نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی دکتری زلزله، دانشکده مهندسی عمران، دانشکدگان فنی دانشگاه تهران، تهران، ایران
2 استاد، دانشکده مهندسی عمران، دانشکدگان فنی دانشگاه تهران، تهران، ایران
3 استادیار، دانشکده مهندسی عمران، دانشکدگان فنی دانشگاه تهران، تهران، ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Earthquakes are among the most significant natural hazards that threaten the safety of critical and sensitive structures, such as nuclear power plants, and can disrupt energy production, leading to irreversible environmental and human consequences. International standards and IAEA guidelines emphasize that the seismic design of nuclear facilities must protect human life and the environment. For heavy, sensitive infrastructure, Deep Soil Mixing (DSM) is recommended to mitigate seismic hazards; this study evaluates its effectiveness in reducing seismic risk for an operational nuclear reactor. The APR1400 reactor was modeled on a multi-layered soil improved by DSM based on laboratory test results. The soil-structure interaction (SSI) and structure-soil-structure interaction (SSSI) were analyzed under unidirectional Ricker wave loading at various frequencies, as well as under unidirectional and bidirectional near-field earthquake records. The results indicated that horizontal acceleration was higher in the internal structure than in the containment building and decreased with increasing excitation frequency; DSM implementation beneath the foundation increased horizontal acceleration, with a more pronounced effect in the internal structure. Analysis of vertical acceleration revealed that the containment building, due to its location at the edge of the foundation, experienced higher vertical acceleration, and DSM-enhanced rocking motion further increased it. The effect of DSM on the internal structure was frequency-dependent. Bidirectional loading had a negligible impact on horizontal acceleration but significantly increased the Fourier amplitude and energy of vertical acceleration. Overall, SSSI reduced horizontal acceleration, but the presence of a second structure at 50 m locally reduced horizontal acceleration while increasing vertical acceleration. These findings highlight the importance of 3D modeling, application of near-field seismic records, and careful consideration of SSSI and inter-structure spacing for mitigating seismic hazards, protecting human life and the environment, and designing safe nuclear facilities with sensitive equipment and high-frequency content.
کلیدواژهها [English]