关键词: 顺层岩质边坡, 爆破荷载, 损伤特征, 多次爆破, 累积损伤

Abstract: Damage control of bedding slope under the blasting load is a common problem in the slope engineering field. In order to investigate the damage characteristics of bedding slope under blasting loads, four on-site blasting tests were carried out, from which the variations in sound velocity at different positions before and after the blasting were investigated. The 10% reduction of the sound velocity was regarded as the critical line of damage. The damage characteristics of the slope under single and multiple blasting operations were analyzed, and the correlation between the amount of explosive and the damage range of slope was developed. Besides, 3DEC software was used to analyze the damage development of slope under blasting load. Both the field test and numerical analysis results suggest that the damage range of slope increases with the increasing amount of explosive, and that the damage degree of slope clearly increases with the times of blasting operation. However, the former does not change linearly with the latter. Likely due to that the numerical simulations only consider the rock joint but ignore the influence of rock crack, the damage ranges of slope obtained from the numerical analyses are generally smaller than those measured from the field tests.

Key words: bedding rock slope, blasting load, damage characteristics, multiple blasts, cumulative damage