基于脆性指数和熵权理论的岩体可爆性分级方法

Rock blastability classification method based on brittleness index and entropy weight theory

为提升岩体可爆性分级的准确性用以指导爆破作业,将岩石脆性作为反映岩石爆破特性的指标之一,选取岩石单轴抗压强度与单轴抗拉强度比值作为岩石脆性指数,将岩石脆性指数、岩石容重、完整系数、动载强度作为岩体可爆性分级指标,运用熵权法建立属性识别模型,进行岩体可爆性分级。结果表明,脆性指数作为可爆性分级指标是合理的;采用熵权法进行岩体可爆性分级,降低了各指标权重计算的人为干扰,更加客观实际。

In order to improve the accuracy of rock blastability classification for guiding blasting operation,the rock brittleness is taken as one of the indexes for reflecting the rock blasting characteristics.The ratio of rock uniaxial compressive strength to uniaxial tensile strength is selected as the rock brittleness index,and the rock brittleness index,rock bulk density,integrity coefficient and dynamic load strength are used as the rock blastability classification index.An attribute recognition model is established by using the entropy weight method to classify rock blastability.The results show that brittleness index is reasonable as a blastability classification index,and the application of the entropy weight method to classify the rock blastability reduces the artificial interference in the calculation of the weight of each index,and is more objective and practical.