本文關(guān)鍵詞： 盾構(gòu)掘進(jìn) Kerr地基模型 縱向變形 剪切剛度　出處：《巖土力學(xué)》2014年09期 　論文類型：期刊論文

【摘要】：城市地鐵隧道施工中經(jīng)常遇到新建隧道下穿上方已建隧道的例子,如何提前預(yù)測已建隧道的縱向變形是目前工程界普遍關(guān)心的問題�；谀軌蚩紤]土體變形連續(xù)性的Kerr地基梁理論,分別將已建隧道簡化為歐拉伯努利梁和鐵木辛柯梁,將新建隧道對(duì)已建隧道的作用簡化為高斯分布荷載,建立了新建隧道施工對(duì)上方已建隧道影響的解析分析方法;并利用離心機(jī)試驗(yàn)結(jié)果進(jìn)行了驗(yàn)證。分析了地層損失率、荷載形狀參數(shù)和隧道與土體相對(duì)抗彎剛度對(duì)已建隧道縱向變形的影響。探討了隧道剪切剛度對(duì)隧道縱向變形的影響。研究發(fā)現(xiàn),當(dāng)隧道剪切剛度趨于無窮大時(shí),Kerr地基上的鐵木辛柯梁退化為歐拉伯努利梁;對(duì)于抗彎剛度較大的隧道(如抗彎剛度大于7.54×106kN·m2),Kerr地基梁具有較好的適用性;已建隧道的剪切剛度對(duì)其縱向變形何縱向曲率產(chǎn)生顯著影響;當(dāng)隧道等效剪切剛度有效系數(shù)≤1/4時(shí),必須考慮隧道剪切剛度對(duì)隧道縱向變形的影響。將所提分析方法應(yīng)用于上海盾構(gòu)隧道穿越工程中,并與現(xiàn)場實(shí)測結(jié)果進(jìn)行對(duì)比,驗(yàn)證了方法的合理性。
[Abstract]:In the construction of urban subway tunnels, there are often examples of newly built tunnels passing through the built tunnels above them. How to predict the longitudinal deformation of the tunnel in advance is a problem of general concern in the engineering field at present. Based on the theory of Kerr foundation beam which can consider the continuity of soil deformation, the existing tunnel is simplified into Euler Bernoulli beam and Temuxinco beam, respectively. The effect of newly built tunnel on built tunnel is simplified as Gao Si distributed load, the analytical analysis method of the influence of newly built tunnel construction on the upper tunnel is established, and the result of centrifuge test is used to verify, and the formation loss rate is analyzed. The effects of load shape parameters and the relative bending stiffness of tunnel and soil on the longitudinal deformation of the tunnel are discussed. The effects of shear stiffness on the longitudinal deformation of the tunnel are discussed. When the shear stiffness of the tunnel tends to infinity, the Temuxinko beam on the Kerr foundation degenerates into an Eulerian Bernoulli beam, which is suitable for the tunnel with higher flexural stiffness (such as the bending stiffness greater than 7.54 脳 10 ~ 6 KN 路m ~ 2 路m ~ (2)). The shear stiffness of the tunnel has a significant effect on the longitudinal curvature of the tunnel, and when the effective coefficient of the equivalent shear stiffness of the tunnel is 鈮，

本文編號(hào)：1530829