Numerical Simulation of the Diffusion of Fissure Slurry at High Temperature

Abstract

Deep-buried tunnel at high-ground temperature is prone to the sudden surge of water when crossing the water-rich formation, resulting in casualties and economic losses. Slurry injection is a common and effective method of governance for addressing this issue. However, there has been little research into pulping at high-ground temperature, with most of the existing research focusing on room temperature conditions. We studied two kinds of slurry commonly used in grouting, cement slurry and cement-sodium silicate slurry. Indoor testing was used in this paper to clarify the effect of temperature on slurry viscosity, and numerical simulation was used to study slurry diffusion in flat cracks at different temperatures. The results showed that in a hydrostatic environment, the spread rate of slurry was independent of temperature and type of slurry. For the same kind of slurry, the higher the temperature, the greater the maximum slurry pressure. The higher the temperature in a flow environment, the faster the slurry diffusion. As the temperature rised, the grouting pressure required for crack sealing decreased at first then rises. In a flow environment, the sealing effect of cement-sodium silicate slurry was superior to that of cement slurry.

Study on the mechanism and simulation of slurry diffusion in fractured rock mass based on detour effect

“…Liu Zhaoxing et al [7] fluid in the horizontal grouting hole of inclined fracture, and calculated and analyzed the change law of the slurry diffusion trace and diffusion distance of inclined fracture under different factors. In order to solve the problem of water gushing accident when the high-temperature deep-buried tunnel passes through the water-rich stratum, Niu Jiandong et al [8] adopted the method of indoor test and numerical simulation to study the diffusion law of slurry in the fissure at different temperatures.…”