By modeling vacuum preloading and surcharge preloading in different depths of the soil using the laboratory test; then soil properties before and after test

axial settlements

volume changes of two methods are analyzed. And some useful conclusions are drawn; soil properties are improved and penetrability after vacuum preloading is better than the one after surcharge preloading

while compressibility after surcharge preloading is better than the one after vacuum preloading. Settlement after surcharge preloading is much bigger than the one after vacuum preloading

and it is constringed more slowly than the one of vacuum preloading. Volume change after vacuum preloading is 1.8 times more than the one after surcharge preloading

and volume change of shallow soil is more than the one of deep soil after vacuum and surcharge preloading.