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贵州西部三叠系永宁镇组（Ty）泥质类岩岩石风化粘土，是暖温带湿润气候条件下经风化、淋滤作用形成的区域性特殊土。这类土保存了母岩原生层面、层理构造，是区域性建筑材料及工业与民用建筑的地基。本文根据工程实践，采用室内试验，标准贯入试验、X射线衍射（XRD）方法分析Ty粘土的特殊工程性质，如高含水量、高孔隙比、高塑限、低承载力及其化学成分、矿物组成和力学性质之间的关系。为研究区域特殊立和解决工程实践问题提供理论依据。
Triassic Yongningzhen Formation (Ty) Argillaceous rock weathering clay in western Guizhou is a regional special soil formed by weathering and leaching in warm temperate humid climate. This kind of soil preserves the original layer of bedding rock, bedding structure, is the regional building materials and industrial and civil construction foundation. According to the engineering practice, the special engineering properties of Ty clay such as high water cut, high void ratio, high plastic limit, low bearing capacity and its chemical composition were analyzed by laboratory test, standard penetration test and X-ray diffraction (XRD) Relationship between mineral composition and mechanical properties. Provide a theoretical basis for the study of regional special legislation and solutions to engineering practice.