• 论文
主办单位:煤炭科学研究总院有限公司、中国煤炭学会学术期刊工作委员会
下穿隧道开挖对松散堆积边坡稳定性影响的物理模型试验研究
  • Title

    Physical model test study on steady state effect of underpass tunnel excavation on loose deposit slope

  • 作者

    陶志刚 张庆周杨晓杰赵菲菲曹诗定李韫芃

  • Author

    TAO Zhigang,ZHANG Qingzhou,YANG Xiaojie,ZHAO Feifei,CAO Shiding,LI Yunpeng

  • 单位

    中国矿业大学(北京) 力学与建筑工程学院中国矿业大学(北京) 深部岩土力学与地下工程国家重点实验室深圳市综合交通设计研究院有限公司

  • Organization
    School of Mechanics and Civil Engineering,China University of Mining and Technology-Beijing;State Key Laboratory of Geome⁃ chanics and Deep Underground Engineering,China University of Mining and Technology-Beijing;Shenzhen Transportation Design & Research Institute Co.,Ltd.
  • 摘要

    隧道与边坡的空间展布特征边坡岩体结构特征隧道开挖工序其他影响外因等直接关系 到隧道和边坡的协同稳定特性。 为探究复杂地质条件下隧道-边坡体系的稳定性以深圳部九窝 弃土场堆积体边坡为研究对象通过物理模型试验探索隧道下穿开挖扰动影响松散堆积体边坡的 变形机理。 首先基于隧道和边坡实际几何特征和空间展布特征确定最佳相似比构建上覆松散 堆积体边坡的物理模型;然后开展了降雨条件下大断面隧道下穿开挖与未开挖两种工况的物理模 型对比试验通过分析降雨条件下坡体内部含水率孔隙水压力和土压力的变化规律揭示了降雨 条件下在松散堆积体边坡下方开挖大断面隧道导致边坡失稳的变形机制;最后采用具有负泊松比 特性的恒阻大变形锚索提出大跨度隧道的围岩 NPR(Negative Poissons Ratio)锚索控制措施并 通过数值模拟进行控制效果验证。 研究结果表明:经过一定的降雨历时松散堆积边坡的破坏由表 层扩展到深层主要变形模式为冲蚀型冲沟;隧道下穿开挖会形成较大范围的松动圈和临空面当边 坡冲沟掏蚀区与隧道松动圈重叠后隧道内易发生涌水局部塌方等灾害继而诱发上覆边坡出现局 部滑塌破坏现象。 采用 NPR 锚索对下穿隧道围岩进行高预紧力应力补偿控制隧道拱顶下沉和上覆 边坡变形均得到有效控制为类似工程背景的隧道支护和边坡加固方案的设计提供新的思路


  • Abstract

    The spatial distribution characteristics of tunnel and loose dump slope,the structural characteristics of slope rock mass,the excavation procedure of tunnel,and other influencing factors are directly related to the cooperative sta⁃ bility characteristics of tunnel and loose dump slope. In this paper,the deformation mechanism of the loose dump slope affected by tunneling disturbance is explored by a physical model test in a waste dump in Shenzhen. Firstly,the opti⁃ mal similarity ratio is determined based on the actual geometric characteristics and spatial distribution characteristics of tunnel and loose dump slope,and the physical model of overlying loose dump body slope is constructed. Then,under the condition of rainfall,a comparison of physical model experiments is conducted for the large⁃span tunnel ex⁃ cavation with two kinds of the working condition of under⁃excavation and without excavation. By analyzing the slope body internal moisture content,pore water pressure,and earth pressure under the conditions of rainfall,the deforma⁃ tion mechanism of the slope instability caused by excavating large⁃span tunnel under loose dump slope with the condi⁃ tion of rainfall. Finally, using the constant resistance and large deformation anchor cable with negative Poisson ratio,the control measures of the NPR (Negative poisson’s ratio) anchor cable in the surrounding rock of the large⁃ span tunnel are proposed,and the control effect is verified by numerical simulation. The results show that after a cer⁃ tain rainfall duration,the failure of the loose dump slope extends from surface to deep,and the main deformation mode is erosion gully. When the slope gully cut area overlaps with the tunnel loose circle,water gushing and local collapse are easy to occur in the tunnel,and then the local collapse of the overlying slope is induced. The NPR anchor cable is used to compensate for the high preload stress of the surrounding rock of the underpass tunnel,and the subsidence of the tunnel vault and the deformation of the overlying slope are effectively controlled,which provides a new idea for the design of tunnel support and slope reinforcement schemes with a similar engineering background.



  • 关键词

    隧道下穿边坡松散堆积边坡物理模型试验NPR 锚索协同稳定

  • KeyWords

    tunnel through the slope;loose accumulation slope;physical model test;NPR anchor cable;synergistic stable

  • 引用格式
    陶志刚,张庆周,杨晓杰,等. 下穿隧道开挖对松散堆积边坡稳定性影响的物理模型试验研究[J].煤炭学报,2021,47(S1):61-76.
  • Citation
    TAO Zhigang,ZHANG Qingzhou,YANG Xiaojie,et al. Physical model test study on steady state effect of under⁃ pass tunnel excavation on loose deposit slope[J]. Journal of China Coal Society,2021,47(S1):61-76.
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主办单位:煤炭科学研究总院有限公司 中国煤炭学会学术期刊工作委员会

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