【摘要】：基于隧洞透水襯砌設計方法,探討隧洞運行期襯砌最大裂縫寬度和等效滲透系數(shù)的演化規(guī)律。分析襯砌配筋率、襯砌厚度和圍巖滲透特性對襯砌安全性的影響,借助多元統(tǒng)計逐步回歸的方法提出透水襯砌的設計優(yōu)化方法。計算結(jié)果表明:高壓隧洞在運行期襯砌圍巖脫離之前,襯砌最大裂縫寬度和等效滲透系數(shù)隨內(nèi)水壓力增大的增幅較快,而在脫離后增幅明顯減小;襯砌最大裂縫寬度與配筋率成反比,與圍巖滲透系數(shù)的對數(shù)值成正比;在襯砌限裂的優(yōu)化設計過程中,建議以降低圍巖的滲透特性為先導,提高圍巖的綜合抗?jié)B能力,其次提高襯砌配筋率減小最大裂縫寬度,而增加襯砌厚度作為優(yōu)化設計的輔助手段;襯砌配筋率的絕對值每提高0.1%,襯砌最大裂縫寬度減小約0.02 mm;圍巖滲透系數(shù)每降低10倍,襯砌最大裂縫寬度減小約0.10 mm。
[Abstract]:Based on the design method of tunnel permeable lining, the evolution law of maximum crack width and equivalent permeability coefficient of tunnel lining during operation is discussed. The influence of lining reinforcement ratio, lining thickness and seepage characteristics of surrounding rock on lining safety is analyzed, and the design optimization method of permeable lining is put forward by means of multivariate statistical stepwise regression method. The calculation results show that the maximum crack width and equivalent permeability coefficient of high pressure tunnel increase rapidly with the increase of internal water pressure, but decrease obviously after separation before the surrounding rock of high pressure tunnel is separated from the surrounding rock during operation. The maximum crack width of the lining is inversely proportional to the reinforcement ratio and proportional to the logarithmic value of the permeability coefficient of the surrounding rock. In the process of optimal design of lining crack limitation, it is suggested that the comprehensive impermeability of surrounding rock should be improved by reducing the seepage characteristics of surrounding rock, and secondly, the reinforcement ratio of lining should be increased to reduce the maximum crack width. Increasing the thickness of lining is used as an auxiliary means to optimize the design. When the absolute value of lining reinforcement ratio is increased by 0.1%, the maximum crack width of lining decreases by about 0.02 mm;, and the permeability coefficient of surrounding rock decreases by 10 times, and the maximum crack width of lining decreases by about 0.10 mm..
【作者單位】： 武漢大學水資源與水電工程科學國家重點實驗室;武漢地鐵集團有限公司;
【基金】：國家自然科學基金資助項目(51179140,51579194)~~
【分類號】：TV554

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