scholarly journals Calibration of a thermal conductivity sensor for field measurement of matric suction

Géotechnique ◽  
2012 ◽  
Vol 62 (1) ◽  
pp. 81-85 ◽  
Author(s):  
E.C. LEONG ◽  
X.-H. ZHANG ◽  
H. RAHARDJO
Keyword(s):  
Thermal Conductivity ◽  
Field Measurement ◽  
Matric Suction ◽  
Conductivity Sensor

Use of thermal conductivity sensors to measure matric suction in the laboratory

1989 ◽  
Vol 26 (3) ◽  
pp. 491-498 ◽  
Author(s):  
Pamela Sattler ◽  
D. G. Fredlund
Keyword(s):  
Thermal Conductivity ◽  
Unsaturated Soils ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Test Procedure ◽  
Matric Suction ◽  
Engineering Practice ◽  
Equilibration Time ◽  
Overburden Pressure ◽  
Conductivity Sensor

The measurement of soil suction is pivotal to the application of soil mechanics principles in geotechnical engineering practice related to unsaturated soils. Volume change, shear strength, and seepage analyses all require an understanding of the matric suction in the soil. This note summarizes the use of thermal conductivity sensors to measure matric suction in the laboratory. The thermal conductivity sensor is described along with its mode of operation. A brief description is given of the procedure for calibrating thermal conductivity sensors using a pressure plate apparatus. The measurement of matric suction can be performed in the laboratory on Shelby tube samples. The laboratory measurements of matric suction can be adjusted for the effect of overburden pressure in the field. The required equilibration time for suction measurements is discussed along with details of the test procedure. The applications of the measured suction values to design are briefly discussed.Key words: matric suction, negative pore-water pressure, thermal conductivity sensor, laboratory, undisturbed samples.

Long-term measurement of matric suction using thermal conductivity sensors

2003 ◽  
Vol 40 (3) ◽  
pp. 587-597 ◽  
Author(s):  
Craig Nichol ◽  
Leslie Smith ◽  
Roger Beckie
Keyword(s):  
Thermal Conductivity ◽  
Ambient Temperature ◽  
Water Movement ◽  
Mine Waste ◽  
Matric Suction ◽  
Waste Rock ◽  
Sensor Data ◽  
Wetting Front ◽  
Conductivity Sensor

Thermal conductivity (TC) sensors, which provide estimates of matric suction, were used in a field experiment designed to characterize unsaturated water movement through coarse mine waste rock at a mine site in northern Saskatchewan. Two years of monitoring data were used to evaluate long-term TC sensor performance and accuracy. Thermal conductivity sensor output requires corrections of sensor hysteresis and changes in ambient temperature. A correction method for ambient temperature is derived. A comparison of the uncorrected field measurements with the values corrected for both hysteresis and ambient temperature indicates that the magnitude of these corrections can be similar. Corrected TC sensor measurements are compared to measurements of matric suction made using tensiometers. Thermal conductivity sensor response to the initial arrival of a wetting front lagged 1–3 days behind the tensiometer measurements. The TC sensor data tended to overestimate matric suction in the waste rock, when compared to the tensiometer data. Long-term drift in the TC sensors located at depths of 50 cm and below (where the sensors have been continuously exposed to matric suctions less than 20 kPa) has lead to data that are not interpretable using the calibration curves derived prior to sensor emplacement in the waste rock pile.Key words: matric suction, thermal conductivity sensor, hysteresis, temperature.

scholarly journals Research on a Fast-Response Thermal Conductivity Sensor Based on Carbon Nanotube Modification

Sensors ◽  
2018 ◽  
Vol 18 (7) ◽  
pp. 2191
Author(s):  
Hongquan Zhang ◽  
Bin Shen ◽  
Wenbin Hu ◽  
Xinlei Liu
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotube ◽  
Fast Response ◽  
Conductivity Sensor

Investigating time-resolved response of micro thermal conductivity sensor under various modes of operation

2018 ◽  
Vol 254 ◽  
pp. 771-777 ◽  
Author(s):  
Daniel Struk ◽  
Amol Shirke ◽  
Alireza Mahdavifar ◽  
Peter J. Hesketh ◽  
Joseph R. Stetter
Keyword(s):  
Thermal Conductivity ◽  
Modes Of Operation ◽  
Time Resolved ◽  
Conductivity Sensor

Dynamic thermal conductivity sensor for gas detection

2004 ◽  
Vol 98 (1) ◽  
pp. 63-68 ◽  
Author(s):  
Pascal Tardy ◽  
Jean-René Coulon ◽  
Claude Lucat ◽  
Francis Menil
Keyword(s):  
Thermal Conductivity ◽  
Gas Detection ◽  
Conductivity Sensor

Performance of Fredlund thermal conductivity sensor

2004 ◽  
pp. 125-133 ◽  
Author(s):  
D Fredlund ◽  
Y Perera ◽  
J Padilla
Keyword(s):  
Thermal Conductivity ◽  
Conductivity Sensor

Use of a new thermal conductivity sensor for laboratory suction measurement

2020 ◽  
pp. 275-280
Author(s):  
D.G. Fredlund ◽  
F. Shuai ◽  
M. Feng
Keyword(s):  
Thermal Conductivity ◽  
Conductivity Sensor

A generalized relationship between thermal conductivity and matric suction of soils

Geoderma ◽  
2019 ◽  
Vol 337 ◽  
pp. 491-497 ◽  
Author(s):  
Sen Lu ◽  
Yili Lu ◽  
Wei Peng ◽  
Zhaoqiang Ju ◽  
Tusheng Ren
Keyword(s):  
Thermal Conductivity ◽  
Matric Suction
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