笔架山深埋公路隧道高地应力场特征分析及岩爆预测
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作者单位:

1.中铁十五局集团第五工程有限公司;2.河南科技大学土木工程学院

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TU 457

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国家自然科学基金资助项目


Characteristic Analysis of High In-situ Stress Field and Rockburst Prediction of Bijiashan Deep-Buried Highway Tunnel
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1.China Railway th Construction Bureau Fifth Engineering Group Corporation;2.Civil Engineering School,Henan University of Science and Technology

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    摘要:

    深埋隧道岩体中有较高地应力,在岩石强度较高的围岩处易发生岩爆,影响围岩稳定性。笔架山公路隧道埋深大,为降低其安全建设风险,本文通过工程区岩样岩体力学实验对围岩性质进行研究,结合地应力资料建立三维有限元地质模型反演隧址区地应力场,最终利用谷-陶岩爆判据和强度应力比判据对笔架山隧道岩爆状态进行预测。结果表明:隧道工程区内岩体有中等-强烈岩爆倾向;隧道沿线地应力场由自重应力场主导,大多数区段岩体处于极高应力状态,且水平最大主应力与隧道夹角较小,有利于围岩稳定;开挖后沿线围岩最大主应力峰值为63.2MPa,均发生在断面侧壁,因此在该部位发生岩爆的可能性较大;隧道沿线24%区段有发生岩爆的可能,且以中等-高岩爆活动为主,岩爆预测结果可为隧道开挖施工和灾害防治提供参考。

    Abstract:

    There is high in-situ stress in the rock mass of deep-buried tunnels, and rock bursts are prone to occur in the surrounding rock with high rock strength, which affects the stability of the surrounding rock. The Bijiashan Highway Tunnel is deeply buried. In order to reduce its safety construction risk. In this paper, the properties of surrounding rocks were studied through mechanical experiments of rock samples in the engineering area, and a three-dimensional finite element geological model was established to invert the in-situ stress field in the tunnel site area based on in-situ stress data. Finally, the Gu-Tao rockburst criterion and the R_b/σ_1 criterion were used to predict the rockburst state of the Bijiashan Tunnel. The results show that the rock mass in the tunnel engineering area has a moderate and strong rockburst tendency. The in-situ stress field along the tunnel is dominated by the gravity stress field, and the rock mass in most sections is in an extremely high stress state. The angle between the maximum horizontal principal stress and the tunnel is small, which is beneficial to the surrounding rock stability. After excavation, the peak of the maximum principal stress of the surrounding rock of the tunnel on the whole line is 63.2MPa, which all occur on the sidewall of the section, so there is a greater possibility of rockburst in this part. Rockburst is likely to occur in 24% of the sections along the tunnel, and it is dominated by moderate and high rockburst activities. The results of rockburst prediction can provide references for tunnel excavation and disaster prevention.

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孙峰伟,乔栋磊,安艳军,等. 笔架山深埋公路隧道高地应力场特征分析及岩爆预测[J]. 科学技术与工程, , ():

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  • 收稿日期:2021-12-02
  • 最后修改日期:2022-04-28
  • 录用日期:2022-04-30
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