Full-scale seismic response test on a shallow foundation embedded in tire-derived aggregate for geotechnical seismic isolation

Yarahuaman, Axel A.; McCartney, John S.

doi:10.1016/j.soildyn.2023.108417

Soil Dynamics and Earthquake Engineering

2024

DOI: 10.1016/j.soildyn.2023.108417

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Full-scale seismic response test on a shallow foundation embedded in tire-derived aggregate for geotechnical seismic isolation

Axel A. Yarahuaman,

John S. McCartney

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2024

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Cited by 2 publications

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Response of shallow foundations in tire derived aggregate

Yarahuaman,

McCartney

2024

Geosynthetics International

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This study investigates the quasi-static bearing stress-settlement response of shallow foundations in monolithic tire derived aggregate (TDA) layers having a total thickness of 3 m using a large-scale container and loading system. Tests were performed on footings having a range of widths, embedment depths, shapes, and loading inclinations. In tests where tilting was restricted, a clear bearing capacity was not observed for settlements up to 1.2B, where B is the footing width, but in tests where tilting was permitted bearing capacity was observed between settlements of 0.2B to 0.7B. Surface settlements indicate a dragdown response of the TDA adjacent to the footing extending out to more than 3B from the footing center, while settlement plates beneath the footing indicate a zone of influence of induced settlements of 14% at a depth of 4B. While bearing capacity theories for frictional geomaterials provided a reasonable prediction of the bearing capacity of footings in TDA for most tests, the corresponding settlements may be excessive for engineering applications. Accordingly, a correlation was developed between the theoretical bearing capacity and bearing stress at a settlement of 0.1B. A test with sustained loading indicates slight creep settlements with some stress dependency with magnitudes consistent with past studies.

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Response of shallow foundations in tire derived aggregate

Yarahuaman,

McCartney

2024

Geosynthetics International

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Shear modulus of sand-rubber mixtures: element testing and constitutive modeling

Kavand,

Sarajpoor,

Ghalandarzadeh

et al. 2024

Geosynthetics International

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In this study, a series of resonant column tests was conducted to measure the shear modulus of sand-rubber mixtures at small strain amplitudes (i.e. between 10−4% and 10−4%), considering different rubber percentages and confining stress levels. The results were then combined with data obtained by dynamic hollow cylinder tests to investigate shear modulus degradation of the mixtures over a wider shear strain range. Based on the test results, a new expression was proposed to improve the prediction of maximum shear modulus of sand-rubber mixtures using the modified equivalent void ratio concept. A new constitutive model was also developed for estimation of strain-dependent shear modulus of the mixtures based on the modified hyperbolic framework. The shear modulus of the mixtures was found to be a function of rubber percentage, confining stress, the modified equivalent void ratio and the relative shear stiffness of rubber and sand. The experimental data and the developed models showed that the shear modulus decreased with rubber percentage and increased with confining stress. Moreover, the reference shear strain of the modified hyperbolic model increased with both rubber percentage and confining stress while its curvature coefficient increased more considerably with rubber percentage compared to the confining stress.

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Full-scale seismic response test on a shallow foundation embedded in tire-derived aggregate for geotechnical seismic isolation

Cited by 2 publications

References 28 publications

Response of shallow foundations in tire derived aggregate

Response of shallow foundations in tire derived aggregate

Shear modulus of sand-rubber mixtures: element testing and constitutive modeling

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