Influence of compressive tensions on the precompaction pressure and on the compression index of the soil

Revista Brasileira de Engenharia Agrícola e Ambiental

Macedo, Vera R. M.²  Cabeda, Mário S. V.¹  Silva, Apolino J. N. da³ 

[1] UFRGS, Porto Alegre;Instituto Rio-Grandense do Arroz, Cachoeirinha;UFRN, Macaíba

关键词: compressibility parameters;    total porosity;    bulk density    INTRODUÇÃO O processo de degradação física de solos intensamente preparados no sul do Brasil se manifesta pela perda da qualidade da estrutura;    com o aparecimento de finas crostas superficiais e camadas compactadas situadas entre 10 e 30 cm de profundidade (Cabeda;    1984);   

DOI  :  10.1590/S1415-43662010000800010

学科分类：农业科学（综合）

来源: Universidade Federal de Campina Grande * Centro de Ciencias e Tecnologia

【 摘 要 】

The objectives of this study were to determine the compressibility parameters of an Acrisol through uniaxial compression tests, with three application times of compressive pressure (7.5 s, 1 and 2 min) and in two moisture contents (0.113 and 0.164 kg kg-1), and to verify the mechanical soil behavior after the removal of the loads. The Acrisol was collected in an experiment conducted in areas physically degraded and upgraded, in the Agricultural Experimental Station of the UFRGS. The physically degraded condition presented the highest values of precompaction pressure in relation to the upgraded condition, for both moisture contents. There was no significant difference among the values of precompaction pressure determined with the soil compression curve for the times of 7.5 s, 1 and 2 min compressive pressure application in both moisture contents as well in both physical conditions of the soil. The physically upgraded condition presented higher compression index compared to the degraded condition in both moisture contents. The relief promoted by the removal of the compressive pressures imposed on the soil promoted a small increment in the total porosity and reduction in the bulk density.

【 授权许可】

CC BY-NC