天然黏土一般都具有结构性，其变形过程必然伴随着结构的破坏。
The structure of natural clays must be destroyed during the deformation process.
考虑到天然黏土不等向固结历史的影响，试验土样在循环剪切前均先K0固结至原位应力状态。
Taking the stress-induced anisotropy into account, all the specimens are initially restored to the in-situ stress state under K0 consolidation.
机制花砖（通过用作地面装饰材料）和陶瓦砖，采用天然黏土制成，耐力较小并有空隙，但因其经济实惠且造型美观而广为使用。
Quarry tiles (used for flooring) and terra-cotta, made of natural clays, are less hard and more porous But very popular for economic and aesthetic reasons.
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