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A platform for research: civil engineering, architecture and urbanism
EFFECT OF FINES CONTENT IN BACKFILL OF MECHANICALLY STABILIZED EARTH WALL ON WALL PERFORMANCE
Mechanically stabilized earth (MSE) walls are considered an attractive alternative to conventional cast-in-place concrete walls due to its cost efficiency and feasibility. Conventionally, the usage of marginal soil as a backfill of MSE wall is desirable due to the high cost of replacement with clean sand and possible environmental effects. The primary objective of this study is to investigate the effect of fines content in the backfill of MSE wall on wall performance.In order to investigate the potential of using sand with fines as a backfill for mechanically stabilized earth walls, the effect of fines content on clean sand properties was determined. A series of laboratory tests was performed to investigate the effects of low-plastic silty/clayey fines on the physical and mechanical properties of clean sand. Poorly graded clean sand was mixed with fines content percentages varying from 0 to 40%. The results indicated that the measured shear strength parameters of tested sand compacted at 75% relative density using consolidated drained triaxial tests decreased with the increase of fines content. The internal friction angle decreased from 35 ͦ at fines content equal 0% to 26.86 ͦ at fines content equal 40%. As for the sand deformability, the modulus of elasticity (E50) measured at a confining pressure of 100 kPa dropped from a value of 12,823 kPa at 0% fines content to 5,720 kPa at 40% fines content. The void ratio decreased as fines content increased up to 15%, then increased dramatically with further increase in fines content. The effect of fines content on sandy soil-geogrid interface properties was also evaluated by data collection from the geotechnical literature and conducting regression analyses to determine the interface strength reduction factor (Rinter) to be used in the numerical modeling of walls under study. Interface strength reduction factor (Rinter) values obtained from regression analysis were observed to range from 0.95 in case of clean sand to 0.53 in case of sand with 40% fines. The effect of ...
EFFECT OF FINES CONTENT IN BACKFILL OF MECHANICALLY STABILIZED EARTH WALL ON WALL PERFORMANCE
Mechanically stabilized earth (MSE) walls are considered an attractive alternative to conventional cast-in-place concrete walls due to its cost efficiency and feasibility. Conventionally, the usage of marginal soil as a backfill of MSE wall is desirable due to the high cost of replacement with clean sand and possible environmental effects. The primary objective of this study is to investigate the effect of fines content in the backfill of MSE wall on wall performance.In order to investigate the potential of using sand with fines as a backfill for mechanically stabilized earth walls, the effect of fines content on clean sand properties was determined. A series of laboratory tests was performed to investigate the effects of low-plastic silty/clayey fines on the physical and mechanical properties of clean sand. Poorly graded clean sand was mixed with fines content percentages varying from 0 to 40%. The results indicated that the measured shear strength parameters of tested sand compacted at 75% relative density using consolidated drained triaxial tests decreased with the increase of fines content. The internal friction angle decreased from 35 ͦ at fines content equal 0% to 26.86 ͦ at fines content equal 40%. As for the sand deformability, the modulus of elasticity (E50) measured at a confining pressure of 100 kPa dropped from a value of 12,823 kPa at 0% fines content to 5,720 kPa at 40% fines content. The void ratio decreased as fines content increased up to 15%, then increased dramatically with further increase in fines content. The effect of fines content on sandy soil-geogrid interface properties was also evaluated by data collection from the geotechnical literature and conducting regression analyses to determine the interface strength reduction factor (Rinter) to be used in the numerical modeling of walls under study. Interface strength reduction factor (Rinter) values obtained from regression analysis were observed to range from 0.95 in case of clean sand to 0.53 in case of sand with 40% fines. The effect of ...
EFFECT OF FINES CONTENT IN BACKFILL OF MECHANICALLY STABILIZED EARTH WALL ON WALL PERFORMANCE
Ibrahim Elgendy, Abdallah (author)
2021-02-21
Article (Journal)
Electronic Resource
English
DDC:
690
Tall Wall Mechanically Stabilized Earth Applications
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