A Study on the Stability of Anchored Retention Walls for Underground Excavation

When deep excavations are performed in urban areas, sufficient investigation should be prepared for the stability of excavated ground and the influence on adjacent structures. Especially, the excessive deformation of retention walls, which causes ground settlement at behind ground of the walls, may induce a considerable danger on the stability of adjacent structures and excavation construction. Recently, for prevention of construction disaster and safe construction of retention walls, construction management based on the field measuring has been increased. However, since available judgement criteria are not prepared, it is difficult to make correct judgement on the field measuring results. The purpose of this paper is to establish a quantitative criterion which can be applied on judgement of the stability in deep excavation according to the condition of construction of anchored retention walls. It was possible to evaluate the quality of construction management by investigating the relations between lateral earth pressure acting on the retention walls and horizontal displacement of the walls. And also quantitative safe criterion to judge stability of retention walls was established from the relations between horizontal displacement measured by inclinometer installed behind retention walls and excavation depth as well.