摘要
In order to understand the influence of brittleness and confining stress on rock cuttability,the indentation tests were carried out by a conical pick on the four types of rocks.Then,the experimental results were utilized to take regression analysis.The eight sets of normalized regression models were established for reflecting the relationships of peak indentation force(PIF)and specific energy(SE)with brittleness index and uniaxial confining stress.The regression analyses present that these regression models have good prediction performance.The regressive results indicate that brittleness indices and uniaxial confining stress conditions have non-linear effects on the rock cuttability that is determined by PIF and SE.Finally,the multilayer perceptual neural network was used to measure the importance weights of brittleness index and uniaxial confining stress upon the influence for rock cuttability.The results indicate that the uniaxial confining stress is more significant than brittleness index for influencing the rock cuttability.
为了研究岩石脆性和围压条件对岩石可切割性的影响,本文用镐型截齿对4种岩石进行了侵入破岩试验。建立了8组归一化回归模型,用于分析截齿破岩峰值载荷和破岩比能与脆性指数和单轴围压的关系。回归分析结果表明,所建立的回归模型具有良好的预测精度,表明脆性指数和单轴围压对岩石可切割性的影响均表现出非线性。随着单轴围压的增加,岩石可切割性先减低后升高;采用不同脆性指数回归得到的岩石切割性变化趋势不同,对于脆性指数B_(1)和B_(2),岩石可切割性随着脆性指数的增加先增加后降低,然而对于脆性指数B3和B4,岩石可切割性随脆性指数的增加而降低,上述结果表明岩石的可切割性受到岩石抗压强度和抗拉强度的综合影响。此外,利用多层感知神经网络测量脆性指数和单轴围压对岩石可切割性影响的重要权重。结果表明,单轴围压对岩石可切割性的影响大于脆性指数的。
作者
WANG Shao-feng
TANG Yu
WANG Shan-yong
王少锋;唐宇;王善勇(School of Resources and Safety Engineering,Central South University,Changsha 410083,China;Discipline of Civil,Surveying&Environmental Engineering,School of Engineering,University of Newcastle,Callaghan,NSW 2308,Australia)
基金
Project(51904333) supported by the National Natural Science Foundation of China。
