(1. School of Civil Engineering, Shandong University, Jinan, Shandong 250061, China; 2. College of Pipeline and Civil Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, China; 3. School of Civil Engineering, Shandong
Jianzhu University, Jinan, Shandong 250101, China; 4. School of Transportation and Civil Engineering,
Shandong Jiaotong University, Jinan, Shandong 250357, China)
Abstract：The diffusion of quick-setting grout in high-temperature fissured rock mass involves the process of grout filling rock fissures, accompanied by the fluid-solid phase transition of the grout and heat transfer between the grout and the surrounding rock. Based on this understanding, a breakthrough diffusion model for grouting has been developed. A modified calculation method for the rheological parameters of quick-setting grout, considering the combined effects of heat transfer and fluid-solid phase transition, has been proposed. Additionally, stepwise algorithms for the initial circular diffusion stage and the breakthrough diffusion stage have been formulated. To validate the reliability of the breakthrough diffusion model, simulation tests were conducted on the grouting diffusion process within a single horizontal fissure under high-temperature and water-saturated conditions. The analysis of the breakthrough diffusion mechanism of quick-setting grout in high-temperature rock fissures was performed, focusing on the spatial-temporal distributions of grout temperature, rheological parameters, and grout pressure, as well as the impact of surrounding rock temperature on the fissure grouting diffusion process. Results indicate that the stage characteristics observed in the grouting simulation tests were consistent with theoretical predictions. The experimental end times for the circular and breakthrough diffusion stages deviated from theoretical values by less than 15%, while the theoretical errors in grout pressure and temperature remained within 10%, thus confirming the reliability of the breakthrough diffusion model. Theoretical findings revealed that as the temperature of the surrounding rock increased from 20 ℃ to 80 ℃, the end time of the fluid-solid phase transition of the grout was reduced by over 50%. Furthermore, the peak yield stress of the grout decreased by more than 20%, and the peak viscosity diminished by over 50%. During the circular diffusion stage and each breakthrough diffusion stage, the spatial distributions of grout temperature, rheological parameters, and grout pressure along the flow path exhibited periodic characteristics. Specifically, the grout temperature, rheological parameters, and grout pressure corresponding to each diffusion stage displayed approximately linear, downward-convex, and upward-convex spatial distributions, respectively. The length of the flow path demonstrated a positive correlation with the surrounding rock temperature. However, the relationship between grout pressure and temperature exhibited a certain degree of complexity, as an increase in the surrounding rock temperature did not result in a significant increase in grout pressure.
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2025, Vol. 44 
