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为得到不同工程条件下岩石化爆自由场分布特征,采用工程类比的方法,在试验数据和经验公式的基础上,采用加权最小二乘法对改进自由场应力波公式参数进行拟合。在分析参照工程与参照试验岩石及炸药参数的基础上,根据设计工程与参照工程和参照试验中岩石介质的波阻抗、弹性模量、炸药当量等参数的相似程度定义权重,将等值平均改为加权平均,对各经验公式进行加权最小二乘拟合。在确保类似工程和试验对设计工程具有更大参考价值的前提下,确定自由场应力波计算的改进公式,使爆炸荷载计算公式对设计工程具有更好的适用性。
In order to get the distribution characteristics of free-field rockburst under different engineering conditions, the method of engineering analogy was used to fit the formula of the free-form stress wave equation based on the test data and empirical formula by using weighted least square method. Based on the analysis of the parameters of reference test and reference test rock and explosive, the weights were defined according to the similarities of parameters such as wave impedance, elastic modulus and explosive equivalence of rock media in design engineering, reference engineering and reference test, For the weighted average, the empirical formula for the weighted least squares fit. On the premise of ensuring that similar projects and experiments have more reference value for design engineering, the improved formulas of free-field stress wave calculation are determined so that the formula of blasting load has better applicability to design engineering.