数值试验中胶结结构面参数标定方法的研究

Study on Calibration Method of Cemented Structure Plane Parameters in Numerical Test

针对胶结结构面进行数值直剪试验时,准确便捷的标定参数是非常重要的。因此对含胶结结构面岩石进行PFC2D数值直剪试验,分析宏细观参数定量关系,研究胶结结构面力学参数的标定方法。研究结果表明:结构面的内聚力、剪切刚度、法向刚度分别由细观参数的切向黏接强度和内摩擦角、内摩擦角、切向刚度、法向刚度确定;残余强度与细观摩擦系数成正比例关系,法向黏结强度参数不影响结构面力学参数的标定;在确定宏细观参数的定量关系的基础上,提出一种用于胶结结构面进行PFC2D数值直剪试验的参数标定方法,该方法大大简化了胶结结构面参数的标定过程。

It is very important to calibrate the parameters conveniently and accurately in numerical direct shear test of cemented structural plane. Therefore, PFC2 Dnumerical direct shear test was carried out on rocks with cemented structural plane, and the quantitative relationship between macro and micro parameters is analyzed to study the calibration method of mechanical parameters of cemented structural plane. The results show that the cohesion, internal friction angle, shear stiffness, normal stiffness of the structural plane are determined by the tangential bonding strength and internal friction angle, internal friction angle, shear stiffness and normal stiffness of the mesoscopic parameters;The residual strength is directly proportional to the meso-friction coefficient, Normal bond strength parameters do not affect the calibration of structural plane mechanical parameters. On the basis of determining the quantitative relationship between macro and micro parameters, a parameter calibration method for PFC2 Dnumerical direct shear test of cemented structural plane is proposed., which greatly simplifies the calibration process of cemented structural planes parameters.