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| Research on the evaluation method of the hydraulic pressure on tunnel lining according to the range of seepage field |
| YU Li1，2，FANG Lin1，2，DONG Yucang1，2，WANG Mingnian1，2 |
| (1. School of Civil Engineering，Southwest Jiaotong University，Chengdu，Sichuan 610031，China；2. Key Laboratory of Transportation Tunnel Engineering，Ministry of Education，Southwest Jiaotong University，Chengdu，Sichuan 610031，China) |
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Abstract With the large testing system for tunnel seepage，experiments were carried out to analyze the influence of the rock permeability coefficient，the initial height of water head and the rates of drainage on the distribution of seepage field in surrounding rock and the water pressure on lining. The calculation formulas for the influencing range of seepage field and water pressure of lining were presented. The obtained results were verified by numerical simulation. The influencing range of seepage field is affected by the permeability coefficient of surrounding rock，the initial height of water head and the rate of tunnel drainage. The analysis of the correlation between the above factors and the influencing range of seepage field by the single variable method proves that the greater the permeability coefficient and the rate of tunnel drainage，the larger the influencing range of seepage field. The effect of permeability coefficient on the influencing range of seepage field is greater than that of the rate of tunnel drainage. There is a linear positive correlation between the influencing range of seepage field and the initial height of water head. The influencing range of seepage field coefficient is related to the rate of tunnel drainage and permeability coefficient，but has nothing to do with the initial height of water head. The influence range of seepage field coefficient，the rate of tunnel drainage and permeability coefficient satisfy the quadratic surface equation. The average water pressure on lining，the influencing range of seepage field and the rate of tunnel drainage also satisfy the quadratic surface equation. The calculation formula for the average water pressure was obtained. The above formulas are in good agreement with the numerical results.
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2018, Vol. 37 
