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

快速检查土壤液化趋势或快速比较不同土壤的液化潜力迄今为止一直存在问题，因为实验室测试的系统方法非常耗时，并且仅保留给专业实验室。该项目的第一阶段涉及开发一种简单的方法（鉴定试验），用于快速和系统地调查粗粒土壤的液化趋势。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验证。此外，还应澄清常规的极限孔隙比和相对密度是否是评价土壤液化倾向的合适量。在这种情况下，土壤内部结构（样品制备方法）对土壤液化趋势的影响将被检查。由于土壤的液化趋势受到土壤粒度特性的强烈影响，因此应澄清是否有可能使用鉴定试验得出结论，在土壤具有相同粒度分布的情况下，得出不同的颗粒形状或颗粒表面粗糙度。此外，还将检验基于排水识别试验中的体积特性预测土壤液化趋势是否有意义。在鉴定试验研究的基础上，计划进行循环三轴试验分析。

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.