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首页> 外文期刊>Tunnelling and underground space technology >Study on the failure mechanism of rock mass around a mined-out area above a highway tunnel - Similarity model test and numerical analysis
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Study on the failure mechanism of rock mass around a mined-out area above a highway tunnel - Similarity model test and numerical analysis

机译：高速公路隧道落地面积岩体破坏机理研究 - 相似性模型试验及数值分析

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摘要

Tunnel construction beneath a mined-out area may inevitably break the existing balance of the surrounding rock mass, which would result in the collapse of the inner cavity of the mined-out area and even the deformation of the tunnel structure. Based on the engineering background of the Yudushan tunnel of the major expressway guarantee project for the 2022 Beijing Olympic Winter Games, both the similarity model test and numerical simulations were conducted to investigate the failure mechanism of the rock mass around the mined-out area above the highway tunnel. In the model test, we studied the progressive failure process of the surrounding rock during tunnel excavation and loading. The information obtained by using a variety of monitoring methods indicated that the displacement changes at different positions in the mined-out area were generally concave, and the stress variations detected by the stress sensors were different for each position in the tunnel. At the same time, by comparing the results with those of the numerical simulation, the validity and accuracy of the results in the model test were verified. Furthermore, the effects of the relative parameters of the mined-out area on the failure mechanism were discussed in terms of the length, location and distance to the tunnel in the numerical simulations. The test and simulations revealed the failure law of the surrounding rock and tunnel deformation characteristics during the excavation beneath a mined-out area, which had beneficial significance for guiding similar engineering construction.
机译：在挖掘区域下面的隧道结构可能不可避免地打破周围岩体的现有平衡，这将导致挖出区域内腔的塌陷，甚至是隧道结构的变形。基于2022年北京奥运冬季的主要高速公路掘进项目的Yudushan隧道的工程背景，进行了相似性模型试验和数值模拟，以研究岩石围绕挤出地区的岩石质量的故障机理公路隧道。在模型测试中，我们研究了隧道挖掘和装载过程中周围岩石的渐进故障过程。通过使用各种监测方法获得的信息表明，在挖出区域中的不同位置处的位移变化通常是凹形的，并且由应力传感器检测的应力变化对于隧道中的每个位置不同。同时，通过将结果与数值模拟的结果进行比较，验证了模型测试中结果的有效性和准确性。此外，在数值模拟中，根据隧道的长度，位置和距离来讨论挖出区域对故障机制上的相对参数的影响。测试和仿真揭示了挖掘区域下方挖掘过程中周围岩石和隧道变形特性的故障定律，这对引导类似的工程建设具有有益意义。

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  • 来源
    《Tunnelling and underground space technology》 |2021年第12期|104182.1-104182.13|共13页
  • 作者

    Zhou Yu; Feng Shiwen; Li Jianwang;

  • 作者单位

    Univ Sci & Technol Beijing Minist Efficient Min & Safety Met Mines Key Lab Beijing 100083 Peoples R China;

    Univ Sci & Technol Beijing Minist Efficient Min & Safety Met Mines Key Lab Beijing 100083 Peoples R China|Beijing Inst Technol State Key Lab Explos Sci & Technol Beijing 100081 Peoples R China;

    Univ Sci & Technol Beijing Minist Efficient Min & Safety Met Mines Key Lab Beijing 100083 Peoples R China|China Railway 16th Bur Grp Co Ltd Beijing 100018 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Tunnel excavation; Mined-out area; Failure mechanism; Similarity model test; Numerical analysis;

    机译：隧道挖掘;挖掘区域;失败机制;相似性模型试验;数值分析;

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