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Undrained response of Sydney sand under non-reversal cyclic loading

机译:不可逆循环荷载下悉尼砂的不排水响应

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Stress history and loading path can significantly influence the cyclic response of sands. It is well known that cyclic behaviour under non-symmetrical cycling is generally different from that under symmetrical loading around zero deviator stress. Anisotropic consolidation prior to cycling in triaxial apparatus changes the behaviour by exerting an initial static shear stress on critical planes. The present paper reports the results from a number of cyclic triaxial tests on anisotropically consolidated samples of Sydney beach sand. The samples are reconstituted in the laboratory and subjected to non-reversal cycling in compression only loading under undrained conditions. Typical test behaviours are described and the effects of cyclic stress ratio and initial state on the response are discussed. It is shown that the state parameter is capable of predicting the cyclic resistance and the trend of excess pore water pressure generation during one-way compressional cycling and, as has been well established for simple loading paths, critical state soil mechanics is able to provide a reliable framework to characterize the behaviour under different cyclic loading conditions.
机译:应力历史和加载路径会显着影响砂土的循环响应。众所周知,非对称循环下的循环行为通常与零偏应力附近的对称载荷下的循环行为不同。在三轴设备中循环之前,各向异性固结会通过在临界面上施加初始静态剪应力来改变行为。本文报道了对悉尼海滩砂的各向异性固结样品进行的许多循环三轴试验的结果。在不排水条件下,将样品在实验室中重构,并在压缩状态下进行不可逆循环。描述了典型的测试行为,并讨论了循环应力比和初始状态对响应的影响。结果表明,状态参数能够预测单向压缩循环过程中的循环阻力和超孔隙水压力的产生趋势,并且对于简单的加载路径已经很好地确定了,临界状态土壤力学能够提供一个可靠的框架来表征不同循环载荷条件下的行为。

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