Application of horizontal grouting method in receipt well of shield-driven tunnel

Taking the reinforced engineering of receipt well in cement-water balance type shield-driven tunnel as an example, the paper researches the reinforcement technology for the soil around the receipt well. By comparing and different reinforcement schemes, such as surface vertical grouting, high-pressure rotary jet grouting, and horizontal grouting, etc, the reinforcement process of horizontal grouting was selected. The plane arrangement of grouting location was determined and optimized according to actual geological condition, process in well wall bore and buried borehole orifice-pipe, method of grouting orifice pipe and grouting process and parameters, etc. Grouting consolidation situation was checked out through preserved bores of well wall. Results showed that this method had a sound project effectiveness, preventing the water burst, sand gushing, back flushing, etc, which can provide protection to the operation of subsequent shield machines. Practices prove that the horizontal grouting method can shorten the construction time, have better operability and grouting ability for sand and gravel layer, and have improved the success rate of formation consolidation.