《工业与民用建筑抗震设计规范》(TJ11-78)中对砂土给出了液化可能性的判别式。但对轻亚粘土液化判别式没有规定,只提出“有粒径大于0.05毫米的颗粒占总重40％以上的饱和轻亚粘土层时,应经试验确定在地震时是否可能液化”。本文是根据唐山地震后在天津、唐山、滦县和 In the “Code for Seismic Design of Industrial and Civil Buildings” (TJ11-78), a discrimination formula for the liquefaction potential is given for sand. However, there is no stipulation on the liquefaction discriminant of light sub-clay. It is proposed that “if a saturated light-subclay layer with more than 40% of the total weight of particles with a particle size of more than 0.05 mm is used, it should be determined by experiment whether it is possible to liquefy during an earthquake.” This article is based on the Tangshan earthquake in Tianjin, Tangshan, Jixian and