A transitional mode of behaviour is seen in some soils where the specific volumes of samples do not converge to the same values at the same stress state within the ranges of strains that can be achieved in laboratory tests so there are no unique normal compression or critical state lines. This type of behaviour has been found in different soils but not previously in soils resulting from decomposed igneous rocks. In order to investigate the possibility of transitional mode of behaviour in a decomposed volcanic rock, an extensive series of one-dimensional compression and triaxial tests were conducted on samples in reconstituted and intact states. The important features of transitional mode of behaviour in soils have been identified, that is, the presence of non-unique and parallel normal compression and critical state lines. The behaviour of the soil is therefore dependent on the initial specific volume. The degree of transitional behaviour is strong, particularly in the reconstituted samples, but it is less clearly identified in the intact samples due to the small range of initial specific volumes available. These observations indicate that the transitional mode of behaviour, previously seen in sedimentary soils and artificial soil mixtures, can be extended to some weathered igneous rocks. Determining the effects of structure is difficult due to the non-unique intrinsic properties, but nevertheless, the effects of structure have been identified and discussed.

在某些土壤中观察到一种过渡的行为模式，在实验室测试可以达到的应变范围内，在相同的应力状态下，特定体积的样品未收敛到相同的值，因此没有唯一的正常压缩或临界状态线。这种类型的行为已在不同的土壤中发现，但以前在由火成岩分解产生的土壤中未发现。为了研究在已分解的火山岩中过渡行为方式的可能性，对处于复原状态和完好状态的样品进行了一系列的一维压缩和三轴试验。已经确定了土壤中行为过渡模式的重要特征，即存在非唯一且平行的法向压缩和临界状态线。因此，土壤的行为取决于初始比容。过渡行为的程度很强，尤其是在重构样品中，但由于可用的初始比容范围较小，因此在完整样品中很难清楚地识别出来。这些观察结果表明，以前在沉积土壤和人造土壤混合物中观察到的过渡行为方式可以扩展到某些风化的火成岩上。由于非唯一的固有特性，确定结构的影响很困难，但是，结构的影响已经被确定和讨论。但由于可用的初始比容范围较小，因此在完整样品中很难清楚地识别出来。这些观察结果表明，以前在沉积土壤和人造土壤混合物中观察到的过渡行为方式可以扩展到某些风化的火成岩上。由于非唯一的固有特性，确定结构的影响很困难，但是，结构的影响已经被确定和讨论。但由于可用的初始比容范围较小，因此在完整样品中很难清楚地识别出来。这些观察结果表明，以前在沉积土壤和人造土壤混合物中观察到的过渡行为方式可以扩展到某些风化的火成岩上。由于非唯一的固有特性，确定结构的影响很困难，但是，结构的影响已经被确定和讨论。