Zusammenhang zwischen hydraulischer und mechanischer Bodenstabilität in Abhängigkeit von der Belastungsdauer

Fazekas, Orsolya; Horn, Rainer

doi:10.1002/jpln.200421381

Cited by 37 publications

(20 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Longer loading times were usually found to increase compaction effects, e.g. by Ghezzehei and Or (2001) and Fazekas and Horn (2005). This effect was attributed to the viscoelastic behaviour of the investigated soils, preventing to reach mechanical equilibration over short times.…”

Section: Discussionmentioning

confidence: 81%

Soil and macro-pores under uniaxial compression. II. Morphometric analysis of macro-pore stability in undisturbed and repacked soil

et al. 2008

View full text Add to dashboard Cite

Section: Discussionmentioning

confidence: 81%

Soil and macro-pores under uniaxial compression. II. Morphometric analysis of macro-pore stability in undisturbed and repacked soil

et al. 2008

View full text Add to dashboard Cite

“…However, soil compaction also leads to a shift in pore-space distribution (Becher, 1994;Riggert et al, 2017) whereby positive water pressures can be observed (Fazekas and Horn, 2005). Positive water pressures combined with shearing forces which occur due to the cone-shaped tip of the body of earthworms lead to a completely homogenization of soil aggregates, followed by swelling, and the blockage of smaller lateral side-pores.…”

Section: Introductionmentioning

confidence: 99%

Impact of Small-Scaled Differences in Micro-Aggregation on Physico-Chemical Parameters of Macroscopic Biopore Walls

Haas

Horn

2018

Front. Environ. Sci.

Self Cite

View full text Add to dashboard Cite

Macroscopic biopores, like earthworm burrows or channels which remain after a root decayed, act as preferential flow paths for water, gas, and heat transport processes, and viewing at agricultural production, as preferential elongation paths for plant roots. These processes result in intense alterations of the soil volume and its composition that surrounds the pores. The effects of these processes were analyzed at small-scale and physico-chemical soil parameters, i.e., relative oxygen diffusion coefficient (D s /D O ), oxygen partial pressure pO 2 , Eh and pH of biopore walls, were measured. The analyses were carried out on undisturbed soil samples with different colonization history, excavated from a haplic Luvisol derived from loess. Soil resistance to penetration was determined simultaneously with D s /D O and pO 2 using a coupled, self-developed approach, and four matric potentials (namely, m = −1 kPa; −3 kPa; −6 kPa or −30 kPa) were considered. We hypothesized that physico-chemical soil parameters in biopore walls were altered due to differing influences on the soil aggregation. Aggregation was visualized with scanning electron microscopy, classified and used to explain differences in-soil properties. Plant roots and earthworms altered aggregation next to biopore surfaces in a contrasted way, either by enhancing aggregates diversity or homogenizing it. Roots led to the formation of subpolyeders while earthworms formed subplates. Pore functions of microaggregates were comparable to those of larger scale, and subpolyeders showed much more favorable soil properties in terms of soil aeration (Ds/Do, pO2). Replicates of all parameters scattered intensely and showed deviations up to several orders of magnitude in case of D s /D O underlining the large variability of soil properties in biopore walls.

show abstract

“…Studies carried out by Lebert et al (1989) and Fazekas & Horn (2005) showed differences in the values of the pre-consolidation pressure as well as the compressibility index. According to these authors, there was a reduction of the first and an increase in the values of the second indicator with the increase of the loading time, in static tests using consolidometers.…”

Section: Introductionmentioning

confidence: 93%

Dynamic of Pressure-Deformation Curve in Uniaxial Compression Test in Different Load Times

et al. 2017

View full text Add to dashboard Cite

ABSTRACT:The loading application time by machinery tires and agricultural tires is one of the factors of soil compaction. We evaluated the effect of loading reduction time in uniaxial compression test, in laboratory, in some physical and mechanical parameters, approaching the loading field condition time by machinery with laboratory tests. Soil samples of two Oxisol and one Paleudult under different years of implementation of no tillage system (NT) and of different layers were collected and subjected to uniaxial compression tests, two times of loading application, 300 seconds per load, according to actual methodology and 30 seconds per load in the laboratory. We analyzed the soil deformation to each load, bulk density, pre-compression stress, recompress and compress indexes. Our results show that the reduction in the time of loading application can be introduced satisfactorily without changes at interested parameters. Furthermore, the soil deformation dynamic in the sample follow the elasto-plastic model used to determine the precompression stress, do not changing for the sigmoidal shape.

show abstract

Zusammenhang zwischen hydraulischer und mechanischer Bodenstabilität in Abhängigkeit von der Belastungsdauer

Cited by 37 publications

References 11 publications

Soil and macro-pores under uniaxial compression. II. Morphometric analysis of macro-pore stability in undisturbed and repacked soil

Soil and macro-pores under uniaxial compression. II. Morphometric analysis of macro-pore stability in undisturbed and repacked soil

Impact of Small-Scaled Differences in Micro-Aggregation on Physico-Chemical Parameters of Macroscopic Biopore Walls

Dynamic of Pressure-Deformation Curve in Uniaxial Compression Test in Different Load Times

Contact Info

Product

Resources

About