The previous researches on purple soils neglected the properties of rock fragments, the distributions of rock fragments, and the influence on soil physical and chemical properties.
以往对紫色土的各种研究都忽略土壤砾石的性质和空间分布，以及对土壤物理和化学性质的影响。
The results show that the soils have, in varying degree inherited some properties of purple sedimentary rocks for their very weak chemical weathering.
结果显示，紫色沉积岩发育的土壤，在一定程度上继承了母岩的特点，化学风化作用微弱。
The basic properties of some expansive soils such as composition, physic-chemical properties and microstructure etc. are studied in this paper.
本文就笔者搜集到的几种不同的膨胀土样进行了基本特性研究，如物质组成、物理化学性质、微观结构等。
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