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THE DEVELOPMENT OF AN IMPROVED TENSIOMETER FOR THE MEASUREMENT OF SOIL SUCTION

Andrew M. Ridley, K C Brady

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Abstract

The report provides an introduction to the subject of soil suction and describes situations where suctions affect the behaviour of geotechnical structures. Direct and indirect methods commonly used to measure suction are reviewed, and the development of a new tensiometer that can measure soil suctions directly over a wide range of conditions is described. A method of installing the tensiometer at the bottom of a borehole is described and in situ measurements of suction are presented. The development of this instrument will allow the behaviour of unsaturated soils to be investigated more conveniently and in more detail than hitherto: the implications of this in terms of economy and safety in design are far reaching. (A)

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What this paper is about

The report provides an introduction to the subject of soil suction and describes situations where suctions affect the behaviour of geotechnical structures. Direct and indirect methods commonly used to measure suction are reviewed, and the development of a new tensiometer that can measure soil suctions directly over a wide range of conditions is described. A method of installing the tensiometer at the bottom of a borehole is described and in situ measurements of suction are presented. The development of this instrument will allow the behaviour of unsaturated soils to be investigated more conveniently and in more detail than hitherto: the implications of this in terms of economy and safety in design are far reaching. (A)

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Available abstract

The report provides an introduction to the subject of soil suction and describes situations where suctions affect the behaviour of geotechnical structures. Direct and indirect methods commonly used to measure suction are reviewed, and the development of a new tensiometer that can measure soil suctions directly over a wide range of conditions is described. A method of installing the tensiometer at the bottom of a borehole is described and in situ measurements of suction are presented. The development of this instrument will allow the behaviour of unsaturated soils to be investigated more conveniently and in more detail than hitherto: the implications of this in terms of economy and safety in design are far reaching. (A)

Key concepts: Tensiometer (surface tension), Suction, Geotechnical engineering, Soil water, Borehole, Geology, Engineering, Environmental science

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