本文選題：縱向變形曲線　切入點(diǎn)：隧道　出處：《地下空間與工程學(xué)報(bào)》2017年S1期 　論文類(lèi)型：期刊論文

【摘要】：圍巖縱向變形曲線反映了開(kāi)挖面附近因隧道開(kāi)挖而引起的圍巖變形,目前最為常用的縱向變形曲線擬合公式并不能有效反映多種質(zhì)量圍巖的變形情況。針對(duì)該問(wèn)題,根據(jù)有限差分軟件FLAC3D建立了三維隧道開(kāi)挖模型,基于Hoek-Brown屈服準(zhǔn)則得出了不同工況理想彈塑性圍巖的縱向變形曲線,通過(guò)對(duì)數(shù)值模擬計(jì)算結(jié)果進(jìn)行非線性回歸分析,得到了修正的縱向變形曲線擬合公式,并探討了不同質(zhì)量圍巖條件下開(kāi)挖面附近的位移釋放率。結(jié)果表明:對(duì)于質(zhì)量較差的圍巖,在開(kāi)挖面后方,原有的擬合公式會(huì)在較大程度上高估位移釋放率,低估施加于支護(hù)上的荷載,相應(yīng)的支護(hù)設(shè)計(jì)偏不安全。
[Abstract]:The longitudinal deformation curve of surrounding rock reflects the deformation of surrounding rock caused by tunnel excavation in the vicinity of excavating surface. The most commonly used fitting formula of longitudinal deformation curve can not effectively reflect the deformation of surrounding rock with various mass. According to the finite difference software FLAC3D, the 3D tunnel excavation model is established. Based on the Hoek-Brown yield criterion, the longitudinal deformation curves of the ideal elastoplastic surrounding rock under different working conditions are obtained, and the nonlinear regression analysis is carried out on the results of the numerical simulation. A modified fitting formula of longitudinal deformation curve is obtained, and the displacement release rate near the excavation surface under different mass surrounding rock is discussed. The results show that: for the poor mass surrounding rock, behind the excavated surface, The original fitting formula overestimates the displacement release rate to a large extent, underestimates the load applied on the support, and the corresponding support design is not safe.
【作者單位】： 華中科技大學(xué)巖土與地下工程研究所;
【基金】：國(guó)家自然科學(xué)基金(51678267)
【分類(lèi)號(hào)】：U451.2

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本文編號(hào)：1597357