抄録
The construction control has been recently recognized as one of the most important matters in a series of design procedures of the earth works such as embankment and excavation in which the small safety factor is generally adopted since the modification of design is comparatively easy during the works. The small safety factor means the severe conditions in the construction field, therefore the good method to evaluate the present degree of safety and to predict the successive failure is needed indispensably in order to control the works well and to take the appropriate countermeasures immediately if necessary. In connection with the problem of the large-sized excavation, this paper describes the study to find the method predicting the failure during the works. The items to be measured in a field and the reasons for them are firstly discussed and the valid prediction method of using values of the lateral displacement of the earth retainning structure and the earth pressure on it at the bottom of excavation is shown. After that, how to utilize the measured results in engineering practice is examined and the diagrams for construction control are proposed, in which many actual data in the recent construction fields of the large-sized excavation in Japan were used.
