高烈度地震区黏滑断层隧道减震层减震模型试验研究
Model tests on damping of shock absorption layer of stick-slip fracture tunnel in highly seismic areas
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摘要: 为提高高烈度地震区黏滑断层隧道的抗震性能,依托都汶高速龙溪隧道F8黏滑断层段,开展了不同厚度减震层的大型静力断层黏滑错动试验和强震震动动力试验,对强震作用下黏滑断层隧道减震层减震技术进行研究。研究结果表明:强震作用下断层黏滑错动对隧道上盘部分的影响程度及影响范围均大于下盘部分,隧道上盘部分是抗震设防设计的重点段落;隧道设置10 cm减震层的减震效果明显优于隧道设置5 cm减震层和15 cm减震层的减震效果,推荐布设厚度为10 cm的减震层。研究成果对提高高烈度艰险山区穿越黏滑断层隧道的抗震性能提供了技术支撑。Abstract: To improve the anti-seismic performance of tunnels in highly seismic areas with stick-slip fracture, the strong earthquake vibration dynamic tests on the damping layer of large static bond-slip with different thicknesses are performed based on the section of F8 stick-slip fracture in Longxi tunnel of Dujiangyan-Wenchun expressway under earthquake action. The shock absorption technology is used for the damping layer. The results show that under the action of earthquake, the fault rupture dislocation has greater influence scope and degree on the upper part of the tunnel than on the lower part of the tunnel. The plate part is the focus of the earthquake resistance design. The damping effects of 10 cm thick-shock absorption layer of the tunnel are obviously better than those of 5 cm thick and 15 cm thick shock absorption layers. The 10 cm thick shock absorption layer is thus recommended. The research results may provide the technical support for improving the anti-seismic performance of tunnels across dangerous mountains with stick-slip fracture.