Grouting well supplement

This topic examines the quality and safety requirements of borehole wall grouting. The grouting pressure at the grouting point should be controlled within the maximum grouting pressure allowed by the boundary conditions. So option b is wrong. In the shaft section located in quicksand layer, when the shaft adopts double-wall support, the grouting hole should pass through the inner wall and enter the outer wall100 mm. Therefore, option D is wrong.