Deterministic and reliability assessment of basal heave stability for braced excavations with jet grout base slab

Goh, Alvina

doi:10.1016/j.enggeo.2016.12.017

Cited by 44 publications

(18 citation statements)

References 24 publications

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“…As shown in Figure 1, it assumes a circular failure arc with a prescribed trajectory extending from a point at the base of the excavation in front of the pile to a point at the lowest strut level (point O) behind the pile [26]. In this method, F s can be expressed by taking moments about the lowest strut level [2,10,11,28]:…”

Section: Basal Heave Analysis For Narrow Excavationsmentioning

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 braced excavation is quite significant for design. Up to the present, it can be performed by using the limit equilibrium method (LEM) [2,[8][9][10][11][12][13][14][15][16][17][18][19], limit analysis method [9,[20][21][22][23][24], probabilistic method [2,10,[25][26][27][28][29][30][31][32], and finite element method (FEM) with shear strength reduction technique (SSRT) [2,10,15,20,[33][34][35][36][37][38][39][40].…”

Section: Introductionmentioning

confidence: 99%

“…e limit equilibrium method can be divided into two categories [15,19,21,24]: the bearing capacity method [8,9,13,16,17] and the slip circle method (SCM) [11,16,18,19]. e stability models proposed by Terzaghi [17] and Bjerrum and Eide [8] are based on bearing capacity theory [2,15,19,32,40]. For these two types of methods, factors of safety (F s ) are both defined as the ratio of the resistance over the load [15,34].…”

Section: Introductionmentioning

confidence: 99%

“…Naturally, with the continuous development of computer and numerical methods, FEM with SSRT has been widely applied to geotechnical engineering and has gradually become the mainstream numerical method and effective means for the analysis of complex engineering problems. In this way, many scholars [2,10,20,33,[35][36][37][38][39] evaluated the basal heave factors of safety for excavations and analyzed the influence of various factors.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Basal Heave Analysis For Narrow Excavationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Estimating the Basal Heave Stability of Narrow Braced Excavations

Xiao

Yang

Cai

et al. 2021

Shock and Vibration

View full text Add to dashboard Cite

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Modeling diameter of jet grouting columns using Bayesian framework

Zhao,

Chen,

Wang

2023

Num Anal Meth Geomechanics

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This study proposes a new model in explicit form to predict the diameter of the jet grouting column of three popular jet grouting systems (i.e., single, double, and triple). The proposed model can quantify the uncertainty associated with the prediction. Bayesian model selection was used to determine the optimal models and, the bootstrap sampling method was adopted to avoid bias in the collected database. The predictions agree well with the measured data, and the 95% credible intervals can cover almost all the measured data on the testing dataset, which indicates the robustness of the proposed model. A simple formula combined with a table was established to facilitate the engineers in applying the proposed model. The results reveal that soil type has a significant impact on diameter prediction. Uncertainty quantification can reveal possible fluctuations in column diameter and is vital to get a cost‐efficient design.

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