Effect of initial relative density on the post-liquefaction behaviour of sand
Effect of initial relative density on the post-liquefaction behaviour of sand
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DOI：
10.1016/j.soildyn.2017.02.007
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发表时间：
2017-06
影响因子：
4
通讯作者：
M. Rouholamin;S. Bhattacharya;Rolando P Orense
中科院分区：
文献类型：
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作者：
M. Rouholamin;S. Bhattacharya;Rolando P Orense
了解循环/动态荷载下土壤的行为一直是岩土工程中具有挑战性的课题之一。可液化土壤的响应已得到充分研究，但沙子液化后的行为需要更好的了解。在本文中，通过使用循环三轴装置进行的多个系列的多阶段土单元试验来研究砂的液化后行为。使用四种类型的砂，其中砂首先被液化，然后单调剪切以获得应力-应变曲线。测试结果表明，液化后阶段砂的应力-应变行为可以使用三个参数建模为双线性曲线：初始剪切模量 (G 1)、临界状态剪切模量 (G 2) 和膨胀后剪切应变 (γ p o s t− d i l a t i o n)，即膨胀开始时的剪切应变。结果发现，这三个参数取决于沙子的初始相对密度。此外，观察到随着相对密度的增加，G 1 和G 2 都增加，并且γ 位置- 膨胀减少。结果的实际应用是生成液化土的 py 曲线。
Understanding the behaviour of soils under cyclic/dynamic loading has been one of the challenging topics in geotechnical engineering. The response of liquefiable soils has been well studied however, the post liquefaction behaviour of sands needs better understanding. In this paper, the post liquefaction behaviour of sands is investigated through several series of multi-stage soil element tests using a cyclic triaxial apparatus. Four types of sand were used where the sands were first liquefied and then monotonically sheared to obtain stress-strain curves. Results of the tests indicate that the stress-strain behaviour of sand in post liquefaction phase can be modelled as a bi-linear curve using three parameters: the initial shear modulus (G 1), critical state shear modulus (G 2), and post-dilation shear strain (γ p o s t− d i l a t i o n) which is the shear strain at the onset of dilation. It was found that the three parameters are dependent on the initial relative density of sands. Furthermore, it was observed that with the increase in the relative density both G 1 and G 2 increase and γ p o s t− d i l a t i o n decreases. The practical application of the results is to generate py curves for liquefied soil.