基于DIP技术钻孔结构面参数与强度相关性研究

Correlation between structural surface parameters and strength of drilling holes based on DIP technology

为实现寺河煤矿井下巷道围岩体强度的快速准确定量评价,综合考虑围岩强度测定过程中的人为与机械误差影响,建立了围岩结构面几何参数与强度的非线性数学模型。以该矿井东六盘区63022巷、63021巷与东六回风二巷围岩结构钻孔窥视与强度测定结果为基础,采用数字图像处理(DIP)、理论分析与数理统计相结合的方法,分析了结构面几何参数与强度的相关性,并确定各参数对强度的影响程度。研究结果表明:钻孔窥视图像的灰度变化曲线可以确定岩层内部成分差异与宏观缺陷;数学回归模型可用于对结构面轮廓变化的趋势预测;结构面倾角、面积与分形维数为正相关性;分形维数对力学强度的正相关性影响程度最大,权重占比99.51%。

To achieve a rapid and accurate quantitative evaluation of the surrounding rock strength of the roadway in Sihe Mine,a nonlinear mathematical model was established to consider the influence of human and mechanical errors during measurement.The model considers the geometric parameters and strength of the surrounding rock structural plane.Using drilling results and strength measurements in 63022,63021,and the return airway,the correlation between the geometric parameters of the structural surface and strength was analyzed.Digital image processing(DIP),theoretical analysis,and mathematical statistics were used to determine the degree of influence of each parameter on strength.The results show that the gray-scale curve of the drilling image can determine the compositional difference and macroscopic defects of the rock layer.The mathematical regression model can predict the trend of the outline change of the structural plane.The inclination angle,area,and fractal dimension of the structural plane are positively correlated,with fractal dimension having the greatest influence on mechanical strength(99.51%).