Designing of transducer for determination of stress state in soil

Document Type : Research article

Authors

1 Senior Expert, Research Institute of Forests and Rangelands

2 Member of Scientific board, University of Tehran

Abstract

It is a fact that excessive traffic of machines on natural sources and agricultural fields increases soil compaction. The study of soil compaction requires determination of the stress state of soil. A transducer was designed to measure normal pressure in six predetermined directions. The pressure transducer composed of six sensing units and a core. The Data Acquisition System used in this research consists of a data logger, a printer and a recorder. The data collected were used to determine shear stresses which in turn can be utilized for calculation of soil stress state. The change in soil density due to the excessive traffic can be calculated by these data.
 

Keywords


- شاکری، م. و نخعی، غ.، 1372. مقاومت مصالح پیشرفته و تحلیل تجربی تنش. دانشگاه صنعتی امیر کبیر، تهران، 541 صفحه.
- Alimardani, R., 1987. A Computer Base Instrumentation System For Measuring Tractor Field Performance. Ph.D. Dissertation, Iowa State University, 134 p.
- Cooper, A. W., Vanden Berg, G.E., Mc colly, H.F. and Erickson, A.E., 1957. Strain Gauge Cell Measures Soil Pressure. Agricultural Engineering: 232-235, 246.
- Harris, W. L., Buchele, W.F. and Malvern, L.E., 1964. Relationship of Mean Stress, Volumetric Strain and Dynamic Loads in soil. Transactions of the ASAE, 7(4): 362 - 363, 369.
- Hovansion, J. D. and Buchele, W.F., 1959. Development of a Recording Volumetric Transducer for Studying Effects of Soil Parameters on Compaction. Transactions of the ASAE: 78-81.
- Nichols, T. A., Bailey, A.C., Johnson, C.E. and Grisso, R.D., 1984. A Stress State Transducer For Soil. ASAE Paper No. 84-1592.
- Mckyes, E., 1985. Soil cutting and tillage. Elsevier, Amsterdam, 217p.
- Nichols, T. A., Bailey, A.C. and Johnson, C.E., 1985. Soil Stress State Determination Under Wheel Loads. ASAE Paper No. 45-1553.
- Raper, R., 1987. Prediction of Soil Compaction Using The Finite Element Method. Ph.D. Dissertation, Iowa state university, 244 p.
- Vanden Berg, G. E., Buchele, W.F. and Malvern, L.E., 1958. Application of Continuum Mechanics to Soil Compaction. Transactions of ASAE, 1(1): 24-27.
- Verma, B. P., Bailey, A.C., Schafer, R.L. and Futral, J.G., 1976. A Pressure Transducer in Soil Compaction study. Transactions of the ASAE, 19(3): 442-447.