盾构隧道衬砌近接桥桩的施工力学响应及影响分析

发布时间：2018-05-12 01:25

本文选题：近接群桩 + 衬砌结构　；参考：《地下空间与工程学报》2016年S2期

【摘要】：衬砌结构作为盾构隧道主要承重结构,其受力特性直接决定隧道能否安全使用,运用有限元分析软件模拟不同注浆压力和不同近接距离下盾构隧道施工过程,分析衬砌结构近接桥桩的施工力学响应,结果表明:注浆压力在0.1MPa~0.5MPa范围内,随着注浆压力的增加衬砌管片的最大隆起值和最大沉降值均减小,水平最大正位移值与负位移值均增大,且管片的弯矩与剪力逐渐增大,轴力逐渐减小,其中水平位移与轴力的变化率较大;近接群桩距离的改变,衬砌管片的内力与变形均随着距离的增大而减小,逐渐接近于无桩时的状况,其中管片的沉降最大值与轴力的减少幅度较大。研究结果为类似工程提供参考。
[Abstract]:The lining structure is the main load-bearing structure of shield tunnel, and its mechanical characteristics directly determine whether the tunnel can be safely used. The finite element analysis software is used to simulate the construction process of shield tunnel under different grouting pressure and different close distance. The analysis of the construction mechanics response of the lining structure near bridge pile shows that the maximum uplift value and the maximum settlement value of the lining segment decrease with the increase of the grouting pressure in the range of 0.1MPa~0.5MPa. The maximum horizontal positive displacement and negative displacement increase, and the bending moment and shear force of the segment increase gradually, the axial force decreases gradually, and the change rate of horizontal displacement and axial force is larger. The internal force and deformation of lining segments decrease with the increase of distance, and are gradually close to the situation without piles, in which the maximum settlement of segments and the reduction of axial forces are larger. The results provide reference for similar projects.
【作者单位】：合肥工业大学土木与水利工程学院;湖北大禹水利水电建设有限责任公司;广州工业大学土木与交通工程学院;
【基金】：国家自然科学基金(51304057,51308164) 武汉城建科技计划项目(201620) 合肥市重点工程建设局科技支撑项目(2013CGAZ0771) 安徽省住房城乡建设厅科学技术计划项目(2013YF-27)
【分类号】：U455.43

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