Pile foundation construction method with water drilling and static explosive expansion under rock geological condition

A pile foundation construction method with water drilling and static explosive expansion under a rock geological condition comprises the steps of drilling for a core along an inner edge of the pile diameter using a water drilling core machine, separating the pile core and the pile wall to form a free face, drilling in the pile core and arranging expanding explosive, hanging the rock out of the hole with a winding engine after the rock bursts; conducting circulation construction until the formation of holes in the pile foundation is completed. Static explosive expansion is a high-efficiency voiceless broken means which is used CaO crystals coated with an iron phase as an expansion source, a huge expansive force including a radial compression stress and a loop tensile stress is generated with time growth, the expansive force is slowly and stilly applied to a hole wall, and reaches a maximum value after a time, so that the rock bursts and is broken. The pile foundation construction method with water drilling and