Evaluation of liquefaction potential of coarse grained soils based on an identification test

对土壤液化趋势的快速检查或对不同土壤的液化潜力的快速比较到目前为止是有问题的，因为实验室测试的系统方法非常耗时，而且只适用于专门的实验室。该项目的第一阶段是发展一种简单的方法（鉴定试验），以便对粗粒土壤的液化趋势进行快速和系统的调查。在第二阶段，将根据循环三轴试验的结果对识别试验进行详细的验证。此外，还应明确常规的极限空隙比和相对密度是否适合用于评价土壤的液化倾向。在此背景下，将研究土壤内部结构（制样方法）对土壤液化倾向的影响。由于土壤的颗粒特性对土壤的液化倾向有很大的影响，因此需要澄清的是，在相同粒度分布的土壤中，是否有可能通过鉴定试验得出不同颗粒形状或颗粒表面粗糙度的结论。此外，它将检验在排水识别试验中基于体积行为的土壤液化倾向预测是否有意义。结合鉴定试验的研究，规划了循环三轴试验的分析。

A quick check of the tendency to soil liquefaction or a quick comparison of the liquefaction potential for different soils has so far been problematic as a systematic methodology for laboratory testing is very time consuming and reserved for specialized laboratories only. The first phase of this project dealt with the development of a simple method (identification test) for a rapid and systematic investigation of the liquefaction tendency of coarse-grained soils. In the second phase, a detailed validation of the identification test based on the results of the cyclic triaxial test will be carried out. Furthermore, it should be clarified whether the conventional limit void ratios and the relative density are suitable quantities for the evaluation of the tendency of soils to liquefaction. In this context, the influence of the soil internal structure (sample preparation method) on the soil liquefaction tendency will be examined. Since the liquefaction tendency of a soil is strongly influenced by the granulometric properties of the soil, it should be clarified whether it is possible, using the identification test, to draw a conclusion on different grain shapes or grain surface roughnesses in case of soils with the same grain size distribution. Furthermore, it will be examined whether the prediction of the soil tendency to liquefaction based on the volumetric behavior in a drained identification test is meaningfull. Accompanying the investigations in the identification test, the analysis in the cyclic triaxial test is planned.