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| 软弱围岩隧道取消系统锚杆的现场试验研究 | |
| 引用本文： | 陈建勋,杨善胜,罗彦斌,王梦恕.软弱围岩隧道取消系统锚杆的现场试验研究[J].岩土力学,2011,32(1):15-20. |
| 作者姓名： | 陈建勋 杨善胜 罗彦斌 王梦恕 |
| 作者单位： | 1. 长安大学,桥梁与隧道陕西省重点实验室,西安,710064 2. 陕西西延铁路有限责任公司,西安,710054 3. 北京交通大学,土木建筑工程学院,北京,100044 |
| 基金项目： | 国家西部交通建设科技项目（No. 200831800059）。 |
| 摘 要： | 在软弱围岩隧道中，提出初期支护结构由钢架+喷射混凝土+钢筋网+锁脚锚杆+纵向连接筋组成，即取消系统锚杆用钢架联结处的锁脚锚杆代替。以包家山隧道为依托工程，采用现场试验的方法，选取2个试验段，进行锁脚锚杆取代系统锚杆后，有、无拱部锚杆的对比试验研究。对比试验的内容包括：隧道初期支护的净空收敛、围岩压力、钢架应力、喷射混凝土应力、锚杆轴力和纵向连接筋应力等。研究结果表明：2个试验段初期支护变形趋于稳定，结构受力安全，说明取消系统锚杆不影响初期支护结构的安全与稳定；拱部锚杆有受拉，也有受压，但受力都不大，最大拉应力仅为钢材极限强度的11.8%，其支护作用不明显；锁脚锚杆大部分受拉，最大值达到191 MPa，钢架支护作用明显，在支护体系中发挥着重要作用。取消系统锚杆减少了施工工序，降低了工程造价，缩短了工序循环时间，有利于及早封闭围岩以形成完整的支护结构。经济价值和社会效益显著。 |
| 关 键 词： | 隧道工程 软弱围岩 系统锚杆 锁脚锚杆 现场试验 |
| 收稿时间： | 2009-11-15 |
Field test research on elimination of systematic rock bolts in weak rock tunnel |
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| CHEN Jian-xun,YANG Shan-sheng,LUO Yan-bin,WANG Meng-shu.Field test research on elimination of systematic rock bolts in weak rock tunnel[J].Rock and Soil Mechanics,2011,32(1):15-20. | |
| Authors: | CHEN Jian-xun YANG Shan-sheng LUO Yan-bin WANG Meng-shu |
| Institution: | 1. Key Laboratory for Bridge and Tunnel of Shaanxi Province, Chang’an University, Xi’an 710064, China; 2. Shaanxi Xiyan Railway Co. Ltd., Xi’an 710054, China; 3. School of Civil Engineering and Architecture, Beijing Jiaotong University, Beijing 100044, China |
| Abstract: | In weak rock tunnel, elimination of systematic rock bolts is advanced, and the primary support structure is the combination of steel arch, shotcrete, reinforcing mesh, feet-lock rock bolt and longitudinal link steel bar. This paper is based on Baojiashan tunnel. Two test sections are chosen and field test is carried out. With systematic rock bolts replaced by feet-lock rock bolts, two models of systematic rock bolts and non-systematic rock bolts are established and analyzed comparatively. The content of comparative tests includes: the clearance convergence of tunnel primary support, surrounding rock pressure, steel arch stress, shotcrete stress, axial force of rock bolt and longitudinal link steel bar stress. The result shows that the deformation of primary support in the two test sections tends stable and the structure is safe, which shows that the elimination of systematic rock bolts does not affect the security and stability of primary support; some rock bolts in the arch part are subjected to tension; and some are subjected to compression; but the force is minor, and the maximum tensile stress is only 11.8% of ultimate strength of steel, so the support action of rock bolts in the arch part is not obvious; most feet-lock rock bolts are subjected to tension, and the maximum tensile stress is up to 191 MPa, so the feet-lock rock bolts play an important role in the support system. The elimination of systematic rock bolts will reduce construction process, lower engineering cost and shorten procedure cycle time, which is conductive to an early closure of surrounding rock to form a complete supporting structure. It will get a significant economic value and social benefits. |
| Keywords: | tunnel engineering weak surrounding rock systematic rock bolts feet-lock rock bolt field test |
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