Engineering Transactions, 49, 4, pp. 599–621, 2001

On the Efficiency of the Soil Digging Processes

J. Maciejewski
Institute of Fundamental Technological Research Polish Academy of Sciences
Poland

A. Jarzębowski
Institute of Fundamental Technological Research Polish Academy of Sciences
Poland

W. Trąmpczyński
Technical University of Kielce
Poland

In the first part of the paper, an experimental verification of correctness of the common assumption that the plane strain conditions occur in the tests performed in soil bins is presented. An experimental program was executed basing on the soil cutting problem, with the application of vertical rigid walls of various widths as the working tools. It turned out that in the case of the tool width equal to the width of the soil bin, the soil cutting problems may be treated as the plane strain processes. The influence of the friction phenomena on the side walls of the bin was estimated. For the tools for which no interaction with the side walls of the bin was observed, the zone of the plane strain deformation occurred in the central part of the tools. Then the characteristic deformation patterns and force-displacement relations for the L-shaped tool are determined. Finally, the new idea of the optimization of digging be means of the earth-working machinery is presented and experimentally verified. Dividing the whole excavation task into several repeatable cycles for which the soil free boundary before and after the experiment are similar, the optimization of the single cycle plays a significant role in the energetic efficiency of the whole task. The single cycle of the working process is defined using several basic parameters. The influence of each parameter on the specific unit energy of the process is experimentally verified. The set of values of the discussed parameters is recommended for the particular soil and tool shape. The disadvantages of other soil cutting strategies are discussed.
Full Text: PDF

References

R. BUTTERFIELD, K.Z. ANDRAWES, An investigation of a plane strain continuous penetration problem, Geotechnique 22, 4, 597–617, 1972.

Y. HATAMURA, K. CHUIIWA, Analysis of the mechanism of soil cutting, Bulletin of the JSME, 18, 120, 1975; 19, 131, 1976; 19, 137, 1976; 20, 139, 1977; 20, 141, 1977.

A. DRESCHER, R L. MICHALOWSKI, Density variation in pseudo–steady plastic flow of granular media, Geotechnique 34, 1, 1–10, 1984.

S. ICHIBA, K. HYODO, Y. OOISHI, A study on the mechanical behavior of soil during flat edge cutting, Mitsubishi Technical Bulletin, No. 176, 1987.

V. SHARMA, G. SINGH, D. GEE-CLOUGH, Soil-tool interaction in sand, Proc. of the 10th International Conference of the ISTVS, Kobe 1990.

Z. MRÓZ, J. MACIEJEWSKI, Post-critical response of soils and shear band evolution, CHAMBON, DERUES, VARDOULAKIS [Eds.], Localisation and Bifurcation Theory for Soils and Rocks, Proceedings of the 3rd International Workshop, Grenoble (Aussois), France, 6–9 September 1993, p. 19–32, Balkema 1994.

A. JARZĘBOWSKI, J. MACIEJEWSKI, D. SZYBA, W. TRĄMPCZYŃSKI, Experimental and theoretical analysis of a cohesive soil shoving process (the optimization of the process), proceedings, 6th European ISTVS Conference, (Wien, Austria) 28–30.09.1994.

A. JARZĘBOWSKI, J. MACIEJEWSKI, D. SZYBA, W. TRĄMPCZYŃSKI, On the energetically most efficient trajectories for heavy machine shoving process, Engineering Transactions, 43, 1–2, 169–182, 1995.

A. JARZĘBOWSKI, J. MACIEJEWSKI, D. SZYBA, W. TRĄMPCZYŃSKI, The optimization of heavy machines tools filling process and tools shapes (modelling test results), Symposium ISARC 1995, Automation and Robotics in Construction XII, E. BUDNY, A. McCREA, K. SZYMAŃSKI [Eds.], ImBiGS 159–166, 1995.

L. PLONECKI, W. TRĄMPCZYŃSKI, W. GIERULSKI, J. CENDROWICZ, K. SOKOLOWSKI, Computer control system for heavy machine fixtures motion and its application for automatic generation of cutting tools trajectories according to the given criteria, Engineering Transactions, 48, 1, 3–24, 2000.

W. HERMAWAN, M. YAMAZAKI, A. OIDA, Theoretical analysis of soil reaction on a lug of the movable lug cage wheel, Journal of Terramechanics 37, 65–86, 2000.




Copyright © 2014 by Institute of Fundamental Technological Research
Polish Academy of Sciences, Warsaw, Poland