浅埋偏压小净距隧道大型振动台实验研究

发布时间：2018-01-06 09:21

本文关键词：浅埋偏压小净距隧道大型振动台实验研究　出处：《应用力学学报》2017年03期 　论文类型：期刊论文

【摘要】：浅埋偏压小净距隧道具有与其它形式隧道不同的受力特点,其地震响应特性也必然不同于其它隧道。基于相似理论设计并完成了浅埋偏压小净距隧道大型振动台模型实验,研究了小净距隧道分别在X(水平)向、Z(竖直)向、XZ双向(水平竖直同时输入)多种工况汶川地震波作用下隧道衬砌加速度和动应变响应规律。实验结果表明:(1)衬砌加速度受地震波的入射方向影响较大,且Z向的影响大于X向,XZ双向的影响大于单向,左洞隧道的加速度响应大于右洞隧道;(2)衬砌应变受地震烈度的影响较大,隧道衬砌在地震作用下承受拉压循环荷载,以受拉为主,右洞隧道衬砌的动应变响应大于左洞隧道;(3)综合衬砌加速度与动应变的响应分析,左洞隧道的左半部分和右洞隧道的拱脚是隧道衬砌在地震作用下容易发生损坏的部位,在进行设计配筋时应特别注意。对于浅埋偏压小净距隧道衬砌进行抗震设计计算时,应考虑Z向地震的影响。研究成果可为浅埋偏压小净距隧道工程的抗震设计提供参考。
[Abstract]:The shallow burying bias with small net distance tunnel has different stress characteristics from other types of tunnel. The seismic response characteristics of the tunnel must be different from that of other tunnels. Based on the similarity theory, the large shaking table model experiment of shallow buried bias small net distance tunnel is designed and completed, and the X- (horizontal) direction of the small net distance tunnel is studied. Zstraight. The acceleration and dynamic strain response of tunnel lining under the action of Wenchuan earthquake wave under different working conditions is obtained by XZ bidirectional (horizontal vertical input at the same time). The experimental results show that: 1). The acceleration of lining is greatly affected by the direction of incident seismic wave. The effect of Z direction is greater than that of X direction XZ direction, and the acceleration response of left tunnel is greater than that of right tunnel. (2) the lining strain is greatly affected by the earthquake intensity, the tunnel lining is subjected to the cyclic load of tension and compression under the earthquake, and the dynamic strain response of the right tunnel lining is larger than that of the left tunnel; 3) the response analysis of lining acceleration and dynamic strain shows that the left part of the left tunnel and the arch foot of the right tunnel are the places where the lining of the tunnel is liable to damage under earthquake. Special attention should be paid to the design of reinforcement. The effect of Z direction earthquake should be taken into account. The research results can be used as reference for seismic design of shallow buried bias pressure and small clear distance tunnel engineering.
【作者单位】：中南林业科技大学土木工程与力学学院;中南林业科技大学岩土工程研究所;
【基金】：国家自然科学基金(51204125;51404309)
【分类号】：U456
【正文快照】： 随着我国中西部地区基本建设的飞速发展,近年来新建了许多隧道工程,其中的一些隧道受到地形条件、线路整体规划、与道路桥梁连接方式、总体工程成本、环境效益等因素的制约,不可避免地出现了一些浅埋偏压小净距隧道。以往一些学者认为隧道等地下结构在围岩约束下,会有较好的抗

【相似文献】