). The results revealed that the failure mechanism of narrow excavation is different from the complete slip circle mode. In addition, the safety factor decreases increasingly slowly as the excavation widens and stabilizes when approaching the critical width. Subsequently, the corresponding computation model was presented, and an improved SCM (slip circle method) was further developed. Finally, the engineering case illustrated that it can effectively optimize the design, which exhibits clear superiority.

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Behaviours of wall and soil during pre-excavation dewatering under different foundation pit widths

Cited by 84 publications

References 55 publications

Dynamic response of large diameter, concrete‐lined vertical shafts under external and seismic excitation

Dynamic response of large diameter, concrete‐lined vertical shafts under external and seismic excitation

Systematic Analysis Method for the Unusual Large Displacement in the Excavations in Soft Soil Area

Estimating the Basal Heave Stability of Narrow Braced Excavations

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