【摘要】：針對(duì)目前關(guān)于位移釋放系數(shù)的計(jì)算方法比較復(fù)雜的問題,基于二次回歸正交組合試驗(yàn)設(shè)計(jì)方法,提出了位移釋放系數(shù)公式構(gòu)建方法,應(yīng)用該方法對(duì)靜水應(yīng)力場(chǎng)中圓形隧道進(jìn)行了一系列數(shù)值試驗(yàn),建立了考慮多個(gè)因素的開挖面位移釋放系數(shù)擬合公式,比較了各影響因素的敏感性大小.通過數(shù)值算例和工程實(shí)例分析,初步驗(yàn)證了該方法的有效性.研究結(jié)果表明:對(duì)于不同級(jí)別巖體,同一因素對(duì)開挖面位移釋放系數(shù)的影響程度不一;地應(yīng)力水平、巖體擾動(dòng)、地質(zhì)強(qiáng)度指標(biāo)、H-B常數(shù)和泊松比對(duì)開挖面位移釋放系數(shù)的影響較大,而巖石單軸抗壓強(qiáng)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(xué)土木工程學(xué)院;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(51578232,51378195)~~
【分類號(hào)】：U451.5
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本文編號(hào)：2439255