基于分形理论的红层软岩填料缩尺料制备方法

采用分形理论研究了在室内采用球磨机制备与现场填料具有相同分形维的缩尺料的方法.基于对模拟现场重复破碎机制的考虑，选用球磨机作为破碎岩块制备缩尺料的设备.通过正交试验，研究了岩块初始粒径、球磨机转数、钢球数等参数对分形模型拟合优度、颗粒分形维的影响.在此基础上，通过中三轴制样试验进一步研究了试样制作过程对缩尺料二次破碎的影响.研究结果表明，对于红层软岩，采用破碎参数：球磨机转数100转，钢球数9个、岩块初始粒径20 mm，可以制备得到与现场原料相同分形维的中三轴试样缩尺料.
Using the fractal theory， the preparation method on the scale sample with same fractal dimension of the in-site filling material produced by ball mill was studied. Based on the requirements of simulating the in-site repetitive crush mechanism， the ball mill was selected to prepare the scale sample. The effects of the experimental influence parameters such as the number of rotation， number of steel balls and initial particles size on the goodness of the fractal simulation and fractal dimensions were investigated by using the orthogonal tests. The effect of secondary crushing on the filling material during the preparation of middle Triaxial specimen was further examined. The results show that with the following crushing parameters: the number of ball mill rotation is 100 rad， the number of steel ball is 9， the initial particle size of the rock is 20mm， the middle Triaxial specimen scale sample with the same fractal dimension as the in-site filling material can be prepared.