红粘土一般具有高含水量、高塑限、高液限特征，极易失水收缩而产生裂隙。贵州铜仁地区某工程中，红粘土勘察中用薄壁取土器采样后，立即用粘胶带或蜡密封，一周左右时间解样，试样壁上常附着一层水珠，土样壁已产生网状裂隙，裂隙深度２ｃｍ～３ｃｍ为主，最深达４ｃｍ，... Red clay is generally characterized by high water content, high plastic limit, and high liquid limit, and it is extremely prone to shrinkage due to loss of water and cracks. In a project in Tongren Prefecture, Guizhou Province, a thin-walled soil sampler was used for sampling in a red clay survey and immediately sealed with adhesive tape or wax. The sample was removed about one week later. A sample of water droplets was often attached to the sample wall. The soil sample wall had been produced. Mesh fissures, crack depth 2cm ~ 3cm, the deepest 4cm, ...