劈裂砂岩有、无砂粒填充条件下的多因素对渗流量影响对比分析

发布时间：2019-06-29 12:29

【摘要】：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。
[Abstract]:Using Yichang split sandstone, the effects of axial pressure, confining pressure, split surface area, concave and convex height difference, trace length, 2D projection area of split surface, inlet and outlet length and roughness of structural plane on seepage flow rate are compared and analyzed under the condition of sandstone filling and no sandstone filling. The influence of axial pressure, confining pressure, split surface area, concave and convex height difference, trace length, split surface 2D projection area, inlet and outlet length and structural surface roughness on seepage flow is compared and analyzed. The results show that there is a linear increasing relationship between axial pressure and seepage flow without sand filling, a logarithmic decreasing relationship between confining pressure and seepage flow without filling, a linear relationship between confining pressure and seepage flow without filling, and a cubic functional relationship between seepage flow and flow area without filling, while the overflowing area after filling has little effect on seepage flow. The relationship between concave and convex height difference, 2D area and seepage flow rate is similar. It is considered that the overflow channel caused by sand filling is much larger than the change of the flow channel caused by the above three factors; when there is no filling, the seepage flow decreases linearly with the length of the trace line, and the law is submerged when there is filling; whether there is, no filling, the seepage flow rate and the roughness coefficient of the flow surface show a quadratic function relationship in a certain range. These laws can guide the priority of each factor in seepage measurement, effectively reduce the measurement of secondary influencing factors, and provide a reference for the numerical simulation of seepage.
【作者单位】：三峡大学三峡库区地质灾害教育部重点实验室;
【基金】：国家重点基础研究发展计划(973)(No.2012CB426502) 国家自然科学基金资助项目(No.51279091) 中国水利水电科学研究院流域水循环模拟与调控国家重点实验室开放研究基金项目(No.IWHR-SKL-2012221) 宜昌市科学技术研究与开发项目(No.A2012-302-03)
【分类号】：TU45

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