钻孔岩体结构均质区划分方法研究

岩体结构均质区是针对实际工程特点而划定的成果,在实践过程中需要根据具体工程,抓住主要矛盾后,选择最具影响性的要素作为划分依据。针对高放废物深地质处置工程中钻孔岩体渗透性研究,提出了定性和定量相结合的钻孔岩体结构均质区划分方法。研究表明:基于结构面力学成因的定性岩体结构均质区划分方法存在对破碎带和蚀变带等细节考虑不足的问题,而以定量分区为主的岩体结构统计均质区划分方法(Miller法),未考虑影响岩体渗透性的主要因素结构面隙宽。最后得出将定性和定量相结合的方法来确定均质区效果更佳,这样既可以考虑到更多的结构面参数,同时也可以细化分区范围。此均质区划分方法结果能为后续的结构面网络建模及渗流计算提供数据支持。

Dividing Structural Homogeneity of Rock Mass by Using Boreholes

Structural homogeneity of rock mass is divided according to project features.In practice,we must choose influential elements of the project as the basis of dividing.In this article,a method integrating qualitative and quantitative approaches of dividing structural homogeneity of rock mass is put forward for researching the permeability of rock mass with boreholes for deep geological disposal of high-level radioactive waste.Research results revealed that fracture and alteration zone were not fully taken into account in the qualitative method based on mechanical causes of structural plane.On the other hand,in quantitative method such as Miller method,fracture width as a major factor affecting the permeability of rock mass was ignored.In conclusion,to combining qualitative and quantitative methods could achieve better results by taking into account more parameters of structural plane as well as more detailed dividing parts.The proposed method provides data support for subsequent network modeling and seepage calculation.