Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Model test on the dynamic characteristics of crack formation in expansive soil slopes under alternate drying and wetting
https://orcid.org/http://orcid.org/0000-0002-8650-2890
To explore the dynamic characteristics of crack formation in expansive soils slope, this paper conducted an indoor model test of the expansive soils slope with seven times of alternate drying and wetting. The 3D laser scanning and image processing techniques were adopted to extract the geometric features of crack development with the moisture absorption and desorption, and the real-time water content and matrix suction were monitored to investigate the dynamic crack formation mechanism of the expansive soil slope during the alternate drying and wetting. The results showed that (1) the crack formation in expansive soil slopes was closely related to the times of the alternate drying and wetting. Due to the moisture desorption, the slope surface was divided into several large blocks by the main cracks at the early stage, and the mechanical property of these blocks gradually degraded under the continued drying and wetting. As a result, the slope surface was further divided into more blocks by the Y-shaped, T-shaped, and arcuate cracks; (2) the crack rate, crack length, crack density, and crack network connectivity in expansive soil slopes all showed the trend of growth, stabilization, and continued growth, indicating apparent damage accumulation with the alternate drying and wetting; (3) the formation of primary cracks in expansive soil slopes was highly repetitive, while the location and orientation of secondary cracks varied with the alternation of drying and wetting, which intensified the anisotropy of the crack network; (4) the network cracks of expansive soil under the action of wet and dry cycles form a natural interception channel for rainfall runoff. Because of the swelling deformation induced by the moisture absorption and the fine particles transportation during the rain wash, the cracks will be closed to a certain extent. However, there would be existing lots of the residual cracks with the accumulated soil structure damage under the alternate drying and wetting. Thus, the surface soil gradually softened with the rainwater infiltration, and new cracks formed from the ends of the concentrated stress zone to deeper soil bodies and interconnected, all these accelerated the destabilization of the expansive soils slope.
Model test on the dynamic characteristics of crack formation in expansive soil slopes under alternate drying and wetting
https://orcid.org/http://orcid.org/0000-0002-8650-2890
To explore the dynamic characteristics of crack formation in expansive soils slope, this paper conducted an indoor model test of the expansive soils slope with seven times of alternate drying and wetting. The 3D laser scanning and image processing techniques were adopted to extract the geometric features of crack development with the moisture absorption and desorption, and the real-time water content and matrix suction were monitored to investigate the dynamic crack formation mechanism of the expansive soil slope during the alternate drying and wetting. The results showed that (1) the crack formation in expansive soil slopes was closely related to the times of the alternate drying and wetting. Due to the moisture desorption, the slope surface was divided into several large blocks by the main cracks at the early stage, and the mechanical property of these blocks gradually degraded under the continued drying and wetting. As a result, the slope surface was further divided into more blocks by the Y-shaped, T-shaped, and arcuate cracks; (2) the crack rate, crack length, crack density, and crack network connectivity in expansive soil slopes all showed the trend of growth, stabilization, and continued growth, indicating apparent damage accumulation with the alternate drying and wetting; (3) the formation of primary cracks in expansive soil slopes was highly repetitive, while the location and orientation of secondary cracks varied with the alternation of drying and wetting, which intensified the anisotropy of the crack network; (4) the network cracks of expansive soil under the action of wet and dry cycles form a natural interception channel for rainfall runoff. Because of the swelling deformation induced by the moisture absorption and the fine particles transportation during the rain wash, the cracks will be closed to a certain extent. However, there would be existing lots of the residual cracks with the accumulated soil structure damage under the alternate drying and wetting. Thus, the surface soil gradually softened with the rainwater infiltration, and new cracks formed from the ends of the concentrated stress zone to deeper soil bodies and interconnected, all these accelerated the destabilization of the expansive soils slope.
Model test on the dynamic characteristics of crack formation in expansive soil slopes under alternate drying and wetting
https://orcid.org/http://orcid.org/0000-0002-8650-2890
To explore the dynamic characteristics of crack formation in expansive soils slope, this paper conducted an indoor model test of the expansive soils slope with seven times of alternate drying and wetting. The 3D laser scanning and image processing techniques were adopted to extract the geometric features of crack development with the moisture absorption and desorption, and the real-time water content and matrix suction were monitored to investigate the dynamic crack formation mechanism of the expansive soil slope during the alternate drying and wetting. The results showed that (1) the crack formation in expansive soil slopes was closely related to the times of the alternate drying and wetting. Due to the moisture desorption, the slope surface was divided into several large blocks by the main cracks at the early stage, and the mechanical property of these blocks gradually degraded under the continued drying and wetting. As a result, the slope surface was further divided into more blocks by the Y-shaped, T-shaped, and arcuate cracks; (2) the crack rate, crack length, crack density, and crack network connectivity in expansive soil slopes all showed the trend of growth, stabilization, and continued growth, indicating apparent damage accumulation with the alternate drying and wetting; (3) the formation of primary cracks in expansive soil slopes was highly repetitive, while the location and orientation of secondary cracks varied with the alternation of drying and wetting, which intensified the anisotropy of the crack network; (4) the network cracks of expansive soil under the action of wet and dry cycles form a natural interception channel for rainfall runoff. Because of the swelling deformation induced by the moisture absorption and the fine particles transportation during the rain wash, the cracks will be closed to a certain extent. However, there would be existing lots of the residual cracks with the accumulated soil structure damage under the alternate drying and wetting. Thus, the surface soil gradually softened with the rainwater infiltration, and new cracks formed from the ends of the concentrated stress zone to deeper soil bodies and interconnected, all these accelerated the destabilization of the expansive soils slope.
Model test on the dynamic characteristics of crack formation in expansive soil slopes under alternate drying and wetting
Acta Geotech.
Zhang, Hongri (Autor:in) / Yang, Jiming (Autor:in) / Wang, Lei (Autor:in) / Xu, Yongfu (Autor:in)
Acta Geotechnica ; 18 ; 2097-2115
01.04.2023
19 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Alternate drying and wetting , Crack formation , Expansive soils slope , Model test , Preferential flow Engineering , Geoengineering, Foundations, Hydraulics , Solid Mechanics , Geotechnical Engineering & Applied Earth Sciences , Soil Science & Conservation , Soft and Granular Matter, Complex Fluids and Microfluidics
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