Method for solidifying new and old roadbed joint part by using biological enzyme material

The invention discloses a method for solidifying a new and old silty soil roadbed combination part by using a biological enzyme material, and the method comprises the following steps: carrying out enlarged culture on the biological enzyme material in advance, and then carrying out widening construction on a new and old silty soil roadbed by using the biological enzyme material. The biological enzyme is carbonate mineralizing bacteria. The bio-enzyme material is a mixed material prepared by adding an induction reaction solution into a carbonate mineralizing bacterium culture solution. The method innovatively solves the problem that the joint of the new and old silt subgrade is difficult to treat, widens the new subgrade under the condition that the old subgrade is still kept in an operationstate, relieves the traffic pressure, effectively reduces the differential settlement of the new and old subgrades, improves the shear strength of the soil body, ensures the integrity of the new andold subgrades, and improve