基于Abaqus软件64CPU显式并行计算集群平台，以南京地铁4号线鼓楼站附近的地下建筑结构为背景，建立了深软地基土–地铁隧道-人防地下室耦合的三维精细化非线性地震反应分析的有限元模型，数值模拟了其在近场汶川大地震清平波、远场大地震Mexico波和100a超越概率3%的南京人工地震波作用下的地震反应。结果表明：“五心圆形”隧道拱肩及拱腰圆弧连接处附近的损伤值最大，塑性变形的产生导致结构相对位移曲线出现突变；人防地下室的顶底板、侧墙顶底部，尤其转弯处损伤程度最严重，其余部位则较为安全；人防地下室的相对位移曲线光滑，沿高度单调增加；相比隧道，虽然人防地下室局部区域的损伤值略大，但相对位移较小；人防地下室导致隧道的局部区域损伤值略有增大而相对位移大范围明显减小；隧道对人防地下室的影响无明显规律。
Abstract
Based on the software ABAQUS 64 CPU explicit parallel computing cluster platform, taking underground structures near Nanjing metro line 4 drum tower station as the background, a 3D refined finite element model was built for a deep soft soil-subway tunnel-civil air defense basement coupled system to numerically simulate its seismic responses underexcitations of near-field Wenchuang earthquake Qingping wave, far-field Mexico one and Nanjing artificial seismic one with the exceedance probability of 3% within 100 years, respectively. The results showed that the damage value of the place near “penta-centric circle” tunnel’s spandrel and haunch arc joint is the maximum, plastic deformation produced causes sudden changes to appear on the structural relative displacement curve; the damage level is the most serious at roof and floor of basement, top and bottom of side wall, especially, basement turning place, the rest places are safer; the relative displacement curve of civil air defense basement is smooth and it monotonically rises along the height; compared with the tunnel, though damage values of civil air defense basement’s local areas are slightly larger, their relative displacements are smaller; civil air defense basement causes damage values of tunnel’s local areas to slightly increase while the range of large relative displacement obviously decreases; the influence of tunnel on civil air defense basement has no obvious law.
关键词
地铁隧道 /
人防地下室 /
相互作用 /
地震反应
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Key words
subway tunnel /
antiaircraft basement /
interaction /
seismic response
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