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커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록·키워드
Small-strain shear stiffness ( G 0 ) is a key parameter for seismic ground response analysis and performance evaluation of various earth structures and foundations. To account for its pressure and density dependency, G 0 has been conveniently correlated to mean effective stress ( σ m ′ ) and void ratio ( e ). Such an approach is suitable for conventional uniform materials. However as found in this study, it is not always applicable to estimate the G 0 of sand-gravel mixtures (SGMs), because it essentially fails to account for the combined effects of density and gravel content ( G C ). In this study, aimed at addressing this issue and developing a theoretical framework and empirical correlations suitable for estimating the G 0 of SGMs, a series of bender element laboratory tests were carried out on selected SGMs. Specifically, SGMs were obtained by mixing two clean sands – namely New Brighton Sand (mean diameter, D 50 = 0.2 mm) and Dalton River Washed Sand ( D 50 = 0.75 mm) – and rounded pea gravel ( D 50 = 5.5 mm). Shear wave velocity of specimens having G C = 0, 10, 25, 40 and 60% and prepared at a relative density ( D r ) of 20, 30, 45 and 60% was measured at σ m ′ = 50, 100, 150 and 200 kPa. The laboratory results indicated that G 0 of SGMs increases with increasing both the D r and σ m ′ , whereas the effect of G C would be marginal to significant depending on the limiting and threshold sand contents. To correlate G 0 simultaneously with both G C and D r , the equivalent void ratio ( e f (eq) ) was adopted. It is shown that the use of e f ( eq ) makes it possible to uniquely describe the G 0 of SGMs for any combination of G C and D r over the full range of σ m ′ level applied in this study.
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