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采用宜昌劈裂砂岩,在有、无砂岩填充条件下,分别从轴压、围压、劈裂面面积、凹凸高差、迹线长度、劈裂面2D投影面积、进出口长度、结构面粗糙度对渗流量的影响规律进行了对比分析。研究结果表明:有、无砂粒填充下轴压与渗流量均呈线性递增关系;无填充时围压与渗流量呈对数递减关系,有充填时围压与渗流量呈线性关系;无充填时渗流量与流面积呈三次函数关系,而充填后过流面积对渗流量几乎无影响;凹凸高差、2D面积与渗流量的关系也有相似规律,分析认为,这主要是砂粒充填后带来的过流通道要远大于上述三因素对过流通道的改变;无充填时,渗流量随迹线长度线性递减,有填充时该规律被淹没;无论有、无填充,渗流量与过流面粗糙度系数在一定范围内均呈现二次函数关系。这些规律能指导渗流测量时各因素的优先次序,可有效减少对次要影响因素的测量工作,同时可对渗流的数值模拟提供参考。
Using Yichang splitting sandstone, with and without sandstone filling conditions, from the axial compression, confining pressure, splitting area, height difference, trace length, splitting 2D projection area, import and export length, rough surface structure Degree of the impact of seepage flow rules were contrastively analyzed. The results show that there is a linear increasing relationship between the axial pressure and the seepage flow under the condition of no sand filling, the relationship between the confining pressure and the seepage flow decreases logarithmically with no filling, and the confining pressure and the seepage flow have a linear relationship with no filling; Seepage flow and flow area showed a cubic function, and the flow area after filling had little effect on the seepage flow; the relationship between the height of uneven surface, the area of 2D and the seepage volume also had similar rules. The analysis showed that this was mainly caused by sand filling The overcurrent channel should be much larger than the above three factors to change the overcurrent channel. When there is no filling, the seepage flux decreases linearly with the length of the trace, and the rule is submerged when there is filling. Degree coefficient in a certain range showed quadratic function. These rules can guide the prioritization of each factor in seepage measurement, which can effectively reduce the measurement of secondary influencing factors and provide references for the numerical simulation of seepage.