Risk Assessment in Soil Retaining System Construction

Diaphragm walls (slurry trenches) is more needed nowadays in urban areas and crowded cities where underground constructions as subways, deep basements and utilities as pump stations, underground tanks and tunnels mainly depending on drilling methodology using slurry trenches. Many researchers and different codes of buildings have discussed the risk issues related to design analysis or materials but hardly find scientific researches discussing quality control on site during construction process and its effect on the overall quality of the work needed. Some of these issues is geometrical imperfections such as the positioning error of drilling rigs during trenching, small seepage passages through the diaphragm wall may occasionally occur, which will undermine its water-tightness and lead to significant leakages. This study focus on examination of penetration of seepage passages and it further quantitatively estimates the flow rate through the diaphragm wall under certain circumstances.