Experimental Study on Diffusion Characteristics of WIS New Grouting Material in Tunnel Karst Conduit
In order to explore the diffusion law of WIS new grouting material in tunnel karst conduit,a visualized simulation system for grouting in karst straight conduit was built based on the characteristics of water inflow in tunnel karst conduit.Orthogonal experiments were conducted to study the influence of pipe diameter,water flow velocity,and grouting rate on the diffusion and plugging distance of slurry under dynamic water grouting for three particle sizes of WIS new grouting material.The mechanism of slurry diffusion law under different slurry/water rate ratios(θ)was proposed.Typical conditions were selected to discuss the characteristics of grouting plugging body,and the dynamic evolution characteristics of multiple physical fields such as pressure field and velocity field during grouting diffusion process were compared and analyzed.The results show that the dynamic water flow velocity is the main external con-trol factor affecting the diffusion and plugging distance of slurry.The plugging distance of slurry diffusion along the water flow direction within the effective diffusion range is negatively correlated with the slurry/water rate ratio θ.During the grouting diffusion process,the attenuation rate of dynamic water flow velocity and the rate of pressure in-crease show a slow-fast trend until plugging is achieved.Before the slurry is fully plugged,the dynamic water flow velocity decreases first and then increases,while the pressure increases first and then decreases.
Karst conduitWIS new grouting materialDynamic water groutingOrthogonal experimentsDiffusion law
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