Reliability Assessment of Basal-heave Stability Based on Deformation Analysis
A numerical model of excavation was established in PLAXIS 2D using the Hardening Soil model.Based on the heaving deformation data at characteristic points at the bottom of the excavation,a limit state function corresponding to the over-limit failure mode of heaving deformation was con-structed.To enhance the computational efficiency,the response surface method(RSM)was em-ployed,replacing finite element calculations to quickly derive heaving deformation values at the char-acteristic points.Combined with the Monte Carlo simulation method(MCS),the reliability of the anti-heaving stability at the bottom of the excavation was conducted.The results show that the variability in the unloading-reloading modulus(Eur3)and effective internal friction angle(φ'3)of the third soil layer significantly impacted basal-heave stability.The variability in the effective cohesion(c'1),effective in-temal friction angle(φ'1),secant modulus(E501)and tangential modulus(Eoed1)of the first soil layer and the effective cohesion of the second soil layer(c'2)had a smaller impact on basal-heave stability.How-ever,the effective cohesion of the second soil layer(c'2)exhibited a relatively large influence on basal-heave stability.For deep excavations with silty soils at the base,reinforcing the soil within the excava-tion effectively constrains base heaving deformation.
Basal-heave stabilityhardening soil modelresponse surface methodMonte Carlo simula-tion method
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