不同压实度花岗岩残积土的渗流模拟

以桂东南地区不同压实度的花岗岩残积土为研究对象,结合显微CT(micro computed tomography,微计算机断层扫描技术)扫描试验与Avizo软件中先进的数字图像处理技术提取孔隙网络模型.然后基于流体力学的传统方法(computational fluid dynamics,CFD),将孔隙结构的数字岩心模...

Seepage Simulation Of Granite Residual Soil With Different Compaction Degrees

Taking the granite residual soil with different compaction degrees in Southeast Guangxi as the research object, the pore space structure model was extracted by combining the micro-CT scanning test and the advanced digital image processing technology in the AVIZO software. Then, based on the traditional method of fluid mechanics (CFD), the model was imported into COMSOL to simulate the seepage at the micro-scale, and the seepage characteristics of water in the pores of granite residual soil with different compaction degrees were studied from the microscopic point of view, and compared with the measured permeability to test the pore Accuracy and representativeness of the spatial structure model. The research results show that during the seepage process of granite residual soil, the maximum velocity appears in the pore center area with good connectivity, and far exceeds other parts, along the direction of the pore center to the outer wall, the seepage velocity gradually decreases; in areas with poor connectivity, the flow rate is almost zero. As the degree of compaction increases, the pore connectivity of the granite residual soil deteriorates, the pore structure of each section changes, and the average seepage velocity of each section gradually decreases, which shows that the degree of compaction affects the seepage characteristics of the granite residual soil Have an important impact. The simulated values of average permeability of granite residual soil with compaction degrees of 90%, 100%, and 110% are 1.35, 0.9, and 0.77 times of the measured values, respectively. Pore seepage characteristics of compacted granite residual soils can be accurately modeled by the spatial structure model.