干旱区生态环境知识资源中心(Arid): Analysis of changes in volume and propagation of cracks in expansive soil due to changes in water content

Arid

DOI	10.36783/18069657rbcs20190169
	Analysis of changes in volume and propagation of cracks in expansive soil due to changes in water content
	de Melo Ferreira, Silvio Romero; Dantas de Araujo, Arthur Gomes; Silva Barbosa, Felipe Araujo; Rodrigues Silva, Thalita Cristina; de Lima Bezerra, Izabela Medeiros
通讯作者	Ferreira, SRD (corresponding author), Univ Fed Pernambuco, Dept Engn Civil & Ambiental, Programa Posgrad Engn Civil, Recife, PE, Brazil.
来源期刊	REVISTA BRASILEIRA DE CIENCIA DO SOLO
ISSN	0100-0683
出版年	2020
卷号	44
英文摘要	Expansive clay soils are a problem for agriculture and engineering because they are susceptible to change in volume due to seasonal variation in water content and temperature. One of its morphological properties is slickensides, which result from the ability to contract and crack when dry and expand by wetting. The objective of this study was to evaluate the processes of expansion and formation and propagation of cracks due to the change in water content over time. The expansion process was evaluated through simple edometric tests with different external stress values applied to undisturbed soil samples. To evaluate the shrinking process, a device was developed to monitor the process of crack propagation. The mechanisms through which cracks begin and develop were studied using molded soil samples at the liquidity limit and at 1.25 times the liquidity limit with a drying and wetting cycle. Crack initiation conditions and development of geometric crack indices were measured with the water content and drying time. The soil presented medium to high expansion that depends on the overburden and suction applied, and the swelling stress was found to increase as suction increases. The changes in volume due to wetting and the propagation of cracks due to drying developed in three stages: initial, primary, and secondary. In the initial stage, few cracks or swelling occur with gradual variation in water content. As the water content approaches the limit of soil contraction (in the drying process) or the limit of soil saturation (in the wetting process), cracks and expansion developed slowly and approach a secondary stage. In the primary stage, cracks and expansion occurred rapidly with drying or wetting, respectively. Drying and wetting cycles showed similar crack patterns with the appearance of new micro-cracks during each new drying cycle.
英文关键词	cracking unsaturated soils desertification soil conservation soil mechanics
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000600356200001
WOS关键词	DESICCATION CRACKING ; BEHAVIOR ; NETWORK ; YIELD
WOS类目	Soil Science
WOS研究方向	Agriculture
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/349167
作者单位	[de Melo Ferreira, Silvio Romero; Dantas de Araujo, Arthur Gomes; Silva Barbosa, Felipe Araujo; Rodrigues Silva, Thalita Cristina; de Lima Bezerra, Izabela Medeiros] Univ Fed Pernambuco, Dept Engn Civil & Ambiental, Programa Posgrad Engn Civil, Recife, PE, Brazil; [Dantas de Araujo, Arthur Gomes] Univ Fed Rural Semi Arido, Dept Engenharias, Angicos, RN, Brazil
推荐引用方式 GB/T 7714	de Melo Ferreira, Silvio Romero,Dantas de Araujo, Arthur Gomes,Silva Barbosa, Felipe Araujo,et al. Analysis of changes in volume and propagation of cracks in expansive soil due to changes in water content[J],2020,44.
APA	de Melo Ferreira, Silvio Romero,Dantas de Araujo, Arthur Gomes,Silva Barbosa, Felipe Araujo,Rodrigues Silva, Thalita Cristina,&de Lima Bezerra, Izabela Medeiros.(2020).Analysis of changes in volume and propagation of cracks in expansive soil due to changes in water content.REVISTA BRASILEIRA DE CIENCIA DO SOLO,44.
MLA	de Melo Ferreira, Silvio Romero,et al."Analysis of changes in volume and propagation of cracks in expansive soil due to changes in water content".REVISTA BRASILEIRA DE CIENCIA DO SOLO 44(2020).