Based on the theory of rock and soil engineering,there is a good linear relationship between liquid limit or plastic limit and plasticity index in the clay.But when IP <10,with the decrease of plasticity index,the liquid limit and the plastic limit increase abnormally.The causes of the abnormal phenomenon for the liquid-plastic limit are analyzed with regard to the pseudoplastic phenomena,the test process of liquid limit and the plastic limit water content,the grain-size distribution,the compositions of min...