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三类勘察场地地裂缝活动对地铁隧道的影响

孟振江 彭建兵 黄强兵 邓亚虹 赵林浩 邢燕

孟振江, 彭建兵, 黄强兵, 邓亚虹, 赵林浩, 邢燕. 三类勘察场地地裂缝活动对地铁隧道的影响[J]. 交通运输工程学报, 2017, 17(2): 41-51.
引用本文: 孟振江, 彭建兵, 黄强兵, 邓亚虹, 赵林浩, 邢燕. 三类勘察场地地裂缝活动对地铁隧道的影响[J]. 交通运输工程学报, 2017, 17(2): 41-51.
MENG Zhen-jiang, PENG Jian-bing, HUANG Qiang-bing, DENG Ya-hong, ZHAO Lin-hao, XING Yan. Influence of ground fissure activity on subway tunnel in third-kind surveying site[J]. Journal of Traffic and Transportation Engineering, 2017, 17(2): 41-51.
Citation: MENG Zhen-jiang, PENG Jian-bing, HUANG Qiang-bing, DENG Ya-hong, ZHAO Lin-hao, XING Yan. Influence of ground fissure activity on subway tunnel in third-kind surveying site[J]. Journal of Traffic and Transportation Engineering, 2017, 17(2): 41-51.

三类勘察场地地裂缝活动对地铁隧道的影响

基金项目: 

国家973计划项目 2014CB744700

中国地质调查局地质调查项目 DD20160235

国家自然科学基金项目 41372327

国家自然科学基金项目 41372328

中央高校基本科研业务费专项资金项目 310826174001

详细信息
    作者简介:

    孟振江(1984-), 男, 河南濮阳人, 长安大学工程师, 工学博士研究生, 从事地质灾害研究

    彭建兵(1953-), 男, 湖北麻城人, 长安大学教授, 工学博士

  • 中图分类号: U457.5

Influence of ground fissure activity on subway tunnel in third-kind surveying site

More Information
    Author Bio:

    MENG Zhen-jiang(1984-), male, engineer, doctoral student, +86-29-82339238, mengzj@chd.edu.cn

    PENG Jian-bing(1953-), male, professor, PhD, +86-29-82339012, dicexy_1@chd.edu.cn

  • 摘要: 以地铁隧道穿越西安三类勘察场地的地裂缝为研究原型, 分析了地裂缝的发育特征; 运用数值模拟方法, 研究了三类场地地裂缝不同活动量值引起的地层应力场、破坏区域和位移场的变化特征, 计算了地裂缝的影响区域范围, 解析了地裂缝带活动对地铁隧道结构产生的破坏特征, 并提出了相应的工程对策。研究结果表明: 地裂缝活动造成其两侧地层的竖向应力呈近似反对称的分布形态, 地层应力的变化增量随上盘沉降的增加而增大; 通过综合分析位于地铁隧道拱顶和拱底埋深处地层的竖向应力变化特征, 得到三类场地地裂缝上盘和下盘的主要影响范围分别为0~20m和0~15m, 经对比验证, 与物理模型试验结果一致; 下盘靠近地裂缝的区域发生剪切破坏, 且破裂逐渐向上扩展, 最终形成一条与地裂缝呈18°夹角的剪切破坏包线, 其中间包含的范围为剪切破坏的集中区域; 地裂缝活动导致两侧土体发生位移突变, 形成2个类似“活动楔体”的变形区域, 且该区域范围逐渐扩大; 上、下盘隧道的差异沉降随着地裂缝错动量的增加而增大, 当地裂缝活动量达到20cm时, 造成整体式地铁隧道呈“S”破坏形态; 为适应三类场地地裂缝活动引起的大变形, 建议地铁隧道结构采用分段设置特殊变形缝加柔性接头处理等措施进行设防。

     

  • 图  1  地裂缝与地貌构造位置关系

    Figure  1.  Location relation of ground fissures and geomorphological structures

    图  2  三类地裂缝场地分布

    Figure  2.  Distribution of third-class ground fissures sites

    图  3  地铁线路与地裂缝相交平面

    Figure  3.  Intersecting plane of metro line and ground fissures

    图  4  计算模型

    Figure  4.  Calculation model

    图  5  埋深15m处竖向应力变化曲线

    Figure  5.  Changing curves of vertical stresses at buried depth 15m

    图  6  埋深25m处竖向应力变化曲线

    Figure  6.  Changing curves of vertical stresses at buried depth 25m

    图  7  不同沉降引起的下盘破坏区域

    Figure  7.  Damaged areas of lower plate under different settlements

    图  8  不同沉降下的竖向位移

    Figure  8.  Vertical displacements under different settlements

    图  9  隧道数值计算模型

    Figure  9.  Numerical calculation model of tunnel

    图  10  地裂缝带和隧道的空间关系

    Figure  10.  Spatial relationship of ground fissure zone and tunnel

    图  11  不同沉降下的地层变形

    Figure  11.  Strata deformations under different settlements

    图  12  物理模型顶面土体垂直于轴线方向的沉降曲线

    Figure  12.  Settlement curves of physical model top soil perpendicular to axis direction

    图  13  地铁隧道变形

    Figure  13.  Deformations of subway tunnel

    图  14  隧道顶部围岩沉降变化曲线

    Figure  14.  Changing curves of surrounding rock settlement at tunnel top

    表  1  主要地层计算参数

    Table  1.   Calculation parameters of main stratums

    下载: 导出CSV

    表  2  沉积地层计算参数

    Table  2.   Calculation parameters of sedimentary stratums

    下载: 导出CSV

    表  3  隧道单元计算参数

    Table  3.   Calculation parameters of tunnel unit

    下载: 导出CSV
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