EARLY-AGE STRESS ANALYSIS OF CONCRETE DIAPHRAGM WALL THROUGH TENSILE AND COMPRESSIVE CREEP MODELING

For the early-age stress analysis of a massive concrete diaphragm wall in the underground part of a transport complex hub, this paper presents firstly the stress analysis algorithm considering both tensile and compressive creep behaviors of early-age concrete. Then the in-situ large-scale model test of a diaphragm wall is designed and performed to simulate the sliding and continuous connections between the inner and external layers. Thermal and strain sensors are installed to record the temperature and strain histories inside the model wall. With available mechanical properties and calibrated tensile creep law for the structural concrete, the stress analysis is effectuated on the model wall and the results are validated by the in-situ measurements. Furthermore, the stress analysis is performed on the full scale diaphragm wall. Based on the numerical results, the rational connection option between layers and cracking risk of the diaphragm wall are discussed.