不同泥质含量砂岩三轴渗透试验研究

发布时间：2018-02-02 07:51

本文关键词： 砂岩泥质含量三轴渗透模型　出处：《水文地质工程地质》2017年01期 　论文类型：期刊论文

【摘要】：为探讨三向应力状态下不同泥质胶结物含量砂岩渗透力学性能的异同,对泥质含量分别为4%、15%、24%、31%的4组不同泥质含量砂岩进行了三轴压缩渗透试验。试验结果表明:砂岩的强度和弹性模量随着泥质胶结物的增加呈幂函数型减小,随围压的升高而增大,内摩擦角和黏聚力随含泥量增加而逐渐减小;相同围压和泥质含量下,渗透性随加载应力的增大呈先减小后增大、再略微减小的整体趋势,渗透系数在峰值应力附近达到最大值;相同围压和偏应力下,渗透系数随泥质胶结物含量的升高而呈线性减小;同等泥质含量和偏应力下,砂岩的渗透性随围压的升高呈对数型函数减小。基于试验结果,分析得到了一种综合考虑围压、孔隙度以及泥质含量影响的砂岩综合渗透模型,并通过理论与试验数据对比分析验证了模型的合理性。
[Abstract]:In order to study the similarities and differences of permeability mechanical properties of sandstone with different muddy cementation content under three direction stress state, the content of clay is 4 15% or 24% respectively. Four groups of sandstone with different shaly content in 31% were tested under triaxial compression. The results show that the strength and elastic modulus of sandstone decrease with the increase of shale cement. With the increase of confining pressure, the internal friction angle and cohesion force decrease with the increase of mud content. Under the same confining pressure and mud content, the permeability decreases first and then increases with the increase of loading stress, and then decreases slightly. The permeability coefficient reaches the maximum near the peak stress. Under the same confining pressure and deflection stress, the permeability coefficient decreases linearly with the increase of the content of clay cement. Under the same shaly content and deviation stress, the permeability of sandstone decreases with the increase of confining pressure in logarithmic form. Based on the test results, a comprehensive consideration of confining pressure is obtained. The comprehensive permeability model of sandstone affected by porosity and shaly content is verified by comparison of theoretical and experimental data.
【作者单位】：重庆水利电力职业技术学院;
【基金】：国家自然科学基金项目资助(51378521) 重庆市科委重点基金项目资助(CSTC2013JJB0005)
【分类号】：TU45
【正文快照】： 砂岩是现代水利、交通、矿井、油气探井等工程中最为常见的一种岩石之一,而渗透特性对工程的安全和稳定具有重要影响,因此砂岩的渗透性能历来受到众多专家学者的关注和研究。张守良等[1]、郭琴等[2]研究了砂岩、泥岩等变形破坏过程中渗透率随荷载的变化规律,并对其影响因素进

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