Interaction Between Soils and Geosynthetic Layers in Large-Scale Ramp Tests

Abstract

Ramp tests can be used for the evaluation of bond strength between soils and geosynthetics and between different layers of geosynthetics. This paper presents a theoretical and experimental study on the use of this type of test to measure soil-geosynthetic interface bond strength. Granular and cohesive soils and a wide range of geosynthetic types were employed in the tests. Tests with one to three geosynthetic layers were carried out with measurements of mobilised tensile loads. The results show the factors that may affect test results, such as apparatus size, soil type, geosynthetic tensile stiffness, and surface characteristics. Mechanisms of interface failure and of load transference between different layers are also identified and discussed.

Soil Geosynthetic Interaction: Design Parameters from Experimental and Theoretical Analysis

“…Therefore, the dimensions of the boxes, especially when testing interfaces involving the soil, should take into account the need of a contact surface ensuring a representative tested interface, the need to minimize edge effects, and the difficulties of placing a large volume of soil. In literature, the interface area of the specimens varies from 0.005 [110] to 2.304 m 2 [104], depending on the considered interface.…”

“…In particular, the effective normal stress acting on the interface decreases (σ' v =σ' 0 cos β) as the plane inclination β increases [83,104,109]. The level of nonuniformity of the normal stress distribution along the interface is directly proportional to the tilting angle and to the height of the box center-mass, and inversely proportional to the box length.…”

“…The inclined plane test is the most appropriate tool [84,[102][103][104][105][106] for the characterization of the interaction between soil-geosynthetic and geosynthetic-geosynthetic at low normal stress typically found in such applications. Fig.…”

“…Fig. 48 Inclined plane device at different test configurations: a geosynthetic-geosynthetic interface, b soilgeosynthetic interface, and c soil-soil interface (after Pitanga et al [106] and Reyes Ramirez and Gourc [105]) Several works on inclined plane test (tilting table or ramp test) can be found in literature [10,83,84,102,[104][105][106][107][108][109][110][111][112][113]. In these works, despite the test is based on simple geometrical and mechanical concepts, variations between testing equipment can be found regarding apparatus arrangement, testing methodology, results interpretation, and experimental conditions.…”

Soil–geosynthetic inclined plane shear behavior: influence of soil moisture content and geosynthetic type

“…Inclined plane shear behavior at soil-geosynthetic and geosynthetic-geosynthetic interfaces have been studied by several authors (among others: Izgin and Wasti, 1998;Wasti and Ö zdü zgü n, 2001;Costa-Lopes et al, 2001;Briançon et al, 2002;Palmeira et al, 2002;Reyes Ramirez and Gourc, 2003;Narejo, 2003;Pitanga et al, 2009;Eid, 2011;Briançon et al, 2011, Lopes, 2013.…”