Soil Water Retention Curves for Residual Soils Using Traditional Methods and MIP
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ORIGINAL PAPER
Soil Water Retention Curves for Residual Soils Using Traditional Methods and MIP Rodolfo Moreda Mendes . Fernando Antoˆnio Medeiros Marinho
Received: 18 May 2016 / Accepted: 11 May 2020 Ó Springer Nature Switzerland AG 2020
Abstract This paper presents the pore size distribution and the soil water retention curves (SWRC) for an undisturbed residual soil obtained using traditional methods and using mercury intrusion porosimeter (MIP). The specimens were obtained from two residual soil profiles of the Serra do Mar, SP, Brazil. The results obtained allowed the evaluation of the pore size distribution along the soil profile and its relation to the water retention characteristics of the soil profile. The SWRC obtained using traditional methods, such as suction plate, pressure plate and filter paper method, is compared with the soil water retention curve inferred from the MIP. The results indicated that the amount of meso and macropores tends to increase with depth, while the amount of micropores tends to decrease. The comparison between the SWRC obtained using the MIP technique and the traditional procedures suggested that the former overestimates the water retention capacity for lower suctions.
R. M. Mendes (&) National Centre for Monitoring and Early Warning of Natural Disasters-CEMADEN/MCTI, Estrada Doutor Altino Bondesan, 500, Parque Tecnolo´gico, Sa˜o Jose´ dos Campos, SP 12247-016, Brazil e-mail: [email protected] F. A. M. Marinho University of Sa˜o Paulo, Avenida Professor Almeida Prado, 83, Pre´dio da Engenharia Civil-PEF, Butanta˜, Sa˜o Paulo, SP 05508-900, Brazil e-mail: [email protected]
Keywords Soil–water retention curve Porosimeter Hydraulic conductivity Residual soils
1 Introduction The knowledgement of the spatial variability of physical and hydraulic properties of soils is an important tool for better understanding the dynamics of water flow in different soil profiles. It can be directly applied in various areas such as, agriculture, geotechnical engineering, among others (e.g. Cooper et al. 2013; Rahardjo et al. 2004; Aung et al. 2001; Otto and Alcaide 2001). Among the soil properties, those obtained through the soil water retention curve (SWRC) are extremely important in any studies involving unsaturated soils (e.g. Moraes et al. 1993; Fredlund and Rahardjo 1993). The SWRC expressing the relationship between the amount of water held in the soil and the soil suction can express aspects associated with the nature and the state of the soil. In general, terms the MIP allows the determination of pore sizes and its percentage in relation to the volume of voids within the specimens. The use of mercury intrusion porosimetry (MIP) test for undisturbed soil specimens is an interesting tool to study the microstructure of soils. Considering the theory behind the MIP technique, it is possible to infer the SWRC using the MIP results. The results of MIP can be analysed in terms of injected volume as a function of
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