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为了研究单裂隙面隙宽分布对浆液渗透的影响,基于多重分数布朗运动(MBM)分形理论构建出4种不同规则维数下的随机隙宽单裂隙几何模型,从而较真实的反应了天然裂隙面隙宽分布的局部渐进自相似性。通过注浆数值模拟研究发现,压力等值线随时间延续呈现曲折扩散形式,反映了其非均匀渗透特征。裂隙面闭合区分布形态随规则维数降低由点状散布趋向面状集中,其空间位置对浆液后期渗透压力和全程注浆时间影响很大;并且随着浆液入渗发展,节点压力由前期的较快单调增长到后期逐步趋于稳定,越靠近入渗边界的节点达到稳定压力所用时间越短。节点压力与注浆时间成幂函数关系,通过曲线拟合给出了不同参数下的经验方程。
In order to study the effect of single-fracture surface width distribution on slurry infiltration, four kinds of single-fracture random fracture geometry models with different regular dimensions are constructed based on the multi-fraction Brownian motion (MBM) fractal theory, which realistically reflects the natural fracture Local Progressive Self Similarity of Surface Gap Width Distribution. Through the numerical simulation of grouting, it is found that the pressure contours show a meandering diffusion form over time, which reflects the non-uniform infiltration characteristics. The distribution of fractured surface closed area decreases with the decrease of regular dimension from point spread to planar concentration, and its spatial location greatly influences the later period osmotic pressure and full grouting time. With the development of slurry infiltration, The rapid monotonous growth tends to be stable gradually in the later period, and the shorter the time required for the nodes closer to the infiltration boundary to reach steady pressure. Nodal pressure and grouting time into a power function relationship, through the curve fitting is given under different parameters of the empirical equation.