应力对裂隙岩体渗流影响的研究

The Effects of Stresses on the Permeability of Fractured Rock Masses

研究了应力变化对裂隙岩体渗流特征的影响。假设裂隙网络由等效隙宽相等的相互平行的一组裂隙组成，由于应力变化而导致的隙宽变化控制了裂隙岩体渗流的变化，据此得出了裂隙岩体渗透系数及渗流量与应力的关系式。通过裂隙岩体渗流试验，证实了关系式的正确性。利用此关系式及有限元方法计算，得出了裂隙岩体渗透系数随应力的变化值。

The effects of changes of stresses on the hydraulic conductivity in fractured rock masses are studied.The fractured medium is approximated as an equivalent fracture network in which a single fracture is idealized as a planar opening having a constant equivalent aperture, changes in fracture aperture due to the changes of stresses control a change of hydraulic conductivity.Some models are presented to study the relationship between stresses and hydraulic conductivity.Experimental results are given to illustrate that hydraulic conductivity and water flow depend upon the applied stresses strongly.Through the finite element model and using formulas given in this paper the changes of hydraulic conductivity in a mining face are examined.