Large Deformation Characteristics and Control Measures of Chlorite Schist Tunnels: A Case Study on Xianglushan Tunnel of Water Diversion in Central Yunnan

LIU Hai-ming; CHENG Yuan-deng; WU Yong-hong; ZHANG Yu-ting; DING Wen-yun; WANG Zhong-wei

doi:10.11988/ckyyb.20221017

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Journal of Changjiang River Scientific Research Institute ›› 2022, Vol. 39 ›› Issue (12) : 42-48. DOI: 10.11988/ckyyb.20221017

STABILITY ANALYSIS OF WEAK SURROUNDING ROCK MASSES

Large Deformation Characteristics and Control Measures of Chlorite Schist Tunnels: A Case Study on Xianglushan Tunnel of Water Diversion in Central Yunnan

LIU Hai-ming¹, CHENG Yuan-deng¹, WU Yong-hong¹, ZHANG Yu-ting², DING Wen-yun³, WANG Zhong-wei⁴

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Abstract

The aim of this research is to further understand the law of large deformation during the excavation of deep-buried soft rock tunnels. The chlorite schist section of Xianglushan Tunnel under construction of the Central Yunnan Water Diversion Project is taken as a research background. Constitutive models more suitable for soft rock tunnels are compared and analyzed by using FLAC^3D. The effects of controlling large deformation by the excavation method with reserved core soil step (working condition 1), the pilot pit method on one sidewall (working condition 2) and the excavation method with middle partition wall (working condition 3) are compared and analyzed. Results unveil that the maximum settlement of the vault obtained by Hoek-Brown (H-B) strain softening model is greater than that of the ideal elastic-plastic model, and the error with actual settlement is 9.3%. The vault settlement in working conditions 1 and 3 reduced by about 20% compared with that in working condition 2, and the convergence deformation of arch waist and arch wall in working condition 3 is obviously controlled compared with working conditions 1 and 2. From the perspectives of large deformation control effect and plastic zone distribution, the excavation method with middle partition wall (working condition 3) could effectively reduce the deformation of chlorite schist segment of the tunnel.

Key words

chlorite schist / strain softening model / high ground stress / large deformation / numerical simulation / excavation method

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LIU Hai-ming, CHENG Yuan-deng, WU Yong-hong, ZHANG Yu-ting, DING Wen-yun, WANG Zhong-wei. Large Deformation Characteristics and Control Measures of Chlorite Schist Tunnels: A Case Study on Xianglushan Tunnel of Water Diversion in Central Yunnan[J]. Journal of Changjiang River Scientific Research Institute. 2022, 39(12): 42-48 https://doi.org/10.11988/ckyyb.20221017

References

[1] 王旺盛,陈长生,王家祥,等.滇中引水工程香炉山深埋长隧洞主要工程地质问题[J].长江科学院院报,2020,37(9):154-159.
[2] 陈建勋,陈丽俊,罗彦斌,等.大跨度绿泥石片岩隧道大变形机理与控制方法[J].交通运输工程学报,2021,21(2):93-106.
[3] 陈丽俊,陈建勋,罗彦斌,等.深埋大跨度绿泥石片岩隧道变形规律及合理预留变形量[J].中国公路学报,2021,34(6):147-157.
[4] ZHANG C, CUI G, ZHANG Y, et al. Squeezing Deformation Control During Bench Excavation for the Jinping Deep Soft-rock Tunnel[J]. Engineering Failure Analysis, 2020, 116: 104761.
[5] 解亚东,朱高云,陈强.隧道穿越绿泥石片岩地段施工方案优化比选[J].施工技术,2020,49(19):110-113.
[6] ZHOU H, ZHANG C, LI Z, et al. Analysis of Mechanical Behavior of Soft Rocks and Stability Control in Deep Tunnels[J]. Journal of Rock Mechanics and Geotechnical Engineering, 2014, 6(3): 219-226.
[7] ZHANG C, ZHANG Y, HUI Z, et al. Surrounding Rock Deformation Control for Deep-buried Soft-rock Tunnels[J]. Modern Tunnelling Technology, 2018, 55(2): 28-35.
[8] 陈建勋,刘伟伟,陈丽俊,等.绿泥石片岩地层大跨度公路隧道大变形控制及合理支护形式现场试验[J].中国公路学报,2020,33(12):212-223.
[9] LIU W, CHEN J, LUO Y,et al. Deformation Behaviors and Mechanical Mechanisms of Double Primary Linings for Large-span Tunnels in Squeezing Rock: a Case Study[J]. Rock Mechanics and Rock Engineering, 2021, 54(5): 2291-2310.
[10]YANG F, ZHANG C, ZHOU H, et al. The Long-term Safety of a Deeply Buried Soft Rock Tunnel Lining Under Inside-to-outside Seepage Conditions[J]. Tunnelling and Underground Space Technology, 2017, 67: 132-146.
[11]吴忠明,沈亚兴,李数林,等.锦屏二级水电站1号引水隧洞绿泥石片岩洞段监测成果初步分析[J].大坝与安全,2014(4):37-42,48.
[12]杨进忠,杨培洲,曾雄辉,等.锦屏二级水电站1^#引水隧洞绿泥石片岩洞段处理技术与应用[J].水利水电技术,2015,46(4):87-92.
[13]HUO W, XUE S, ZHAO Z, et al. Numerical Simulation and Analysis of the Three-step Excavation of an Extra-large Cross Section and a Low Flat-ratio Railway Tunnel[J]. Soft Computing, 2021, 25(18): 12117-12130.
[14]霍润科,秋添,李曙光,等.不同加固方案下富水黄土隧道地层变形规律分析[J].长江科学院院报,2020,37(7):96-104.
[15]邵珠山,王孟辉.黄土地区非对称小净距隧道的合理错距研究[J].长江科学院院报,2022,39(10):80-87.
[16]HOEK E, BROWN E T. Empirical Strength Criterion for Rock Masses[J]. Journal of Ceotechnical and Geoenvironmental Engineering, ASCE, 1980, 106(9): 1013-1035.
[17]HOEK E, CARRANZA-TORRES C, CORKUM B. Hoek-Brown Failure Criterion-2002 Edition[C]//Proceedings of 5th North American Rock Mechanics Symposium and 17th Tunnelling Association of Canada Conference. Toronto: University of Toronto. Ontario, Canada, July 7-10, 2002: 267-273.
[18]陆银龙,王连国,杨峰,等.软弱岩石峰后应变软化力学特性研究[J].岩石力学与工程学报,2010,29(3):640-648.
[19]何昌国.软弱围岩大跨隧道合理预留变形量分析及初期支护刚度优化[J].隧道建设,2018,38(增刊2):227-231.