隧道衬砌水压力计算与控制方法探讨

发布时间：2019-04-19 16:13

【摘要】：研究目的:在长期运营过程中,因各种原因,隧道排水系统会逐步堵塞,二次衬砌也会逐步承受水压力作用。现有衬砌水压力的计算方法是基于横断面二维模型得出的,有必要基于防排水系统的空间效应,研究衬砌水压力的纵向分布特征及最大水压力控制方法。研究结论:(1)按现有横断面二维模型计算得到的结构水压力,考虑防排水系统的空间效应后会形成水压力重分布;(2)堵塞段二次衬砌最大水压力大致与地下水"余量"及堵塞段长度的平方成正比,与排水层的总面积及其渗透系数的乘积成反比;(3)建议二次衬砌水压力荷载取值:对于山岭隧道,当排水量小或维护作业难度小时可以不考虑水压力,否则宜控制在0.05~0.15 MPa以内;对于水下隧道,公路隧道宜控制在0.2~0.3 MPa以内,铁路隧道或地铁隧道宜控制在0.4~0.6 MPa以内;(4)在隧道内每间隔一定距离设置"泄压环"可以有效控制结构的最大水压力;(5)本研究结果可为隧道衬砌最大水压力取值与控制提供思路和方法。
[Abstract]:Research purpose: during the long-term operation, the tunnel drainage system will be blocked gradually and the secondary lining will be gradually subjected to the effect of water pressure due to various reasons. The existing calculation methods of water pressure of lining are based on the two-dimensional model of cross-section. It is necessary to study the longitudinal distribution characteristics of water pressure of lining and the control method of maximum water pressure based on the spatial effect of waterproofing and drainage system. The conclusions are as follows: (1) according to the two-dimensional model of the existing cross-section, the redistribution of water pressure will be formed after considering the spatial effect of the water-prevention and drainage system; (2) the maximum water pressure of the secondary lining in the blocking section is in direct proportion to the groundwater "surplus" and the square of the length of the blocked section, and is inversely proportional to the product of the total area of the drainage layer and its permeability coefficient; (3) the value of water pressure load of secondary lining is suggested: for mountain tunnel, when the displacement is small or the difficulty of maintenance operation is small, the water pressure can not be considered, otherwise, it should be controlled within 0.05 ~ 0.15 MPa; For underwater tunnel, the highway tunnel should be controlled within 0.2 ~ 0.3 MPa, the railway tunnel or subway tunnel should be controlled within 0.4 ~ 0.6 MPa; (4) the maximum water pressure of the tunnel can be effectively controlled by setting a "pressure relief ring" at each interval, and (5) the results of this study can provide ideas and methods for the determination and control of the maximum water pressure of the tunnel lining.
【作者单位】：中铁第四勘察设计院集团有限公司水下隧道技术湖北省工程实验室;
【分类号】：U451.4

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