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Author: search.filters.author.Ayawanna, JiratchayaSubject: search.filters.subject.RSS

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    Item type:Publication,
    Evaluation of Interface Shear Strength Coefficient of Alternative Geogrid Made from Para Rubber Sheet
    (2023-04-01)
    Liangsunthonsit, Anubud
    ;
    Jaroonrat, Pakkapon
    ;
    Ayawanna, Jiratchaya
    ;
    Naebpetch, Weerawut
    ;
    Chaiyaput, Salisa
    In this work, elastic natural rubber compound sheet (RCS) and ribbed smoked sheet grade 3 (RSS) were studied as alternative replacements for polymer geogrid for soil reinforcement. In order to investigate the reinforcing effectiveness in three distinct environments using the interface shear strength coefficient (R<inf>in</inf>) by the large-scale direct shear test, the RSS and RCS geogrids were installed independently in sand, lateritic soil, and clay. Using either an RSS geogrid or RCS geogrid, the average R<inf>in</inf> is progressively smaller in reinforced sand, lateritic soil, and clay, respectively. Higher tensile strength of reinforced materials using the RCS geogrid than those using the RSS geogrid is encouraged by the better elastic characteristics of the RCS geogrid. Thus, utilizing the RCS geogrid-reinforced materials can better increase the shear strength of coarse-grained soil such as sand and gravel.
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    Natural Para Rubber in Road Embankment Stabilization
    (2022-02-01)
    Chaiyaput, Salisa
    ;
    Arwaedo, Nakib
    ;
    Jamsawang, Pitthaya
    ;
    Ayawanna, Jiratchaya
    This is the first study on “ribbed smoked sheets (RSS)” as a geogrid reinforcement in geotechnical engineering. An RSS is a kind of natural para rubber. RSS (grade 3) was designed as a biaxial geogrid with an aperture size of 20 mm × 20 mm and a spacing of 20 mm. The RSS was found to be a significant functional layer when applied to the subbase lateritic soil layer. The lateritic soil with an RSS reinforcing layer was greatly improved regarding the California bearing ratio (CBR). Numerical simulation using two-dimensional finite element software was used to determine the optimal number and positions of the RSS reinforcing layers in road embankment stabilization. The simulation data in terms of horizontal displacement of unreinforced road embankments was validated by the collected data from the actual construction site. The RSS reinforced layer was varied from one to three layers under 61 analysis conditions. The highest safety factor was obtained with two layers of RSS at 0.1H below the top of the road embankment and 0.4H below the first RSS layer, suggesting a suitable installation of the RSS reinforcing layer. The RSS is thus strongly recommended as a reinforcing material in low CBR lateritic soil for the road embankment.