Numerical analysis of crack generation in saturated deformable soil under row-planted vegetation

Yoshida, Shuichiro; Adachi, Kazuhide

doi:10.1016/j.geoderma.2003.08.009

Cited by 48 publications

(28 citation statements)

References 15 publications

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“…Soil cracks are closely related to changes in soil structure (Velde et al 1999, Bruand et al 2001, infiltration capacity (LIU et al 2003), evaporative loss of soil water (Adams et al 1964), and the preferential migration of soil solutes (Roberto 2002). Soil cracks cause deterioration in soil water quality (Adrian et al 2000) and influence many important physical, chemical, and biochemical processes in soil (Yoshida et al 2004). The study of soil cracks has great significance for understanding the processes of soil degradation and underground water pollution and for the development of re-vegetation techniques (XIONG et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Surface morphology of soil cracks in Yuanmou Dry-hot Valley Region, Southwest China

et al. 2009

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Surface morphology of soil cracks is one of the important factors influencing the water evaporation rate in cracked soil in Yuanmou Dry-hot Valley Region, Southwest China. Quantitative study of the complicated surface morphology of soil cracks is a prerequisite for further studies of soil-cracking mechanisms. The present paper establishes a quantitative indicator system by application of concepts and methods originating from Fractal Geometry and Network Analysis. These indicators can effectively express the complicated features of soilcrack network structure. Furthermore, a series of values related to soil-crack morphology was obtained by image processing on field photos of soil-crack quads, and gradation criteria for the degree of development of soil cracks were determined. Finally, the changes in values of the morphological indicators under different degrees of development were analyzed in detail. Our results indicate that (1) the degree of development of soil cracks can be divided into five grades, i.e., feeble development, slight development, medium development, intensive development and extremely intensive development; (2) the values of the indicators change predictably with increasing degree of development of soil cracks. The area density (Dc) increases, and both the area-weighted mean ratio of crack area to perimeter (AWMARP), which reflects the intensity of cracking, and the index r, which is related to the connectivity of a soil crack, grow uniformly (albeit with different forms). AWMRAP increases at a geometric rate while r shows logarithmmic growth, indicating a gradual increase in the connectivity of a soil crack. Nevertheless, the areaweighted mean of soil-crack fractal dimension (AWMFRAC) shows a decreasing trend, indicating a gradual decline in the complexity of cracks as area density increases.

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Section: Introductionmentioning

confidence: 99%

Surface morphology of soil cracks in Yuanmou Dry-hot Valley Region, Southwest China

et al. 2009

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“…Crack area density ( c D ) is one of the most visual, precise indicators in expressing crack morphology, and has been applied by several researchers [8] for several times before. Taking c D as reference, this paper selects further indicators to express crack intensity, morphological complexity and connectivity.…”

Section: Factor Analysismentioning

confidence: 99%

“…Due to the close relationship of soil cracks with the changes of soil structure [2,3] , infiltration capacity [4] , evaporation loss of soil water [5] , and the preferential migration of soil solutes [6] , resulting in deterioration of soil water quality [7] and even influencing many important soil properties and physical, chemical, and biochemical processes [8] , the study on soil crack has great significance to the process study of soil degradation, underground water pollution and to revegetation work [9] . However, the related studies are still superficial recently.…”

Section: Introductionmentioning

confidence: 99%

Selection of judging indicators for surface morphology of soil crack under different development degrees in Yuanmou arid-hot valley region

Xiong

Lü

Xian

et al. 2008

Wuhan Univ. J. Nat. Sci.

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Quantification of complicated surface morphology of soil crack is a prerequisite and key to soil crack study. This paper takes soil crack quads in Yuanmou arid-hot valley region as examples, selecting several morphological indicators, and analyzes the soil crack's morphological features under various development degrees. By statistic analysis, three quantitative indicators for surface morphology are selected, namely soil crack area density, area weighted mean fractal dimension and connectivity index R, which can not only express the development intensity of soil cracks, but also effectively describe its morphological complexity and connectivity. The research results set a good base for the establishment of soil crack assessment system in Yuanmou arid-hot valley region.

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“…Yin et al [2,3] analyzed the affecting factors of crack formation and discussed quantitative methods of cracks, thinking that the generation and development of crack was a key factor for expansive soil slope damage. Starting from morphology, Tang et al [4][5][6], analyzed the crack development law and predicted the location where crack may be formed. Zhang et al [7][8][9], analyzed the crack evolution laws, and results showed that the key factor that affected cracking depth and stretch degree was not the soil moisture, but its change rate.…”

Section: Introductionmentioning

confidence: 99%

Expansive Soil Crack Depth under Cumulative Damage

Shi¹,

Chen²,

Zheng³

2014

Soil Behavior and Geomechanics

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The crack developing depth is a key problem to slope stability of the expansive soil and its project governance and the crack appears under the roles of dry-wet cycle and gradually develops. It is believed from the analysis that, because of its own cohesion, the expansive soil will have a certain amount of deformation under pulling stress but without cracks. The soil body will crack only when the deformation exceeds the ultimate tensile strain that causes cracks. And it is also believed that, due to the combined effect of various environmental factors, particularly changes of the internal water content, the inherent basic physical properties of expansive soil are weakened, and irreversible cumulative damages are eventually formed, resulting in the development of expansive soil cracks in depth. Starting from the perspective of volumetric strain that is caused by water loss, considering the influences of water loss rate and dry-wet cycle on crack developing depth, the crack developing depth calculation model which considers the water loss rate and the cumulative damages is established. Both the proposal of water loss rate and the application of cumulative damage theory to the expansive soil crack development problems try to avoid difficulties in matrix suction measurement, which will surely play a good role in promoting and improving the research of unsaturated expansive soil.

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Numerical analysis of crack generation in saturated deformable soil under row-planted vegetation

Cited by 48 publications

References 15 publications

Surface morphology of soil cracks in Yuanmou Dry-hot Valley Region, Southwest China

Surface morphology of soil cracks in Yuanmou Dry-hot Valley Region, Southwest China

Selection of judging indicators for surface morphology of soil crack under different development degrees in Yuanmou arid-hot valley region

Expansive Soil Crack Depth under Cumulative Damage

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