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为探讨黏土矿物对砂岩变形的响应特征,开展了富含黏土砂岩的渗透率随应力变化的研究。基于渗透率有效应力系数ESCK的含义,分析发现ESCK是岩石变形的响应特征参数,在前人研究的基础上建立了ESCK与岩石变形之间的关系,初步提出了一套新型的岩石变形特征诊断方法。选取两块富含黏土砂岩在3种不同的围压下分别加/卸载孔隙流体压力,根据稳态法原理实测每种试验条件下的岩芯渗透率,同时根据所提出的平移法计算ESCK,结果表明,ESCK是大于1.0的常数,平移法是计算ESCK的有效方法。此外,根据所提出的岩石变形特征诊断方法分析判断了31块岩石的变形特征,发现黏土矿物含量和类型以及岩石的微观孔隙结构是影响岩石变形特征的主要因素。
In order to investigate the response characteristics of clay minerals to the deformation of sandstone, the permeability change with clay-rich sandstone was investigated. Based on the meaning of the effective stress coefficient of permeability (ESCK), it is found that ESCK is the response parameter of rock deformation. Based on the previous studies, the relationship between ESCK and rock deformation is established and a new set of characteristics of rock deformation diagnosis method. Two clay-rich clay sandstones were selected to add / unload the pore fluid pressure under the three kinds of confining pressures respectively. The permeability of the core under each test condition was measured according to the steady state principle. Meanwhile, the ESCK was calculated according to the proposed translation method, The results show that ESCK is a constant greater than 1.0, translation method is an effective method to calculate ESCK. In addition, the deformation characteristics of 31 rocks are analyzed and judged according to the proposed method of rock deformation diagnosis. It is found that the content and type of clay minerals and the micro-pore structure of rock are the main factors affecting the deformation characteristics of rock.