跨断层隧道设置常规抗减震措施振动台试验研究

发布时间：2019-05-05 08:29

【摘要】：针对跨断层隧道洞身段设置抗减震措施开展振动台模型试验研究。通过分析围岩与隧道结构的地震加速度响应、地震动应变反应以及隧道结构的震后破坏形态,对设置减震缝、减震层和无抗减震措施3种情况进行对比研究。结果表明:新型滑动装置在单一模型箱内能够较好地模拟断层错动,从而实现对模型系统的非一致性地震激励;断层错动能够引起隧道结构横断面大范围的破坏,因此跨断层的隧道结构必须设置抗减震措施;减震缝可以使隧道结构发生相对变位以降低结构的地震动应变值;减震层材料的缓冲作用可以削弱隧道结构因受围岩约束而产生的受迫振动,从而降低地震动应变值;减震层的减震效果优于减震缝,但是要充分发挥二者的抗减震作用,还需提高衬砌混凝土的强度;拱肩、拱脚和仰拱是隧道结构抗震加固的重点部位。研究结果有利于隧道结构新型抗减震措施的开发,以及为跨断层隧道结构的抗震设防提供参考。
[Abstract]:The shaking table model test is carried out in view of anti-seismic measures set up in the tunnel section of cross-fault tunnel. By analyzing the seismic acceleration response of surrounding rock and tunnel structure, the dynamic strain response of earthquake and the post-earthquake failure pattern of tunnel structure, this paper makes a comparative study on setting up shock absorption joint, shock absorption layer and no anti-shock measures. The results show that the new sliding device can simulate fault dislocation well in a single model box, so that the non-uniform seismic excitation of the model system can be realized. Fault dislocation can cause large-scale damage of cross-section of tunnel structure, so anti-seismic measures must be set up for cross-fault tunnel structure, and shock absorption joint can cause relative displacement of tunnel structure in order to reduce earthquake dynamic strain value of tunnel structure. The buffering effect of shock absorber material can weaken the forced vibration of tunnel structure due to the constraint of surrounding rock, thus reducing the earthquake strain value. The damping effect of the shock-absorbing layer is better than that of the joint, but the strength of the lining concrete needs to be improved in order to give full play to the anti-seismic effect of the two layers, and the abutment, the arch foot and the inverted arch are the key parts of the seismic strengthening of the tunnel structure. The research results are beneficial to the development of new anti-seismic measures for tunnel structures and to provide reference for seismic fortification of cross-fault tunnel structures.
【作者单位】：西南交通大学交通隧道工程教育部重点实验室;
【基金】：国家自然科学基金资助项目(51178398,51078319);国家自然科学基金青年科学基金资助项目(41102220)
【分类号】：U452.28

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