Secondaryclay minerals in rock may bring about marked changes in strength and deformability of parent minerals, mineral aggregation and rock and promote rock to evolve toward loose medium.
The red clay and secondary red clay widely distributed in Liuzhou City have low-middle swell shrinking property as well as more higher strength.
柳州市广泛分布的红粘土及次生红粘土层强度普遍较高，但具有弱-中等的胀缩性。
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The author considers that temperature and sustained time are the important conditions of mutual compensation during the diagenetic transition of clay minerals, and the pressure is a secondary factor.