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以重庆梁-忠(梁平县-忠县)高速公路礼让隧道为工程研究背景,通过测线法调查现场节理,获得了节理产状分布概率密度函数,并从分形几何学的角度分析了节理间距及迹长的分形分布规律,推导出能反映节理间距及迹长分布状态的分形维数D及分形分布概率密度函数。在该基础上采用Matlab软件以及Monte-Carlo随机分析方法,产生节理参数随机数,结合3DEC中最新模块离散裂隙网络(DFN)技术,建立了能反映节理裂隙分布特征的离散裂隙网络模型并验证了模型的有效性,结果表明,分形分布比负指数分布包含更多的间距、迹长分布信息,更接近于实际分布;分形维数D反映了节理间距、迹长在其变化范围内的分布特征,分形维数的大小取决于小间距、小迹长部分数量在总节理数量中的比例,为节理裂隙岩体网络模型构建提供了一种新方法。
Taking the Li-Zhong (Liangping-Zhongxian) highway etiquette tunnel in Chongqing as an engineering research background, the probability density function of the joint shape distribution was obtained through field survey by means of the survey line method. From the point of fractal geometry, And the fractal distribution rule of the trace length, the fractal dimension D and the probability density function of the fractal distribution which can reflect the distribution of the pitch and the track length are derived. On this basis, Matlab software and Monte-Carlo stochastic analysis method are used to generate the joint parameter random numbers. Based on the latest discrete discrete mesh network (DFN) technology in 3DEC, a discrete fracture network model reflecting the distribution of joint cracks is established and verified The results show that the fractal distribution contains more interval and trace length distribution information than the exponential distribution, which is closer to the actual distribution. The fractal dimension D reflects the distribution characteristics of the joint spacing and trace length in its variation range The fractal dimension depends on the small spacing and the ratio of the small trace length to the total number of joints, which provides a new method for constructing the network model of jointed rock mass.