Experimental study on soil-water characteristic curve for silty clay with desiccation cracks

Li, Jinhui; Lu, Zhenyong; Guo, Lin; Zhang, Li Min

doi:10.1016/j.enggeo.2017.01.004

Cited by 57 publications

(22 citation statements)

References 23 publications

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“…In another sense, soil crack is a major concern in engineering. Cracks affect the hydraulic and mechanical properties of soils forming landfill liners, slopes, and dams [19]. The crack network considerably modifies the soil's structure and impacts its hydraulic behavior by creating preferential flow paths for fluids and contaminants.…”

Section: Introductionmentioning

confidence: 99%

Correlation between Spectral Characteristics and Physicochemical Parameters of Soda-Saline Soils in Different States

Ren

Zhao

et al. 2019

Remote Sensing

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The spectral features of soils are a comprehensive representation of their physicochemical parameters, surface states, and internal structures. To date, spectral measurements have been mostly performed for powdered soils and smooth aggregate soils, but rarely for cracked soils; a common state of soda-saline soils. In this study, we measured the spectral features of 57 saline soil samples in powdered, aggregate, and cracked states for comparison. We then explored in depth the factors governing soil spectral features to build up simple and multiple linear regression models between the spectral features and physicochemical parameters (salt content, Na+, pH, and electronic conductivity (EC)) of saline soils in different states. We randomly selected 40 samples to construct the models, and used the remaining 17 samples for validation. Our results indicated that the regression models worked more effectively in predicting physicochemical parameters for cracked soils than for other soils. Subsequently, the crack ratio (CR) was introduced into the regression models to modify the spectra of soils in powdered and aggregate states. The accuracy of prediction was improved, evidenced by a 2–11% decrease in the parameters mean absolute error (MAE).

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Section: Introductionmentioning

confidence: 99%

Correlation between Spectral Characteristics and Physicochemical Parameters of Soda-Saline Soils in Different States

Ren

Zhao

et al. 2019

Remote Sensing

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“…This new result confirms that many desiccation cracks evolve in mixed-mode I-mode III ( Figure 7) and not only in mode I, as measured in previous results on clayey geomaterials. 13,28 Contrary to many studies, 31,32 which transform grayscale images to binary images to calculate the crack area (CA) called crack intensity factor or surface crack porosity, H-DIC uses calculated jumps (u 0 , v 0 ) to localise the desiccation cracks pixel by pixel ( Figure 7) and to calculate CA from o values. CA was calculated using the following equation:…”

Section: Applications To a Real Casementioning

confidence: 99%

Subpixel precision of crack lip movements by Heaviside‐based digital image correlation for a mixed‐mode fracture

Hedan

Valle

Cosenza

2020

Strain

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This study reports on the Heaviside-based digital image correlation (H-DIC) procedure and its application in fracture analysis. This improved DIC procedure was proposed to solve the uncertainty problems at the vicinity of the crack and to evaluate the opening and shear movements of crack lips and the orientations of cracks in the subset. Some tests were conducted to demonstrate the performance of the H-DIC algorithm. An application on argillaceous rock mass exhibiting multiple mixed-mode fractures is shown to validate the efficiency and robustness of the proposed method. This application consisted in processing images acquired from an experimental investigation performed in a gallery front submitted to climatic seasonal variations. The results illustrated how the H-DIC procedure enables to localise and to quantify the opening, shearing and orientation of subpixel cracks. A sensibility study performed on the opening and shear components demonstrated that the precision of crack aperture by H-DIC procedure is close to 0.14 pixel and the spatial resolution is equal to one pixel. Moreover, the crack area was calculated from local apertures on a monitoring duration of 1 year, and a maximum value of 595.8 mm 2 in winter was obtained. K E Y W O R D S crack area, crack orientation, digital image correlation, fractured structure, full-field measurement, lip displacements, mixed-mode fracture 1 | INTRODUCTION Desiccation cracking, which results from the heterogeneous spatial organisation of tensile stresses, the heterogeneities of mineralogy or the orientation of swelling clay particles inside geomaterials, modifies the hydraulic properties of clayey geomaterials (e.g., Vogel et al, 1 Coppola et al, 2 and Baer et al 3). Consequently, the water movement and solute transport in unsaturated cracked clayey soils become more complicated to describe and model. Indeed, models regarding water movement in cracked soils further require both dynamic crack patterns and varying hydraulic descriptions. 3,4 Thus, knowledge about the crack morphology seems indispensable for modelling the soil cracking mechanism and water transport in unsaturated cracked soils. 4,5 In recent years, the measurement of crack patterns has evolved from field measurements to automatic recognition and quantification using digital image analysis. Researchers frequently use digital imaging methods for crack quantification, 3-5 wherein superficial crack patterns are quantified using geometric and morphological indexes. Two limits of the previous approaches based on digital imaging methods are (i) the precision of desiccation crack detection (always greater than or close to 1 pixel) and (ii) their application being limited to

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“…Desiccation cracks in clayey soils have been observed in situ by many researchers [5,9,10,[15][16][17][18], where the characteristics of cracks, such as depth, area, width, and crack ratio, under the drying environments were analyzed. Laboratory experimentations have mainly concentrated on the behaviors of clayey soil when specimens are dried from a saturated state [6,7,[19][20][21][22][23][24][25][26][27]. Indeed, there are many factors that influence crack formation and propagation such as drying conditions (temperature, relative humidity, etc.…”

Section: Introductionmentioning

confidence: 99%

A Review of Cracking Behavior and Mechanism in Clayey Soils Related to Desiccation

Wei

Gao

Liu

2020

Advances in Civil Engineering

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Cracks in clayey soils are common during desiccation. The presence of cracks significantly alters the mechanical and hydraulic properties of soils. The objective of this article is to summarize the works on cracking behavior and mechanism in clayey soils related to desiccation. Historical field investigations, laboratory experimentations, identified mechanisms, and numerical approaches for modeling the process of cracking during desiccation are discussed. The experimental approaches for interpreting the mechanisms of cracking are systematically summarized and comprehensively reviewed based on the in situ observations and laboratory experimentations from the literature. The soil mechanics-based approaches resumed in this article according to the fracture mechanics theory and numerical results highlight the cracking development mechanism. Concerning the plasticity characteristics of clayey soils, researches on soil fracture mechanics should be paid more attention. More in situ experimentations and numerical researches are suggested for future researches to better understand the cracking behavior and mechanism in clayey soils related to desiccation.

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Experimental study on soil-water characteristic curve for silty clay with desiccation cracks

Cited by 57 publications

References 23 publications

Correlation between Spectral Characteristics and Physicochemical Parameters of Soda-Saline Soils in Different States

Correlation between Spectral Characteristics and Physicochemical Parameters of Soda-Saline Soils in Different States

Subpixel precision of crack lip movements by Heaviside‐based digital image correlation for a mixed‐mode fracture

A Review of Cracking Behavior and Mechanism in Clayey Soils Related to Desiccation

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