堆积体隧道围岩及支衬体系空间力学特性

发布时间：2018-05-28 00:13

本文选题：堆积体隧道 + 围岩应力　；参考：《公路》2017年02期

【摘要】：为研究堆积体隧道围岩和支衬体系受力空间变化规律,采用三维弹塑性有限元法模拟隧道施工过程,得到了洞室周边围岩和支护结构应力随掌子面开挖的变化过程。结果表明,隧道开挖对不同部位围岩扰动大小存在较大差异,扰动后拱部围岩应力强度较小,拱脚和边墙围岩应力强度最大,仰拱围岩应力波动较大但量值总体偏小;管棚在隧道开挖前后受力状态发生明显改变,支护和衬砌过程中有微小波动;拱部系统锚杆对于维持围岩临时稳定发挥了一定作用,但其作为永久支护对围岩长期稳定作用不大,锁脚锚杆在下台阶开挖以及隧道长期稳定方面均发挥了重要作用;初支拱部受拉、边墙和拱脚受压显著,其中拱腰、拱脚分别为拉、压控制性截面;与钢筋混凝土强度相比,二衬受力较小,具有较大的强度储备。
[Abstract]:In order to study the spatial variation law of surrounding rock and lining system of accumulative tunnel, the process of tunnel construction was simulated by using three-dimensional elastic-plastic finite element method, and the stress variation process of surrounding rock and supporting structure around the tunnel with the excavation of face was obtained. The results show that there are great differences in disturbance between different parts of surrounding rock in tunnel excavation. The stress intensity of arched wall rock is smaller, the stress intensity of arch foot and side wall rock is the largest, and the stress fluctuation of inversed wall rock is larger, but the value of value is generally small. The stress state of the pipe shed changes obviously before and after the tunnel excavation, and there are slight fluctuations in the process of supporting and lining, and the arch system bolt plays a certain role in maintaining the temporary stability of surrounding rock. However, as permanent support, it has little effect on the long-term stability of surrounding rock, locking bolt plays an important role in the excavation of lower steps and the long-term stability of tunnel. Compared with the strength of reinforced concrete, the second lining has less stress and has a large strength reserve.
【作者单位】：长安大学公路学院;
【基金】：陕西省工业科技攻关项目,项目编号2015GY185 中央高校基本科研业务费专项资金,项目编号31082116011 陕西省科技厅社会发展科技攻关项目,项目编号2016SF-412
【分类号】：U451.2

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