块体化程度指标的内在影响机制

Internal influence mechanism of blockiness index

块体化程度作为评价岩体完整性的一种新指标,能从三维角度反映岩体的破碎程度。为准确把握块体化程度指标影响参数的敏感性,采用结构面网络逆建模技术,构建裂隙间距、裂隙延展性和裂隙产状3种主要影响参数作用下的系列三维裂隙网络模型,计算各模型的块体化程度值;利用灰色关联分析法,计算分析各影响参数与块体化程度指标之间的灰色关联度。结果表明:块体化程度指标与裂隙间距呈负相关关系,与裂隙延展性呈正相关关系,与裂隙产状没有明显关系;裂隙间距、裂隙延展性和裂隙产状与块体化程度指标的灰色关联度分别为0.7799,0.6225和0.34,裂隙间距对块体化程度指标的影响最大,其次为裂隙延展性,裂隙产状的影响程度最小。研究成果为完整构建裂隙岩体块体化程度评价方法体系奠定了理论基础。

As a new index to evaluate the integrity of rock mass,blockiness can reflect the degree of rock fragmentation from a three-dimensional perspective.In order to accurately grasp the sensitivity of the influence parameters of the blockiness index,a series of three-dimensional fracture network models under the influence of three main influence parameters,namely fracture spacing,fracture persistence and fracture occurrence,are constructed by using the joints and interfaces network inverse modeling technology,and blockiness value of each model is calculated;the influence parameters and blockiness index are calculated and analyzed by using the grey correlation analysis method.The results show that the index of blockiness has negative correlation with fracture spacing,positive correlation with fracture persistence,and no obvious relationship with fracture occurrence;the grey correlation degree of fracture spacing,fracture persistence and fracture occurrence with the index of blockiness is 0.7799,0.6225 and 0.34,respectively,and the influence of fracture spacing on the index of blockiness is the largest,followed by fracture persistence,the influence degree of fracture occurrence is the least.The research results lay a theoretical foundation for the complete construction of the evaluation method system of the degree of fragmentation of fractured rock mass.