Study of Electrical Properties and Microstructure of Cement-Based Graphite Grouting Materials

With the further increase in investment in construction projects in western mountainous areas by the country, century long projects such as the Sichuan-Tibet Railway and Yunnan-Tibet Railway traversing complex mountainous terrains, leading to frequent geological disasters such as mudflows and water inrushes caused by complex geological environments. Grouting, as an effective means, is widely used, and the evaluation of grouting effectiveness remains a significant challenge. This study used graphite powder to prepare conductive cement-based grouting materials. By observing the changes in electrical properties and microporous structure of six types of cement-based grouting materials under different ratios of graphite content, the relationship between macroscopic electrical properties and microstructure of grouting materials was established, and grouting evaluation was achieved. The results indicate that with the increase of graphite content, the electrical resistivity of the six types of cement-based slurries decreases, polarization increases, average pore size increases, porosity increases, and permeability enhances. Under the guidance of macroscopic electrical characteristics, cement-based grouting materials with varying graphite contents can be selected according to the physical characteristics of surrounding rock in underground engineering to achieve monitoring and effectiveness testing of the disaster grouting treatment process.