饱和含水石灰岩散体蠕变过程中孔隙度变化规律的试验

Experimental on the porosity changing of water-saturated granular limestone during its creep

利用一种破碎岩石渗透特性试验系统进行了饱和含水状态下石灰岩散体的蠕变试验.通过回归分析得到了蠕变过程中孔隙度的变化率与当前孔隙度、应力水平之间的关系.研究表明:在恒定应力水平下,孔隙度的变化率与当前孔隙度之间可用三次多项式拟合;在不同应力水平下,多项式系数取决于轴向应力与岩芯单轴抗压强度的比值,并且可用该比值的幂函数拟合.

A test system determining the seepage properties of over-broken rock was used to carry out the creep test for water-saturated granular limestone. By regression, the relationship between the changing rating of the porosity and the current porosity and the stress level during the creep was obtained. This study indicated that when the stress remains a constant level, the changing rating of the porosity can be fitted as a cubical parabola of current porosity; the coefficients of the polynomial depend on the ratios of the axial stress over to the uniaxial compression strength of the rock, and can be expressed as functions of the ratios mentioned above.