"超载预压法" can be translated into English as "overloading preloading method" or "surcharge preloading method".
"Overloading preloading method" directly conveys the idea of applying an extra load (overloading) before the main construction to pre-compress the soil.
"Surcharge preloading method" is also commonly used in geotechnical engineering, where "surcharge" refers to the additional load applied for preloading purposes.
Both translations are acceptable, and the choice may depend on the specific context or preference in the field.