Summary
This paper presents results when using a tensiometer designed in the Soil Mechanics Laboratory at COPPE/UFRJ, and several other instruments. This new instrument measures suction values up to 1500 kPa. In more typical tensiometers, the cavitation of the system hinders the measurement of suction with values over 100 kPa. Ridley and Burland (1993) designed a new model of tensiometer to measure suction of more than 100 kPa. Mahler et al. (2002) presented a new tensiometer with which suction values up to 350 kPa were measured. This paper introduces an updated model of a tensiometer, using a variation of the equipment proposed by Mahler et al. (2002). The updated model worked extremely well and cost little to build. The equipment used allows suction to be measured relatively quickly and, as previously stated, is economical to produce (about US$300). To date, the range of suction levels that can be measured reaches 1500 kPa with no difficulty. The tests were carried out in two boxes of 160× 50× 60 cm under laboratory conditions. The equipment used included a 15 m.c.a. ceramic block pressure sensor, de-aerated water and a special acrylic tube specifically designed for this instrument. The results were compared to two simple automated tensiometers and equivalent tensiometers. In general very good results were obtained. The main final remarks so far are as follows:
• the high bubble air entry of the ceramic block inhibits the presence of air bubbles, but the response time is slower for suction values of more than 200 kPa;
• the saturation process used for the ceramic stone worked very well;
• as expected, the position of the equivalence tensiometer influences the value measured;
• the mini-lysimeter system proved to be a very good alternative for laboratory tests and for the development of instruments that measure suction;
• the new instrument presented herein proved to be a good and an economical alternative for measuring matrix suction in the soil.
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References
Diene AA (2004) Tensiometers development for high suction measurement in laboratory lysimeters. MSc Thesis, Coppe-UFRJ, 173 pp (in Portuguese)
Entran® Pressure Sensors (2000) EPX Miniature Threaded Pressure Sensors, www.entran.com
Guan Y, Fredlund DG (1997) Direct measurement of high soil suction. In: Simpóosio solos não saturados brasileiro, 3, Rio de Janeiro, 2:543–550
Harvey EN, Barnes DK, McElroy WD, Whiteley AH, Pease DC, Cooper KW (1944) Bubble formation in animals. I. Physical factors, J Cell Comp Physiol 24(1):1–22.
König D, Jessberger HL, Bolton MD, Phillips R, Bagge G, Renzi R, Garnier J (1994) Pore pressure measurement during centrifuge model test: experience of five laboratories. In: Leung, Lee, Tan (eds) Centrifuge’94. Balkema, Rotterdam:101–108
Mahler CF, Pacheco AC, Souza HG (2002) Development of an automatic tensiometer in laboratory using a Mini-Lysimeter. In: 3rd Int Conf on Unsaturated Soils, REcife, Brazil
Marinho FAM, Chandler RJ (1995) Cavitation and the Direct Measurement of Soil Suction. In: First Int Conf on Unsaturated Soils, Paris, France 2:623–630
Pacheco AC (2001) Development of a new tensiometer to measure suctions higher than one Atm. MSc Thesis, Coppe-UFRJ 93 pp (in Portuguese)
Ridley AM (1993) The measurement of soil moisture suction. PhD Thesis, University of London, Civil Eng Dept
Ridley AM (1995) Strength–suction–moisture content relationship for kaolin under normal atmospheric conditions. In: First Int Conf on Unsaturated Soils Unsat’95, Paris 2:645–651
Ridley AM, Burland JB (1993) A new instrument for measuring soil moisture suction. In: Technical Note, Geotechnique 43(2):321–324
Ridley AM, Burland JB (1995) Mesasurement of suction in materials which swell, Appl Mech Rev 48(10):727–732
Tabor D (1979) Gases, liquids and solids, 2nd ed. Cambridge University Press
Take WA, Bolton MD (2002) A Negative Devices for the Measurements of Negative Pore Water Pressure in Centrifuge Models, Physical Modeling On Geotecnics: 89–94
Tarantino A, Bosco G, Mongiovi L (2000) Response of the IC Tensiometer With Respect to Cavitation. Unsaturated Soils for Asia:309–313
Tarantino A, Mongiovi L (2002) Design and Construction of a Tensiometer for Direct Measurement of Matric Suction. Unsaturated Soils:319–334
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Mahler, C.F., Diene, A.A. (2007). Tensiometer Development for High Suction Analysis in Laboratory Lysimeters. In: Schanz, T. (eds) Experimental Unsaturated Soil Mechanics. Springer Proceedings in Physics, vol 112. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-69873-6_10
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DOI: https://doi.org/10.1007/3-540-69873-6_10
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