Behavior of High-Rise Structures near Deep Excavations in Near-Fault Regions
Narmin Heydari, Arash Mousavi
Due to ever-increasing population, the need for construction is increasing, and construction is feasible if civil infrastructures are expended. On the other hand, the lack of desirable lands (where soil has suitable mechanical properties for construction) in densely populated cities, as well as the high cost of land in some areas, have led to the constructions to be taken place at depths below ground level. Obviously, to prevent possible accidents, excavations must be stabilized. On the other hand, deep excavations are often carried out for high-rise structures. In a city, the high-rise structures are also usually built besides each other. Therefore, excavations cause some problems for high-rise structures near them. These problems can be exacerbated during an earthquake. Since near-field earthquakes have greater and more different effects on the structures than far-field earthquakes, they can be very dangerous for high-rise structures near deep excavations and put them in critical conditions. In present study, three 20-, 25- and 30-storey structures at three distances of 20, 40 and 50 meters from the excavation are studied by applying near-field earthquake in order to analyze the seismic behavior of high-rise structures next to deep excavations. The results show that as the structure height increases and the distance between the structure and the excavation edge decreases, the probability of excavation collapse and the risk for high-rise structures increase.