Study of slope stability based on blasting cumulative damage

The disturbance and damage of adjacent slope caused by blasting excavation, especially the accumulative damage caused by multiple blasting, will inevitably lead to the weakening of rock mechanics parameters, which is an important factor causing the failure of the slope. According to the damage model, the cumulative damage effect of rock slope under blasting load was studied by using the method of sonic wave test, which was used to reduce the shear strength parameters of the slope mass. Based on the strength reduction method and time history analysis method, the change law of slope safety factor under blasting load was studied by using finite element software ANSYS. The results show that the safety factor of the slope is reduced by 5.1%-12.6% under each blasting load, and the safety factor of the slope is decreased by 35.2% because of the cumulative damage, the effect of blasting damage on the safety factor of the slope is greater than that of the blasting load. With the reduction of slope strength parameters, the maximum displacement of the slope bottom node is also increasing under the loading of seismic wave, which is mainly because of the plastic displacement caused by the strength reduction of the slope. The influence of blasting vibration on weak slope is more obvious. © 2016, Science Press. All right reserved.