Seismic design optimization and dynamic response analysis of intake tower backfill

In order to analyze the effects of different backfill materials and different backfill thickness on the dynamic response of intake towers, we set up a numerical test model that combined 6 types of backfill materials and 4 types of backfill thickness, and conducted dynamic analysis of the intake tower. When the rock ballast was filled, the maximum stress of the area was greatly reduced, and the stress distribution of the contact surface was changed; the thickness of backfill had little influence on the displacement of the top of the tower. Based on the calculation results and analysis of the numerical test, a new type of backfill was designed with rational use of rock ballast backfill. For this type, the junction between the tower and the backfill was not in the position of the concentrated stress. The maximum stress of the contact surface was greatly reduced, and the stress value of the same area was reduced. The large-stress area shifted downwards, and the area became larger and wider, indicating that the new type improved the stress state of the intake tower structure, and was beneficial to the safety of the intake tower. The proposed method was applied to the structure of a water intake tower in a flood discharging tunnel. Comparison was made between the new and original backfill types in terms of the stress time-history curve of the junction between the intake tower back and backfill, as well as the stress nephogram and damage nephogram of the contact surface between the intake tower back and backfill. The results showed that the dynamic response of the contact surface between the intake tower and backfill was greatly improved by the new type of backfill. This backfill method is of great significance to earthquake resistance and safety of intake tower structures, and can be used as reference for similar projects.

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