黄淮地区深部黏土工程性质试验研究

总结了黄淮地区深部黏土的物理力学性质,包括密度、含水量、颗粒大小、矿物成分、膨胀性、压缩性、抗剪强度等。研究表明,黄淮地区深部黏土主要为高液限饱和膨胀土,其物理力学性质指标随埋深或液性指数变化一般表现出总体上增大或减小,而局部呈无规则振荡变化的规律。对深部黏土重塑土的常规三轴试验表明,其内摩擦角较一般浅层黏土低,而且在高围压下强度包线出现向下的转折。

ENGINEERING PROPERTIES OF DEEP CLAY IN HUANGHUAI AREA

Engineering properties of deep clay in Huanghuai area, such as density, water content, particle size, mineralogical composition, expansibility, compressibility and shear strength etc., are summarized. It shows that the deep clay in Huanghuai area is saturated expansive soil with high liquid limit. The index properties increase or decrease regularly with the depth or the relative water content, except that they usually oscillate locally. Triaxial compression test with the remolded deep clay shows that its fraction angle is lower than that of the common shallow clay, and the strength envelope deflects with high confining stress.