Experimental Investigation on Mechanical Properties of Geocell Strips at Low Temperature

Bai, Qiyu; He, Guoqing; Wang, Yong; Liu, Jie

doi:10.3390/ma15155456

Cited by 8 publications

(5 citation statements)

References 27 publications

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“…However, only the normal load, geogrid type, coarse grain content, and particle shape are used in the experimental investigation and analysis, and the sample size of each influencing factor is small. Factors such as the load form, surface roughness of reinforced material, soil temperature, number of layers of reinforcement, and spacing of reinforced material also significantly affect the distribution and evolution of the reinforcement influence zone (Bai et al, 2022). In the future, we can continue to expand the investigation of the influencing factors on the detailed mechanism of reinforced soil as well as increase the number of test samples.…”

Section: Discussionmentioning

confidence: 99%

Experimental study on the fine-scale characteristics of a geogrid-gravelly soil reinforcement influence zone

Liu

Gao

et al. 2023

Front. Earth Sci.

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Based on a specially designed visualization pullout system and digital photographic measurement technology, geogrid pullout tests were conducted by varying the top load, geogrid type, coarse grain content, and particle shape. The evolution and distribution of the reinforcement influence zone and the soil particle displacement field were analyzed, and the effects of various factors on the formation speed of the reinforcement influence zone, gradient layer thickness, and fine-scale particle displacement characteristics were discussed. The study shows that the reinforcement influence zone’s basic form and particle displacement direction do not change with pullout displacement after it is fully developed. The displacement layers in the influence zone are centered at the reinforced soil interface and are distributed in a diffusion gradient. The thickness of each gradient layer in the upper influence zone is greater than that in the lower influence zone. The greater the normal load is, the smaller the particle displacement and thickness of each gradient layer, and the slower the formation of the reinforcement influence zone. Using high-strength geogrids and geogrids with nodes can increase the upper interface thickness and improve the reinforcement influence zone’s formation speed. Horizontal ribs play a major role in forming the reinforcement influence zone, while longitudinal ribs mainly affect the formation speed. The indirect reinforcement effect of the geogrid on angular gravel soil is better than that on pebble soil. As the coarse grain content in the fill increases from 20% to 30%, the reinforcement influence zone forms faster, and the particle displacement of each gradient layer is smaller. When the coarse grain content increases from 30% to 35%, there is no significant change in the forming rate of the reinforcement influence zone.

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Section: Discussionmentioning

confidence: 99%

Experimental study on the fine-scale characteristics of a geogrid-gravelly soil reinforcement influence zone

Liu

Gao

et al. 2023

Front. Earth Sci.

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“…The geogrid parameter includes geogrid material, geogrid planar structure, geogrid filling rate, rib width and rib width of geogrid. Two main materials are used in geogrids: HDPE 31 and PLA. 32,33 Table 1 presents their material properties while Figure 2 shows their corresponding stress-strain relationship.…”

Section: Experimental Equipments and Materialsmentioning

confidence: 99%

Analysis of tensile properties of geogrids for different morphology parameters

Gao

Zhu

2023

Journal of Thermoplastic Composite Materials

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Following the emergence of new morphology geogrids, tensile tests on some of the new morphology geogrids were conducted in this paper for practical engineering options. The study focuses on the tensile testing of 3D printed geogrids to analyze the effects of morphology differences (material, planar structure, filling rate, rib width and rib height) on the tensile properties of geogrids. The test results show that the tensile properties of high density polyethylene geogrids are stronger than those of polylactic acid geogrids. Increasing the filling rate of geogrid can increase the tensile performance while decreasing the rate of tensile performance improvement. In contrast to the elongation at the break of the geogrid, the maximum tensile strength and the maximum tensile modulus increase in the order of bidirectional, triaxial and quadaxial geogrids. When the rib width and the rib height increase by the same amount, the rib height increases the maximum tensile strength of the geogrid more than that of the rib width.

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“…The tests indicated that the elongation of the HDPE strip was sensitive to the specimen shape, and the effect of the welding junction on the HDPE strip cannot be ignored. Bai [31] discussed the effect of low temperatures on the mechanical properties of geocell strips made from high-density polyethylene (HDPE), polypropylene (PP), and polyester (PET). The results revealed that the tensile performance of the PET geocell strip is superior to that of the PP and HDPE geocell strips.…”

Section: Geocell Heightmentioning

confidence: 99%

Effect of the Slit on the Mechanical Tearing Behavior of High-Density Polyethylene and Polyester Geocell Strips

Zuo,

Hao,

et al. 2023

Sustainability

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Geocells are widely applied in numerous infrastructure constructions, like heavy-haul railways and ports. The mechanical tearing behavior of a geocell strip is crucial to the stability of the geocell-reinforced soil structures. At present, extensive studies have been conducted on the tensile characteristics of geocell strips, while limited research has been performed to investigate the post-damage mechanical tearing behavior of geocell strips. Meanwhile, there is also a lack of research on the comparison of performance of strips before and after damage. In this paper, a series of trapezoidal tearing tests were performed on high-density polyethylene (HDPE) and polyester (PET) geocell strips. The tearing test results and failure mode of trapezoidal specimens with a slit were investigated, and the effect of the slit on the strength and deformation characteristics of the specimen were discussed by introducing the “damage ratio of tearing force (RTF)” and “damage ratio of tearing displacement (RTD)”. In addition, the mechanical tearing behavior of HDPE and PET trapezoidal specimens was also compared. The test results indicated that the failure mode of HDPE and PET specimens subjected to tearing force was ductile and brittle failure. The strength and deformation characteristics of post-damage HDPE and PET trapezoidal specimens decreased. The slit had a significant impact on the tearing displacement of HDPE and PET specimens, especially the post-peak tearing displacement. The post-peak tearing displacement of HDPE was 10.99 times that of PET. The peak tearing force of the HDPE specimen without the slit was about 1.61 times that of specimen with the slit. Before local tearing, the peak tearing force of the PET specimen without the slit was about 3.27 times that of the specimen with the slit. The strength damage to the HDPE and PET geocell strips caused by the slit was 38.0%, and 69.46%. The impact of the slit on the tearing force of the PET specimen was greater than that of the HDPE, and was 1.82 times for the HDPE. This study can enhance our understanding of the mechanical tearing behavior of the geocell strip after damage and develop effective mitigation measures.

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Experimental Investigation on Mechanical Properties of Geocell Strips at Low Temperature

Cited by 8 publications

References 27 publications

Experimental study on the fine-scale characteristics of a geogrid-gravelly soil reinforcement influence zone

Experimental study on the fine-scale characteristics of a geogrid-gravelly soil reinforcement influence zone

Analysis of tensile properties of geogrids for different morphology parameters

Effect of the Slit on the Mechanical Tearing Behavior of High-Density Polyethylene and Polyester Geocell Strips

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