The hydraulic fracturing of rock mass cracking is one of the important influencing factors that causes rock mass cracking and leakage and even construction water gushing

which is also the research hotspot in geotechnical engineering field. The disturbance effect on crack propagation of aquiferous rock cracking by blasting excavation is analyzed based on fracture mechanics; and the results show that

under disturbance of blasting excavation

the cracking propagation of aquiferous rock relates to the strength and incident angle of blasting stress wave

the value and direction of ground stress

the value of pore water pressure

the crack dip

and the fracture toughness

etc. The effect of blasting stress wave equals to increasing the pore water pressure inside rock mass cracks

which means per 1 cm/s peak particle vibration velocity equals to increasing 0.1 MPa pore water pressure; and the larger the blasting vibration velocity is

the greater the blasting disturbance load will be. The change of ground stress and pore water pressure caused by rock mass excavation around rock mass cracks have complex influence on instability and propagation of cracks

which may change the instability and propagation model of cracks.