高压水工隧洞透水衬砌设计与优化方法

doi:10.13722/j.cnki.jrme.2016.0510

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摘要

基于隧洞透水衬砌设计方法，探讨隧洞运行期衬砌最大裂缝宽度和等效渗透系数的演化规律。分析衬砌配筋率、衬砌厚度和围岩渗透特性对衬砌安全性的影响，借助多元统计逐步回归的方法提出透水衬砌的设计优化方法。计算结果表明：高压隧洞在运行期衬砌围岩脱离之前，衬砌最大裂缝宽度和等效渗透系数随内水压力增大的增幅较快，而在脱离后增幅明显减小；衬砌最大裂缝宽度与配筋率成反比，与围岩渗透系数的对数值成正比；在衬砌限裂的优化设计过程中，建议以降低围岩的渗透特性为先导，提高围岩的综合抗渗能力，其次提高衬砌配筋率减小最大裂缝宽度，而增加衬砌厚度作为优化设计的辅助手段；衬砌配筋率的绝对值每提高0.1%，衬砌最大裂缝宽度减小约0.02 mm；围岩渗透系数每降低10倍，衬砌最大裂缝宽度减小约0.10 mm。

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	李腾1
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	苏凯1
	张智敏1
	伍鹤皋1

关键词 ：水利工程, 水工隧洞, 透水衬砌, 限裂, 优化方法

Abstract：Based on the design guide of pervious lining tunnel, this study discussed the dynamic discipline of maximum crack widths and equivalent permeability coefficient in the operating period. The influence caused by reinforcement ratio，thickness of lining and permeability of rock was investigated from the perspective of the design of the crack limitation. Then a kind of optimum design method was promoted by using multivariate statistical stepwise regression. It turns out that the increase of maximum crack widths and equivalent permeability coefficient was much larger when the rock and lining are contacted than when they were detached. In addition, the maximum crack widths were inversely proportional to the reinforcement ratio，while proportional to the logarithm of permeability of rock. As the result，it is recommended that the reduction of permeability of rock should be conducted firstly to improve the impervious capacity. Then，it is also necessary to increase the reinforcement ratio with making the augment of thickness of lining as an aided method. There is an approximate 0.02 mm decrease in maximum crack widths when existing every 0.1% increase in the reinforcement ratio. Meanwhile，the decreased of the reinforcement ratio was about 0.10 mm when the permeability coefficient of rock was reduced by 10 times.

Key words： hydraulic engineering hydraulic tunnel permeable lining crack limitation optimization method

引用本文:

李腾1，2，苏凯1，张智敏1，伍鹤皋1. 高压水工隧洞透水衬砌设计与优化方法[J]. 岩石力学与工程学报, 2017, 36(S2): 4047-4053.
LI Teng1，2，SU Kai1，ZHANG Zhimin1，WU Hegao1. Optimization and design method for permeable lining of high pressure hydraulic tunnel. , 2017, 36(S2): 4047-4053.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2016.0510 或 https://rockmech.whrsm.ac.cn/CN/Y2017/V36/IS2/4047

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