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Dynamic properties of sand-bitumen mixtures as a geotechnical seismic isolation material

机译：砂沥青混合物作为岩土隔震材料的动力特性

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Geotechnical seismic isolation (GSI) has been emerged as an economical and alternative method in recent years that reduces earthquake that will affect the superstructure. Crumb rubber-granular soil mixtures (SRM) are generally used as damping geomaterial in this method. However, the major disadvantage of SRM is that the addition of rubber leads to significant reduction in stiffness of the granular soil. In this study, dynamic properties (secant shear modulus (G(sec)) and damping ratio (D)) of sand and bitumen mixtures (SB) which can be used as damping materials in GSI systems were determined by cyclic triaxial tests. In addition, monotonic triaxial tests were performed to determine the pre- and post-cyclic behavior of the mixtures. In the cyclic tests, the effect of bitumen penetration and content on the energy absorption capacity of the bituminous specimens was examined depending on cyclic stress ratio (CSR), cell pressure and loading frequency. According to the findings, it was determined that higher bitumen penetration and (CSR) result in decrease of G(sec) and increase of D, yet the increase in confining pressure and the increase in loading frequency have the opposite effect. For the specimens prepared with both bitumen types, it was specified that the D increased depending on the increase of bitumen content, and the highest Gsec value was observed to be bitumen content of 8%. Moreover, the findings obtained from the monotonic triaxial tests showed that after a high number of cyclic loading, the peak deviatoric stresses of the SB samples increase slightly.
机译：近年来，土力工程隔震（GSI）已经成为一种经济且可替代的方法，可以减少会影响上层建筑的地震。在这种方法中，通常将碎屑橡胶-粒状土壤混合物（SRM）用作阻尼土工材料。但是，SRM的主要缺点是添加橡胶会导致颗粒状土壤的刚度大大降低。在这项研究中，通过循环三轴试验确定了可用作GSI系统阻尼材料的沙子和沥青混合物（SB）的动力特性（正切剪切模量（G（sec））和阻尼比（D））。另外，进行了单调三轴试验以确定混合物的循环前和循环后行为。在循环测试中，根据循环应力比（CSR），泡孔压力和加载频率，研究了沥青渗透率和含量对沥青样品能量吸收能力的影响。根据发现，可以确定较高的沥青渗透率和（CSR）导致G（sec）减小和D增大，而围压的增大和加载频率的增大却具有相反的效果。对于用两种沥青类型制备的样品，规定D随沥青含量的增加而增加，并且观察到最高的Gsec值为沥青含量为8％。此外，从单调三轴试验获得的结果表明，在大量循环载荷之后，SB样品的峰值偏应力略有增加。

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