浅埋小净距偏压隧道地震响应特性与承载力安全分析
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摘要
与非偏压隧道相比,浅埋偏压隧道稳定性较差,受地震动荷载的影响更为敏感。结合实际工程,运用FLAC有限差分法研究了浅埋、偏压、小净距隧道结构在水平地震荷载作用下的动力时程响应,对比分析了左、右两洞的内力(轴力、剪力、弯矩)变化规律和动力安全系数。研究结果表明:衬砌结构的地震响应、受力状态与地形条件密切相关;在两洞埋深差异较大的情况下,埋深较浅的左洞的地震响应明显比右洞剧烈,其受力比右洞更为不利;位于埋深较深侧的右洞满足抗震强度要求,而位于埋深较浅侧的左洞不满足抗震的强度要求,需要采取一定的抗震加固措施。所得结论可为类似偏压隧道工程的抗震设计提供指导。
Compared with those bearing symmetrical surrounding rock pressure,the unsymmetrical-pressure tunnels have worse stability and are more sensitive to seismic.The dynamic response of the shallow-embedded,bias and small clear distanced tunnels under horizontal seismic loading was studied by using the commercially available finite difference code FLAC.A comparative analysis of the internal forces(axial force,shear force and bending moment) and dynamic safety coefficients of the left tunnel and right tunnel was carried out.The results show that the stress state of lining structures induced by seismic load is closely related to the topographic condition of tunnels.Moreover,in the case of large depth difference between the two tunnels,the seismic response of the left shallow-embedded tunnel is significantly more intense than that of the right tunnel.And the tunnel with shallower depth is in much more unfavorable stress states.The right deep depth tunnel meets the seismic strength requirements,but some reinforcement measures must be taken to the left shallow-buried tunnel which does not meet the the seismic strength requirements.The obtained conclusions can provide useful guidance to the seismic design of the similar bias tunnels.
Compared with those bearing symmetrical surrounding rock pressure,the unsymmetrical-pressure tunnels have worse stability and are more sensitive to seismic.The dynamic response of the shallow-embedded,bias and small clear distanced tunnels under horizontal seismic loading was studied by using the commercially available finite difference code FLAC.A comparative analysis of the internal forces(axial force,shear force and bending moment) and dynamic safety coefficients of the left tunnel and right tunnel was carried out.The results show that the stress state of lining structures induced by seismic load is closely related to the topographic condition of tunnels.Moreover,in the case of large depth difference between the two tunnels,the seismic response of the left shallow-embedded tunnel is significantly more intense than that of the right tunnel.And the tunnel with shallower depth is in much more unfavorable stress states.The right deep depth tunnel meets the seismic strength requirements,but some reinforcement measures must be taken to the left shallow-buried tunnel which does not meet the the seismic strength requirements.The obtained conclusions can provide useful guidance to the seismic design of the similar bias tunnels.
引文
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[3]何川,耿萍,晏启祥.汶川大地震隧道工程震害初步分析[C]//汶川大地震工程震害调查分析与研究.2009,779-800.HE Chuan,GENG Ping,YAN Qi-xiang.The prelinminaryseismic damage analysis of tunnel engsneering in wen-chuan earth quake[C]//Dannage Investigation and Re-search in Wenchuan Areat Earthquake,2009:779-800.
[4]高波,王峥峥,袁松,等.汶川地震公路隧道震害启示[J].西南交通大学学报,2009,44(3):336-341,374.GAO Bo,WANG Zheng-zheng,YUAN Song,et al.Les-sons learnt from damage of highway tunnels in Wenchuanearthquake[J].Journal of Southwest Jiaotong University,2009,44(3):336-341,374.
[5]王英学,高波,申玉生.圆形隧道洞身衬砌结构内力地震动力响应分析[J].路基工程,2010,50(3):4-6.WANG Ying-xue,GAO Bo,SHEN Yu-sheng.Analysison earthquake dynamic response of internal force of liningstructure in a circular tunnel[J].Subgrade Engineering,2010,50(3):4-6.
[6]周健,秦天,孔戈.武汉长江隧道横断面地震响应分析[J].工程抗震与加固改造,2007,29(2):84-91,94.ZHOU Jian,QIN Tian,KONG Ge.Transverse seismicresponse study of wuhan changjing tunnel[J].EarthquakeResistant Engineering and Retrofitting,2007,29(2):84-91,94.
[7]高峰,关宝树.沉管隧道三维地震反应分析[J].兰州铁道学院学报,2003,22(1):6-10.GAO Feng,GUAN Bao-shu.Three-dimensional seismicresponse analysis of immersed tunnelb[J].Journal ofLanzhou Railway Institute,2003,22(1):6-10.
[8]耿萍,何川,晏启祥.盾构隧道纵向地震响应分析[J].西南交通大学学报,2007,42(3):283-287.GENG Ping,HE Chuan,YAN Qi-xiang.Analysis of lon-gitudinal seismic response of shield tunnel[J].Journal ofSouthwest Jiaotong University,2007,42(3):283-287.
[9]Lysmer J,Kuhlemeyer R L.Finite dynamic model for in-finite media[J].Journal of the Engineering Mechanics,ASCE,1969,95(4):859-877.
[10]JTG D70—2004,公路隧道设计规范[S].JTG D70—2004,Code for design of road tunnel[S].
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