岩体总是赋存于一定的渗流场和应力场中的，在裂隙岩体中开挖洞室将打破最初的平衡状态 , 引起渗流场和应力场发生变化，因此研究地应力场对渗流场的影响具有重要的意义。采用 UDEC 程序 , 利用数值试验的方法 , 研究了块体边界尺寸以及初始地应力对在节理裂隙岩体中开挖洞室引起隧洞内涌水量变化的影响。结果表明，随着块体边界尺寸和初始应力比的增加，开挖后隧洞内的涌水量均减小。

The geostress field and seepage field always exist in rock mass, the cavity excavation in the fractured rock mass will disturb the initial equilibrium and cause the change of geostress and seepage, so it is important to study the effect of geostress on the permeability of rock mass. The effect of rock block boundary size and initial geostress on the change of blowing discharge in the excavated cavity or tunnel is studied quantitatively by a numerical test. It is found that with the increase of block size and the ratio of initial horizontal stress to vertical stress, the blowing discharge in the excavated tunnel will be decreased. 