地裂缝对地铁隧道围岩附加动土压力影响特征研究
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摘要
以西安地铁穿越地裂缝带的隧道工程为背景,在物理模型试验的基础上,重点分析了地铁列车运行过程中,地裂缝对列车振动引起的隧道围岩附加动土压力的影响特征。研究认为,在地铁隧道未产生脱空情况下,地裂缝对地铁列车振动产生的附加土压力具有衰减作用,列车从地裂缝下盘向上盘行驶时,附加土压力的衰减幅值明显大于列车从上盘向下盘行驶时的衰减幅值。地裂缝活动导致隧道脱空后,虽然地裂缝附近隧道底部的附加动土压力受地裂缝影响很小,但脱空改变了隧道结构的受力模式,使隧道的动力响应特征发生显著变化。这就提示设计人员在地铁列车穿越地裂缝带的隧道抗振设计中,上行线和下行线围岩中的附加动土压力的分布规律是不同的,在设计时应考虑这一特点,做到合理设计。
Taking the tunnel project of Xi'an subway crossing the ground fissure zone as the background,on the basis of physical model test,we analyze the influence characteristics of ground fissure on the additional dynamic earth pressure of tunnel surrounding rock caused by train vibration during subway train operation. The study shows that the ground fissure can attenuate the additional earth pressure produced by subway train vibration without void in subway tunnel. The attenuation amplitude of additional earth pressure is obviously larger than that of train running from the bottom of the ground fissure to the bottom of the subway train. Although the additional dynamic earth pressure at the bottom of the tunnel near the ground fissure is little affected by the ground fissure after the ground fissure activity leads to the tunnel void,the void changes the stress mode of the tunnel structure and makes the dynamic response characteristics of the tunnel change significantly. This suggests that the distribution of additional dynamic earth pressure in the surrounding rock of the upstream and downstream lines is different in the design of anti-vibration tunnels with subway trains passing through ground fissures.
Taking the tunnel project of Xi'an subway crossing the ground fissure zone as the background,on the basis of physical model test,we analyze the influence characteristics of ground fissure on the additional dynamic earth pressure of tunnel surrounding rock caused by train vibration during subway train operation. The study shows that the ground fissure can attenuate the additional earth pressure produced by subway train vibration without void in subway tunnel. The attenuation amplitude of additional earth pressure is obviously larger than that of train running from the bottom of the ground fissure to the bottom of the subway train. Although the additional dynamic earth pressure at the bottom of the tunnel near the ground fissure is little affected by the ground fissure after the ground fissure activity leads to the tunnel void,the void changes the stress mode of the tunnel structure and makes the dynamic response characteristics of the tunnel change significantly. This suggests that the distribution of additional dynamic earth pressure in the surrounding rock of the upstream and downstream lines is different in the design of anti-vibration tunnels with subway trains passing through ground fissures.
引文
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[15]蔡琳祥.地铁动荷载作用下与地裂缝小角度斜交隧道围岩动力响应研究[D].西安:长安大学,2015.
[16]杨觅.地裂缝带地铁动荷载作用下隧道——地层动力响应数值模拟研究[D].西安:长安大学,2014.
[17]张柯.地铁行车荷载作用下黄土地层的振动响应和沉降[D].西安:西安建筑科技大学,2011.
[2]门玉明,石玉玲.西安地裂缝研究中的若干重要科学问题[J].地球科学与环境学报,2008,30(2):172-176.
[3]陈志新,袁志辉,彭建兵,等.渭河盆地地裂缝发育基本特征[J].工程地质学报,2007,15(4):441-447.
[4]彭建兵,范文,黄强兵,等.西安市城市快速轨道交通二号线穿过地裂缝带的结构措施研究[R].西安:长安大学,铁道第一勘察设计院,2006.
[5]黄强兵,彭建兵,门玉明,等.地裂缝对地铁明挖整体式衬砌隧道影响机制的模型试验研究[J].岩石力学与工程学报,2008,27(11):2324-2331.
[6]黄强兵,彭建兵,樊红卫,等.西安地裂缝对地铁隧道的危害及防治措施研究[J].岩土工程学报,2009,31(5):781-788.
[7]Nelson P M.Transportation Noise Reference Book[M].Buttewrprth&Co.Ltd,1987.
[8]Melke J Noise and Vibration from underground railway lines:proposals for a prediction procedure[J].J.S.&Vib,1988,120(2):289-297.
[9]Kurzweil G.Ground borne noise and vibration from underground rail systems[J].Journal of Sound and Vibration,1979,66(3):363-370.
[10]徐忠根,任珉,杨泽群,等.广州市地铁一号线振动传播对环境影响测定与分析[J].环境技术,2002(4):12-14.
[11]洪俊清,刘伟庆.地铁对周边建筑物振动影响分析[J].振动与冲击,2006,25(4):142-145.
[12]陶连金,李晓霖,等.地铁诱发地面运动的衰减规律的分析研究[J].世界地震工程,2003,19(1):83-87.
[13]袁立群.列车荷载作用下马蹄形地铁隧道——地裂缝——地层动力相互作用研究[D].西安:长安大学,2014.
[14]刘蕾.列车荷载作用下地裂缝与大角度斜交马蹄形地铁隧道动力相互作用研究[D].西安:长安大学,2015.
[15]蔡琳祥.地铁动荷载作用下与地裂缝小角度斜交隧道围岩动力响应研究[D].西安:长安大学,2015.
[16]杨觅.地裂缝带地铁动荷载作用下隧道——地层动力响应数值模拟研究[D].西安:长安大学,2014.
[17]张柯.地铁行车荷载作用下黄土地层的振动响应和沉降[D].西安:西安建筑科技大学,2011.