Evaluation of Microscopic Behaviour for Clay by Using Micro-indenter and its Application

在这项研究中，通过微压痕试验测试了粘土的剪切强度，重点是对粘土的微观力学行为进行定量评估。微压入试验和无侧限压缩试验得到的粘聚力的对比表明，循环加载的微压入试验结果低估了粘聚力，而单调加载的粘聚力则准确地估计了粘聚力。值得注意的是，加载速率的选择应根据粘土样品，因为强度受速率效应的影响。这些结果表明，可以通过微压痕试验来评价粘土的微观力学行为。

In this study, the shear strength determined by a micro indentation test was examined focusing on the quantitative evaluation of the micro-scale mechanical behaviour of clay. The comparison of the cohesion obtained from the micro indentation test and unconfined compression test for clay samples indicated in the micro indentation test results by cyclic loading underestimate the cohesion while those by monotonic loading estimate the cohesion accurately. It is noted that the loading rate should be selected according to the clay sample because strength is affected by the rate effect. From these results, it was found that the microscopic mechanical behaviour of clay can be evaluated by mean of the micro indentation test.