Monotonic and cyclic simple shear response of gravel-sand mixtures
Monotonic and cyclic simple shear response of gravel-sand mixtures
复制标题
砾石-砂混合物的单调和循环简单剪切响应
DOI：
10.1016/j.soildyn.2018.07.016
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发表时间：
2018
影响因子：
4
通讯作者：
Zekkos, Dimitrios
中科院分区：
文献类型：
--
作者：
Hubler, Jonathan F.;Athanasopoulos-Zekkos, Adda;Zekkos, Dimitrios
了解影响碎石土在地震过程中单调和循环响应的因素对基础设施设计是至关重要的。在这项研究中，利用大型循环简单剪切装置对亚圆形9 mm豌豆砾石或角形8 mm石灰石(CLS8)与亚圆渥太华C109砂的混合物进行了单调和循环剪切试验。试验在恒定体积条件下进行，并测量了每个试件的剪切波速。单调和循环试验结果表明，在DR= 为47%时，存在一个具有最大抗剪强度和抗液化能力的最佳混合料比例(豌豆砾石混合料为40%砂，CLS8混合料为60%砂)。研究了颗粒角度、循环应力比和初始垂直应力对松散和致密砾石混合料单调和循环响应的影响。将循环单剪试验的结果与现有的液化触发图版进行了比较，表明需要改进图版来评价砾石土的液化。
Understanding the factors that affect the monotonic and cyclic response of gravelly soils during earthquake events is critical to infrastructure design. In this study a large-size Cyclic Simple Shear (CSS) device was utilized to perform monotonic and cyclic shear tests on mixtures of either subrounded 9 mm Pea Gravel or angular 8 mm Crushed Limestone (CLS8) with subrounded Ottawa C109 sand. Tests were performed in constant volume conditions and shear wave velocity was measured for each specimen. Monotonic and cyclic test results at Dr= 47% show that there is an optimum mixture percentage that results in the greatest shear strength and resistance to liquefaction (40% Sand for Pea Gravel Mixtures and 60% Sand for CLS8 Mixtures). The effects of particle angularity, cyclic stress ratio, and initial vertical stress on monotonic and cyclic response of loose and dense gravel mixtures were investigated and are presented. Comparison of the results from the cyclic simple shear tests with existing liquefaction triggering charts suggests the need for improved charts for gravelly soil liquefaction evaluation.