The slot-cut method is put forward

aiming at the problem of frequent rockburst for hydropower projects in Southwest China. The mechanism and method of slot-cut prevention of delayed rockburst are discussed by theoretical analysis

numerical simulation

and construction technology. The existence of slots provides extra space for circumferential deformation

thus decreases the circumferential stress on the surface of surrounding rock mass. The plastic strain formed on the slot bottom and between slots absorbs part of the elastic strain energy stored in the rock mass. It’s revealed by the numerical analysis that the location

spacing and number of slots should be arranged reasonably for better prevention effect. In actual practice

the slots-cutting operation should be well designed

for more accurate control on the dimensions of slots

and can be accomplished by drill-blasting or accumulative explosives pre-split blasting.