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Dynamic Properties of Residual Soil over a Wide Range of Strain

机译：广泛菌株对残留土壤的动态特性

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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：剪切模量（g）和阻尼比（ξ）如剪切模量（g）和阻尼比（ξ）的动态性质对于从小到大菌株的土壤的动态和非线性应力 - 应变行为非常重要。已经完成了有限的研究以了解残留土壤的动态和静态性质。本文的目的是呈现使用改性环状三轴仪器获得的饱和和不饱和残余土壤的动态性质。使用了来自新加坡北部的Bukit Timah花岗岩的未受干扰的残余土壤。该测试包括波传播测试和循环三轴测试。基于BENDER元素的波传播试验用于确定非常小的应变剪切模量，G_（最大值）和小应变阻尼比，χ_（min）。讨论了不同净压力和测距对残留土壤的P波，S波速度，刚度和阻尼比（v_p，v_s，g_（max），和ξ_（min）的影响。与文献中的弯曲元件测试中的非常小的应变动态性质。使用应变对照环状三轴试验估计菌株在0.05〜1％的剪力模量和阻尼比。在土壤样本上施加的循环次数为40，负载频率为0.2和0.5Hz。在饱和土的各种有效平均狭窄压力下获得诸如宽范围菌株的剪切模量和阻尼比，在不饱和土的恒定净限制压力下进行饱和土壤和各种测定的各种测量液。观察到，有效的平均狭窄压力和测距吸力是影响剪切模量和土壤阻尼比的关键参数。最后，发现残留土壤的阻尼比和归一化土壤（ξ和g / g_（max））用于各种菌株的抗剪切刚度与先前的研究一致。

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