Microstructural analysis and multiscale modeling for stiffening and strengthening of consolidated earthen-site soils

Zhang, Yingmin; Liu, Dong-Xu; Chen, Wenwu; Sun, Lizhi

doi:10.1016/j.culher.2022.03.005

Cited by 3 publications

(5 citation statements)

References 9 publications

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“…The porosity of the Ut sample was 40.81% [42], and the corresponding threshold decreased with the increase in magnification, indicating that the image with larger magnification contained more pores (Figure 5). As observed in Figure 6, the image magnified 2000 times contained a large pore; thus, it could not accurately represent the microstructure of soils.…”

Section: Sem Results and Acquisition Of Fem Modelsmentioning

confidence: 99%

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Micromechanics and Ultrasonic Propagation in Consolidated Earthen-Site Soils

Zhang,

Yang,

Liu

et al. 2023

Materials

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Although nondestructive ultrasonic technologies have been applied in laboratory and field tests in the field of heritage conservation, few studies have quantified the relationship among the real microstructures, micromechanical properties, and macroscopic acoustic responses of earthen-site soils. This paper develops a micromechanics-based multiscale model for quantitatively exploring the ultrasonic propagation characteristics of elastic waves in untreated and consolidated earthen-site soils. Scanning electron microscope images and image processing technology are integrated into the finite-element simulation. The effects of microstructure and wave features on the acoustic characteristics of soils are quantitatively investigated under pulsive loading. The simulation results of untreated and consolidated soils are efficiently compared to ultrasonic test data. It is demonstrated that the integration of microstructure image processing and multiscale modeling can predict the ultrasonic pulse velocity well, which improves the accuracy of laboratory testing and field monitoring and better serves the evaluation and implementation of engineering practice in the field of heritage conservation.

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Section: Sem Results and Acquisition Of Fem Modelsmentioning

confidence: 99%

“…Previous studies have shown that the static elastic modulus was smaller than the dynamic elastic modulus [39][40][41]. The static elastic modulus of the matrix was 161 MPa [42], and the dynamic elastic modulus of the matrix took 1610 MPa to predict the acoustic characteristics of the soils.…”

Section: Simulation Parametersmentioning

confidence: 97%

Micromechanics and Ultrasonic Propagation in Consolidated Earthen-Site Soils

Zhang,

Yang,

Liu

et al. 2023

Materials

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“…For saturated clay, Poisson’s ratio is in the range of 0.4 to 0.5 and the friction angle is close to 0 [ 54 , 55 ]. Poisson’s ratio was 0.44 in this study, and the Young’s modulus and yield stress of the matrix were 161 MPa and 3.32 MPa, respectively [ 48 ]. It is also noted that in the consolidation of heritage/earthen-site soils, the unconfined compressive strength is usually used to analyze the change in the strength of the heritage after consolidation, so as to evaluate the consolidation effect of the consolidants in the literature [ 10 , 56 ].…”

Section: Methodsmentioning

confidence: 98%

“…Nguyen et al [ 47 ] undertook simulations of concrete with an X-ray CT image-based model to study the failure mechanism during in situ compression. Zhang et al [ 48 ] visualized the pore distribution of consolidated earthen-site soils and simulated the UCS test by the finite element method, but did not consider the influence of pore characteristic parameters. In addition, stress wave propagation can be simulated by the finite element model [ 49 ].…”

Section: Introductionmentioning

confidence: 99%

Relation between Microstructures and Macroscopic Mechanical Properties of Earthen-Site Soils

et al. 2022

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While the macroscopic mechanical properties of earthen-site soils have undergone extensive experimental and modeling studies, few research efforts focus on the relationship between the overall mechanical behavior and micro-pore structure. We developed a microstructure-based finite element model to investigate the influence of micro-pore structure on the macroscopic mechanical behavior of earthen-site soils. Scanning electron microscopy images of the untreated and consolidated soils were processed to compare the changes in equivalent diameter, sphericity, and porosity of the soils after consolidation. According to the pore parameter range of the untreated and consolidated soils, the effects of micro-pores on the soil behavior are specifically conducted under both static and dynamic loads. The relationships between pore characteristics and stiffness, strength, and ultrasonic wave velocity are established.

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“…Since the microstructural characteristics of coral sand particles and pores are closely related to the engineering properties of coral sand, it is necessary to analyze the microstructure of coral sand for exploring the liquefactions susceptibility of coral sand. The microstructure of coral sand can be obtained by scanning electron microscope images (Seneviratne et al, 2020;Zhang et al, 2022a).…”

Section: Image Processing Of Coral Sandsmentioning

confidence: 99%

Liquefaction evaluation method of coral sand: Case study on the ports in Indonesia

Ji¹,

Ye²,

Zhang³

2023

Front. Earth Sci.

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While the liquefaction evaluation methods of siliceous sand have undergone extensive studies, few research efforts were conducted to establish standard for the liquefaction susceptibility of coral sand. The current study develops an innovative method to evaluate the liquefaction potential of coral sand. Specifically, the method integrates the grain-size distribution of coral sand, effective overburden stress and equivalent seismic acceleration. Scanning electron microscopy image of coral sand was processed to reveal the microstructural characteristics of coral sand. The correction equation for standard penetration resistance of coral sand in Indonesian ports was given based on geotechnical investigations, and the recommended values of correction factors were proposed for the regions lacking relevant data in the previous period. The process for liquefaction evaluation method of coral sand was described and applied to evaluate the liquefaction potential of coral sand in Indonesian port projects. This study demonstrates the feasibility of integrating standard penetration test and grain-size distribution for liquefaction evaluation of coral sand.

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Microstructural analysis and multiscale modeling for stiffening and strengthening of consolidated earthen-site soils

Cited by 3 publications

References 9 publications

Micromechanics and Ultrasonic Propagation in Consolidated Earthen-Site Soils

Micromechanics and Ultrasonic Propagation in Consolidated Earthen-Site Soils

Relation between Microstructures and Macroscopic Mechanical Properties of Earthen-Site Soils

Liquefaction evaluation method of coral sand: Case study on the ports in Indonesia

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