Application of High-pressure Spiral Jet Grouting Piles in Shield Tunnel Portal Soil Reinforcement Engineering

Abstract:

When the shield launching or arrival is under construction in the shield tunnel, it becomes the key to keep the soil stability in a period of the time before the rotary cutter head of shield machine penetrating into or drilling through the stratum. Based on the engineering case, this paper discussed the application of dual pipe highpressure spiral jet grouting piles in shield tunnel portal soil reinforcement about the principle of highpressure grouting, the grouting parameters and the construction technology. And some suggestions are put forward for spiral jet pile reinforcement and construction issues on shield launching or arrival.