强震作用下工法对接变刚度隧道振动台试验研究

doi:10.13722/j.cnki.jrme.2022.0773

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摘要隧道穿越岩石和软土变化地层时通常采用钻爆法与盾构法进行分段掘进，并通过工法对接段实现不同隧道结构形式的转换，而隧道工法对接段不同的断面形状和结构形式导致结构刚度发生突变，成为隧道结构抗震设计的薄弱环节。针对强震频发区穿越土–岩过渡区域的隧道结构抗震问题，开展工法对接变刚度隧道受强地震动作用下的振动台模型试验研究，分析工法对接段结构加速度、围岩–衬砌压力、盾构隧道环缝张开变形等动力响应，并进一步揭示对接段刚度变化对隧道结构动力响应的影响规律。结果表明：隧道结构加速度放大系数随输入地震动强度的增大而减小，且隧道结构刚度越大，加速度放大效应影响更为明显；随着输入地震动强度的不断增大，围岩与衬砌间的接触压力逐渐增加，但输入峰值加速度达到0.5 g时接触压力增速趋缓，此时衬砌与围岩可能已进入局部塑性损伤状态；盾构衬砌管片间的接缝变形随着输入地震动强度的提高而增大，且靠近内衬加强段的盾构隧道管片因受到结构刚度突变的影响，其环缝张开量明显偏大，最大张开量约为盾构常规区段的5倍以上。研究成果可为实际工程工法对接段变刚度隧道结构的抗震设计提供指导。

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	禹海涛1
	任辉辉2
	陈俊涛3
	袁勇1
	贺维国4

关键词 ：隧道工程, 变刚度隧道, 振动台试验, 强震, 动力响应

Abstract：Drill-and-blast tunnel method and TBM tunnelling are commonly used in divisional excavation when a tunnel passes through rock and soil strata. A transition tunnel is generally built to connect the drill-and-blast tunnel and the TBM tunnel. As a result，the stiffness of the tunnel changes suddenly due to different cross sections and types. The transition tunnel becomes precarious under earthquake loadings，which should be paid significant attentions in seismic design. Regarding to the anti-earthquake issue of the tunnel passing through the rock-soil strata in seismically active areas，a shaking table test is carried out to study the seismic response of the transition tunnel under strong earthquake loadings. Accelerations at different tunnel portions，pressures between rock and lining，and joint extensions of the TBM tunnel are analysed based on the shaking table test. Furthermore，the influence of the stiffness change on the dynamic response of tunnel is discussed. Results show that the acceleration amplification factor of tunnel decreases with the increase of input ground motion intensity. The tunnel with larger stiffness leads to larger amplification factors. The rock-lining pressure increases with the increase of earthquake intensity；while the pressure shows a slow increase when the PGA reaches to 0.5 g. It is speculated that tunnel structure and rock show regional damages. Also，higher earthquake intensity shows larger joints extensions of shield tunnel. It is noted that the joint extension close to the inner lining is five times to the extension at normal area due to the sudden change of stiffness at the inner lining area. The research is able to provide guidance for the seismic design of the transition tunnel with changing stiffness.

Key words： tunnel engineering tunnel with variable stiffness shaking table test strong earthquake seismic response

引用本文:

禹海涛1，任辉辉2，陈俊涛3，袁勇1，贺维国4. 强震作用下工法对接变刚度隧道振动台试验研究[J]. 岩石力学与工程学报, 2023, 42(7): 1599-1609.
YU Haitao1，REN Huihui2，CHEN Juntao3，YUAN Yong1，HE Weiguo4. Shaking table experimental study on variable stiffness tunnels #br# under strong excitation. , 2023, 42(7): 1599-1609.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0773 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/I7/1599

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