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高地应力条件下深部岩体爆破开挖过程中,炸药爆炸产生的能量和岩体开挖释放的应变能共同构成了振动的能量源。采用传统的基于单响药量的萨道夫斯基经验公式及其改进公式预测高地应力条件下爆破开挖诱发振动峰值精度不高。通过量纲分析,提出了一种基于能量平衡原理的振动峰值预测模型。结合锦屏二级深埋引水隧洞爆破试验,以上半洞实测振动数据为学习样本,训练模型;以下半洞实测振动数据为对比样本,检验模型。结果表明:与传统预测模型相比,预测模型具有较高的拟合相关系数和较低的预测均方根误差,可以更好地应用于高地应力条件下爆破开挖诱发振动峰值的预测。
During the blasting excavation of deep rock mass under the condition of high ground stress, the energy generated by explosive explosion and the strain energy released by excavation of rock mass constitute the energy source of vibration. It is not known that the accuracy of peak induced by blasting excavation under high ground stress is not high using the traditional empirical formula of Sadowssons based on single-bolus dose and its improved formula. Through dimensional analysis, a vibration peak prediction model based on energy balance principle is proposed. Combined with blasting test of Jinping second-stage deep-diversion tunnel, the measured vibration data of the above half-hole are learning samples and training models. The measured vibration data of the following half-holes are comparative samples and test models. The results show that compared with the traditional prediction model, the prediction model has a higher fitting correlation coefficient and a lower root mean square error of prediction, which can be better applied to the prediction of peak vibration induced by blasting excavation under high ground stress.