为研究水电工程边坡炮孔近区不同损伤模型下岩体爆破时的动力响应,选用HJC模型和RHT模型分别建立岩石单孔爆破损伤模型。基于岩体损伤模拟结果和计算分析,探究了两种损伤模型对岩石爆破损伤分布、地震波能量特性及损伤质点峰值振动速度(PPV)阈值变化规律的影响,结果表明同种工况下RHT模型最终爆破开裂面积近似为HJC模型的一倍;损伤范围越小,炸药冲击波转化为弹性振动波的比例越大;通过拟合损伤度和PPV之间的关系,HJC模型和RHT模型的损伤PPV阈值分别为13.09 cm/s和27.29 cm/s。RHT模型能够更加准确地反映实际边坡近区岩体爆破损伤效应。
Abstract
Single-hole blasting damage models were established by using HJC (Holmquist-Johnson-Cook) model and RHT (Randomized Hough Transform) model respectively for comparison to study the dynamic response of rock mass blasting in the vicinity of the blast hole of hydropower engineering slope under different damage models.The blasting damage distribution,the seismic wave energy characteristics,and the threshold of damage particle peak vibration velocity (PPV) of rock mass under the two models were investigated based on the simulation result and calculation analysis.The results demonstrated that the blasting cracked area in the RHT model is approximately twice that of the HJC model under the same working condition.The smaller the damage range,the greater the proportion of explosive shock wave transformed to elastic vibration wave.The damage PPV thresholds of HJC model and RHT model were obtained by fitting the relationship between damage degree and PPV as 13.09 cm/s and 27.29 cm/s,respectively.In conclusion,the RHT model reflects more accurately the blasting damage effect of rock mass in the vicinity of actual slope.
关键词
边坡炮孔 /
数值模拟 /
损伤模型 /
动力响应 /
损伤特性
Key words
blast hole of slope /
numerical simulation /
damage model /
dynamic response /
damage characteristics
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基金
国家自然科学基金项目(51566010);甘肃省自然基金项目(B061709)
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