盾构隧道-工作井节点振动台试验设计与分析

发布时间：2018-04-10 12:01

本文选题：盾构隧道 + 工作井节点　；参考：《中国公路学报》2017年08期

【摘要】：为研究盾构隧道-工作井节点地震响应特征,进行振动台模型试验。该试验几何相似比为1∶60,盾构隧道模型材料为聚乙烯,工作井模型采用尼龙材质进行3D打印技术制作;模型土采用砂与锯末按1∶2.5质量比混合配置;模型箱尺寸为10.0m×4.5m×1.5m的刚性箱。盾构隧道模型由衬砌环模型拼装而成,衬砌环模型纵向切槽模拟纵缝对管片横向刚度的弱化;通过环间卡扣式连接键模拟纵向螺栓,通过旋转模型拼装角度模拟管片错缝拼装。首先进行自由场模型试验,考虑不同地震动输入,得到模型土加速度响应;其次开展盾构隧道-工作井节点振动台模型试验,考虑不同地震动输入方向、不同地震动类型,得到隧道模型环缝张开量、加速度响应、环向应变等数据。研究结果表明:模型箱结构设计合理,边界条件满足要求,试验数据可靠;工作井模型和盾构隧道模型加速度响应频率成分相同,均受模型土控制,两者差异主要为加速度响应幅值不同;盾构隧道-工作井节点在地震作用下环缝张开量明显大于远离该节点的常规区段,前者为后者的1.6~4.5倍;地震动输入方向会导致区间段隧道模型环缝张开量明显变化,但对盾构隧道-工作井节点环缝张开量无显著影响;地震作用下盾构隧道-工作井节点会使工作井模型产生较大环向应变,但不会造成节点处盾构隧道模型环向变形增大。
[Abstract]:In order to study the seismic response characteristics of shield tunnel-working well node, shaking table model test was carried out.The geometric similarity ratio of the test is 1: 60, the shield tunnel model material is polyethylene, the working well model is made of nylon material, the model soil is mixed with sand and sawdust at 1: 2.5 mass ratio.A rigid box with a size of 10.0m 脳 4.5m 脳 1.5m.The shield tunnel model is composed of the lining ring model, the longitudinal slot of the lining ring model simulates the weakening of the longitudinal joint to the transverse stiffness of the segment, the longitudinal bolt is simulated by the clasp connection key between the rings, and the segment staggered joint is simulated by the rotation model.At first, the free field model test is carried out, considering the different ground motion input, the acceleration response of the model soil is obtained. Secondly, the shaking table model test of shield tunnel-working well node is carried out, considering different ground motion input directions and different ground motion types.The opening, acceleration response and toroidal strain of the tunnel model are obtained.The results show that the design of the model box is reasonable, the boundary conditions meet the requirements, the test data are reliable, the acceleration response frequency components of the working well model and the shield tunnel model are the same, and they are controlled by the model soil.The main difference between the two is that the amplitude of acceleration response is different, the opening of the annulus joint of shield tunnel-working well is obviously larger than that of the conventional section far away from the joint under seismic action, and the former is 1.6 ~ 4.5 times of the latter.The working well model will produce large circumferential strain under seismic action, but it will not cause the circumferential deformation of shield tunnel model at the node.
【作者单位】：同济大学岩土及地下工程教育部重点实验室;中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室;同济大学地下建筑与工程系;同济大学土木工程防灾国家重点实验室;上海城投公路投资(集团)有限公司;
【基金】：国家自然科学基金项目(51678438,51478343) 上海市青年科技启明星计划项目(17QC1400500) 上海市科学技术委员会重点攻关项目(16DZ1200302,16DZ1201904) 中国矿业大学深部岩土力学与地下工程国家重点实验室开放基金项目(SKLGDUEK1723)
【分类号】：U455.43

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