Optimization of Burgers creep damage model of frozen silty clay based on fuzzy random particle swarm algorithm

Abstract

The creep characteristics of frozen rock and soil are crucial for construction safety in cases of underground freezing. Uniaxial compression tests and uniaxial creep tests were performed at temperatures of − 10, − 15, − 20, and − 25 °C for silty clay used in Nantong metro freezing construction to investigate the effect law of the stress–strain curves and creep curves. However, owing to the complex effects of factors such as temperature and ground pressure, the mechanical properties of underground frozen silty clay are uncertain. The Burgers creep damage model was established by using an elastic damage element to simulate the accelerated creep stage. The traditional particle swarm optimization algorithm was improved using the inertia weight and the fuzzy random coefficient. The creep parameters of the Burgers damage model were optimized using the improved fuzzy random particle swarm algorithm at different temperatures and pressure levels. Engineering examples indicated that the optimized creep model can more effectively characterize the creep stages of frozen silty clay in Nantong metro freezing construction. The improved fuzzy random particle swarm algorithm has wider engineering applicability and faster convergence than the traditional algorithm.

Creep modeling of composite materials based on improved gene expression programming

“…The randomness and fuzziness of creep are not considered that results in the failure of classical models. So the fuzzy random method is used to improve the traditional particle swarm algorithm to obtain an efficient model to describe creep performance 41 . The operation of instrument and the test of specimen result in certain errors in the data obtained.…”

Three decades of coastal subsidence in the slow-moving Nice Côte d'Azur Airport area (France) revealed by InSAR (interferometric synthetic-aperture radar): insights into the deformation mechanism

“…Here, we use an extended Burgers creep model made up of a series of Maxwell and Kelvin bodies (Jiang and Wang, 2022) to reproduce the InSAR observations. Such a viscoelastic model was previously employed to model soil deformation (Yao et al, 2021), fault relaxation after earthquakes (Sun and Wang, 2015), and landslide creep (Zou et al, 2013;Liao et al, 2022) and is often used in geology to illustrate the effects of both strain and stress relaxation. The transient creep (δ) with time (t) is analytically calculated as follows:…”

28 years of coastal subsidence evolution on the slow-moving Nice-Côte d’Azur airport area (France) revealed by InSAR: Insights into the deformation mechanism

“…Here, we use an extended Burger's creep model made up of a series of Maxwell and Kelvin bodies to reproduce the observations. Such viscoelastic model was previously employed to model soil deformationYao et al (2021), fault relaxation after earthquakesSun and Wang (2015), landslide creepZou et al (2013), and is often used in geology to illustrate the effects of both strain and stress relaxation. The transient creep (δ) with time (t) is analytically calculated as follows:…”