破碎岩体注浆加固的二维分形平面模型构建与模拟分析

模拟注浆加固过程中注浆液在破碎岩体中的扩散特性时,构建与现场实际破碎岩体一致的几何模型对 模拟结果的准确性至关重要。 为构建与工程现场破碎岩体一致的几何模型,对于破碎岩体的注浆加固问题,提出了 一个构建破碎岩体二维平面模型的新方法。 首先,通过对破碎岩体的压水实验获得破碎岩体的透水系数;再根据裂 隙岩体的分形特征,运用透水系数计算破碎岩体的分形维数;最后根据分形维数确定最大和最小裂隙构建破碎岩体 的平面二维几何模型,并结合压水实验和数值模拟分析模型的可靠性。 结果表明:通过对分形维数所构建的平面几 何模型的数值模拟,对比分析数值模拟结果与现场压水试验结果,该方法能够获得与现场破碎岩体状况一致的二维 平面几何模型,为模拟分析破碎岩体的注浆加固提供可靠的参考。

The Modeling and Simulation Analysis of Two-dimensional Fractal Plane Model for Grouting Reinforcement of Broken Rock Mass

Simulating the diffusion characteristics of grouting slurry in broken rock mass,it is very important to build a geometric model consistent with the actual broken rock mass. Therefore,in the grouting reinforcement of broken rock mass,to build a geometric model consistent with the broken rock mass in the project site,a new method is proposed to build a twodimensional plane model of broken rock mass. At first,the permeability coefficient of the broken rock mass through the water pressure experiment is obtained. Then,according to the fractal characteristics of broken rock mass,the fractal dimension of broken rock mass is calculated by using permeability coefficient. Finally,according to the fractal dimension,the maximum and minimum fractures are determined to build the plane two-dimensional geometric model of broken rock mass. The reliability of the model is verified by combining the water pressure experiment and numerical simulation. The results show that through the numerical simulation analysis of the plane geometry model constructed by fractal dimension,and comparing the numerical simulation results with the field water pressure test results,the current method can build a two-dimensional plane geometry model consistent with the field broken rock mass condition,which provides a reliable reference for the simulation analysis of grouting reinforcement of broken rock mass.