【摘要】：盾構(gòu)隧道襯砌管片接頭處的力學(xué)性能極為復(fù)雜,采用局部剛度折減法并結(jié)合接頭張合狀態(tài)的力學(xué)模型進(jìn)行盾構(gòu)管片力學(xué)性能的數(shù)值模擬分析,研究襯砌管片及接頭縱向連接螺栓的受力及變形特性。研究結(jié)果表明:管片局部剛度折減后整體管片的豎向位移及大變形范圍均增大,管片水平位移變化量小,剛度折減區(qū)的水平位移略微減少,但影響整體管片內(nèi)力分布均勻性;基于管片接頭力學(xué)模型及變形協(xié)調(diào)原理,管片接頭縱向連接螺栓的變形及其變化規(guī)律與整體管片的基本相同,但變形量相對較小,且螺栓水平方向變形減少量高于豎直方向的;管片接頭縱向連接螺栓軸力基本為壓力,承受壓力的螺栓占全部螺栓的94.4%以上,彎矩及剪力值較小,其中彎矩沿隧道上下對稱分布,剪力沿隧道左右兩側(cè)對稱分布。本研究可為深入分析管片及接頭的力學(xué)性能提供參考與借鑒。
[Abstract]:The mechanical properties of the joint of shield tunnel lining segment are very complicated. The local stiffness reduction method and the mechanical model of joint tension state are used to simulate the mechanical properties of shield tunnel segment. The mechanical and deformation characteristics of lining segment and joint longitudinal connection bolt are studied. The results show that the vertical displacement and large deformation range of the whole segment increase after the reduction of the local stiffness of the segment, the horizontal displacement of the segment is small, the horizontal displacement of the stiffness reduction area is slightly reduced, but the uniformity of the internal force distribution of the whole segment is affected. Based on the mechanical model of segment joint and the principle of deformation coordination, the deformation and variation law of longitudinal joint bolt is basically the same as that of integral segment, but the deformation is relatively small, and the reduction of horizontal deformation of bolt is higher than that of vertical one. The axial force of longitudinal connection bolt of segment joint is basically pressure, the bolt bearing pressure accounts for more than 94.4% of all bolts, and the bending moment and shear force are smaller, in which the bending moment is symmetrically distributed along the tunnel top and bottom, and the shear force is symmetrically distributed along the left and right sides of the tunnel. This study can provide reference for further analysis of mechanical properties of segments and joints.
【作者單位】： 合肥工業(yè)大學(xué)土木與水利工程學(xué)院;中國礦業(yè)大學(xué)深部巖土力學(xué)與地下工程國家重點(diǎn)實(shí)驗(yàn)室;中南大學(xué)資源與安全工程學(xué)院;
【基金】：國家自然科學(xué)基金項(xiàng)目(51304057) 深部巖土力學(xué)與地下工程國家重點(diǎn)實(shí)驗(yàn)室開放研究基金項(xiàng)目(SKLGDUEK1406) 安徽省住房城鄉(xiāng)建設(shè)廳科學(xué)技術(shù)計(jì)劃項(xiàng)目(2013YF-27)
【分類號】：U455.43

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