|Table of Contents|

Mechanism and control method of large deformation for large-span chlorite schist tunnel (PDF)

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2021年02期
Page:
93-106
Research Field:
道路与铁道工程
Publishing date:

Info

Title:
Mechanism and control method of large deformation for large-span chlorite schist tunnel
Author(s):
CHEN Jian-xun;  CHEN Li-jun;  LUO Yan-bin;  WANG Chuan-wu;  LIU Wei-wei
(School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China)
Keywords:
tunnel engineering;  soft rock;  large-span tunnel;  deformation mechanism;  control method
PACS:
U457
DOI:
10.19818/j.cnki.1671-1637.2021.02.008
Abstract:
Based on the field test of deformations and stresses of supporting structures in the Lianchengshan Tunnel of Baoji-Hanzhong Expressway(double-hole six-lane), the characteristics and mechanism of large deformation disasters of large-span chlorite schist tunnels were analyzed, the comprehensive control method of large deformation disasters of the tunnel was summarized, the classification standard of large deformation of large-span chlorite schist tunnel was established, and the corresponding support parameters of each deformation grade were proposed. Analysis result shows that the large-span chlorite schist tunnel mainly has the settlement deformation during the tunnel excavation, which is mainly manifested as the overall settlement of the primary support. After the primary support is closed, the tunnel deformation is mainly manifested by the extrusion deformation of the side wall and the bottom heave of tunnel invert caused by the settlement of tunnel foot. The large deformation disasters are mainly as follows: the instability and collapse of tunnel face, primary support invasion and failure, the unsoldering and failure of feet-lock pipe, the cracking of secondary lining, the sinking of side wall, and the uplift and cracking of invert backfill. The chlorite schist is extremely weak and broken, and the invert base is softened by water, which are the fundamental causes of large deformation disaster of the tunnel. The large span of tunnel excavation(the maximum excavation span is 19.6 m), the flat tunnel section, and the lack of bearing capacity and effective restraint for arch foot foundation aggravate the deformation intrusion and instability failure of tunnel structure. The limited bearing capacity of primary support, causing loads to be continuously transmitted to the secondary lining, is the direct cause of the cracking of secondary lining. The deformation mechanism of surrounding rock can be summarized as the continuous downward slipping and looseningmechanism caused by the difficulty of the cohesion of arch rock mass in overcoming its own weight, and the plastic flow mechanism of soft rock caused by the low-strength stress ratio at the tunnel foot and invert. The large deformation disaster of the tunnel can be effectively avoided by adopting the comprehensive control method of “three-step core soil method+large reservation deformation+double-layer HK200b steel frame+large-diameter feet-lock pipe+radial grouting of surrounding rock+deepening tunnel invert”, and managing the large deformation hierarchically at the same time.5 tabs, 18 figs, 32 refs.

References:

[1] 周 辉,李 震,张传庆,等.水岩作用下绿泥石片岩的试验研究[C]∥雅砻江流域水电开发有限公司.雅砻江虚拟研究中心2014年度学术年会论文集.成都:雅砻江流域水电开发有限公司,2014:152-159.
ZHOU Hui, LI Zhen, ZHANG Chuan-qing, et al. Experimental Study of chlorite schist under water-rock action[C]∥Yalong River Basin Hydropower Development Co., Ltd. Proceedings of the 2014 Annual Academic Conference of Yalong River Virtual Research Center. Chengdu: Yalong River Basin Hydropower Development Co., Ltd., 2014: 152-159.(in Chinese)
[2] 刘 宁,张传庆,褚卫江,等.深埋绿泥石片岩变形特征及稳定性分析[J].岩石力学与工程学报,2013,32(10):2045-2052.
LIU Ning, ZHANG Chuan-qing, CHU Wei-jiang, et al. Deformation behavior and stability analysis of deep chlorite schist[J]. Chinese Journal of Rock Mechanics and Engineering, 2013, 32(10): 2045-2052.(in Chinese)
[3] 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.
WU Zhong-ming, SHEN Ya-xing, LI Shu-lin, et al. Data analysis on chlorite schist tunnel section of the diversion tunnel No.1 of Jinping Ⅱ Hydropower Station[J]. Dam and Safety, 2014(4): 37-42, 48.(in Chinese)
[4] 周春宏.深埋条件下绿泥石片岩洞段的变形特征[J].科技通报,2015,31(3):108-111.
ZHOU Chun-hong. Deformation characteristics of chlorite schist tunnel section under deep buried condition[J]. Bulletin of Science and Technology, 2015, 31(3): 108-111.(in Chinese)
[5] ZHANG Chuan-qing, CUI Guo-jian, ZHANG Yang, et al. Squeezing deformation control during bench excavation for the Jinping deep soft-rock tunnel[J]. Engineering Failure Analysis, 2020, 116: 104761.
[6] ZHOU Hui, ZHANG Chuan-qing, LI Zhen, 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] YANG Fan-jie, ZHANG Chuan-qing, ZHOU Hui, 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.
[8] 李 震,周 辉,宋雨泽,等.考虑硬化软化和剪胀特性的绿泥石片岩力学模型[J].岩土力学,2013,34(2):404-410.
LI Zhen, ZHOU Hui, SONG Yu-ze, et al. Mechanical model of chlorite schist considering hardening-softening and dilatancy characteristics[J]. Rock and Soil Mechanics, 2013, 34(2): 404-410.(in Chinese)
[9] 李 震,刘尚各,于建新,等.考虑弹塑性损伤耦合的绿泥石片岩力学模型研究[J].地下空间与工程学报,2017,13(1):101-107.
LI Zhen, LIU Shang-ge, YU Jian-xin, et al. Study on mechanical model of chlorite schist considering elastoplastic damage coupling[J]. Chinese Journal of Underground Space and Engineering, 2017, 13(1): 101-107.(in Chinese)
[10] 于德海,彭建兵.三轴压缩下水影响绿泥石片岩力学性质试验研究[J].岩石力学与工程学报,2009,28(1):205-211.
YU De-hai, PENG Jian-bing. Experimental study of mechanical properties of chlorite schist with water under triaxial compression[J]. Chinese Journal of Rock Mechanics and Engineering, 2009, 28(1): 205-211.(in Chinese)
[11] GOEL R K, JETHWA J L, PAITHANKAR A G. Tunnelling through the young Himalayas—a case history of the Maneri-Uttarkashi Power Tunnel[J]. Engineering Geology, 1995, 39(1): 31-44.
[12] 徐则民,黄润秋,张倬元,等.软岩向深埋隧道的流动[J].铁道工程学报,2000(2):73-76.
XU Ze-min, HUANG Run-qiu, ZHANG Zhuo-yuan, et al. Soft rocks flowing toward deep tunnel[J]. Journal of Railway Engineering Society, 2000(2): 73-76.(in Chinese)
[13] 高美奔,李天斌,孟陆波,等.隧道软岩大变形力学机制及防治措施综述[J].施工技术,2013,42(增):247-251.
GAO Mei-ben, LI Tian-bin, MENG Lu-bo, et al. Large deformation of soft rock tunnel large deformation mechanics and prevention measures[J]. Construction Technology, 2013, 42(S): 247-251.(in Chinese)
[14] 李 磊,谭忠盛.挤压性破碎软岩隧道大变形特征及机制研究[J].岩石力学与工程学报,2018,37(增1):3593-3603.
LI Lei, TAN Zhong-sheng. Characteristic and mechanism research for large deformation problem in squeezing-shattered soft rock tunnel[J]. Chinese Journal of Rock Mechanics and Engineering, 2018, 37(S1): 3593-3603.(in Chinese)
[15] 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.
YANG Jin-zhong, YANG Pei-zhou, ZENG Xiong-hui, et al. Technology for treatment of chlorite schist section in No.1 diversion tunnel of Jinping Ⅱ Hydropower Station and its application[J]. Water Resources and Hydropower Engineering, 2015, 46(4): 87-92.(in Chinese)
[16] 王小林,黄彦波.中外高地应力软岩隧道大变形工程技术措施对比分析——以兰渝铁路木寨岭隧道与瑞士圣哥达基线隧道为例[J].隧道建设,2018,38(10):1621-1629.
WANG Xiao-lin,HUANG Yan-bo. Comparison of large deformation control technologies for soft rock tunnel with high ground stress between China and foreign countries:a case study of Muzhailing Tunnel on Lanzhou-Chongqing Railway in China and Saint Gotthard Base Tunnel in Switzerland[J]. Tunnel Construction, 2018, 38(10): 1621-1629.(in Chinese)
[17] 关宝树.软弱围岩隧道变形及其控制技术[J].隧道建设,2011,31(1):1-17.
GUAN Bao-shu. Deformation of tunnels with soft surrounding rocks and its control[J]. Tunnel Construction, 2011, 31(1): 1-17.(in Chinese)
[18] 张 聪,阳军生,谢亦朋,等.非均质软弱围岩隧道注浆加固圈分布特性[J].交通运输工程学报,2019,19(3):58-70.
ZHANG Cong, YANG Jun-sheng, XIE Yi-peng, et al. Distribution characteristics of grouting reinforcement ring for tunnel with heterogeneous weak surrounding rock[J]. Journal of Traffic and Transportation Engineering, 2019, 19(3): 58-70.(in Chinese)
[19] 于天赐.软岩隧道大变形控制技术研究[J].土木工程学报,2017,50(S2):112-117.
YU Tian-ci. Study on large deformation control technology of tunnel in soft rock[J]. China Civil Engineering Journal, 2017, 50(S2): 112-117.(in Chinese)
[20] 陶志刚,罗森林,李梦楠,等.层状板岩隧道大变形控制参数优化数值模拟分析及现场试验[J].岩石力学与工程学报,2020,39(3):491-506.
TAO Zhi-gang, LUO Sen-lin, LI Meng-nan, et al. Optimization of large deformation control parameters of layered slate tunnels based on numerical simulation and field test[J]. Chinese Journal of Rock Mechanics and Engineering, 2020, 39(3): 491-506.(in Chinese)
[21] 陈建勋,罗彦斌.大跨度黄土公路隧道结构稳定性及控制技术研究[J].隧道与地下工程灾害防治,2019,1(1):93-101.
CHEN Jian-xun, LUO Yan-bin. The stability of structure and its control technology for large-span loess tunnel[J]. Hazard Control in Tunnelling and Underground Engineering, 2019, 1(1): 93-101.(in Chinese)
[22] 刘学增,罗仁立.大跨度公路隧道围岩竖向压力分布特征探讨[J].同济大学学报(自然科学版),2010,38(12):1741-1745.
LIU Xue-zeng, LUO Ren-li. Analysis of large-span highway tunnel surrounding rock vertical pressure attributes[J]. Journal of Tongji University(Natural Science), 2010, 38(12): 1741-1745.(in Chinese)
[23] 曲海锋,朱合华,蔡永昌.扁平大跨度公路隧道松动荷载计算方法探讨[J].岩土力学,2008,29(4):989-994,1000.
QU Hai-feng, ZHU He-hua, CAI Yong-chang. Discussion on calculation of loose load on extra-large cross-section and large-span road tunnel[J]. Rock and Soil Mechanics, 2008, 29(4): 989-994, 1000.(in Chinese)
[24] 段慧玲,张 林.大跨度公路隧道合理开挖方法对比研究[J].土木工程学报,2009,42(9):114-119.
DUAN Hui-ling, ZHANG Lin. Comparative study of rational excavation methods for large-span highway tunnels[J]. China Civil Engineering Journal, 2009, 42(9): 114-119.(in Chinese)
[25] 戴永浩,陈卫忠,田洪铭,等.大梁隧道软岩大变形及其支护方案研究[J].岩石力学与工程学报,2015,34(S2):4149-4156.
DAI Yong-hao, CHEN Wei-zhong, TIAN Hong-ming, et al. Study of large deformation and support measures of Daliang Tunnel with soft surrounding rockmass[J]. Chinese Journal of Rock Mechanics and Engineering, 2015, 34(S2): 4149-4156.(in Chinese)
[26] 陈子全,何 川,吴 迪,等.高地应力层状软岩隧道大变形预测分级研究[J].西南交通大学学报,2018,53(6):1237-1244.
CHEN Zi-quan, HE Chuan, WU Di, et al. Study of large deformation classification criterion for layered soft rock tunnels under high geostress[J]. Journal of Southwest Jiaotong University, 2018, 53(6): 1237-1244.(in Chinese)
[27] 陈丽俊,张运良,马震岳,等.软岩隧洞锁脚锚杆-钢拱架联合承载分析[J].岩石力学与工程学报,2015,34(1):129-138.
CHEN Li-jun, ZHANG Yun-liang, MA Zhen-yue, et al. Joint bearing analysis for feet-lock bolt and steel arch in weak rock tunnel[J]. Chinese Journal of Rock Mechanics and Engineering, 2015, 34(1): 129-138.(in Chinese)
[28] 罗彦斌,陈建勋.软弱围岩隧道锁脚锚杆受力特性及其力学计算模型[J].岩土工程学报,2013,35(8):1519-1525.
LUO Yan-bin, CHEN Jian-xun. Mechanical characteristics and mechanical calculation model of tunnel feet-lock bolt in weak surrounding rock[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(8): 1519-1525.(in Chinese)
[29] CHEN Li-jun, ZHANG Yun-liang, MA Zhen-yue. Analytical
approach for support mechanism of feet-lock pipe combined with steel frame in weak rock tunnels[J]. KSCE Journal of Civil Engineering, 2016, 20(7): 2965-2980.
[30] CHEN Li-jun, CHEN Jian-xun, LUO Yn-bin, et al. Vertical load and settlement at the foot of steel rib with the support of feet-lock pipe in soft ground tunnel[J]. Advances in Civil Engineering, 2019, 2019: 6186748.
[31] HØIEN A H, NILSEN B. Rock mass grouting in the løren tunnel:case study with the main focus on the grout ability and feasibility of drill parameter interpretation[J]. Rock Mechanics and Rock Engineering, 2014, 47(3): 967-983.
[32] 王 乾,曲立清,郭洪雨,等.青岛胶州湾海底隧道围岩注浆加固技术[J].岩石力学与工程学报,2011,30(4):790-802.
WANG Qian, QU Li-qing, GUO Hong-yu, et al. Grouting reinforcement technique of Qingdao Jiaozhou Bay Subsea Tunnel[J]. Chinese Journal of Rock Mechanics and Engineering, 2011, 30(4): 790-802.(in Chinese)

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Last Update: 2021-06-01