摘要
裂隙岩体渗透性是高放废物处置库场址选择和评价的重要因素。钻孔岩体渗透性特征主要依靠钻孔电视获得的裂隙几何参数来确定。针对传统统计法确定裂隙几何参数存在的不足和误差,提出新的统计方法和计算公式。研究结果如下:(1)由于岩体裂隙空间分布多变性,提出以裂隙密度和产状为基础的岩体均质区划分方法;(2)钻孔岩体裂隙发育优势产状采用聚类分析方法来统计;(3)裂隙间距的确定考虑了测量误差的影响,并提出修正公式;(4)裂隙有效水力隙宽提出按照力学成因来确定。将获得的裂隙几何参数代入渗透张量计算程序中,得到钻孔岩体的渗透张量以及渗透主值和主渗透方向,从而为钻孔岩体渗透性分析提供依据。
The permeability of jointed rock plays an important role in site selection and evaluation of high-level radioactive waste repository. The characteristics and magnitude of the permeability of rock obtained from the drilling borehole depend on the geometry parameters of fractures which are recorded with televised video in the borehole. To overcome the defects and errors of the traditional statistical method in determining the geometric parameters of fractures,a new statistical method was proposed. According to the spatial variability of the rock fractures,a homogeneous area partition was proposed based on the density and occurrence of fractures. The preponderant group of the fractures development was determined with the method of clustering analysis. An improved formula was proposed with the consideration of the influence of measurement error in determining the fracture distances. The effective hydraulic aperture of fracture was determined according to the mechanical causes. The permeability tensor,principal permeability and the main direction of seepage of rock was obtained after the geometry parameters of fracture were input into the program for the calculation of permeability tensor.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2015年第9期1758-1766,共9页
Chinese Journal of Rock Mechanics and Engineering
关键词
岩石力学
裂隙
几何参数
统计方法
渗透张量
rock mechanics
fractures
geometry parameters
statistical method
permeability tensor
