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1·Laboratory test is conducted to study the evolution law of the fissures of Nanyang expansive clay under wetting and drying cycles.

对南阳膨胀土在反复干湿循环作用下的裂隙演化规律进行了室内试验。

2·The contribution of suction to shear strength for the compacted expansive clay was more significant than that for a compacted kaolin.

吸力对该膨胀土抗剪强度的贡献高于压实高岭土。

3·Because soft rocks have low strength and high porosity and contain large amount of expansive clay minerals, the freezing-thawing process of soft rock is complicated.

由于软岩为强度低、孔隙度大、胶结程度差、含有大量膨胀性粘土矿物的松散、软弱岩层。

4·The plastic deformation of expansive clay can be reflected on the height, area and volume changes of soil body, but more significantly on height change due to the confining stress.

在侧限作用下，膨胀土体的范性变形在高度、面积及体积上均有所体现，但在高度方向上的发育最为充分；

5·Compared with common clayey soils, the strength behavior of red clay and expansive soils are more complicated.

与普通粘性土相比，红粘土与膨胀土的强度特性更为复杂。

6·Expansive soil is a kind of swell-shrinking clay with strong damaging to highway. In order to lessen the damage, some efficient measures must be taken with from design.

膨胀土是一种吸水膨胀、失水收缩、胀缩变形显著的粘性土，其主要工程性质对公路有比较强的破坏作用，要减少膨胀土对路基路面的破坏，必须从设计上采取措施加以处理。