Modelling desiccation crack geometry evolution in clayey soils by analytical and numerical approaches

Vo, Thi Dong; Pouya, Ahmad; Hemmati, Sahar; Tang, Anh Minh

doi:10.1139/cgj-2018-0105

Cited by 22 publications

(6 citation statements)

References 40 publications

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“…This simplifies the problem and allows studying only one half of a periodic cell containing a crack. In reality, the cracking pattern evolves to form sequentially different families of cracks . First, primary cracks are developed dividing the soil surface into cells, and then subsequent drying tends to subdivide these cells in the form of secondary and tertiary crack families.…”

Section: Discussionmentioning

confidence: 99%

“…In reality, the cracking pattern evolves to form sequentially different families of cracks. 8,75 First, primary cracks are developed dividing the soil surface into cells, and then subsequent drying tends to subdivide these cells in the form of secondary and tertiary crack families. In addition, the crack patterns observed experimentally by Peron et al 34 showed that the crack network formation can result from the combination of two processes, "sequential infilling" and "simultaneous growing," since the cracks tend to appear either successively or simultaneously.…”

Section: Discussionmentioning

confidence: 99%

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Modeling soil desiccation cracking by analytical and numerical approaches

Pouya

Hemmati

et al. 2018

Num Anal Meth Geomechanics

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Summary An energy approach is proposed as a complement to the stress approach commonly considered for investigating soil desiccation cracking. The elastic strain energies before and after crack initiation are estimated by both numerical and analytical solutions. The energy released by cracking is then compared with the fracture energy to discuss crack initiation conditions. This leads to combined energy and stress conditions for crack initiation following Leguillon's theory. An approximate analytical solution is derived from a variational formulation of the porous elastic body equations. A cohesive zone model and finite element code are used to simulate crack propagation in an unsaturated porous body. This analysis shows that the energy criterion is reached before the stress criterion, and this can explain unstable crack propagation at the beginning. The approximate analytical solution allows predicting correctly the crack depth and opening in its initiation stage.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Modeling soil desiccation cracking by analytical and numerical approaches

Pouya

Hemmati

et al. 2018

Num Anal Meth Geomechanics

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“…In recent years, increasing attention has been given to the problem of cracks in geotechnical and geological engineering (Baer et al, 2009;Shin and Santamarina, 2011;Hirobe and Oguni, 2016;Tollenaar et al, 2017;Vo et al, 2017;Wang et al, 2017;Pouya et al, 2018;Tang et al, 2018;Vo et al, 2018;Wang et al, 2018;Li et al, 2019;Ruan et al, 2021). Obtaining the geometrical parameters of the primary crack after development, especially the depth, can be used to control engineering disasters in a more accurate, efficient and economical way.…”

Section: Introductionmentioning

confidence: 99%

Study on the electric resistance method in crack depth measurements

Chen²,

Yu³

et al. 2023

Front. Earth Sci.

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Obtaining geometric parameters, especially depth, and describing the morphological characteristics of cracks are of great significance to control engineering disasters and accidents caused by cracks. The electric resistance method is based on the principle of differences in electrical properties between cracks and soil, which could be used to measure the single crack depth at project sites. There exists an Rmin value corresponding to a specific electrode distance d value at each Rf-d value obtained by laboratory experiments. Furthermore, a two-dimensional finite element model of soil with a single crack is established to carry out numerical simulation analysis considering the crack width W, crack depth D and complex crack conditions. The results reveal dynamic variation rules of soil resistance after crack development, and for each Rf-d value, the electrode distance d value corresponding to the Rmin value is approximately equal to the crack depth D. In the range of the electric field, the offset and rotation of the crack have little effect, while the measurement results have a strong dependence on relocation movement. The regulation gives guidance to the inversion analysis of crack depth D at project sites and has been applied in crack depth measurements of an expansive soil slope. The electric resistance method as a proposed integrated approach is of great significance and brings new perspectives into the study of crack depth measurements for field applications.

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“…The modelling could capture the essence of desiccation in terms of residual soil height, the number of cracks formed, crack initiation moisture content, and the widths of cracks. Vo et al [15] used finite element code, including cohesive joints, for investigating crack initiation and propagation along with the formation of the crack family. Numerical modelling, though tending to simulate physical processes more accurately, comes in the cost of time and complexity.…”

Section: Introductionmentioning

confidence: 99%

Determining Shrinkage Cracks Based on the Small-Strain Shear Modulus–Suction Relationship

et al. 2019

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This research aims to propose the use of spectral analysis of surface wave (SASW) tests along with in-situ suction measurements for non-destructive determination of shrinkage cracks. The underlying principle behind this proposed method is that, while suction and the small-strain shear modulus are positively correlated for intact samples, this is not the case for cracked ground. A series of SASW tests were performed on a clay embankment at different periods, during which the suction, modulus, and shrinkage crack depth varied seasonally. The soil water retention curve (SWRC) of the undisturbed sample collected from the cracked zone was determined, which related the suction-to-moisture content and void ratio of the soil. A free-free resonant frequency (FFR) test in the lab was conducted to determine the small-strain shear modulus (G0) at various moisture contents. The small-strain moduli from the SASW tests on the intact ground were generally higher than those from the FFR tests due to the effect of confining stress. A drop in the small-strain modulus determined using the SASW test was observed as an increase in suction-induced cracks and it relieved the horizontal stress. The crack depth measured in the field was then modelled using a semi-empirical procedure that can be used to predict crack depth relative to suction.

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Modelling desiccation crack geometry evolution in clayey soils by analytical and numerical approaches

Cited by 22 publications

References 40 publications

Modeling soil desiccation cracking by analytical and numerical approaches

Modeling soil desiccation cracking by analytical and numerical approaches

Study on the electric resistance method in crack depth measurements

Determining Shrinkage Cracks Based on the Small-Strain Shear Modulus–Suction Relationship

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