Method for plugging engineering drill hole by adopting cement-soil slurry and application of cement-soil slurry

The invention discloses a method for plugging an engineering drill hole by adopting cement-soil slurry. The formula of the adopted cement-soil slurry is as follows: the preparation ratio of clear water to cement to bentonite is 1: (0.18-0.23): (0.57-0.62); The method for plugging the engineering drill hole by adopting the cement-soil slurry comprises the following steps of step 1, preparing the cement soil slurry; 2, performing first-time plugging; and 3, checking the plugging condition. Drill hole plugging is finished. The method has the advantages that the defects that in the prior art, an underground cavity and holes are filled with cement mortar, a cement mortar body is shrunk, but fluidity is poor, the specific gravity is large, after a soil body cavity is filled with the cement mortar body, a lower soil body settles, the cement mortar body is disengaged from a top soil body, and the filling cost of the cement mortar is high are overcome; and the construction procedures are reduced, the engineering drill