摘要
本文提出用Monte—Carlo模拟方法来研究岩体的渗流场,包括:(1)裂隙的几何概率模型;(2)用Monte—Carlo法生成随机裂隙网;(3)模拟岩体的有限元分析,这实际上是一种在计算机上进行的渗流试验。 为研究各种特征参数的影响,进行了各种组合“试验”。计算机上的试验表明,随着裂隙密度的增大透水性也增大,同时,渗透系数的分散性相应降低,透水性愈来愈均匀;小密度时,渗透椭圆极不规则,这时尺寸改变,渗流体特性的变化很大,甚至不存在代表单位元体,如果仍然用连续体力学方法来分析裂隙岩基渗流状态,与实际可能出入很大。 文中指出,只要通过地质勘探,取得有关裂隙系统的几何特征,就可用本文的方法进行大量“试验”,而花费远小于现场试验。另外,用本文介绍方法还可对现场勘探工作进行指导。
In this paper,a numerical method is presented to study the seepage flow in rock mass.The method consists of :(1)probabilistic modelling of fracture geometry; (2)generation of random fracture network by Monte-Carlo simulation.(3)finite element analysis of simulated rock blocks.To investigate the effect of geometrical parameters on seepage flow, various combinations of 《Tests》 are performed on electrical computer. The results show that(1)with increasing fracture density the permeability is increased and becomes more homogeneous; (2)when density is low, permeability ellipse is rather irregular; (3)At low density permeability is sensitive to block size.So application of the continuum conceptualization to the analysis of seepage flow in fractured rocks would cause considerable discrepancy with objective reality.It is pointed out that a large number of tests can be performed by using described method in this paper provided that geometrical properties of fracture system involved are obtained through geological exploration,and the technique is rather cheaper than performing the same number of field tests.
出处
《长江科学院院报》
CSCD
北大核心
1989年第3期68-74,共7页
Journal of Changjiang River Scientific Research Institute
