A "superloading" yield surface concept is newly established for describing the process of decay/collapse of soil skeleton sructure in natural soils, by which sand is first clearly distinguished from clay. Delayed compression of clay and compaction/liquefaction of sand, which will be the typical apparent differences between clay and sand, are numerically solved consistently, through which the necessity of "All Soils All States All Round Geo-Analysis Integration" is emphasized particularly for the "antiseismic geotechnical engineering."