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COMPARISON OF ESTIMATION METHODS OF SOIL STRENGTH IN FIVE SOILS

期刊

REVISTA BRASILEIRA DE CIENCIA DO SOLO
卷 33, 期 3, 页码 487-495

出版社

SOC BRASILEIRA DE CIENCIA DO SOLO
DOI: 10.1590/S0100-06832009000300002

关键词

Penetration resistance; preconsolidation pressure; load support capacity

资金

  1. Third World Academy of Science (TWAS)
  2. Conselho Nacional de Desenvolvimento Cient fico e Tecnologico (CNPq)

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In agriculture, the soil strength is used to describe the susceptibility to deformation by pressure caused by agricultural machine. The purpose of this study was to compare different methods for estimating the inherent soil strength and to identify their suitability for the evaluation of load support capacity, compaction susceptibility and root growth. The physical, chemical, mineralogical and intrinsic strength properties of seven soil samples, collected from five sampling pits at different locations in Brazil, were measured. Four clay (CS) and three sandy clay loam (SCL) soils were used. The clay soils were collected on a farm in Santo Angelo, RS (28 degrees 16 ' 16 '' S; 54 degrees 13 ' 11 '' W 290 m); A and B horizons at the Universidade Federal de Lavras, Lavras, MG (21 degrees 13 ' 47 '' S; 44 degrees 58 ' 6 '' W; 918 m) and on the farm Sygenta, in Uberlandia, MG (18 degrees 58 ' 37 '' S; 48 degrees 12 ' 05 '' W 866 m). The sandy clay loam soils were collected in Aracruz, ES (19 degrees 47 ' 10 '' S; 40 degrees 16 ' 29 '' W 81 m), and on the farm Xavier, Lavras, MG (21 degrees 13 ' 24 '' S; 45 degrees 05 ' 00 '' W; 844 m). Soil strength was estimated based on measurements of: (a) a pneumatic consolidometer, (b) manual pocket (non-rotating) penetrometer; and (c) automatic (rotating) penetrometer. The results of soil strength properties were similar by the three methods. The soil structure had a significant influence on soil strength. Results of measurements with both the manual pocket and the electric penetrometer were similar, emphasizing the influence of soil texture. The data showed that, to enhance the reliability of predictions of preconsolidation pressure by penetrometers, it is better to separate the soils into the different classes, rather than analyze them jointly. It can be concluded that the consolidometer method, although expensive, is the best when evaluations of load support capacity and compaction susceptibility of soil samples are desired.

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