Collapse behaviour of compacted loess: role of the stress level on soil microstructure

Ge, Miaomiao; Pineda, Jubert; Sheng, Daichao; Burton, Glen J.; Li, Ning

doi:10.3208/jgssp.v07.032

Cited by 3 publications

(1 citation statement)

References 9 publications

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“…Jing [ 6 ], Xie [ 7 ] studied the interfacial shear behavior between loess and structure from the macro and micro perspectives. Ni [ 8 ], Xu [ 9 ] and Ge M [ 10 ] compared the changes of loess microstructure before and after permeability test by SEM. Jwa [ 11 ], Jia [ 12 ] analyzed the changes of loess microstructure in tensile and infinite lateral compression tests, respectively.…”

Section: Introductionmentioning

confidence: 99%

Influence mechanism of structure on shear mechanical deformation characteristics of loess-steel interface

et al. 2022

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The mechanical properties of loess-steel interface are of great significance for understanding the residual strength and deformation of loess. However, the undisturbed loess has significant structural properties, while the remolded loess has weak structural properties. There are few reports on the mechanical properties of loess-steel interface from the structural point of view. This paper focused on the ring shear test between undisturbed loess as well as its remolded loess and steel interface under the same physical mechanics and test conditions (water content, shear rate and vertical pressure), and explored the influence mechanism of structure on the mechanical deformation characteristics of steel-loess interface. The results show that the shear rate has little effect on the residual strength of the undisturbed and remolded loess-steel interface. However, the water content has a significant influence on the residual strength of the loess-steel interface, moreover, the residual internal friction angle is the dominant factor supporting the residual strength of the loess-steel interface. In general, the residual strength of the undisturbed loess-steel interface is greater than that of the remolded loess specimen (for example, the maximum percentage of residual strength difference between undisturbed and remolded loess specimens under the same moisture content is 6.8%), which is because that compared with the mosaic arrangement structure of the remolded loess, the overhead arrangement structure of the undisturbed loess skeleton particles makes the loess particles on the loess-steel interface re-adjust the arrangement direction earlier and reach a stable speed relatively faster. The loess particles with angular angles in the undisturbed loess make the residual internal friction between the particles greater than the smoother particles of the remolded loess (for example, the maximum percentage of residual cohesion difference between undisturbed and remolded loess specimens under the same vertical pressure is 4.29%), and the intact cement between undisturbed loess particles brings stronger cohesion than the remolded loess particles with destroyed cement (for example, the maximum difference percentage of residual cohesion between undisturbed and remolded soil specimens under the same vertical pressure is 33.80%). The test results provide experimental basis for further revealing the influence mechanism of structure, and parameter basis for similar engineering construction.

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Section: Introductionmentioning

confidence: 99%

Influence mechanism of structure on shear mechanical deformation characteristics of loess-steel interface

et al. 2022

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The impact of gradual increase in moisture on the collapse of Brazilian clayey sand soil

Zanin,

Kondo,

Pelaquim

et al. 2023

Bull Eng Geol Environ

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Model for predicting evolution of microstructural void ratio in compacted clayey soils

Yin

Vanapalli

2022

Can. Geotech. J.

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The hydromechanical behavior of compacted clayey soils is significantly influenced by its microstructure. The microstructural void ratio is a key parameter that is strongly associated with the microstructural state. The objective of this study is to provide a practical and reliable estimation approach for predicting the evolution of the microstructural void ratio of compacted clays soils subjected to wetting and drying paths. In this paper, the microstructural evolution of 12 clayey soils were investigated quantitatively using the mercury intrusion porosimetry (MIP) results. Based on this study, a comprehensive criterion has been developed for identifying different pore populations of compacted clayey soils for interpreting the MIP results. The “as-compacted state line” (ACSL) was proposed to estimate the initial microstructural void ratio of clayey soils at the as-compacted state. A incremental linear constitutive model was proposed for correlating the microstructural void ratio to the “microstructural average skeleton stress” in compacted clayey soils following monotonic wetting and drying paths. The developed approach is validated by providing comparisons between the predicted and interpreted microstructural void ratios for all the examined soils. The proposed approach can be extended in constitutive modelling of the hydromechanical behavior of compacted clayey soils by incorporating explicitly the microstructural information.

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Collapse behaviour of compacted loess: role of the stress level on soil microstructure

Cited by 3 publications

References 9 publications

Influence mechanism of structure on shear mechanical deformation characteristics of loess-steel interface

Influence mechanism of structure on shear mechanical deformation characteristics of loess-steel interface

The impact of gradual increase in moisture on the collapse of Brazilian clayey sand soil

Model for predicting evolution of microstructural void ratio in compacted clayey soils

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