In this paper, the permeability and porosity of self-prepared artificial columnar jointed rock masses (CJRM) with different columnar dip angles under different pore pressures during cyclic loading-unloading of confining pressure were measured. The experimental results indicate that the gas permeability of the artificial CJRM gradually decreases with the rise of pore pressure due to the existence of Klinkenberg effect, and Klinkenberg effect gradually decreases with the rise of columnar dip angle. The existence of it improves significantly the intrinsic permeability. Besides, the intrinsic permeability and porosity of artificial CJRM are more sensitive to the first loading than that of the intact cement mortar specimen. The permanent deformation of pores in the specimens mainly appears in the first cycle, and the subsequent cycles have smaller effects on the intrinsic permeability and porosity. The permanent deformation results in the intrinsic permeability, and porosity in the loading process is always higher than those in the unloading process. The intrinsic permeability gradually increases with the growth of columnar dip angle, exhibiting obvious permeability anisotropy. Under high confining pressure, the permeability anisotropy of artificial CJRM is less than that under low confining pressure. Meanwhile, under the same confining pressure, during the repeated loading-unloading cycles, the permeability anisotropy decreases gradually. The existence of a representative element volume (REV) for CJRM is verified; thus, the equivalent continuum media model can be utilized to analyse the seepage characteristics of CJRM.

本文测量了自压人工柱状节理岩体（CJRM）在不同孔隙压力下不同围压下围岩在围压作用下的渗透率和孔隙率。实验结果表明，由于克林根贝格效应的存在，人工CJRM的透气性随着孔隙压力的升高而逐渐降低，克林肯贝格效应的升高随柱状倾角的增加而逐渐降低。它的存在显着提高了固有渗透率。此外，与完整的水泥砂浆标本相比，人工CJRM的固有渗透率和孔隙率对首次荷载更为敏感。标本孔隙的永久变形主要出现在第一个循环中，并且随后的循环对固有渗透率和孔隙率的影响较小。永久变形会导致固有渗透率，并且加载过程中的孔隙率始终高于卸载过程中的孔隙率。本征渗透率随柱状倾角的增大而逐渐增大，表现出明显的渗透率各向异性。在高围压下，人工CJRM的渗透率各向异性要小于低围压下的渗透率各向异性。同时，在相同的围压下，在反复的加载-卸载循环中，渗透率各向异性逐渐减小。验证了CJRM的代表性元素体积（REV）的存在；因此，等效连续介质模型可以用来分析CJRM的渗流特征。