Abstract
The demand for the diaphragm wall to use as a permanent structure has increased due to its durability and water tightness. However, there has not been enough a study on the thermal crack control of the diaphragm wall for the heat hydration.
This paper proposes the simplified method to evaluate the thermal crack on the diaphragm walls. This method based upon the studies on the ground restraint and several factors influencing the degree of restraint and equivalent temperature drop of the diaphragm wall. It is shown that when thermal crack index is over 1.5, the thermal crack density that is crack length of unit area of element, is small. The thermal crack index is applicable to the evaluating method of thermal crack on diaphragm wall. The result verified the method has relatively well accuracy in the evaluation.
