膨胀性粘土缺乏细料部分，故必须添加其它骨料。

The lack of fine fractions in the expanded clay necessitates the addition of other aggregates.

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分析认为，膨胀性粘土的存在是影响低渗透油藏渗流特性的关键因素；

The study shows that the swelling clay is the key factor that affects considerably the percolation feature of low permeability reservoir.

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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。

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.

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