新建隧道下穿高速公路动力响应及变形控制研究
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摘要
为揭示上部重型汽车振动荷载对立体交叉工程结构稳定性的影响,依托祁家庄隧道近接下穿既有G6高速公路工程,结合重型汽车运动微分方程建立的基于现场振动实测激励输入模型,运用连续介质快速拉格朗日差分分析法,研究重型汽车振动荷载作用下公路路基体、围岩夹层和下部隧道结构的动力响应特性和变形规律。结果表明,在重型汽车进入和驶离目标断面时,路基监测点动位移曲线呈现周期性变化且存在汽车荷载叠加效应,最大动位移达2.93 mm;隧道开挖促进应力-应变滞回圈的形成,加剧振动波能量的损失,动应力累计衰减0.248 kPa;重型汽车荷载引起的振动效应是造成下部隧道拱顶沉降的主要原因,其最大变形达0.226 mm;采用循环进尺为2 m的上下台阶法,可保证交叉段上部公路及下部隧道的安全和稳定。
In order to reveal the influence on stability of the three-dimensional cross engineering structure induced by the vibration load form the heavy duty vehicle, the paper was based on the existing number G6 highway project undercrossed by Qijiazhuang Tunnel, and adopted the Fast Lagrangian Analysis of Continua and the differential equation of motion of heavy duty vehicle to build a numerical model by the field vibration measured excitation input. And the dynamic response characteristics and deformation laws of subgrade, surrounding rock interlayer and tunnel structure under the condition of vibration load are studied. The study shows that the dynamic displacement curve of subgrade changes periodically and vehicle load exist superposition effect when the heavy duty vehicle drives to the target section and leaves, and the maximum dynamic displacement is 2.93 mm. Tunnel excavation promotes the formation of stress-strain hysteresis loop and the energy loss of vibration wave, which reflects the cumulative attenuation of dynamic stress is 0.248 kPa. The vibration effect caused by the load of heavy-duty vehicles is the main cause of the settlement of the lower tunnel vault, and the maximum deformation is 0.226 mm. The safety and stability of the upper highway and the lower tunnel in the cross section can be guaranteed by using the benching method with the 2 m cycle rulers.
In order to reveal the influence on stability of the three-dimensional cross engineering structure induced by the vibration load form the heavy duty vehicle, the paper was based on the existing number G6 highway project undercrossed by Qijiazhuang Tunnel, and adopted the Fast Lagrangian Analysis of Continua and the differential equation of motion of heavy duty vehicle to build a numerical model by the field vibration measured excitation input. And the dynamic response characteristics and deformation laws of subgrade, surrounding rock interlayer and tunnel structure under the condition of vibration load are studied. The study shows that the dynamic displacement curve of subgrade changes periodically and vehicle load exist superposition effect when the heavy duty vehicle drives to the target section and leaves, and the maximum dynamic displacement is 2.93 mm. Tunnel excavation promotes the formation of stress-strain hysteresis loop and the energy loss of vibration wave, which reflects the cumulative attenuation of dynamic stress is 0.248 kPa. The vibration effect caused by the load of heavy-duty vehicles is the main cause of the settlement of the lower tunnel vault, and the maximum deformation is 0.226 mm. The safety and stability of the upper highway and the lower tunnel in the cross section can be guaranteed by using the benching method with the 2 m cycle rulers.
引文
[1] 吕志涛,张生,邓怡虎,等.围岩蠕变对隧道下穿建筑物施工变形的影响[J].地下空间与工程学报,2014,10(6):1380-1386.
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[11] 刘新军.地铁隧道下穿高速铁路联络线路基安全影响分析[J].铁道标准设计,2017,61(6):131-136.
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[13] 安军海,陶连金,李积栋,等.地铁双层交叉隧道非线性地震响应分析[J].中国铁道科学,2015,36(3):66-72.
[14] 于鹤然,周晓军.高速列车动荷载作用下立体交叉铁路隧道动力响应研究[J].铁道学报,2015,37(6):103-111.
[15] 黄希,晏启祥,陈诚,等.列车振动荷载作用下交叉盾构隧道动力响应与损伤分析[J].铁道建筑,2016(8):60-64.
[16] Balendra T,Koh C G,Ho Y C.Dynamic response of buildings due to trains in underground tunnels[J].Earthquake Engineering and Structural Dynamics,1991,20(3):276-291.
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[18] 谭立新,彭立敏,李玉峰,等.铁路立体交叉隧道影响分区与施工技术[M].北京:人民交通出版社,2014:14-15.
[19] 仇文革.地下工程近接施工力学原理与对策的研究[D].成都:西南交通大学,2003:189-190.
[20] 赵伯明,蒋英礼,陈靖.软土地铁车站结构在三维强地震动作用下的响应分析[J].中国铁道科学,2009,30(3):45-50.
[21] 黄锋,朱合华.开挖进尺对大断面隧道变形的影响[J].铁道建筑,2013(8):56-58.
[22] 董捷,武志辉,许高峰.路桥过渡段动力测试及病害劣化机理研究[J].公路,2017,62(10):51-57.
[23] 汪洋,何川,曾东洋,等.盾构隧道正交下穿施工对既有隧道影响的模型试验与数值模拟[J].铁道学报,2010,32(2):79-85.
[2] Yamaguchi I,Yamazaki I,Kiritani Y.Study of ground-tunnel interactions of four shield tunnels driven in close proximity-in relation to design and construction of parallel shield tunnels[J].Tunnelling and Underground Space Technology,1998,13(3):289-304.
[3] 雷位冰.温福铁路琯头岭隧道下穿公路隧道施工技术[J].地下空间与工程学报,2007,3(4):758-764.
[4] 陈卫军,张璞.列车动载作用下交叠隧道动力响应数值模拟[J].岩土力学,2002,23(6):770-774.
[5] 高继锦,黄彪,张威,等.地面堆载条件下交叉穿越隧道的竖向位移计算方法研究[J].隧道建设(中英文),2018,38(5):818-823.
[6] 刘徽,袁野.非对称既有建筑荷载对大跨度公路隧道影响的有限元分析[J].公路工程,2017,42(6):182-187.
[7] 黄海斌,周平,陈鹏,等.双线公路隧道下穿铁路隧道不同施工工法理论研究[J].铁道标准设计,2016,60(11):104-109.
[8] 李延涛,温永刚,宗金辉,等.交叉地铁隧道对上部结构影响的地震反应分析[J].工程抗震与加固改造,2018,40(2):156-161.
[9] 陈宇.京沈客专朝阳隧道下穿既有锦赤铁路桥梁施工安全性数值分析[J].铁道标准设计,2018,62(7):109-114.
[10] 许有俊,葛绍英,孙超.隧道斜交下穿施工引起既有线的沉降变形分析[J].建筑技术,2017,48(11):1163-1166.
[11] 刘新军.地铁隧道下穿高速铁路联络线路基安全影响分析[J].铁道标准设计,2017,61(6):131-136.
[12] 朱正国,杨利海,王晓男.交叉隧道耦合动荷载动力响应及安全分析[J].铁道工程学报,2018,35(3):63-68.
[13] 安军海,陶连金,李积栋,等.地铁双层交叉隧道非线性地震响应分析[J].中国铁道科学,2015,36(3):66-72.
[14] 于鹤然,周晓军.高速列车动荷载作用下立体交叉铁路隧道动力响应研究[J].铁道学报,2015,37(6):103-111.
[15] 黄希,晏启祥,陈诚,等.列车振动荷载作用下交叉盾构隧道动力响应与损伤分析[J].铁道建筑,2016(8):60-64.
[16] Balendra T,Koh C G,Ho Y C.Dynamic response of buildings due to trains in underground tunnels[J].Earthquake Engineering and Structural Dynamics,1991,20(3):276-291.
[17] 晏启祥,徐亚军,陈诚,等.近距离空间交叉盾构隧道列车振动响应特性研究[J].铁道标准设计,2016,60(6):60-65.
[18] 谭立新,彭立敏,李玉峰,等.铁路立体交叉隧道影响分区与施工技术[M].北京:人民交通出版社,2014:14-15.
[19] 仇文革.地下工程近接施工力学原理与对策的研究[D].成都:西南交通大学,2003:189-190.
[20] 赵伯明,蒋英礼,陈靖.软土地铁车站结构在三维强地震动作用下的响应分析[J].中国铁道科学,2009,30(3):45-50.
[21] 黄锋,朱合华.开挖进尺对大断面隧道变形的影响[J].铁道建筑,2013(8):56-58.
[22] 董捷,武志辉,许高峰.路桥过渡段动力测试及病害劣化机理研究[J].公路,2017,62(10):51-57.
[23] 汪洋,何川,曾东洋,等.盾构隧道正交下穿施工对既有隧道影响的模型试验与数值模拟[J].铁道学报,2010,32(2):79-85.