张海, 杜雪姣, 刘中宪, 徐颖, 杨国岗. 平面SV波入射下山体地形中双线隧道动力响应[J]. 工程力学, 2020, 37(7): 77-88. DOI: 10.6052/j.issn.1000-4750.2019.07.0404
引用本文: 张海, 杜雪姣, 刘中宪, 徐颖, 杨国岗. 平面SV波入射下山体地形中双线隧道动力响应[J]. 工程力学, 2020, 37(7): 77-88. DOI: 10.6052/j.issn.1000-4750.2019.07.0404
ZHANG Hai, DU Xue-jiao, LIU Zhong-xian, XU Ying, YANG Guo-gang. DYNAMIC RESPONSES OF DOUBLE MOUNTAIN TUNNELS UNDER SV WAVES[J]. Engineering Mechanics, 2020, 37(7): 77-88. DOI: 10.6052/j.issn.1000-4750.2019.07.0404
Citation: ZHANG Hai, DU Xue-jiao, LIU Zhong-xian, XU Ying, YANG Guo-gang. DYNAMIC RESPONSES OF DOUBLE MOUNTAIN TUNNELS UNDER SV WAVES[J]. Engineering Mechanics, 2020, 37(7): 77-88. DOI: 10.6052/j.issn.1000-4750.2019.07.0404

平面SV波入射下山体地形中双线隧道动力响应

DYNAMIC RESPONSES OF DOUBLE MOUNTAIN TUNNELS UNDER SV WAVES

  • 摘要: 根据弹性波动理论,结合“分区契合”思想,采用间接边界元方法,考察SV波入射下隧道—山体系统整体地震反应特征和相互作用规律。通过参数分析讨论入射波频率和角度、衬砌隧道位置等因素对山体表面及附近地表的地面运动、山体内部衬砌隧道本身应力、位移的影响。计算结果表明:山体中衬砌隧道的存在对附近地震波有显著的放大作用。整体上看,随着无量纲频率η增大,隧道环向应力逐渐减小,地表位移幅值震荡更为剧烈,空间分布更复杂;山体与隧道尺寸的比值较小时,隧道内环向应力集中比较显著,随着山体与隧道尺寸比的增加,环向应力峰值呈现减小的整体趋势,应力集中区域显著减少;随SV波入射角度α的增大,两隧道衬砌内部环向应力均有增加的趋势。另外,隧道间距越小,衬砌动应力集中效应越发显著。

     

    Abstract: According to the theory of elastic fluctuation and combined with the area-partition and region-matching techniques, we adopted a high precision indirect boundary element method to investigate the seismic response characteristics and the interaction of a tunnel-mountain system under an SV wave incidence. Through a parametric analysis, we investigated the influence of the frequency, incident angle and lining tunnel location on the nearby ground movement and the stress and displacement in the lining tunnel. The lining tunnels in the mountain had a significant amplification effect on the nearby seismic wave. With the increase in the dimensionless frequency η, the circumferential stress of the tunnel decreases, the surface displacement oscillated more intensely and the spatial distribution became more complicated. When the size ratio of the mountain to the tunnel was small, the circumferential stress concentration in the tunnel was obvious. With the increase in the size ratio, the circumferential stress decreased and stress concentration area was significantly reduced. With the increase in the incident angle α of the SV wave, the circumferential stress in the lining was increased. In addition, the concentration effect was more significant for the dynamic stress of the lining when space between the tunnels was small.

     

/

返回文章
返回