列车振动荷载作用下膨胀岩盾构隧道的动力响应
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摘要
南宁轨道交通1号线采用盾构法穿越膨胀岩分布区。考虑不同岩层组合对列车振动荷载与膨胀力共同作用下隧道管片与围岩的动力响应进行数值模拟分析。结果表明:距离管片越远列车振动荷载引起的沉降越小;荷载条件相同时岩土体阻尼比越小受列车振动荷载影响越大,因而产生的沉降越大;不同岩层组合条件下隧底相同位置的位移、速度、加速度和竖向应力时程曲线均在加载初期突变,在施加的列车振动荷载稳定后近似呈简谐波动形式;隧道腰部所受的竖向应力最大,顶部所受的竖向应力最小。
Nanning Rail Transit Line 1 adopts shield tunneling method to cross the expansive rock distribution area.Considering different rock stratum combination,the dynamic responses of tunnel segment and surrounding rock under the combined action of train vibration load and expansive force were numerically simulated and analyzed.The results show that the farther the distance from the segment,the smaller the settlement caused by train vibration load is.When the load conditions are the same the smaller the damping ratio of rock and soil mass,the greater the influence of train vibration load will be and the larger the settlement will be.The displacement,velocity,acceleration and vertical stress time history curves at the same position of the tunnel bottom under different rock stratum combination conditions all change abruptly at the initial stage of loading,which is approximately in the form of simple harmoinic wave motion when the applied train vibration load is stable.The vertical stress on the waist of tunnel is the largest and the vertical stress on the top is the smallest.
Nanning Rail Transit Line 1 adopts shield tunneling method to cross the expansive rock distribution area.Considering different rock stratum combination,the dynamic responses of tunnel segment and surrounding rock under the combined action of train vibration load and expansive force were numerically simulated and analyzed.The results show that the farther the distance from the segment,the smaller the settlement caused by train vibration load is.When the load conditions are the same the smaller the damping ratio of rock and soil mass,the greater the influence of train vibration load will be and the larger the settlement will be.The displacement,velocity,acceleration and vertical stress time history curves at the same position of the tunnel bottom under different rock stratum combination conditions all change abruptly at the initial stage of loading,which is approximately in the form of simple harmoinic wave motion when the applied train vibration load is stable.The vertical stress on the waist of tunnel is the largest and the vertical stress on the top is the smallest.
引文
[1]李英杰.软弱深埋隧道围岩结构特性及支护荷载确定方法研究[D].北京:北京交通大学,2012.
[2]曾仲毅,徐帮树,胡世权,等.增湿条件下膨胀土隧道衬砌破坏数值分析[J].岩土力学,2014,35(3):871-880.
[3]崔蓬勃,朱永全,高焱,等.铁路膨胀岩隧道初期支护稳定性分析及设计优化[J].铁道建筑,2017,57(5):62-66.
[4]田燕.列车振动荷载对地下隧道结构安全性影响分析[D].青岛:青岛理工大学,2013.
[5]潘昌实,PANDE G N.黄土隧道列车动荷载响应有限元初步数定分析研究[J].土木工程学报,1984,17(4):19-28.
[6]李亮,张丙强,杨小礼.高速列车振动荷载下大断面隧道结构动力响应分析[J].岩石力学与工程学报,2005,24(23):4259-4265.
[7]李增光,吴天行.浮置板轨道动柔度计算方法及隔振性能研究[J].振动工程学报,2007,20(3):207-212.
[8]李鹏飞,周烨,伍冬.隧道围岩压力计算方法及其适用范围[J].中国铁道科学,2013,34(6):55-60.
[9]方勇,符亚鹏,崔戈,等.膨胀岩土地层环状膨胀对盾构隧道衬砌荷载的影响[J].地下空间与工程学报,2014,10(4):829-833,841.
[10]方勇,何川,齐春,等.砂卵石地层下伏膨胀岩土盾构隧道结构内力特征[J].西南交通大学学报,2014,49(3):386-392.
[11]方勇,崔戈,符亚鹏,等.膨胀岩土地层修建盾构隧道引起的局部膨胀荷载研究[J].重庆交通大学学报(自然科学版),2013,32(4):636-638,640-641.
[12]中华人民共和国住房和城乡建设部.城市轨道交通结构安全保护技术规范:CJJ/T 202—2013[J].北京:中国建筑工业出版社,2013.
[2]曾仲毅,徐帮树,胡世权,等.增湿条件下膨胀土隧道衬砌破坏数值分析[J].岩土力学,2014,35(3):871-880.
[3]崔蓬勃,朱永全,高焱,等.铁路膨胀岩隧道初期支护稳定性分析及设计优化[J].铁道建筑,2017,57(5):62-66.
[4]田燕.列车振动荷载对地下隧道结构安全性影响分析[D].青岛:青岛理工大学,2013.
[5]潘昌实,PANDE G N.黄土隧道列车动荷载响应有限元初步数定分析研究[J].土木工程学报,1984,17(4):19-28.
[6]李亮,张丙强,杨小礼.高速列车振动荷载下大断面隧道结构动力响应分析[J].岩石力学与工程学报,2005,24(23):4259-4265.
[7]李增光,吴天行.浮置板轨道动柔度计算方法及隔振性能研究[J].振动工程学报,2007,20(3):207-212.
[8]李鹏飞,周烨,伍冬.隧道围岩压力计算方法及其适用范围[J].中国铁道科学,2013,34(6):55-60.
[9]方勇,符亚鹏,崔戈,等.膨胀岩土地层环状膨胀对盾构隧道衬砌荷载的影响[J].地下空间与工程学报,2014,10(4):829-833,841.
[10]方勇,何川,齐春,等.砂卵石地层下伏膨胀岩土盾构隧道结构内力特征[J].西南交通大学学报,2014,49(3):386-392.
[11]方勇,崔戈,符亚鹏,等.膨胀岩土地层修建盾构隧道引起的局部膨胀荷载研究[J].重庆交通大学学报(自然科学版),2013,32(4):636-638,640-641.
[12]中华人民共和国住房和城乡建设部.城市轨道交通结构安全保护技术规范:CJJ/T 202—2013[J].北京:中国建筑工业出版社,2013.