铁路隧道穿越富水断层破碎带注浆形式与注浆圈参数优化
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石家庄铁道大学

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U455.4

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国家自然科学基金(青年科学“三维隧道空间有限元弹性波逆时偏移成像方法研究”项目号:纵20200042)


Research on the Optimization of Grouting Forms and Grouting Circle Parameters for Railway Tunnels Passing through Rich Water Fault Fractured Zone
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Shijiazhaungtiedao university

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    摘要:

    为解决隧道穿越富水断层破碎带施工时风险较大,极易发生围岩失稳、突涌水等问题。依托渝昆高铁小草坝隧道穿越富水断层破碎带为工程背景,通过采用FLAC3D建立流固耦合数值模型,研究了是否考虑地下水作用、不同注浆形式、注浆圈厚度和渗透系数下隧道围岩变形和支护结构受力的影响规律。结果表明:在考虑地下水作用下围岩稳定性较差,隧道开挖后,渗流达到稳态后地下水在隧道周边呈“漏斗状”分布,在超前注浆加固后,围岩稳定性增强,全周边注浆加固形式优于拱墙周边注浆。在选择注浆形式的基础上,对注浆圈参数继续优化,得出随着注浆圈厚度和渗透系数比的增大,可有效起到减小围岩位移、限制塑性区发展、降低初支孔隙水压力的作用,并且注浆圈厚度的增加可明显改变初支孔隙水压力的分布范围。综合优化比选,建议选择8 m的注浆圈厚度和注浆渗透系数比ng=100较为合适,经现场采用合适的注浆方案施工后,通过隧道周边监测值与模拟值对比,验证注浆方案的可行性和注浆参数选取的合理性,围岩稳定性得到有效控制。研究结果可以今后类似隧道工程设计、施工提供参考借鉴价值。

    Abstract:

    In order to solve the problem that the tunnel crosses the water-rich fault fracture zone, the construction risk is large, and the problems of surrounding rock instability and water inrush are very likely to occur. Based on the engineering background of the Xiaocaoba tunnel of the Chongqing-Kunming high-speed railway crossing the water-rich fault fracture zone, the fluid-structure interaction numerical model was established by using FLAC3D to study whether to consider the influence of groundwater action, different grouting forms, grouting ring thickness and the force of the supporting structure under the influence of groundwater. The results show that the stability of the surrounding rock is poor under the consideration of groundwater, and after the tunnel excavation, the groundwater is distributed in a "funnel-shaped" manner around the tunnel after the seepage reaches a steady state, and the stability of the surrounding rock is enhanced after the advanced grouting reinforcement, and the grouting reinforcement form of the whole perimeter is better than that of the grouting around the arch wall. On the basis of selecting the grouting form, the parameters of the grouting ring were continuously optimized, and it was concluded that with the increase of the ratio of grouting ring thickness and permeability coefficient, it can effectively reduce the displacement of surrounding rock, limit the development of plastic zone, and reduce the pore water pressure of the primary branch, and the increase of the thickness of the grouting ring can significantly change the distribution range of the pore water pressure of the primary branch. After the construction of the appropriate grouting scheme on site, the feasibility of the grouting scheme and the rationality of the selection of grouting parameters were verified by comparing the monitoring values around the tunnel with the simulated values, and the stability of the surrounding rock was effectively controlled. The research results can provide reference value for the design and construction of similar tunnel projects in the future.

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陈家征. 铁路隧道穿越富水断层破碎带注浆形式与注浆圈参数优化[J]. 科学技术与工程, , ():

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  • 收稿日期:2023-11-29
  • 最后修改日期:2024-07-01
  • 录用日期:2024-07-09
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