铁路隧道管片衬砌承受高水压分界值研究

周济民; 何川; 张增

铁路隧道管片衬砌承受高水压分界值研究 English Version

周济民¹,
何川^1,,
张增^1,2

1. 西南交通大学地下工程系，四川成都 610031 ； 2. 中国中铁二院工程集团有限责任公司，四川成都 610031

基金项目: 国家自然科学基金项目(50925830)；国家“ 973 ”计划项目(2010CB732105)；中央高校基本科研业务费专项资金项目(2010XS03)

详细信息

作者简介:
周济民 (1984 – ) ，男，河北唐山人，西南交通大学在读博士，主要从事隧道与地下工程研究。

中图分类号: U45
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出版历程
- 发布日期: 2011-10-14

Boundary value of high hydraulic pressure upon segment lining in railway tunnels

1. Dept. of Tunnel and Underground Engineering, Southwest Jiaotong University, Chengdu 610031, China; 2. China Railway Eryuan Engineering Group Co., Ltd., Chengdu 610031, China

摘要

摘要: 铁路隧道一般位于山岭或水下的复杂地质环境中，面临着地下水的威胁，国内工程界对于管片衬砌所能承受的高水压一直没有明确的分界值。针对管片衬砌结构型式的特点，从接缝防水及结构受压承载能力两方面对高水压分界值展开研究。提出了管片衬砌结构高水压限界的定义及判定方法，求解了不同围岩级别、不同管片设计参数（混凝土强度等级、厚度）条件下的管片衬砌高水压承载能力。最后通过大比例尺模型试验对衬砌受水压作用的力学特征进行分析。研究结果表明：管片接缝在允许的张开量和错位量的前提下，同时考虑设计材料的应力松弛与老化，密封垫设计承受的最大水压能力约在 0.8 ～ 1.0 MPa 之间；管片环不同位置处的受压承载能力安全系数近似呈正弦曲线分布，拱顶及拱底位置为衬砌结构受力控制点，提高混凝土强度等级或加大管片厚度可以显著增加管片衬砌的受压承载能力；高水压条件下结构呈受压破坏，低水压条件下呈受拉破坏，一定范围内提升管片的外水压力，衬砌结构的轴力值增加明显，弯矩值变化幅度不大，对于结构受力是有利的。
- 铁路隧道 /
- 管片衬砌 /
- 高水压分界值 /
- 接缝防水 /
- 模型试验
Abstract: Railway tunnels mostly under complicated geological environment of mountains or rivers have been threatened with groundwater. So far there has been no clear boundary value of water level in the field of tunnel engineering. In response to the characteristics of lining structure, both aspects of joint water-proof and lining bearing capacity are studied. A decision method about press loading capability of lining structure is put forward, with different design parameters of surrounding rock level, concrete grade and thickness of lining. Large-scale similar model tests are performed to study the mechanical characteristics under water pressure. The study shows that according to the technical requirement of joint open and dislocation, taking into account stress relaxation and aging of the materials, the designed capacity for water pressure of sealing gasket is about 0.8~1.0 MPa. The waveform of structural safety coefficients at different positions of segment lining resembles a sine curve, and the crown and bottom of the tunnel are load control points. The boundary value of high hydraulic pressure can be obviously increased by improving concrete grade and thickness of lining. The failure mode of segment lining under high water pressure is owing to compression , on the contrary, it is due to tension. The axial force is improved significantly and the bending moment is little changed with the increase of water pressure in certain range, which is favorable to lining structure.
- railway tunnel /
- segment lining /
- boundary value of high hydraulic pressure /
- joint water-proof /
- model test

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参考文献(16)

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