开挖扰动及非达西渗流对隧道涌水的影响分析

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摘要 研究目的: 隧道开挖扰动对渗透系数的改变及扰动区的非达西渗流是影响隧道涌水预测精度的重要因素,为提高涌水预测精度,构建含扰动区的隧道涌水简化计算模型,基于地下水力学理论、非达西定律及线性叠加原理推导涌水量及结构外水压力计算表达式,并进行退化分析,后对特征参数进行敏感性研究,最后通过与现场实测数据对比检验构建模型的合理性及公式推导的正确性。
研究结论: (1)扰动区厚度及渗透系数的增加,减弱了围岩的阻水能力,导致隧道涌水量增加,提高施工技术水平,降低扰动程度与扰动范围可减弱扰动区围岩渗透系数的变异性,对隧道运营期阻水有积极作用;(2)适当提高注浆圈的抗渗性能可有效降低隧道涌水量,但随注浆圈抗渗性能的增加,对隧道涌水量降低的作用逐渐趋于平缓;(3)考虑扰动区对围岩渗透系数的改变及非达西渗流影响时,涌水量预测误差可由8.9%降低为4.2%;(4)本研究成果可为考虑开挖扰动对隧道涌水影响的研究提供理论指导。

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	傅鹤林
	安鹏涛
	伍毅敏
	成国文

关键词 ：开挖扰动, 非达西定律, 反映法, 涌水量预测

Abstract：Research purposes: The change of permeability coefficient caused by tunnel excavation disturbance and Non-Darcy seepage in the disturbed area are important factors affecting the prediction accuracy of tunnel water inrush. In order to improve the prediction accuracy of water inrush, a simplified calculation model of tunnel water inrush in the disturbed area is constructed. The calculation expressions of water inrush and external water pressure of the structure are deduced based on the theory of underground hydraulics, Non-Darcy's law and linear superposition principle, and the degradation analysis is carried out. After that, the sensitivity of characteristic parameters is studied. Finally, the rationality of the model and the correctness of formula derivation are tested by comparing with the field measured data.
Research conclusions: (1) The increase of the thickness and permeability coefficient of the disturbed area weakens the water blocking capacity of the surrounding rock, resulting in the increase of the water inflow of the tunnel. Improving the construction technology level and reducing the degree and scope of disturbance can weaken the variability of the permeability coefficient of the surrounding rock in the disturbed area, which has a positive effect on the water blocking during the operation period of the tunnel. (2) Properly improving the impermeability of the grouting ring can effectively reduce the water inflow of the tunnel, but with the increase of the impermeability of the grouting ring, the effect on the reduction of the water inflow of the tunnel tends to be gradual. (3) Considering the change of permeability coefficient of surrounding rock in disturbed area and the influence of Non-Darcy's seepage, the prediction error of water inflow can be reduced from 8.9% to 4.2%. (4) The research results can provide theoretical guidance for considering the influence of excavation disturbance on tunnel water inflow.

Key words： excavation disturbance Non-Darcy's law reflection method prediction of water inflow

收稿日期: 2021-09-24

PACS:

U459.2

基金资助:国家自然科学基金面上项目(51978668);广东省交通运输厅课题(DFH(201904)YS1-001)

作者简介: ^**傅鹤林,1965年出生,男,教授,博士生导师。

引用本文:

傅鹤林, 安鹏涛, 伍毅敏, 成国文. 开挖扰动及非达西渗流对隧道涌水的影响分析[J]. 铁道工程学报, 2022, 39(7): 80-85.
FU Helin, AN Pengtao, WU Yimin, CHENG Guowen. Analysis of the Influence of Excavation Disturbance and Non-Darcy Seepage on Tunnel Water Inflow. Journal of Railway Engineering Society, 2022, 39(7): 80-85.

链接本文:

https://tdgcxb.crec.cn/CN/ 或 https://tdgcxb.crec.cn/CN/Y2022/V39/I7/80

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