破碎泥岩渗透特性试验研究

流体在破碎泥岩中的渗透是影响保水开采和预防采空区灾害的重要因素之一,且其力学行为表现为应力场、渗流场、裂隙场多场相互作用的流-固耦合特征.利用研发的渗透试验装置,在DDL600电子万能试验机上进行了破碎泥岩压实过程中的渗透特性测定,并分析了有效应力与渗流速度关系、不同粒径泥岩在不同孔隙度下的渗透率和非Darcy流β因子.研究表明,流体在破碎泥岩中的渗流呈现非Darcy流特性,随渗流速度增加,压力梯度减小的幅度增加;渗流速度随液体压力增加而增大,且有效应力与渗流速度曲线可用线性关系式拟合;不同粒径的泥岩,随孔隙度增大,渗透率呈现不同的变化趋势,其渗流的非Darcy流β因子随孔隙度增大呈现减小趋势,粒径越小,减小趋势越明显.

Experimental study on permeability characteristics of broken mudstone

Fluid seepage in fractured mudstone is one of the important factors of affecting the water exploitation and goaf disaster prevention,and its mechanical behavior is the stress field,seepage field and crack interaction of many games of fluid-solid coupling characteristics.Using of research and development of permeability test device,the fractured mudstone compaction infiltration characteristics in the process of determination were completed,In DDL600 electronic universal testing machine.The relation between the effective stress and seepage velocity,the porosity permeability and non Darcy flow factors of different particle size of mudstone were analyzed.The research shows that：the penetration of fractured mudstone presents the characteristics of non Darcy flow ; with the increase of flow velocity,the magnitude of pressure gradient decreases is increasing; along with the increase of the liquid pressure,seepage velocity increases,and the linear relation can be fitted with the curve of effective stress and seepage velocity; with the change of porosity size,permeability presents a changeable trend ; the non-Darcy flow factor of mudstone-particle size shows a decrease trend with the increase of porosity,the smaller the particle size is,the more obvious the decreasing trend is.