» عنوان : Laboratory and Field Testing of Unsaturated Soils
تعداد صفحات : ۲۱۴
The scope of this special issue focuses on recent advances in laboratory and field testing of unsaturated Soils .
Leading researchers from fourteen countries torepresent global research in the area of experimental unsaturated soil mechanics have been invited to contribute to this issue.
Twelve reports are present eddealing with measurement and control of suction andwater content, mechanical,
hydraulic, and geo environmental testing, microstructure investigation, and applications of unsaturated soil monitoring to engineering behaviour of geostructures.
The main motivation behind this issue is the rapid growth of experimental unsaturated soil mechanics over the last couple of decades. Several innovativel aboratory and field techniques have been introduced in mechanical, hydraulic, and geoenvironmental testing.
However,this in formation is widely
dispersed in journals and conference proceeding sand researchers and engineers beginning to work in the field of unsaturated soil mechanics
may find it difficult to identify suitable equipment and instrumentation for research or professional purposes.
This volume aims at providing scientists and practitioners with a comprehensive overview of experimental techniques in unsaturated soil mechanics.
The first group of papers focuses on measure mentand control of matric and total suction.
MARINHO, TAKE & TARANTINO report on the highcapacity tensiometer and the axis translation technique, which share the measurement of a pressure differential across a high air entry porous ceramic.
The paper examines the underlying physical concepts of capillarity, water surface tension and phase change and discusses challenges to be faced in both experimental techniques.
BULUT & LEONG present working principles,calibration, procedures, and application areas of indirect methods of suction measurement.
These include the rmocouple, transistor, and chilled-mirror psychrometer (primary methods), filter paper (secondary methods), and thermal and electrical conductivity sensors (tertiary methods).
Capabilities, limitations,and pitfalls of these methods are discussed.
VANAPALLI, NICOTERA & SHARMA focus onnegative water column and axis translation techniques for matric suction control.
They discuss in detail the limitations of these techniques with respect to air diffusion, water volume change and evaporation.