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A simple method to evaluate the pullout resistance of extruded geogrids embedded in a compacted granular soil
No full textPullout tests are necessary in order to study the interaction behaviour between soil and geosynthetics in the anchorage zone; hence, the resulting properties have direct implications on the design of reinforced soil structures. Several experimental studies showed the influence of different parameters (reinforcement stiffness, geometry and length, applied vertical effective stress, and geotechnical properties of soil) on the peak and on residual pullout resistance. On the basis of the results of the tests carried out by Moraci and Recalcati [2005. Factors affecting the pullout behaviour of extruded geogrids embedded in a compacted granular soil. Geotextiles and Geomembranes, submitted for publication], a new theoretical method was developed to determine the peak and the residual pullout resistance of extruded geogrids embedded in a compacted granular soil. The method is capable of evaluating both the bearing and the frictional components of pullout resistance, taking into account the reinforcement extensibility and geometry as well as the non-linearity of the failure envelope of backfill soil. The comparison between theoretical and experimental results was favourable, thus confirming the suitability of the proposed approach. © Elsevier Ltd. All rights reserved
Comportamento nel tempo di geomembrane utilizzate per il ripristino del paramento di monte in dighe di calcestruzzo e muratura
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Corrigendum to "A simple method to evaluate the pullout resistance of extruded geogrids embedded in a compacted granular soil". [Geotextiles and Geomembranes 24 (2006) 116-128] (DOI:10.1016/j.geotexmem.2005.11.001)
No full textGeosynthetic Engineering and Vegetation Growth in Soil Reinforcement Applications
No full textIn Italy, since early times, the environmental aspects have always been a key issue on the design and the application. Consequently, the geosynthetic reinforced soil structures consist of vegetated face steep slopes. Furthermore, the use of vegetation has also been recognized and incorporated in engineering practice for erosion control and for stabilization of shallow slopes. Vegetation influences slope stability and erosion process by both mechanical effects and hydrological effects. In particular, in the paper, the mechanical effects of vegetation related to soil stabilization will be described. The purpose of this paper is to present the specific role of vegetation in soil reinforcement applications, by means of the analysis of the available literature on the (i) factors affecting root reinforcement of soil, (ii) experimental tests carried out on roots and on roots-soil system, and (iii) analytical and theoretical models. The erosion applications will not treated in this paper. The use of vegetation in civil engineering and landscape works has grown in importance, even if the specific design standard concerning the use of vegetation for slope stabilization is still under discussion. Therefore, design and management of stabilization systems by plants require an accurate knowledge about the quantitative reinforcing root effects on soil strength
Performance and durability aspects related to the use of geosynthetics in capping systems.
No full textA theoretical method to predict the pullout behaviour of extruded geogrids embedded in granular soils
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