What's the influence of Bentonite on the grouting when the shield construction is stopped?
Stop when the bentonite is used to protect the grouting pipe, a method for the long time stop by, stop after the slurry pipe filled with bentonite, external impurities is not easy with the water back to the slurry pipe clogging, so this is a simple and economical way to protect.
A note about the impact of this technique is that the bentonite slurry must be mixed evenly, also stop too long, always move the pump, is to avoid the bentonite slurry itself or precipitation, dry caking
