破裂岩石非达西渗流的试验研究

为研究破裂岩石非线性渗透规律,研制了一种与MTS815.02岩石力学试验系统配套的附加装置。本文介绍了试验原理与方案、试验系统、数据处理方法及一些试验现象,并给出了破裂岩石渗透率、非达西流β因子与轴向应变的回归关系。研究表明破裂岩石渗透特性的统计指标与轴向应变关系可以用二次多项式拟合,渗透特性的变异系数随轴向应变增大而减小。

TESTING STUDY OF NON-DARCIAN SEEPAGE FLOW IN FRACTURED ROCKS

To investigate the nonlinear behavior of seepage flow in fractured rock, a supplementary device to the MTS815.02 Rock Mechanics Testing System was designed. This paper presents the testing principle and scheme, the testing configuration, the approach to processing the testing data and some test results. Statistical indices of percolation properties of every group of rock specimen are calculated. The regressing relation of k (generalized permeability), β (the β factor of non-Darcian seepage flow) and axial strain of fractured rock is presented. It is concluded that the relation between the statistical indices of percolation properties of fractured rock and axial strain can be expressed by quadratic polynomial, and the variance coefficient of percolation properties decreases as the axial strain increases.