Impact of Lithoseismic Layering on Soil Compaction: Insights for Using Remoulded Geological Materials as Pavement Bases and Fillings.

Autor: Igwe, Ogbonnaya, Ugwoke, Tochukwu A. S.
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Zdroj: Geotechnical & Geological Engineering; Jul2024, Vol. 42 Issue 5, p3579-3594, 16p
Abstrakt: The present research assesses possible effect(s) of relative in situ compaction energy and grain size gradation on compaction parameters of remoulded geological materials. Ten (10) points, in North-eastern Nigeria, were each drilled to 60 m to create seismic refraction data acquisition wellbores and also recover remoulded geological materials. The seismic acquisition was to ascertain velocities and thicknesses of lithoseismic layers occurring from 0 to 60 m depth. The remoulded materials collected from each lithoseismic layer were subjected to sieve analysis and compaction test. The sieve was to determine their grain size gradation while the compaction was to determine their compaction parameters viz: optimum moisture content (OMC) and maximum dry density (MDD). The seismic acquisition revealed the occurrence of weathered layers with velocities (Vp) and thicknesses (T) ranging from 351 m/s to 629 m/s and 3.4 m to 11.9 m respectively; sub-weathered layers with Vp and T ranging from 830 m/s to 1507 m/s and 21.4 m to 48.2 m respectively; and unweathered layers with Vp ranging from 1607 m/s to 2023 m/s. The remoulded materials were composed of mostly sand and fine particles. Thicknesses and sand content affect the velocities of weathered lithoseismic layers. The weathered materials have OMC and MDD ranging from 12.71 to 21.58% and 1.54 to 1.88 mg/m3 respectively; sub-weathered materials have OMC and MDD ranging from 9.20 to 19.66% and 1.55 to 2.01 mg/m3 respectively while unweathered materials have OMC and MDD ranging from 10.32 to 23.11% and 1.41 to 1.92 mg/m3 respectively. The sub-weathered remoulded materials attained MDD at lower OMC relative to the weathered remoulded materials. Grain size gradation controlled the MDD of the unweathered materials more than lithoseismic layering. This work has shown that in situ compaction of geological materials manifest in their remoulded compaction parameters and this is to be considered when using geological materials as pavement bases or fillings. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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