In these tests, the clay content of silt increases as 3%, 6%, 9%, 12%, 15% while the sand content remains unchanged and the silt content increases as 50%, 60%, 70%, 80% while clay content remains unchanged.

• 粉土样的粘粒含量变化为3%25、6%25、9%25、12%25、15%25，粉粒含量变化为50%25、60%25、70%25、80%25。