Q. What do by Diaphragm wall?
For the construction of diaphragm walls adjacent to buildings, former experience showed that excess slurry head above groundwater level had to be maintained to limit the ground settlements at the time of the construction of diaphragm walls. Actually the excess slurry head can be achieved by the subsequent methods. The first one is to construct a ring of well points to lower the piezometric level to achieve a higher excess slurry head in diaphragm walls. Otherwise guide walls may be raised above ground level to accommodate the slurry column.