随着国家在西部山区工程建设投入的进一步增加,川藏铁路、滇藏铁路等世纪工程穿越横断山脉,复杂地质环境造成的突泥、涌水等灾害频发,注浆作为一种有效手段被广泛应用,如何评价注浆效果成为关键。本研究采用石墨粉制备导电水泥基注浆材料,通过观察六种类型水泥基注浆材料在不同配比石墨掺量情况下电学性能和微孔隙结构的变化,建立注浆材料宏观电性和微观结构关系,进而实现注浆评价。结果表明:随着石墨掺量的增加,6种类型水泥基浆材的电阻率降低、极化率增加、平均孔径增加、孔隙率增加、渗透性增强;在宏观电性特征指导下可以根据地下工程围岩物性特点,选择不同掺量石墨的水泥基注浆材料实现灾害注浆处置过程的监测和效果检测。
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.
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