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Effects of thermo-osmosis on hydraulic behaviour of saturated clays

Zagorscak, Renato, Sedighi, Majid and Thomas, Hywel Rhys 2017. Effects of thermo-osmosis on hydraulic behaviour of saturated clays. International Journal of Geomechanics 17 (3) , 04016068. 10.1061/(ASCE)GM.1943-5622.0000742

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Abstract

Despite a body of research carried out on thermally coupled processes in soils, understanding of thermo-osmosis phenomenon in clays and its effects on hydromechanical behavior is incomplete. This paper presents an investigation on the effects of thermo-osmosis on hydraulic behavior of saturated clays. A theoretical formulation for hydraulic behavior was developed, incorporating an explicit description of thermo-osmosis effects on coupled hydromechanical behavior. The extended formulation was implemented within a coupled numerical model for thermal, hydraulic, chemical, and mechanical behavior of soils. The model was tested and applied to simulate a soil heating experiment. It is shown that the inclusion of thermo-osmosis in the coupled thermohydraulic simulation of the case study provides a better agreement with the experimental data compared with the case in which only thermal expansion of the soil constituents was considered. A series of numerical simulations are also presented, studying the pore-water pressure development in saturated clay induced by a heating source. It is shown that pore-water pressure evolution can be considerably affected by thermo-osmosis. Under the conditions of the problem considered, it was found that thermo-osmosis changed the pore-water pressure regime in the vicinity of the heater when the value of thermo-osmotic conductivity was larger than 10−12 m2·K−1·s−1. New insights into the hydraulic response of the ground and the pore-pressure evolution due to thermo-osmosis are provided in this paper.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Uncontrolled Keywords: Thermo-osmosis; Saturated clay; Hydraulic behavior; Coupled modeling; Hydromechanical.
Publisher: American Society of Civil Engineers
ISSN: 1532-3641
Date of First Compliant Deposit: 11 July 2016
Date of Acceptance: 27 May 2016
Last Modified: 25 Mar 2019 01:52
URI: http://orca.cf.ac.uk/id/eprint/92288

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