【摘要】：針對目前關于位移釋放系數的計算方法比較復雜的問題,基于二次回歸正交組合試驗設計方法,提出了位移釋放系數公式構建方法,應用該方法對靜水應力場中圓形隧道進行了一系列數值試驗,建立了考慮多個因素的開挖面位移釋放系數擬合公式,比較了各影響因素的敏感性大小.通過數值算例和工程實例分析,初步驗證了該方法的有效性.研究結果表明:對于不同級別巖體,同一因素對開挖面位移釋放系數的影響程度不一;地應力水平、巖體擾動、地質強度指標、H-B常數和泊松比對開挖面位移釋放系數的影響較大,而巖石單軸抗壓強度和變形模量影響較小.
[Abstract]:In view of the complicated calculation method of displacement release coefficient at present, based on quadratic regression orthogonal combination test design method, the formula construction method of displacement release coefficient is put forward. A series of numerical tests of circular tunnel in hydrostatic stress field are carried out by using this method. A fitting formula of displacement release coefficient of excavation surface considering several factors is established and the sensitivity of each influencing factor is compared. Numerical examples and engineering examples show the effectiveness of the proposed method. The results show that for different grades of rock mass, the influence of the same factor on displacement release coefficient of excavation surface is different. The in-situ stress level, rock mass disturbance, geological strength index, H _ (B) constant and Poisson's ratio have great influence on displacement release coefficient of excavation surface, while uniaxial compressive strength and deformation modulus of rock have little effect.
【作者單位】： 湖南大學土木工程學院;
【基金】：國家自然科學基金資助項目(51578232,51378195)~~
【分類號】：U451.5
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本文編號：2439255