Limit Analysis of Basal Heave Stability in Unsaturated Soils Based on the Unified Strength Theory

Zhang, Jia-hua; Tao, Ling; Rao, Yong-qiang; Wang, Chengyang; Yang, Wei; Xiong, Sheng; Huang, Guang Qiu

doi:10.1007/s10706-020-01481-5

Cited by 4 publications

(2 citation statements)

References 24 publications

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“…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%

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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: 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].…”

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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Face Stability of Tunnel in Multi-stratum: Limit Analysis and Numerical Simulation

et al. 2023

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Validation, Reliability, and Performance of Shear Strength Models for Unsaturated Soils

2023

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Soil shear strength is the most fundamental property when designing structures in the ground and should be carefully assessed and understood. Several empirical models were introduced to predict the shear strength of unsaturated soils. However, there is uncertainty regarding the applicability and sensitivity of these prediction models. This paper presents a comprehensive verification study to assess the reliability and validity of the existing theoretical models. The results obtained from the prediction models are compared to measured data using thirty experimental data sets. A performance classification program is also conducted to assess the suitability of the analytical models for different soil types as well as over a wide range of matric suctions, saturation degrees, soil densities, soil plasticity, and clay activity. The impact of each single parameter is clarified by the microstructure studies, which also provides insight into the mechanics of unsaturated soils. The results indicated that the applicability of models is more appropriate for sandy soils rather than for clayey ones. The performance of shear strength models tends to decrease with an increase in matric suction, initial density, plasticity index, and clay activity. It is, therefore, recommended that the shear strength estimation models should be carefully selected depending on the soil type and properties. Besides, the analysed results pointed out that the choice to assume the factor $$\chi$$ χ in the equation of Bishop equals the saturation degree is only suitable for medium-dense soils with low matric suction. This assumption is particularly not effective for clayey soils, or dense soils with high matric suction.

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Limit Analysis of Basal Heave Stability in Unsaturated Soils Based on the Unified Strength Theory

Cited by 4 publications

References 24 publications

Estimating the Basal Heave Stability of Narrow Braced Excavations

Estimating the Basal Heave Stability of Narrow Braced Excavations

Face Stability of Tunnel in Multi-stratum: Limit Analysis and Numerical Simulation

Validation, Reliability, and Performance of Shear Strength Models for Unsaturated Soils

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