基于深基坑施工的概率有限元基准模型参数修正

doi:10.13229/j.cnki.jdxbgxb.20230082

Abstract

Abstract:

In order to account for the variations in construction progress， the material parameters， connection stiffness， and boundary conditions of the deep foundation pit are modified. This results in the utilization of traditional deterministic finite element modeling parameter method being inefficient， slow， and difficult to converge. The following problem is proposed to address this issue： The probabilistic finite element parameter correction of the baseline model concept involves the establishment of a characterization of the subway deep foundation pit in the different stages of the construction of physical parameters. In essence， a finite element model is established to characterize the changing law of physical parameters in different construction stages of subway deep foundation pit. Initially， the Gaussian mixture model is employed to partition the maximum horizontal displacement of the enclosure wall into multiple clusters， thereby extracting the mean value and variance. Subsequently， the ANSYS finite element deep foundation pit model is configured， and finite element corrections are implemented on the parameters of internal support and enclosure wall of the deep foundation pit. Finally， the probabilistic baseline of the deep foundation pit finite element model for cluster analysis is obtained by using the Kriging prediction model instead of the analytical finite element. The results show that the computational rate and accuracy of the baseline model are significantly improved after the parameter correction， which can provide a theoretical basis for the subsequent numerical simulation.

Key words: geotechnical engineering, deep foundation pit, finite element, retaining wall, horizontal displacement, parameter correction

CLC Number:

TV551.4

Ya-feng GONG,Bai-xin LIU,Jian-xing YANG,Feng HE,Liang SUN,Li-hua TIAN. Parameter correction of probabilistic finite element benchmark model based on deep foundation pit construction[J].Journal of Jilin University(Engineering and Technology Edition), 2024, 54(12): 3534-3544.

Figures/Tables 10

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参数	待修正参数对象	修正前参数值	修正后参数值
θ₁	围护墙弹性模量	3.0×10¹⁰Pa	1.93×10¹⁰Pa
θ₂	混凝土支撑弹性模量	3.2×10¹⁰Pa	2.10×10¹⁰Pa
θ₃	钢支撑弹性模量	2.1×10¹¹Pa	1.74×10¹¹Pa

Parameter correction of probabilistic finite element benchmark model based on deep foundation pit construction

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