Abstract：In order to reduce the deformation of tunnels located in broken surrounding rock with high ground stresses，the advantages and disadvantages of different types of bolts(cables) are analyzed. Combined with model test，a new type of prestressed pipe-cable(PPC) structure for tunnels is developed. This study introduces the bearing mechanism of the new developed PPC structure and sets up a coupling mechanical bearing model based on the PPC structure by theoretical analysis. Furthermore，the bearing effect of PPC structure is systematically analyzed. Finally，the reliability of the new structure is verified by field test. The research results indicate that the PPC structure can reinforcement the rockmass by grouting and forming a bearing structure. More importantly，the PPC structure can amplify support capacity. The PPC structure，it is important to adopt grout to improve the mechanical parameters of surrounding rockmass，but adjusting the row spacing between adjacent PPC to improve the bearing capacity of surrounding rock is more direct and efficient. Further analysis indicate that the reasonable thickness b1 of the shallow prestressed body is about 0.8 times of the tunnel radius r0，and the reasonable thickness b2 of the deep prestressed body is 1.44 times of tunnel radius，which can provide theoretical basis for the parameter design of the PPC. The field test shows that the prestressed pipe-cable support can effectively improve the stability of soft and broken surrounding rock，and can provide reference for similar projects.
[1] 陈湘生，徐志豪，包小华，等. 中国隧道建设面临的若干挑战与技术突破[J]. 中国公路学报，2020，33(12)：1–14.(CHEN Xiangsheng，XU Zhihao，BAO Xiaohua，et al. Challenges and technological breakthroughs in tunnel construction in China[J]. China Journal of Highway and Transport，2020，33(12)：1–14.(in Chinese))
[2] 张顶立. 隧道及地下工程的基本问题及其研究进展[J]. 力学学报，2017，49(1)：3–21.(ZHANG Dingli. Essential issues and their research progress in tunnel and underground engineering[J]. Chinese Journal of Theoretical and Applied Mechanics，2017，49(1)：3–21.(in Chinese))
[3] 李术才，徐 飞，李利平，等. 隧道工程大变形研究现状、问题与对策及新型支护体系应用介绍[J]. 岩石力学与工程学报，2016，35(7)：1 366–1 376.(LI Shucai，XU Fei，LI Liping，et al. State of the art：challenge and methods on large deformation in tunnel engineering and introduction of a new type supporting system[J]. Chinese Journal of Rock Mechanics and Engineering，2016，35(7)：1 366–1 376.(in Chinese))
[4] RABCEWICZ L V. New Austrian tunnelling method[M]. [S. l.]：[s. n.]，1960：453–457.
[5] 康永水，耿 志，刘泉声，等. 我国软岩大变形灾害控制技术与方法研究进展[J]. 岩土力学，2022，43(8)：2 035–2 059.(KANG Yongshui，GENG Zhi，LIU Quansheng，et al. Research progress on support technology and methods for soft rock with large deformation hazards in China[J]. Rock and Soil Mechanics，2022，43(8)：2 035–2 059.(in Chinese))
[6] LI C C. A new energy-absorbing bolt for rock support in high stress rock masses[J]. International Journal of Rock Mechanics and Mining Sciences，2010，47(3)：396–404.
[7] 赵兴东，朱乾坤，牛佳安，等. 一种新型J释能锚杆力学作用机制及其动力冲击实验研究[J]. 岩石力学与工程学报，2020，39(1)：13–21.(ZHAO Xingdong，ZHU Qiankun，NIU Jiaan，et al. Mechanical mechanism analyses and dynamic impact experimental tests of a kind of novel J energy-releasing bolts[J]. Chinese Journal of Rock Mechanics and Engineering，2020，39(1)：13–21.(in Chinese))
[8] VARDEN R，LACHENICHTR，PLAYER J，et al. Development and implementation of the garford dynamic bolt at the Kanowna Belle Mine[C]// The 10th Underground Operators' Conference. Launceston，Australia：[s. n.]，2008：19.
[9] HE M，GONG W，WANG J，et al. Development of a novel energy-absorbing bolt with extraordinarily large elongation and constant resistance[J]. International Journal of Rock Mechanics and Mining Sciences，2014，67：29–42.
[10] 董建华，秦兆贤，何鹏飞. 形状记忆合金式锚杆的提出及抗拔承载力特性分析[J]. 土木工程学报，2023，56(4)：103–118.(DONG Jianhua，QIN Zhaoxian，HE Pengfei. Analysis of working mechanism and mechanical characteristics of shape memory alloy anchor slope supporting structure[J]. China Civil Engineering Journal，2023，56(4)：103–118.(in Chinese))
[11] FREEMAN T J. The behaviour of fully-bonded rock bolts in the Kielder experimental tunnel[J]. Tunnels and Tunnelling，1978，10(5)：37–40.
[12] TAO Z，CHEN J X. Behavior of rock bolting as tunneling support[C]// Proceedings of the International Symposium on Rock Bolting. Rotterdam：Balkema，1984：87–92.
[13] STILLE H，HOLMBERY M，NORD G. Support of weak rock with grouted bolts and shotcrete[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1989，26(1)：99–113.
[14] 尤春安. 全长粘结式锚杆的受力分析[J]. 岩石力学与工程学报，2000，19(3)：339–341.(YOU Chun?an. Analysis of the force of full-length bond bolt[J]. Chinese Journal of Rock Mechanics and Engineering，2000，19(3)：339–341.(in Chinese))
[15] 姚显春，李 宁，陈蕴生. 隧洞中全长粘结式锚杆的受力分析[J]. 岩石力学与工程学报，2005，24(13)：2 272–2 276.(YAO Xianch，LI Ning，CHEN Yunsheng. Theoretical solution for shear stresses on interface of fully grouted bolt in tunnels[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(13)：2 272–2 276.(in Chinese))
[16] CAI Y，ESAKI T，JIANG Y J. An analytical model to predict axial load in grouted rock bolt for soft rock tunneling[J]. Tunneling and Underground Space Technology，2004，19：607–618.
[17] 方 勇，何 川. 全长黏结式锚杆与隧道围岩相互作用研究[J]. 工程力学，2007，24(6)：111–116.(FANG Yong，HE Chuan. Study on the interaction of whole bonded rock bolt and tunnel surrounding rock[J]. Engineering Mechanics，2007，24(6)：111–116.(in Chinese))
[18] BOBET A，EINSTEIN H H. Tunnel reinforcement with rockbolts[J]. Tunneling and Underground Space Technology，2011，26：100–123.
[19] 康红普，姜铁明，高富强. 预应力锚杆支护参数的设计[J]. 煤炭学报，2008，33(7)：721–726.(KANG Hongpu，JIANG Tieming，GAO Fuqiang. Design for pretensioned rock bolting parameters[J]. Journal of China Coal Society，2008，33(7)：721–726.(in Chinese))
[20] 康红普，姜鹏飞，蔡嘉芳. 锚杆支护应力场测试与分析[J].煤炭学报，2014，39(8)：1 521–1 529.(KANG Hongpu，JIANG Pengfei，CAI Jiafang. Test and analysis on stress fields caused by rock bolting[J]. Journal of China Coal Society，2014，39(8)：1 521–1 529.(in Chinese))
[21] 张顶立，孙振宇，侯艳娟. 隧道支护结构体系及其协同作用[J]. 力学学报，2019，51(2)：577–593.(ZHANG Dingli，SUN Zhenyu，HOU Yanjuan. Tunnel support structure system and its synergistic effect[J]. Chinese Journal of Theoretical and Applied Mechanics，2019，51(2)：577–593.(in Chinese))
[22] 文竞舟，杨春雷，粟海涛，等. 软弱破碎围岩隧道锚喷钢架联合支护的复合拱理论及应用研究[J]. 土木工程学报，2015，48(5)：1 15–122.(WEN Jingzhou，YANG Chunlei，SU Haitao，et al. Theoretical analysis and application of composite arch for bolt-shotcrete steel frame supported tunnel in weak and fractured rock mass[J]. China Civil Engineering Journal，2015，48(5)：115–122.(in Chinese))
[23] 赵光明，刘崇岩，孟祥瑞，等. 高应力巷道锚固复合承载体及其承载效应研究[J]. 采矿与安全工程学报，2021，38(1)：68–75.(ZHAO Guangming，LIU Chongyan，MENG Xiangrui，et al. The composite anchorage bearing structure in high stress roadway and its load-bearing effect[J]. Journal of Mining and Safety Engineering，2021，38(1)：68–75.(in Chinese))
[24] 余伟健，高 谦，朱川曲. 深部软弱围岩叠加拱承载体强度理论及应用研究[J]. 岩石力学与工程学报，2010，29(10)：2 134–2 142.(YU Weijian，GAO Qian，ZHU Chuanqu. Study of strength theory and application of overlap arch bearing body for deep soft surrounding rock[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(10)：2 134–2 142.(in Chinese)).
[25] LI C C. Principles of rockbolting design[J]. Journal of Rock Mechanics and Geotechnical Engineering，2017，9(3)：396–414.
[26] 赵东平，王卢伟，喻 渝，等. 隧道系统锚杆研究现状与发展方向[J]. 土木工程学报，2020，53(8)：116–128.(ZHAO Dongping，WANG Luwei，YU Yu，et al. Research status and development direction of tunnel system bolt[J]. China Civil Engineering Journal，2020，53(8)：116–128.(in Chinese))
[27] 侯公羽，梁金平，李小瑞. 常规条件下巷道支护设计的原理与方法研究[J]. 岩石力学与工程学报，2022，41(4)：691–711.(HOU Gongyu，LIANG Jinping，LI Xiaorui. Research on principles and methods of roadway support design under conventional conditions[J]，Chinese Journal of Rock Mechanics and Engineering，2022，41(4)：691–711.(in Chinese))
[28] EVERT H. Practical rock engineering[M]. [S. l.]：Evert Hoek Consulting Engineer Inc.，2007：313–314.
[29] 金解放，张 睿，王熙博，等. 岩石梯度应力加载试验装置研制及初步试验研究[J]. 岩石力学与工程学报，2020，39(8)：1 547–1 559. (JIN Jiefang，ZHANG Rui，WANG Xibo，et al. Development of a rock gradient stress loading test device and its primary application[J]. Chinese Journal of Rock Mechanics and Engineering，2020，39(8)：1 547–1 559.(in Chinese))
[30] 余 涛，方 勇，姚志刚，等. 隧道预应力锚杆锚固结构承载效应及围岩力学分析[J]. 岩土工程学报，2022，44(6)：1 069–1 077.(YU Tao，FANG Yong，YAO Zhigang，et al. Bearing effect of prestressed bolt-anchored structures and mechanical analysis of surrounding rock[J]. Chinese Journal of Geotechnical Engineering，2022，44(6)：1 069–1 077.(in Chinese))
2024, Vol. 43 
