|Table of Contents|

Calculation method of bearing capacity and comprehensive comparison of parameters for initial support of weak rock tunnels(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2025年4期
Page:
68-80
Research Field:
桥梁与隧道工程
Publishing date:

Info

Title:
Calculation method of bearing capacity and comprehensive comparison of parameters for initial support of weak rock tunnels
Author(s):
CHEN Li-jun1;  ZHANG Jia-rui1;  CHEN Jian-xun1;  LIU Rui-hui2; LUO Yan-bin1;  WANG Chuan-wu1
(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. China Communications Construction Company First Highway Consultants Co., Ltd., Xi'an 710075, Shaanxi, China)
Keywords:
tunnel engineering;  steel rib;  bearing capacity calulation;  shotcrete;  initial support
PACS:
U452
DOI:
10.19721/j.cnki.1671-8879.2025.04.006
Abstract:
In view of the fact that the steel rib and shotcrete are the main components of the initial support of weak surrounding rock tunnels, but there is still a lack of unified and perfect structural calculation methods, resulting in blind support design, this paper provided the calculation methods for the material equivalent elastic modulus and structural bearing capacity of the steel rib and shotcrete initial support. Combined with the calculation examples, the comparative analysis of different structural bearing capacity calculation methods for steel rib and shotcrete initial support was carried out. The bearing capacity and engineering economy of the initial support structure with different support schemes were comprehensively compared. The results show that the maximum relative error of the equivalent elastic modulus of the initial support of the steel rib and shotcrete obtained by three methods(equivalent bending stiffness of the section, equivalent compressive stiffness of the section, and both equivalent bending stiffness and compressive stiffness of the section)is about 6%. Considering the reinforcement effect of steel rib flanges on shotcrete, the initial support is considered as a reinforced concrete structure, or considering the steel rib and shotcrete initial support as a steel reinforced concrete structure, the difference in the calculated structural bearing capacity between these two methods is about 9%. In view of safety considerations, it is recommended to use the bearing capacity calculation method of steel rib shotcrete initial support as reinforced concrete structure. If the strength growth process of shotcrete is not considered, the steel frame and shotcrete with ultimate strength are considered to be loaded synchronously, the bearing capacity of initial supports with different support schemes is ranked as I25a, HW200, I22a, HW175, I20b, I20a, and HW150. The order of required engineering costs is HW200, I25a, HW175, I22a, I20b, I20a, and HW150. Considering the structural bearing capacity and engineering economy, I20a/b steel rib is superior to HW175 steel rib and I22a steel rib is superior to HW200 steel rib. However, HW175 steel rib is superior to I22 steel rib and HW200 steel rib is superior to I25 steel rib for the tunnels with high requirements for early strength and stiffness.10 tabs, 5 figs, 32 refs.

References:

[1] 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.
CHEN Jian-xun, LIU Wei-wei, CHEN Li-jun, et al. In-situ experimental study on large-deformation control and reasonable support forms for a large-span highway tunnel in chlorite schist[J]. China Journal of Highway and Transport, 2020, 33(12): 212-223.
[2]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.
CHEN Li-jun, CHEN Jian-xun, LUO Yan-bin, et al. Deformation law and reasonable reserved deformation of deep large-span chlorite schist tunnel[J]. China Journal of Highway and Transport, 2021, 34(6): 147-157.
[3]仇文革,孙克国,王立川,等.基于围岩稳定性的大断面隧道初期支护优化[J].土木工程学报,2017,50(增2):8-13.
QIU Wen-ge, SUN Ke-guo, WANG Li-chuan, et al. Primary support optimization of large section tunnel based on surrounding rock stability[J]. China Civil Engineering Journal, 2017, 50(S2): 8-13.
[4]张德华,刘士海,任少强.基于围岩-支护特征理论的高地应力软岩隧道初期支护选型研究[J].土木工程学报,2015,48(1):139-148.
ZHANG De-hua, LIU Shi-hai, REN Shao-qiang. Research on selection of preliminary support for tunnel in high ground-stress soft rock based on surrounding rock-support characteristic curve theory[J]. China Civil Engineering Journal, 2015, 48(1): 139-148.
[5]张顶立,陈峰宾,房 倩.隧道初期支护结构受力特性及适用性研究[J].工程力学,2014,31(7):78-84.
ZHANG Ding-Li, CHEN Feng-Bin, FANG Qian. Study on mechanical characteristics and applicability of primary lining used in tunnel[J]. Engineering Mechanics, 2014, 31(7): 78-84.
[6]陈秋南,曾 奥,罗 鹏,等.圆宝山隧道炭质板岩大变形段初期支护结构受力特性研究[J].应用力学学报,2020,37(2):810-817,944-945.
CHEN Qiu-nan, ZENG Ao, LUO Peng, et al. Study on stress characteristics of primary support structure in large deformation section of carbonaceous slate in Yuanbaoshan tunnel[J]. Chinese Journal of Applied Mechanics, 2020, 37(2): 810-817, 944-945.
[7]杨成永,欧阳杰,陆景慧.隧道型钢钢架初期支护安全性评价[J].西南交通大学学报,2014,49(2):254-259.
YANG Cheng-yong, OUYANG Jie, LU Jing-hui. Assessment on safety of steel reinforced shotcrete support for tunnels[J]. Journal of Southwest Jiaotong University, 2014, 49(2): 254-259.
[8]扈世民.基于收敛-约束法地铁区间隧道初期支护安全性研究[J].铁道学报,2015,37(10):117-121.
HU Shi-min. Research on safety of initial support in metro regional tunnel based on convergence-confinement method[J]. Journal of the China Railway Society, 2015, 37(10): 117-121.
[9]伍毅敏,蔡直言,傅鹤林,等.基于精细化模型的初期支护安全性评价[J].中国安全科学学报,2019,29(增1):168-172.
WU Yi-min, CAI Zhi-yan, FU He-lin, et al. Safety evaluation of initial support based on refined model[J]. China Safety Science Journal, 2019,29(S1): 168-172.
[10]田志宇,田尚志,杨 枫,等.百丈隧道穿越流塑状富水破碎带施工措施及其安全性评价[J].现代隧道技术,2020,57(2):176-183.
TIAN Zhi-yu, TIAN Shang-zhi, YANG Feng, et al. Engineering measures and safety evaluation of Baizhang tunnel passing through flow plastic water-rich fracture zone[J]. Modern Tunnelling Technology, 2020, 57(2): 176-183.
[11]肖明清,徐 晨.复合式衬砌隧道总安全系数设计法修正与应用研究[J].隧道建设,2019,39(3):421-429.
XIAO Ming-qing, XU Chen. Modification and application of design method for total safety factor of composite lining tunnel[J]. Tunnel Construction, 2019, 39(3): 421-429.
[12]WONG L, FANG Q, ZHANG D. Mechanical analysis of circular tunnels supported by steel sets embedded in primary linings[J]. Tunnelling and Underground Space Technology, 2013, 37(8): 80-88.
[13]肖明清,王少锋,陈立保,等.基于荷载结构法的隧道初期支护设计方法研究[J].铁道工程学报,2018,35(4):60-64.
XIAO Ming-qing, WANG Shao-feng, CHEN Li-bao, et al. Research on the design method of primary support of tunnel based on the load-structure method[J]. Journal of Railway Engineering Society, 2018, 35(4): 60-64.
[14]田志宇,曹长斌,吴庆发,等.基于承载能力量化分析的隧道支护体系设计方法在枫木界隧道Ⅲ级围岩较差段的应用[C]//中国公路学会.2015年全国公路隧道学术交流会论文集.重庆:重庆大学出版社,2015:43-49.
TIAN Zhi-yu, CAO Chang-bin, WU Qing-fa, et al. The application of tunnel support system design method based on quantitative analysis of bearing capacity in the poor section of grade Ⅲ surrounding rock of Fengmujie tunnel[C]// China Highway & Transportation Society. Proceeding of 2015 National Highway Tunnel Symposium. Chongqing: Chongqing University Press, 2015: 43-49.
[15]李志清,丁春林,王科元,等.浅埋大断面黄土隧道初期支护安全性分析[J].地下空间与工程学报,2014,10(5):1151-1157.
LI Zhi-qing, DING Chun-lin, WANG Ke-yuan, et al. Mechanical characteristics and safety analysis of initial support in large section shallow loess tunnel[J]. Chinese Journal of Underground Space and Engineering, 2014, 10(5): 1151-1157.
[16]徐帮树,杨为民,王者超,等.公路隧道型钢喷射混凝土初期支护安全评价研究[J].岩土力学,2012,33(1):248-254.
XU Bang-shu, YANG Wei-ming, WANG Zhe-chao, et al. Study of initial support safety evaluation about shape steel reinforced shotcrete in highway tunnel[J]. Rock and Soil Mechanics, 2012, 33(1): 248-254.
[17]李建敦,肖 靖,江 鸿,等.浅埋软岩隧道大变形特征及控制措施[J].科学技术与工程,2022,22(3):1243-1249.
LI Jian-dun, XIAO Jing, JIANG Hong, et al. Large deformation characteristics and control measures of shallow buried soft rock tunnel[J]. Science Technology and Engineering, 2022, 22(3): 1243-1249.
[18]马振旺,郭新新,喻 炜,等.V级围岩条件下超大断面隧道的适宜喷层厚度研究[J].公路交通科技,2020,37(7):103-110.
MA Zhen-wang, GUO Xin-xin, YU Wei, et al. Study on suitable shotcrete layer thickness of ultra-large section tunnel under grade v surrounding rock condition[J]. Journal of Highway and Transportation Research and Development,2020, 37(7): 103-110.
[19]孙振宇,张顶立,房 倩,等.隧道初期支护与围岩相互作用的时空演化特性[J].岩石力学与工程学报,2017,36(增2):3943-3956.
SUN Zhen-yu, ZHANG Ding-li, FANG Qian, et, al. Spatial and temporal evolution characteristics of interaction between primary support and tunnel surrounding rock[J]. Chinese Journal of Rock Mechanics and Engineering, 2017, 36(S2): 3943-3956.
[20]徐 飞,李术才,石少帅,等.千枚岩隧道传统与新型支护结构现场对比试验研究[J].岩石力学与工程学报,2017,36(3):609-621.
XU Fei, LI Shu-cai, SHI Shao-shuai, et al. Field test comparison of traditional and new type supporting structures in a phyllite tunnel[J]. Chinese Journal of Rock Mechanics and Engineering, 2017, 36(3): 609-621.
[21]朱正国,李文江,刘志春,等.软弱围岩隧道掌子面挤出变形特征分析[J].地下空间与工程学报,2017,13(3):711-716,736.
ZHU Zheng-guo, LI Wen-jiang, LIU Zhi-chun, et al. Characteristics analysis of tunnel face extrusion deformation in weak surrounding rock[J]. Chinese Journal of Underground Space and Engineering, 2017, 13(3): 711-716, 736.
[22]张德华,刘士海,任少强.高地应力软岩隧道中型钢与格栅支护适应性现场对比试验研究[J].岩石力学与工程学报,2014,33(11):2258-2266.
ZHANG De-hua, LIU Shi-hai, REN Shao-qiang. Research on selection of preliminary support for tunnel in high ground-stress soft rock based on surrounding rock-support characteristic curve theory[J]. Chinese Journal of Rock Mechanics and Engineering, 2014, 33(11): 2258-2266.
[23]周鹏发,申玉生,赵建沣,等.基于改进遍布节理模型的陡倾千枚岩隧道灾变机制研究[J].岩石力学与工程学报,2019,38(9):1870-1883.
ZHOU Peng-fa, SHEN Yu-sheng, ZHAO Jian-feng, et al. Research on disaster-induced mechanism of tunnels with steeply dipping phyllite strata based on an improved ubiquitous-joint constitutive model[J]. Chinese Journal of Rock Mechanics and Engineering, 2019, 38(9): 1870-1883.
[24]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2):227-231.
HE Chang-guo. Analysis of reasonable reserved deformation amount of large-span tunnel in soft surrounding rock and preliminary optimization of initial support stiffness[J]. Tunnel Construction, 2018, 38(S2): 227-231.
[25]周 平,王志杰,徐海岩,等.昔格达地层隧道变形特性曲线及变形机理研究[J].土木工程学报,2018,51(10):107-121.
ZHOU Ping, WANG Zhi-jie, XU Hai-yan, et al. Study on the deformation characteristic curve and deformation mechanism of the Xigeda strata tunnel[J]. China Civil Engineering Journal, 2018, 51(10): 107-121.
[26]陈京贤,曾德荣,王俊召,等.基于应力释放率的大跨径回填土隧道的围岩稳定性研究[J].中外公路,2018,38(6):173-177.
CHEN Jing-xian, ZENG De-rong, WANG Jun-zhao, et al. Study on the stability of surrounding rock of long-span backfill tunnel based on stress release rate[J]. Journal of China & Foreign Highway, 2018, 38(6): 173-177.
[27]王志杰,杨 跃.含水率对昔格达地层大断面隧道初期支护安全性影响研究[J].铁道标准设计,2017,61(11):100-105.
WANG Zhi-jie, YANG Yue. Research on effect of moisture content on initial support safety of large cross-section tunnel in Xigeda fm strata[J]. Railway Standard Design, 2017, 61(11): 100-105.
[28]贾晓旭,赵玉成.软弱围岩隧道CD法和台阶法施工力学行为分析[J].铁道标准设计,2016,60(7):121-125.
JIA Xiao-xu, ZHAO Yu-cheng. Analysis of mechanical behavior of tunneling in weak surrounding rock by CD method and benching method[J]. Railway Standard Design, 2016, 60(7): 121-125.
[29]JTG/T 3372—2024,公路黄土隧道设计与施工技术规范[S].
JTG/T 3372—2024, Technical Specifications for Design and Construction of Highway Tunnels in Loess[S].
[30]田志宇,汪 波.公路隧道结构计算改进探索与工程实践[M].北京:人民交通出版社股份有限公司,2018.
TIAN Zhi-yu, WANG Bo. Improvement exploration and engineering practive of highway tunnel strulture calculation[M]. Beijing: China Communications Press Co., Ltd., 2018.

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Last Update: 2025-07-25