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Probabilistic analysis of ultimate seismic bearing capacity of strip foundations 被引量:4
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作者 Adam Hamrouni Badreddine Sbartai Daniel Dias 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2018年第4期717-724,共8页
This paper presents a reliability analysis of the pseudo-static seismic bearing capacity of a strip foundation using the limit equilibrium theory. The first-order reliability method(FORM) is employed to calculate the ... This paper presents a reliability analysis of the pseudo-static seismic bearing capacity of a strip foundation using the limit equilibrium theory. The first-order reliability method(FORM) is employed to calculate the reliability index. The response surface methodology(RSM) is used to assess the Hasofer e Lind reliability index and then it is optimized using a genetic algorithm(GA). The random variables used are the soil shear strength parameters and the seismic coefficients(khand kv). Two assumptions(normal and non-normal distribution) are used for the random variables. The assumption of uncorrelated variables was found to be conservative in comparison to that of negatively correlated soil shear strength parameters. The assumption of non-normal distribution for the random variables can induce a negative effect on the reliability index of the practical range of the seismic bearing capacity. 展开更多
关键词 strip foundations Seismic bearing capacity First-order reliability method (FORM) Response surface methodology (RSM) RELIABILITY Genetic algorithm (GA)
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Analysis model for deformation mechanism of strip foundation of building:Considering shear effect of down-crossing tunnel under excavation 被引量:4
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作者 WU Ting-yao JIANG Nan +3 位作者 ZHOU Chuan-bo XIA Yu-qing ZHANG Yu-qi ZHU Bin 《Journal of Central South University》 SCIE EI CAS CSCD 2021年第8期2556-2573,共18页
When the tunnel underpasses through the building,it will cause deformation and even damage to the buildings above,and the deformation of building foundation is the key to building safety.Based on the engineering case,... When the tunnel underpasses through the building,it will cause deformation and even damage to the buildings above,and the deformation of building foundation is the key to building safety.Based on the engineering case,the theoretical analysis was employed to evaluate the influence of shield tunnel underpass construction on the stability of the building,and the optimal tunneling parameters in the field construction have been obtained through the verified theoretical model and parameter analysis.First,the strip foundation of the building was simplified to the Timoshenko beam,which was taken into account the shear effect,and then the deformation displacement of the soil at the same place of strip foundation was applied to the simplified Timoshenko beam.Finally,the numerical solution of the displacement of the strip foundation was obtained by using the finite element method and verified its reliability using Euler-Bernoulli beam theoretical model,field monitoring data,and numerical simulation.Parameters analysis for the deformation and internal force of strip foundation under different types of shield machine tunneling parameters showed that the influence of the pressure of shield excavation chamber,thrust of shield,and driving speed played an important role in the deformation of the building’s strip foundation and internal force. 展开更多
关键词 down-crossing tunnel Timoshenko beam strip foundation finite element method parameters analysis
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