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Dynamic Properties of Residual Soil over a Wide Range of Strain

机译：宽应变范围内残留土壤的动力特性

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Dynamic properties such as shear modulus (G) and damping ratio (ξ) are important to understand the dynamic and non-linear stress-strain behaviours of soil from small to large strains. Limited studies have been done to understand dynamic and static properties of residual soil. The objective of this paper is to present the dynamic properties of saturated and unsaturated residual soil obtained using a modified cyclic triaxial apparatus. Undisturbed residual soil from Bukit Timah Granite in the northern part of Singapore was used. The test includes wave propagation test and cyclic triaxial test. Bender element based wave propagation test was used to determine the very small-strain shear modulus, G_(max) and small-strain damping ratio, ξ_(min). Effects of varying net confining pressure and matric suction on P-wave, S-wave velocities, stiffnesses, and damping ratios (V_p, V_s, G_(max),, and ξ_(min), respectively) for the residual soil are discussed. Very small-strain dynamic properties from bender element tests are compared with those in the literature. Shear modulus and damping ratio at strains ranging from 0.05 to 1% were estimated using strain-control cyclic triaxial test. The number of cycles applied on the soil specimen was 40 and the loading frequencies were 0.2 and 0.5 Hz. Shear modulus and damping ratio for a wide range of strain were obtained at various effective mean confining pressures for saturated soil and various matric suctions at constant net confining pressure for unsaturated soil. It is observed that effective mean confining pressure and matric suction are crucial parameters which affect shear modulus and damping ratio of soil. Finally, the damping ratio and normalized shear stiffness of the residual soil (ξ and G/G_(max)) for a wide range of strain are found to be consistent with previous studies.
机译：诸如剪切模量（G）和阻尼比（ξ）之类的动力学特性对于理解土壤从小应变到大应变的动态和非线性应力-应变行为很重要。为了了解残留土壤的动态和静态特性，已经进行了有限的研究。本文的目的是介绍使用改进的循环三轴仪获得的饱和和不饱和残余土的动力特性。使用了新加坡北部武吉知马花岗岩的原状残留土壤。测试包括波传播测试和循环三轴测试。基于弯曲元素的波传播测试用于确定很小应变的剪切模量G_（max）和很小应变的阻尼比ξ_（min）。讨论了变化的净围压和基质吸力对残余土壤的P波，S波速度，刚度和阻尼比（分别为V_p，V_s，G_（max）和ξ_（min））的影响。将弯曲元件测试中的非常小的应变动态特性与文献中的特性进行了比较。使用应变控制循环三轴试验估算了在0.05到1％应变范围内的剪切模量和阻尼比。在土壤样品上施加的循环数为40，加载频率为0.2和0.5 Hz。在饱和土的各种有效平均围压和非饱和土的净净围压恒定的情况下，获得了各种应变下的剪切模量和阻尼比。可以看出，有效平均围压和基质吸力是影响土的剪切模量和阻尼比的关键参数。最后，发现在较大应变范围内残余土的阻尼比和归一化剪切刚度（ξ和G / G_（max））与以前的研究一致。

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