本文選題：圓形隧洞 + 圍巖　； 參考：《長江科學(xué)院院報》2017年09期

【摘要】：基于無限體中圓形隧洞的彈性解,結(jié)合卸荷擾動區(qū)與深部未擾動區(qū)的位移公式,推導(dǎo)洞室開挖卸荷區(qū)圍巖的等效彈性抗力系數(shù)表達(dá)式,并通過算例對比分析,驗證其合理性。研究結(jié)果表明:圍巖的等效彈性抗力系數(shù)與擾動區(qū)巖體彈性模量呈非線性關(guān)系,擾動區(qū)巖體質(zhì)量弱化,彈性模量降低,泊松比增大,擾動區(qū)圍巖的剛度和側(cè)向約束能力降低,圍巖的等效彈性抗力系數(shù)隨之減小;相同開挖半徑下,擾動區(qū)范圍的擴大直接降低圍巖承載能力,圍巖的彈性抗力系數(shù)減小;在擾動區(qū)厚度一定的情況下,開挖半徑越大,等效彈性抗力系數(shù)越小。說明隧洞圍巖穩(wěn)定是擾動區(qū)與深部未擾動圍巖共同作用的結(jié)果,僅采用擾動區(qū)巖體參數(shù)計算圍巖彈性抗力系數(shù)會過高地估算圍巖的分載能力,采用圍巖等效彈性抗力系數(shù)評價圍巖承載能力更加合理。
[Abstract]:Based on the elastic solution of circular tunnel in infinite body and the displacement formula of undisturbed zone and undisturbed zone in depth, the expression of equivalent elastic resistance coefficient of surrounding rock in unloading zone of excavation of cavern is derived, and its rationality is verified by comparison and analysis of numerical examples. The results show that the equivalent elastic resistance coefficient of the surrounding rock is nonlinear to the elastic modulus of the rock mass in the disturbed area, the mass of the rock mass in the disturbed area is weakened, the elastic modulus is decreased, the Poisson's ratio is increased, and the stiffness and lateral restraint ability of the surrounding rock in the disturbed area are decreased. Under the same excavation radius, the expansion of disturbance area directly reduces the bearing capacity of surrounding rock, and the elastic resistance coefficient of surrounding rock decreases. When the thickness of disturbance zone is constant, the excavation radius is larger. The equivalent elastic resistance coefficient is smaller. It shows that the stability of the surrounding rock is the result of the interaction between the disturbed zone and the deep undisturbed surrounding rock, and the calculation of the elastic resistance coefficient of surrounding rock mass by using the rock mass parameters in the disturbed area will be too high to estimate the load-splitting capacity of the surrounding rock. It is more reasonable to use the equivalent elastic resistance coefficient of surrounding rock to evaluate the bearing capacity of surrounding rock.
【作者單位】： 四川水利職業(yè)技術(shù)學(xué)院;四川大學(xué)水力學(xué)與山區(qū)河流開發(fā)保護國家重點實驗室;四川大學(xué)水利水電學(xué)院;
【基金】：國家重點基礎(chǔ)研究發(fā)展計劃(973計劃)項目(2015CB057903) 國家自然科學(xué)基金項目(51079092)
【分類號】：U451.2

【相似文獻(xiàn)】

相關(guān)期刊論文 前3條

1 方錢寶;馬建林;喻渝;楊建民;王新東;;大斷面黃土隧道圍巖彈性抗力系數(shù)、變形模量與壓縮模量試驗研究[J];巖石力學(xué)與工程學(xué)報;2009年S2期

2 王芝銀;袁鴻鵠;汪德云;張琦偉;;基于量測位移的隧洞圍巖彈性抗力系數(shù)反演方法[J];工程地質(zhì)學(xué)報;2013年01期

3 莊寶t，

本文編號：1894845