| 高地应力软岩隧道初期支护优化研究* |
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| 引用本文： | 邵珠山,李希,赵南南,张喆,乔汝佳.高地应力软岩隧道初期支护优化研究*[J].中国安全生产科学技术,2021,17(5):99-105. |
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| 作者姓名： | 邵珠山 李希 赵南南 张喆 乔汝佳 |
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| 作者单位： | （1.西安建筑科技大学 土木工程学院，陕西 西安 710055；2.西安建筑科技大学 陕西省岩土与地下空间工程重点实验室，陕西 西安 710055） |
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| 基金项目： | * 基金项目: 国家自然科学基金项目(11872287)；陕西省重点研发计划项目(2019ZDLGY01-10) |
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| 摘 要： | 为研究边墙曲率、支护参数等因素对高地应力软岩隧道变形控制的效果，以大瑞铁路营盘山隧道为工程背景，结合现场监测数据，建立有限元模型，分析不同边墙矢跨比及初期支护参数对隧道变形的影响，借此得到合理的初期支护参数。结果表明:原有支护结构中“直边墙”对于隧道水平方向变形与压力抵抗能力较弱，当边墙曲率调整至0.12后，支护结构的受力和变形情况得到明显改善；初期支护参数中锚杆参数对于隧道变形控制效果较小，增强衬砌的强度可以有效控制隧道的变形；通过围岩-支护特征曲线对优化后的支护方案进行安全评价，发现其安全性能较之前显著增强，现场应用结果也表明支护结构并未出现破坏失稳现象，隧道变形得到有效控制。研究结果对类似工程变形控制及支护方案优化提供一定的参考依据。
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| 关 键 词： | 软岩隧道 初期支护 边墙曲率 特征曲线 安全评价 |
Research on optimization of initial support for soft rock tunnel with high ground stress |
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| SHAO Zhushan,LI Xi,ZHAO Nannan,ZHANG Zhe,QIAO Rujia.Research on optimization of initial support for soft rock tunnel with high ground stress[J].Journal of Safety Science and Technology,2021,17(5):99-105. |
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| Authors: | SHAO Zhushan LI Xi ZHAO Nannan ZHANG Zhe QIAO Rujia |
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| Affiliation: | (1.School of Civil Engineering,Xi’an University of Architecture & Technology,Xi’an Shaanxi 710055,China;2.Shaanxi Key Lab of Geotechnical and Underground Space Engineering,Xi’an University of Architecture & Technology,Xi’an Shaanxi 710055,China) |
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| Abstract: | In order to study the effect of deformation control by the sidewall curvature,support parameters and other factors,taking the Yingpanshan tunnel of Dali-Ruili railway as the engineering background,the on-site monitoring data were ananlyzed,and a finite element model was established.The deformation of tunnel after excavation and the influence of different sidewall curvatures and support parameters on the deformation of tunnel were analyzed,and the reasonable initial support parameters were obtained.The results showed that the "vertical sidewall" of the original support structure was weak in resistance to the horizontal deformation and pressure of the tunnel,and when the sidewall curvature was adjusted to 0.12,the stress and deformation of the support structure were significantly improved.In the initial support parameters,the parameters of bolt had little effect for the deformation control of tunnel,and the deformation of tunnel could be effectively controlled by increasing the strength of lining.The safety evaluation on the optimized support scheme was carried out through the characteristic curve,and it was found that the safety performance was significantly enhanced than the previous one.The on-site application results also presented that the support structure did not appear the failure or instability phenomena,and the tunnel deformation was effectively controlled.The research results provide a certain reference basis for the deformation control and support scheme optimization of similar engineerings. |
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| Keywords: | soft rock tunnel initial support sidewall curvature characteristic curve safety evaluation |
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