软岩的伺服渗透试验研究
The Servo Penetration Test Research of Soft Rock
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摘要: 根据伺服渗透试验获得的应力-应变和渗透率-应变关系曲线，分析了全应力-应变过程中软岩的渗透性随变形的变化特点，得出全应力-应变过程中岩样渗透率可划分为5个阶段；结合软岩的应力与渗透率关联性拟合曲线可以得出：软岩渗透率具有滞后性，即渗透率的峰值往往在应力的峰值之后；通过多项式和指数函数方程对软岩的应力与渗透率关联性进行回归分析可以看出，2种函数方程拟合的曲线相关系数都接近于1，表明相关性较好，且用多项式拟合的相关系数要比用指数函数拟合的高，表明用多项式拟合的效果比指数函数更好，但多项式的数学表达式却相对比较复杂。Abstract: According to the stress-strain and permeability-strain curves which obtained from the servo penetration test, it analyzed the change characteristics of soft rock permeability with deformation in the process of whole stress and strain, it was concluded that the permeability of samples could be divided into five stages in the process of whole stress and strain. Combined with the fitting curves of soft rock relevance between stress and permeability, it obtained that soft rock permeability had the characteristic of hysteresis, namely the peak of permeability often appeared after the peak of stress. Through the regression analysis which used polynomial and index function equation to study soft rock correlation of stress and permeability, it was concluded that two kinds of function equation fitting correlation was good, and the effect of polynomial fitting was better than the one of index function fitting, but polynomial mathematical expression was relatively complicated.
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Keywords:
- stress /
- strain /
- permeability /
- soft rock /
- servo penetration
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