Method to Reduce Bump at Bridge Approach of Open Expressway Using Horizontal Drilling Replacement

The physical and mechanical properties of bubble mixed light-weight soil (BMLS) were studied through laboratory penetration test, soak test and unconfined compressive strength test, and a method to treat vehicle bump at bridge approach of open expressway was put forward based on the condition, in which the BMLS was used to replace parts of road embankment by horizontally drilling holes on both sides of the embankment. Analyses show that the water absorption of BMLS can reach 25% maximally and its initial unit-weight cannot be restored after drying; after using BMLS horizontal drilling replacement, the surface subsidence and sedimentation rate gradually approach zero; and finally, satisfactory treatment performance for vehicle bump at bridge approach of open expressway has been obtained.